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SEGMENT REPORTING - Summary (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment reporting as per business segments        
Net sales R$ 43,814,661 R$ 39,644,010 R$ 46,159,478  
Cost of sales (37,884,102) (35,440,726) (40,010,100)  
GROSS PROFIT 5,930,559 4,203,284 6,149,378  
Selling, general and administrative expenses (1,530,385) (1,430,456) (1,652,880)  
Other operating income (expenses) 1,117,699 449,200 (34,992)  
Impairment of non-financial assets (411,925) 0 0  
Impairment of financial assets (64,132) (21,044) (9,914)  
Gains and losses on assets held for sale and sales of interest in subsidiaries 0 0 (414,507)  
Equity in earnings of unconsolidated companies 152,569 (17,050) 10,141  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 5,194,385 3,183,934 4,047,226  
Financial result, net (1,698,707) (1,509,214) (1,889,795)  
INCOME (LOSS) BEFORE TAXES 3,495,678 1,674,720 2,157,431  
Income and social contribution taxes (1,107,624) (457,833) 168,951  
Net income 2,388,054 1,216,887 2,326,382  
Depreciation/amortization 2,499,104 2,074,295 1,891,814  
Investments in associates and jointly-controlled entities 2,271,629 1,812,399 1,367,802 R$ 1,280,299
Total assets 63,123,009 54,002,970 51,281,029  
Total liabilities 32,037,799 26,829,843 25,342,458  
North America        
Segment reporting as per business segments        
Impairment of non-financial assets (342,355)      
Special Steel        
Segment reporting as per business segments        
Impairment of non-financial assets (69,570)      
Operating Segments | Brazil        
Segment reporting as per business segments        
Net sales 17,752,823 16,122,171 15,745,161  
Cost of sales (14,179,991) (14,363,253) (13,044,433)  
GROSS PROFIT 3,572,832 1,758,918 2,700,728  
Selling, general and administrative expenses (562,019) (539,344) (569,595)  
Other operating income (expenses) 31,500 295,818 (33,814)  
Impairment of financial assets (23,177) (2,012) 5,564  
Equity in earnings of unconsolidated companies (1,287) (828) (1,700)  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 3,017,849 1,512,552 2,101,183  
Financial result, net (442,972) (520,821) (442,966)  
INCOME (LOSS) BEFORE TAXES 2,574,877 991,731 1,658,217  
Income and social contribution taxes (652,126) (214,400) (410,651)  
Net income 1,922,751 777,331 1,247,566  
Depreciation/amortization 1,135,294 1,008,713 951,826  
Investments in associates and jointly-controlled entities 10,186 11,472 3,250  
Total assets 21,099,735 17,195,824 17,473,039  
Total liabilities 7,469,541 4,686,686 8,072,380  
Operating Segments | North America        
Segment reporting as per business segments        
Net sales 17,458,318 14,656,028 19,927,390  
Cost of sales (16,212,757) (13,351,209) (18,164,834)  
GROSS PROFIT 1,245,561 1,304,819 1,762,556  
Selling, general and administrative expenses (476,518) (444,326) (602,351)  
Other operating income (expenses) 97,751 44,660 19,114  
Impairment of non-financial assets (342,355)      
Impairment of financial assets (36,286) (14,612) (5,230)  
Equity in earnings of unconsolidated companies 23,512 (110,959) (77,872)  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 511,665 779,582 1,096,217  
Financial result, net (206,405) (99,029) (37,351)  
INCOME (LOSS) BEFORE TAXES 305,260 680,553 1,058,866  
Income and social contribution taxes (178,447) (188,458) (224,897)  
Net income 126,813 492,095 833,969  
Depreciation/amortization 777,369 571,015 511,154  
Investments in associates and jointly-controlled entities 908,338 681,807 301,271  
Total assets 18,583,439 15,178,053 14,659,926  
Total liabilities 5,261,820 4,506,771 4,935,210  
Operating Segments | South America        
Segment reporting as per business segments        
Net sales 3,831,406 3,259,253 3,801,210  
Cost of sales (3,015,189) (2,762,157) (3,230,952)  
GROSS PROFIT 816,217 497,096 570,258  
Selling, general and administrative expenses (116,479) (119,627) (132,245)  
Other operating income (expenses) 16,684 17,416 (11,421)  
Impairment of financial assets (2,436) (1,906) (4,462)  
Equity in earnings of unconsolidated companies 99,341 66,468 51,648  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 813,327 459,447 473,778  
Financial result, net (60,787) (163,459) (117,270)  
INCOME (LOSS) BEFORE TAXES 752,540 295,988 356,508  
Income and social contribution taxes (195,440) (100,341) (86,667)  
Net income 557,100 195,647 269,841  
Depreciation/amortization 142,143 120,462 88,537  
Investments in associates and jointly-controlled entities 976,046 748,392 701,233  
Total assets 5,448,922 4,562,604 4,421,487  
Total liabilities 1,360,098 996,876 1,053,007  
Operating Segments | Special Steel        
Segment reporting as per business segments        
Net sales 6,096,471 6,701,900 8,158,626  
Cost of sales (5,794,666) (6,167,502) (7,064,608)  
GROSS PROFIT 301,805 534,398 1,094,018  
Selling, general and administrative expenses (179,822) (170,170) (180,251)  
Other operating income (expenses) 55,097 35,571 10,081  
Impairment of non-financial assets (69,570)      
Impairment of financial assets (2,233) (2,513) (5,786)  
Equity in earnings of unconsolidated companies 8,899 6,776 15,629  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 114,176 404,062 933,691  
Financial result, net (215,433) (109,116) (112,109)  
INCOME (LOSS) BEFORE TAXES (101,257) 294,946 821,582  
Income and social contribution taxes 13,229 (60,749) (191,386)  
Net income (88,028) 234,197 630,196  
Depreciation/amortization 444,298 374,105 340,297  
Investments in associates and jointly-controlled entities 231,152 224,201 213,899  
Total assets 11,233,676 8,597,180 8,825,830  
Total liabilities 1,994,575 1,604,885 1,736,085  
Eliminations and Adjustments        
Segment reporting as per business segments        
Net sales (1,324,357) (1,095,342) (1,472,909)  
Cost of sales 1,318,501 1,203,395 1,494,727  
GROSS PROFIT (5,856) 108,053 21,818  
Selling, general and administrative expenses (195,547) (156,989) (168,438)  
Other operating income (expenses) 916,667 55,734 (18,952)  
Gains and losses on assets held for sale and sales of interest in subsidiaries     (414,507)  
Equity in earnings of unconsolidated companies 22,104 21,493 22,436  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 737,368 28,291 (557,643)  
Financial result, net (773,110) (616,789) (1,180,099)  
INCOME (LOSS) BEFORE TAXES (35,742) (588,498) (1,737,742)  
Income and social contribution taxes (94,840) 106,115 1,082,552  
Net income (130,582) (482,383) (655,190)  
Investments in associates and jointly-controlled entities 145,907 146,527 148,149  
Total assets 6,757,237 8,469,309 5,900,747  
Total liabilities 15,951,765 15,034,625 9,545,776  
Eliminations and Adjustments | Brazil        
Segment reporting as per business segments        
Net sales (1,149,618) (920,659) (1,280,770)  
Eliminations and Adjustments | North America        
Segment reporting as per business segments        
Net sales (60,370) (62,196) (84,335)  
Eliminations and Adjustments | South America        
Segment reporting as per business segments        
Net sales (41)   (4,988)  
Eliminations and Adjustments | Special Steel        
Segment reporting as per business segments        
Net sales R$ (114,328) R$ (112,487) R$ (102,816)