6-K

FORM 6-K

U.S. SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE

SECURITIES EXCHANGE ACT OF 1934

Dated November 7, 2018

Commission File Number 1-14878

GERDAU S.A.

(Exact Name as Specified in its Charter)

N/A

(Translation of Registrant’s Name)

Av. das Nações Unidas, 8,501 – 8° andar

São Paulo, São Paulo - Brazil CEP 05425-070

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F x       Form 40-F o

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): o

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): o

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes o       No x

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):  Not applicable.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused the Report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date:  November 7, 2018

GERDAU S.A.
By:	/s/ Harley Lorentz Scardoelli
Name:	Harley Lorentz Scardoelli
Title:	Investor Relations Director

2

EXHIBIT INDEX

Exhibit	Description of Exhibit
99.1	Quarterly Results 3Q18, Gerdau S.A. and subsidiaries, November 7, 2018

3

EX-99.1

Exhibit 99.1

Highlights in the Third Quarter of 2018

Consolidated Highlights

·EBITDA of R$ 2,013 million in 3Q18, the highest quarterly result since 2008, with EBITDA margin of 15.7%.

·Disciplined reduction in selling, general and administrative expenses in 3Q18, to 3.3% of net sales, the lowest level ever.

·Financial leverage measured by the net debt/adjusted EBITDA ratio fell to 2.2x as of September 30, 2018, the lowest ratio since 2012.

·Adjusted net income of R$ 998 million in 3Q18, the best result since 2008, with the distribution of R$ 221 million in dividends.

EBITDA (R$ million) and EBITDA Margin (%)	SG&A Expenses (R$ million and % of Net Sales)
Debt (R$ billion) & Leverage Ratio	Adjusted Net Income (R$ million)

*Net of effects from net investment hedge.

1

Consolidated Information

Gerdau’s performance in the third quarter of 2018

The Consolidated Financial Statements of Gerdau S.A. are presented in accordance with the International Financial Reporting Standards (IFRS) and the accounting practices adopted in Brazil, which are fully aligned with the accounting standards issued by the Accounting Pronouncements Committee (CPC).

The information in this report does not include data of associates and jointly controlled entities, except where stated otherwise.

Results of Operations

Consolidated	3rd Quarter 2018		3rd Quarter 2017		Variation 3Q18/3Q17		2nd Quarter 2018		Variation 3Q18/2Q18		9 months 2018		9 months 2017		Variation 9M18/9M17
Volumes (1,000 tonnes)
Production of crude steel	3,969		4,062		-2.3	%	3,989		-0.5	%	12,122		12,171		-0.4	%
Shipments of steel	3,688		3,865		-4.6	%	3,834		-3.8	%	11,394		11,163		2.1	%
Results (R$ million)
Net Sales	12,836		9,476		35.5	%	12,035		6.7	%	35,260		27,101		30.1	%
Cost of Goods Sold	(10,974	)	(8,502	)	29.1	%	(10,391	)	5.6	%	(30,414	)	(24,536	)	24.0	%
Gross profit	1,862		974		91.2	%	1,644		13.3	%	4,846		2,565		88.9	%
Gross margin (%)	14.5	%	10.3	%			13.7	%			13.7	%	9.5	%
SG&A	(418	)	(397	)	5.3	%	(431	)	-3.0	%	(1,269	)	(1,257	)	1.0	%
Selling expenses	(141	)	(131	)	7.6	%	(158	)	-10.8	%	(449	)	(403	)	11.4	%
General and administrative expenses	(277	)	(266	)	4.1	%	(273	)	1.5	%	(820	)	(854	)	-4.0	%
Adjusted EBITDA	2,013		1,166		72.6	%	1,756		14.6	%	5,253		3,140		67.3	%
Adjusted EBITDA Margin	15.7	%	12.3	%			14.6	%			14.9	%	11.6	%

Production and shipments

·Consolidated crude steel production and shipments decreased in 3Q18 in relation to 3Q17, mainly due to the lower production and shipments in the Brazil BD resulting from the scheduled maintenance shutdown of Blast Furnace 2 in Ouro Branco, MG, and in the South America BD resulting from the deconsolidation of Chile as from July 2018.

Operating result

·In 3Q18, consolidated net sales increased in relation to both 3Q17 and 2Q18, due to the higher net sales per tonne at all BDs, influenced primarily by the higher international prices.

·Consolidated cost of goods sold increased compared to both 3Q17 and 2Q18, reflecting the higher raw material costs in general.

·Consolidated gross profit increased significantly in relation to 3Q17, supported by the better performance of the Brazil and North America BDs. Meanwhile, gross margin expanded, supported by the increase in net sales per tonne sold, which more than offset the increase in cost per tonne sold.

·Selling, general and administrative expenses in 3Q18 fell to their lowest level ever, to 3.3% of net sales, which reflects the ongoing efforts to streamline operations and to implement the digital innovation, as well as the higher net sales in the period.

2

Breakdown of Consolidated EBITDA (R$ million)	3rd Quarter 2018		3rd Quarter 2017		Variation 3Q18/3Q17		2nd Quarter 2018		Variation 3Q18/2Q18		9 months 2018		9 months 2017		Variation 9M18/9M17
Net income	791		145		445.5	%	698		13.3	%	1,937		1,044		85.5	%
Net financial result	441		254		73.6	%	713		-38.1	%	1,498		705		112.5	%
Provision for income and social contribution taxes	39		181		-78.5	%	(231	)	—		(20	)	518		—
Depreciation and amortization	478		515		-7.2	%	457		4.6	%	1,388		1,569		-11.5	%
EBITDA - Instruction CVM (1)	1,749		1,095		59.7	%	1,637		6.8	%	4,803		3,836		25.2	%
Gains and losses on assets held for sale and sales os interest in subsidiaries	177		—		—		48		268.8	%	229		72		218.1	%
Equity in earnings of unconsolidated companies	3		29		-89.7	%	(24	)	—		(39	)	32		—
Proportional EBITDA of associated companies and jointly controlled entities	84		42		100.0	%	95		-11.6	%	260		130		100.0	%
Reversal of contingent liabilities, net	—		—		—		—		—		—		(930	)	—
Adjusted EBITDA(2)	2,013		1,166		72.6	%	1,756		14.6	%	5,253		3,140		67.3	%
Adjusted EBITDA Margin	15.7	%	12.3	%			14.6	%			14.9	%	11.6	%

(1) - Non-accounting measurement calculated pursuant to Instruction 527 of the CVM.

(2) - Non-accounting mesurement prepared by the Company.

Note: EBITDA (Earnings Before Interest, Taxes, Depreciation and Amortization) is not a method used in accounting practices, does not represent cash flow for the periods in question and should not be considered an alternative to cash flow as an indicator of liquidity.

The Company presents adjusted EBITDA to provide additional information regarding cash flow generation in the period.

Conciliation of Consolidated EBITDA (R$ million)	3rd Quarter 2018		3rd Quarter 2017		2nd Quarter 2018		9 months 2018		9 months 2017
EBITDA - Instruction CVM (1)	1,749		1,095		1,637		4,803		3,836
Depreciation and amortization	(478	)	(515	)	(457	)	(1,388	)	(1,569	)
OPERATING INCOME BEFORE FINANCIAL RESULT AND TAXES(2)	1,271		580		1,180		3,415		2,267

(1) - Non-accounting measure calculated pursuant to Instruction 527 of the CVM.

(2) - Accounting measurement disclosed in consolidated Statements of Income.

·Adjusted EBITDA and adjusted EBITDA margin increased in 3Q18 compared to 3Q17, accompanying the performance of gross profit and gross margin, led by the performances of the Brazil and North America BDs, and marking the highest quarterly EBITDA since 2008.

Financial result and net income

Consolidated (R$ million)	3rd Quarter 2018		3rd Quarter 2017		Variation 3Q18/3Q17		2nd Quarter 2018		Variation 3Q18/2Q18		9 months 2018		9 months 2017		Variation 9M18/9M17
Income before financial income expenses and taxes(1)	1,271		580		119.1	%	1,180		7.7	%	3,415		2,267		50.6	%
Financial Result	(441	)	(254	)	73.6	%	(713	)	-38.1	%	(1,498	)	(705	)	112.5	%
Financial income	57		53		7.5	%	34		67.6	%	123		179		-31.3	%
Financial expenses	(401	)	(410	)	-2.2	%	(387	)	3.6	%	(1,155	)	(1,327	)	-13.0	%
Exchange variation, net (including net investment hedge)	(114	)	102		—		(388	)	-70.6	%	(510	)	81		—
Reversal of monetary update of contingent liabilities, net	—		—		—		—		—		—		370		—
Gains (losses) on financial instruments, net	17		1		—		28		-39.3	%	44		(8	)	—
Income before taxes(1)	830		326		154.6	%	467		77.7	%	1,917		1,562		22.7	%
Income and social contribution taxes	(39	)	(181	)	-78.5	%	231		—		20		(518	)	—
Exchange variation (including net investment hedge)	101		(107	)	—		374		-73.0	%	487		(72	)	—
Other lines	(110	)	(74	)	48.6	%	(143	)	-23.1	%	(438	)	(4	)	—
IR/CS extraordinary items	(30	)	—		—		—		—		(29	)	(442	)	-93.4	%
Consolidated Net Income (1)	791		145		445.5	%	698		13.3	%	1,937		1,044		85.5	%
Non-recurring items	207		—		—		48		331.3	%	258		(786	)	—
Gains and losses on assets held for sale and sales os interest in subsidiaries	177		—		—		48		268.8	%	229		72		218.1	%
Reversal of IR/CS non-recurring items	30		—		—		—		—		29		—		—
Reversal of contingent liabilities, net	—		—		—		—		—		—		(858	)	—
Consolidated Adjusted Net Income (2)	998		145		588.3	%	746		33.8	%	2,195		258		750.8	%

(1) - Accounting measurement disclosed in the income statement of the Company.

(2) - Non accounting measurement made by the Company to demonstrate the net income adjusted by the extraordinary events that impacted the result, but without cash effect.

·In 3Q18 compared to 3Q17, the variation in the financial result was basically due to the effects from exchange variation on liabilities contracted in U.S. dollar, which were practically offset by the line “Income Tax/Social Contribution — effects from exchange variation that include net investment hedge.”

3

·Financial expenses decreased in 3Q18 compared to 3Q17, despite the 25% average depreciation in the Brazilian real between the periods, which affected a large portion of the dollar-denominated interest paid by the Company. The reduction reflects the Company’s efforts to reduce its gross debt.

·The higher adjusted net income in 3Q18 compared to 3Q17 was mainly due to the improvement in adjusted EBITDA.

Dividends

·Gerdau S.A. approved the payment of dividends in the amount of R$ 221.3 million (R$ 0.13 per share) in 3Q18, which was distributed as an advance on the minimum mandatory dividend stipulated in the Bylaws.

Payment date: December 3, 2018

Record date: shareholding position on November 21, 2018

Ex-dividend date: November 22, 2018

Working capital and Cash conversion cycle

·In September 2018, the cash conversion cycle (working capital divided by daily net sales in the quarter) increased in relation to June 2018, reflecting the 11.5% increase in working capital, which was higher than the 6.7% increase in net sales. The higher working capital was due to the increase in the line Inventories, reflecting the better business environment.

·In working capital from December 2017 to September 2018, assets and liabilities arising from the divestment of certain operations, mainly in North America, were excluded from the lines “Trade receivables,” “Inventories” and “Trade accounts payable” and reported in the lines “Asset held for sale” and “Liability held for sale,” as well as in the financial statements of the Company, in accordance with IFRS.

·Meanwhile, for the calculation of the cash conversion cycle of December 2017 to September 2018, “working capital” includes assets and liabilities arising from the divestment of operations, mainly in North America, to ensure comparability with “net sales,” which will be affected only after the divestment of said assets.

4

Financial liabilities

Debt composition (R$ million)	09.30.2018	06.30.2018	09.30.2017
Short Term	2,178	2,317	4,481
Long Term	16,015	15,798	14,193
Gross Debt	18,193	18,115	18,674
Cash, cash equivalents and short-term investments	3,475	2,941	5,067
Net Debt	14,718	15,174	13,607

·On September 30, 2018, gross debt was 12.0% short term and 88.0% long term, with 13.4% denominated in Brazilian real, 85.4% in U.S. dollar and 1.2% in other currencies.

·On September 30, 2018, 71.7% of cash was held by Gerdau companies abroad and denominated mainly in U.S. dollar.

·On September 30, 2018, the nominal weighted average cost of gross debt was 6.6%, or 6.8% for the portion denominated in Brazilian real, 5.6% plus exchange variation for the portion denominated in U.S. dollar contracted by companies in Brazil, and 8.8% for the portion contracted by subsidiaries abroad. On September 30, 2018, the average gross debt term was 6.6 years.

·On September 30, 2018, the payment schedule for long-term gross debt was as follows:

Long Term	R$ million
2019	71
2020	3,463
2021	2,039
2022	126
2023	2,197
2024	3,499
2025 and after	4,620
Total	16,015

·The key debt indicators are shown below:

Indicators	09.30.2018		06.30.2018		09.30.2017
Gross debt / Total capitalization (1)	40	%	41	%	42	%
Net debt(2) (R$) / EBITDA (3) (R$)	2.2x		2.7x		3.4x

(1) - Total capitalization = shareholders’ equity + gross debt- interest on debt

(2) - Net debt = gross debt - interest on debt - cash, cash equivalents and short-term investments

(3) -  Adjusted EBITDA in the last 12 months.

Investments

·In 3Q18, CAPEX amounted to R$ 319 million. Of the total capex in the quarter, 42.9% was allocated to the Brazil BD, 32.4% to the North America BD, 19.9% to the Special Steel BD and 4.8% to the South America BD. In the first nine months of 2018, capex came to R$ 835 million.

·CAPEX for 2018 is R$ 1.2 billion, to be allocated primarily to productivity gains and maintenance.

Divestments

·On July 31, 2018, Gerdau concluded the sale of its two hydropower plants in Goiás for R$ 835 million to Kinross Brasil Mineração, a wholly-owned subsidiary of the mining company Kinross Gold Corporation. The plants Caçu and Barra dos Coqueiros, inaugurated in 2010, have aggregate installed capacity of 155 MW.

·On October 31, 2018, Gerdau concluded the sale 100% of the operations and assets in India, including the special steel industrial unit located in Tadipatri, with annual installed capacity of 250 thousand tonnes of crude steel and 300 thousand tonnes of rolled steel, to Blue Coral Investment Holdings Pte. Ltd and Mountainpeak Investment Holdings Ltd, for US$ 120 million.

5

·On November 05, 2018, Gerdau concluded the sale to Commercial Metals Company (CMC) of four U.S. rebar mills and rebar fabrication locations. The sale includes the steel mills in Jacksonville, FL, Knoxville, TN, Rancho Cucamonga, CA, and Sayreville, NJ, as well as all of Gerdau’s U.S. rebar fabrication facilities. The transaction was originally announced on January 2, 2018, for US$ 600 million, as well as an approximately US$100 million estimated working capital adjustment.  The purchase price is subject to a further customary purchase price adjustment as described in the Purchase Agreement. The cash received will be used to reduce financial leverage.

·Gerdau concluded its divestment program to focus on its most profitable operations in the Americas. Since 2014, the Company’s divestments are more than R$ 7.0 billion.

Free Cash Flow (FCF)

·In 3Q18, free cash flow amounted to R$ 405 million, supported by the highest quarterly adjusted EBITDA of the last 10 years, which was more than sufficient to cover CAPEX, income tax, interest obligations, as well as working capital consumption.

Free Cash Flow 3Q18

(R$ million)

Free cash flow by quarter

(R$ million)

Business Divisions (BD)

6

The information in this report is divided into four Business Divisions (BD) in accordance with Gerdau’s corporate governance, as follows:

·Brazil BD (Brazil Business Division) — includes the operations in Brazil (except special steel) and the iron ore operation in Brazil;

·North America BD (North America Business Division) — includes all operations in North America (Canada, United States and Mexico), except special steel, as well as the jointly controlled entity and associate company, both located in Mexico;

·South America BD (South America Business Division) — includes all operations in South America (Argentina, Peru, Uruguay and Venezuela), except the operations in Brazil, and the jointly controlled entities in the Dominican Republic and Colombia;

·Special Steel BD (Special Steel Business Division) — includes the special steel operations in Brazil, United States and India.

Net Sales

7

EBITDA & EBITDA Margin

Brazil BD

Brazil BD	3rd Quarter 2018		3rd Quarter 2017		Variation 3Q18/3Q17		2nd Quarter 2018		Variation 3Q18/2Q18		9 months 2018		9 months 2017		Variation 9M18/9M17
Volumes (1,000 tonnes)
Production of crude steel	1,479		1,565		-5.5	%	1,381		7.1	%	4,391		4,591		-4.4	%
Shipments of steel	1,422		1,488		-4.4	%	1,364		4.3	%	4,225		4,146		1.9	%
Domestic Market	1,085		974		11.4	%	982		10.5	%	3,064		2,709		13.1	%
Exports	337		514		-34.4	%	382		-11.8	%	1,161		1,437		-19.2	%
Shipments of long steel	1,060		1,126		-5.9	%	1,025		3.4	%	3,158		3,190		-1.0	%
Domestic Market	754		711		6.0	%	692		9.0	%	2,094		1,978		5.9	%
Exports	306		415		-26.3	%	333		-8.1	%	1,064		1,212		-12.2	%
Shipments of flat steel	362		362		0.0	%	339		6.8	%	1,067		956		11.6	%
Domestic Market	331		263		25.9	%	290		14.1	%	970		731		32.7	%
Exports	31		99		-68.7	%	49		-36.7	%	97		225		-56.9	%
Results (R$ million)
Net Sales(1)	4,390		3,244		35.3	%	3,798		15.6	%	11,799		9,088		29.8	%
Domestic Market	3,572		2,473		44.4	%	2,931		21.9	%	9,297		6,977		33.3	%
Exports	818		771		6.2	%	867		-5.6	%	2,502		2,111		18.5	%
Cost of Goods Sold	(3,602	)	(2,878	)	25.2	%	(3,138	)	14.8	%	(9,670	)	(8,046	)	20.2	%
Gross profit	788		366		115.4	%	660		19.4	%	2,129		1,042		104.4	%
Gross margin (%)	18.0	%	11.3	%			17.4	%			18.0	%	11.5	%
EBITDA	891		458		94.5	%	743		19.9	%	2,385		1,319		80.8	%
EBITDA margin (%)	20.3	%	14.1	%			19.6	%			20.2	%	14.5	%

(1) - Includes iron ore net sales.

Production and shipments

·Crude steel production decreased in 3Q18 in relation to 3Q17, due to the scheduled maintenance shutdown of Blast Furnace 2 in Ouro Branco, MG.

8

·Because of the scheduled shutdown, the Company opted to prioritize its shipments in the domestic market, which resulted in a better shipment mix and lower total shipments. Shipments to the domestic market increased in relation to both 3Q17 and 2Q18, driven mainly by goods related to the industrial sector and, to a lesser extent, the construction retail sector.

·In 3Q18, 878,000 tonnes of iron ore were sold to third parties and 1.115,000 tonnes were consumed internally.

Operating result

·Net sales increased in 3Q18 compared to 3Q17 and 2Q18, due to the increase in net sales per tonne sold in both the domestic and export markets.

·Cost of goods sold increased in 3Q18 in relation to 3Q17 and 2Q18, explained by the higher raw material costs and by the costs with the scheduled maintenance shutdown of Blast Furnace 2 in Ouro Branco, MG.

·Gross margin expanded in 3Q18 in relation to 3Q17 and 2Q18, since the increase in net revenue per tonne sold surpassed the increase in costs per tonne sold.

·EBITDA and EBITDA margin increased in 3Q18 compared to 3Q17 and 2Q18, accompanying the performance of gross profit and gross margin.

EBITDA (R$ million) and EBITDA Margin (%)

North America BD

North America BD	3rd Quarter 2018		3rd Quarter 2017		Variation 3Q18/3Q17		2nd Quarter 2018		Variation  3Q18/2Q18		9 months 2018		9 months 2017		Variation 9M18/9M17
Volumes (1,000 tonnes)
Production of crude steel	1,699		1,709		-0.6	%	1,755		-3.2	%	5,252		5,121		2.6	%
Shipments of steel	1,532		1,624		-5.7	%	1,665		-8.0	%	4,886		4,747		2.9	%
Results (R$ million)
Net Sales	5,753		4,003		43.7	%	5,411		6.3	%	15,593		11,531		35.2	%
Cost of Goods Sold	(5,155	)	(3,811	)	35.3	%	(4,907	)	5.1	%	(14,250	)	(11,037	)	29.1	%
Gross profit	598		192		211.4	%	504		18.6	%	1,343		494		171.8	%
Gross margin (%)	10.4	%	4.8	%			9.3	%			8.6	%	4.3	%
EBITDA	605		239		153.1	%	497		21.7	%	1,350		630		114.3	%
EBITDA margin (%)	10.5	%	6.0	%			9.2	%			8.7	%	5.5	%

Production and shipments

·Shipments decreased in 3Q18 in relation to 3Q17, due to the deconsolidation of the wire rod operations in the United States as of April 2018. Excluding this effect, shipments would have increased.

·Shipments decreased in 3Q18 in relation to 2Q18, mainly due to difficulties with delivering goods at certain units on the U.S. East Coast because of Hurricane Florence and to the effect of heavy rains in Texas.

Operating result

·Net sales increased in 3Q18 compared to both 3Q17 and 2Q18, due to the higher net sales per tonne sold, influenced by the improvement of the international market.

9

·The increase in cost of goods sold in 3Q18 compared to 3Q17 and 2Q18 was mainly due to higher scrap costs. The improvement in gross margin is explained by the increase in net sales per tonne sold surpassing the increase in cost per tonne sold.

·The growth in EBITDA and EBITDA margin in 3Q18 in relation to 3Q17 and 2Q18 accompanied the performance of gross profit and gross margin in the same comparison periods.

·Note that in 3Q18, the North America BD posted its highest EBITDA since 2008.

EBITDA (R$ million) and EBITDA Margin (%)

South America BD

South America BD	3rd Quarter 2018		3rd Quarter 2017		Variation 3Q18/3Q17		2nd Quarter 2018		Variation 3Q18/2Q18		9 months 2018		9 months 2017		Variation 9M18/9M17
Volumes (1,000 tonnes)
Production of crude steel	142		207		-31.4	%	216		-34.2	%	601		789		-23.8	%
Shipments of steel	283		409		-30.8	%	386		-26.7	%	1,044		1,340		-22.1	%
Results (R$ million)
Net Sales	908		930		-2.4	%	1,108		-18.1	%	2,982		2,901		2.8	%
Cost of Goods Sold	(762	)	(801	)	-4.9	%	(957	)	-20.4	%	(2,530	)	(2,551	)	-0.8	%
Gross profit	146		129		13.2	%	151		-3.3	%	452		350		29.1	%
Gross margin (%)	16.1	%	13.9	%			13.6	%			15.2	%	12.1	%
EBITDA	185		147		25.9	%	179		3.4	%	551		392		40.6	%
EBITDA margin (%)	20.4	%	15.8	%			16.2	%			18.5	%	13.5	%

Production and shipments

·Production and shipments decreased in 3Q18 compared to 3Q17 and 2Q18, mainly due to the deconsolidation of Chile as of July 2018.

Operating result

·Net sales and cost of goods sold decreased in 3Q18 compared to 3Q17 and 2Q18, due to the deconsolidation of Chile.

·Gross margin expanded in 3Q18 compared to 3Q17 and 2Q18, since the increase in net sales per tonne sold outpaced the increase in cost per tonne sold, influenced by the higher international prices.

10

·EBITDA and EBITDA margin increased in 3Q18 in relation to 3Q17 and 2Q18, due to the higher international prices, as well as the deconsolidation of Chile, which is aligned with the Company’s strategy of divesting assets to focus on its more profitable ones.

EBITDA (R$ million) and EBITDA Margin (%)

Special Steel BD

Special Steel BD	3rd Quarter 2018		3rd Quarter 2017		Variation 3Q18/3Q17		2nd Quarter 2018		Variation 3Q18/2Q18		9 months 2018		9 months 2017		Variation 9M18/9M17
Volumes (1,000 tonnes)
Production of crude steel	649		580		11.8	%	637		1.8	%	1,877		1,670		12.4	%
Shipments of steel	554		525		5.5	%	569		-2.7	%	1,637		1,478		10.8	%
Results (R$ million)
Net Sales	2,305		1,648		39.9	%	2,133		8.1	%	6,170		4,620		33.5	%
Cost of Goods Sold	(1,977	)	(1,360	)	45.3	%	(1,807	)	9.4	%	(5,251	)	(3,940	)	33.3	%
Gross profit	328		288		14.0	%	326		0.7	%	919		680		35.2	%
Gross margin (%)	14.2	%	17.5	%			15.3	%			14.9	%	14.7	%
EBITDA	372		341		9.1	%	386		-3.6	%	1,072		830		29.2	%
EBITDA margin (%)	16.1	%	20.7	%			18.1	%			17.4	%	18.0	%

Production and shipments

·Crude steel production and shipments increased in 3Q18 compared 3Q17, mainly due to the growth in the automotive industry in Brazil, despite the reduction in vehicle exports.

Operating result

·Net sales increased in 3Q18 compared to both 3Q17 and 2Q18, due to the higher net sales per tonne sold.

·Cost of goods sold increased in relation to both 3Q17 and 2Q18, due to the higher costs of raw materials in general, especially scrap and metallic alloys.

11

·Gross margin decreased in 3Q18 compared to both 3Q17 and 2Q18, since the increase in costs per tonne sold surpassed the increase in net sales per tonne sold, which is non-recurring. This non-recurring effect can be confirmed by comparing the margins of 9M18 with those of 9M17, which are similar.

·Meanwhile, EBITDA margin accompanied the decrease in gross margin in relation to both 3Q17 and 2Q18.

EBITDA (R$ million) and EBITDA Margin (%)

THE MANAGEMENT

This document contains forward-looking statements. These statements are based on estimates, information or methods that may be incorrect or inaccurate and that may not occur. These estimates are also subject to risks, uncertainties, and assumptions that include, among other factors: general economic, political, and commercial conditions in Brazil and in the markets where we operate, as well as existing and future government regulations. Potential investors are cautioned that these forward-looking statements do not constitute guarantees of future performance, given that they involve risks and uncertainties. Gerdau does not undertake and expressly waives any obligation to update any of these forward-looking statements, which are valid only on the date on which they were made.

12

GERDAU S.A.

CONSOLIDATED BALANCE SHEETS

In thousands of Brazilian reais (R$)

	September 30, 2018	December 31, 2017
CURRENT ASSETS
Cash and cash equivalents	2,795,196	2,555,338
Short-term investments
Held for Trading	679,994	821,518
Trade accounts receivable - net	4,193,568	2,798,420
Inventories	9,124,052	6,701,404
Tax credits	471,553	402,429
Income and social contribution taxes recoverable	412,290	487,633
Unrealized gains on financial instruments	49,478	—
Assets held for sale	3,982,273	3,745,634
Other current assets	461,216	469,737
	22,169,620	17,982,113
NON-CURRENT ASSETS
Tax credits	37,013	30,841
Deferred income taxes	3,610,574	3,054,393
Unrealized gains on financial instruments	805	—
Related parties	41,506	51,839
Judicial deposits	2,126,690	2,051,181
Other non-current assets	519,448	542,973
Prepaid pension cost	14,505	1,149
Investments in associates and jointly-controlled entities	1,472,356	1,280,299
Goodwill	9,409,197	7,891,142
Other Intangibles	910,466	972,089
Property, plant and equipment, net	15,806,794	16,443,742
	33,949,354	32,319,648
TOTAL ASSETS	56,118,974	50,301,761

13

GERDAU S.A.

CONSOLIDATED BALANCE SHEETS

In thousands of Brazilian reais (R$)

	September 30, 2018		December 31, 2017
CURRENT LIABILITIES
Trade accounts payable	4,149,641		3,179,954
Short-term debt	2,177,261		2,004,341
Taxes payable	408,522		284,101
Income and social contribution taxes payable	204,355		70,242
Payroll and related liabilities	608,692		443,859
Employee benefits	463		253
Environmental liabilities	38,626		21,928
Unrealized losses on financial instruments	2,368		—
Liabilities held for sale	985,181		1,084,032
Other current liabilities	575,993		625,410
	9,151,102		7,714,120
NON-CURRENT LIABILITIES
Long-term debt	15,976,808		14,457,315
Debentures	38,575		47,928
Related parties	1,433		—
Deferred income taxes	266,132		82,686
Unrealized losses on financial instruments	—		1,267
Provision for tax, civil and labor liabilities	898,725		827,883
Environmental liabilities	74,760		63,263
Employee benefits	1,566,822		1,424,611
Obligations with FIDC	918,933		1,135,077
Other non-current liabilities	463,451		653,670
	20,205,639		18,693,700
EQUITY
Capital	19,249,181		19,249,181
Treasury stocks	(186,909	)	(76,085	)
Capital reserves	11,597		11,597
Retained earnings	4,813,798		3,315,374
Operations with non-controlling interests	(2,870,825	)	(2,870,831	)
Other reserves	5,532,721		4,015,965
EQUITY ATTRIBUTABLE TO THE EQUITY HOLDERS OF THE PARENT	26,549,563		23,645,201
NON-CONTROLLING INTERESTS	212,670		248,740
EQUITY	26,762,233		23,893,941
TOTAL LIABILITIES AND EQUITY	56,118,974		50,301,761

14

GERDAU S.A.

CONSOLIDATED STATEMENTS OF INCOME

In thousands of Brazilian reais (R$)

	For the three-month period ended				For the nine-month period ended
	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
NET SALES	12,835,621		9,476,204		35,259,776		27,100,721
Cost of sales	(10,973,599	)	(8,501,724	)	(30,413,955	)	(24,535,643	)
GROSS PROFIT	1,862,022		974,480		4,845,821		2,565,078
Selling expenses	(141,254	)	(130,887	)	(449,254	)	(402,630	)
General and administrative expenses	(277,071	)	(265,667	)	(820,449	)	(853,853	)
Other operating income	63,674		87,416		153,380		227,350
Other operating expenses	(55,701	)	(55,770	)	(124,340	)	(93,472	)
Results in operations with subsidiaries	(177,627	)	—		(228,948	)	(72,478	)
Reversal of contingent liabilities, net	—		—		—		929,711
Equity in earnings of unconsolidated companies	(2,589	)	(29,172	)	38,937		(32,411	)
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES	1,271,454		580,400		3,415,147		2,267,295
Financial income	57,134		53,192		122,420		179,106
Financial expenses	(401,244	)	(409,698	)	(1,154,539	)	(1,326,715	)
Exchange variations, net	(114,400	)	101,653		(509,673	)	80,302
Reversal of monetary update of contingent liabilities, net	—		—		—		369,819
Gain and losses on financial instruments, net	16,996		777		44,051		(7,829	)
INCOME BEFORE TAXES	829,940		326,324		1,917,406		1,561,978
Current	(118,198	)	(51,632	)	(418,642	)	(197,559	)
Deferred	78,775		(129,839	)	438,453		(319,505	)
Income and social contribution taxes	(39,423	)	(181,471	)	19,811		(517,064	)
NET INCOME	790,517		144,853		1,937,217		1,044,914
(+) Results in operations with subsidiaries	177,627		—		228,948		72,478
(-) Reversal of contingent liabilities, net	—		—		—		(929,711	)
(-) Reversal of monetary update of contingent liabilities, net	—		—		—		(369,819	)
(+) Income tax on non-recurring items	30,060		—		29,247		441,840
	207,687		—		258,195		(785,212	)
ADJUSTED NET INCOME*	998,204		144,853		2,195,412		259,702

* Adjusted net income is a non-accounting indicator prepared by the Company, reconciled with the financial statements and consists of net income adjusted by extraordinary events that influenced the net income, without cash effect.

15

GERDAU S.A.

CONSOLIDATED STATEMENTS OF CASH FLOWS

In thousands of Brazilian reais (R$)

	For the three-month period ended				For the nine-month period ended
	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
Cash flows from operating activities
Net income for the period	790,517		144,853		1,937,217		1,044,914
Adjustments to reconcile net income for the period to net cash provided by operating activities:
Depreciation and amortization	477,827		514,443		1,387,888		1,568,676
Equity in earnings of unconsolidated companies	2,589		29,172		(38,937	)	32,411
Exchange variation, net	114,400		(101,653	)	509,673		(80,302	)
(Gains)/Losses on financial instruments, net	(16,996	)	(777	)	(44,051	)	7,829
Post-employment benefits	51,205		47,449		144,352		151,141
Long term incentive plan	13,416		9,399		34,452		27,176
Income and social contribution taxes	39,423		181,471		(19,811	)	517,064
Gains on disposal of property, plant and equipment, net	12,661		(3,663	)	(27,873	)	(65,119	)
Results in operations with subsidiaries	177,627		—		228,948		72,478
Allowance for doubtful accounts	(2,919	)	(4,376	)	17,316		3,362
Provision for tax, labor and civil claims	112,001		(271,981	)	71,281		(130,500	)
Reversal of contingent liabilities, net	—		—		—		(929,711	)
Interest income on trading securities	(13,857	)	(19,320	)	(34,572	)	(63,928	)
Interest expense on loans	310,581		329,928		880,825		1,033,700
Reversal of monetary update of contingent liabilities, net	—		—		—		(369,819	)
Interest on loans with related parties	(103	)	—		(194	)	—
Provision (Reversal) for net realizable value adjustment in inventory, net	4,170		(3,526	)	6,591		(16,410	)
	2,072,542		851,419		5,053,105		2,802,962
Changes in assets and liabilities
Increase in trade accounts receivable	(74,772	)	(403,254	)	(1,115,101	)	(735,663	)
(Increase) Decrease in inventories	(923,808	)	8,784		(2,386,479	)	(759,921	)
(Decrease) Increase in trade accounts payable	(10,561	)	227,272		621,748		541,916
Increase in other receivables	(93,802	)	(36,119	)	(123,985	)	(248,244	)
(Decrease) Increase in other payables	(278,317	)	132,224		(711,211	)	7,843
Dividends from associates and joint ventures	37,577		9,837		49,139		30,822
Purchases of trading securities	(580,709	)	(1,476,417	)	(1,063,386	)	(1,966,491	)
Proceeds from maturities and sales of trading securities	177,455		803,279		974,303		1,245,247
Cash provided by operating activities	325,605		117,025		1,298,133		918,471
Interest paid on loans and financing	(232,488	)	(314,554	)	(798,922	)	(1,042,937	)
Income and social contribution taxes paid	(59,757	)	(33,418	)	(216,823	)	(89,697	)
Net cash provided (used) in operating activities	33,360		(230,947	)	282,388		(214,163	)
Cash flows from investing activities
Additions to property, plant and equipment	(319,031	)	(170,204	)	(834,834	)	(602,054	)
Proceeds from sales of property, plant and equipment, investments and other intangibles	849,260		134,545		1,776,326		550,069
Additions to other intangibles	(28,182	)	(8,936	)	(42,147	)	(25,555	)
Capital increase in joint venture	—		—		—		(178,670	)
Net cash provided (used) in investing activities	502,047		(44,595	)	899,345		(256,210	)
Cash flows from financing activities
Purchase of treasury shares	—		—		(149,711	)	—
Dividends and interest on capital paid	(206,620	)	(33,741	)	(378,343	)	(36,023	)
Proceeds from loans and financing	70,710		434,638		964,216		784,222
Repayment of loans and financing	(360,347	)	(1,038,447	)	(1,706,231	)	(1,956,214	)
Intercompany loans, net	1,419		2,631		11,961		6,120
Net cash used in financing activities	(494,838	)	(634,919	)	(1,258,108	)	(1,201,895	)
Exchange variation on cash and cash equivalents	116,936		(131,979	)	316,233		(128,121	)
Increase (Decrease) in cash and cash equivalents	157,505		(1,042,440	)	239,858		(1,800,389	)
Cash and cash equivalents at beginning of period	2,637,691		4,305,434		2,555,338		5,063,383
Cash and cash equivalents at end of period	2,795,196		3,262,994		2,795,196		3,262,994

16