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SEGMENT REPORTING - Summary (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment reporting as per business segments        
Net sales R$ 39,644,010 R$ 46,159,478 R$ 36,917,619  
Cost of sales (35,440,726) (40,010,100) (33,312,995)  
GROSS PROFIT 4,203,284 6,149,378 3,604,624  
Selling, general and administrative expenses (1,430,456) (1,662,794) (1,654,908)  
Other operating income (expenses) 428,156 (34,992) 91,731  
Impairment of non-financial assets     (1,114,807)  
Gains and losses on assets held for sale and sales of interest in subsidiaries   (414,507) (721,682)  
Reversal of contingent liabilities, net     929,711  
Equity in earnings of unconsolidated companies (17,050) 10,141 (34,597)  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 3,183,934 4,047,226 1,100,072  
Financial result, net (1,509,214) (1,889,795) (1,143,348)  
INCOME (LOSS) BEFORE TAXES 1,674,720 2,157,431 (43,276)  
Income and social contribution taxes (457,833) 168,951 (295,391)  
Net income (loss) 1,216,887 2,326,382 (338,667)  
Depreciation/amortization 2,074,295 1,891,814 2,092,551  
Investments in associates and jointly-controlled entities 1,812,399 1,367,802 1,280,299 R$ 798,844
Total assets 54,002,970 51,281,029 50,301,761  
Total liabilities 26,829,843 25,342,458 26,407,820  
Operating Segments | Brazil        
Segment reporting as per business segments        
Net sales 16,122,171 15,745,161 12,562,727  
Cost of sales (14,363,253) (13,044,433) (10,996,383)  
GROSS PROFIT 1,758,918 2,700,728 1,566,344  
Selling, general and administrative expenses (539,344) (564,031) (539,613)  
Other operating income (expenses) 293,806 (33,814) (11,513)  
Impairment of non-financial assets     (45,279)  
Equity in earnings of unconsolidated companies (828) (1,700)    
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 1,512,552 2,101,183 969,939  
Financial result, net (520,821) (442,966) (564,397)  
INCOME (LOSS) BEFORE TAXES 991,731 1,658,217 405,542  
Income and social contribution taxes (214,400) (410,651) (103,263)  
Net income (loss) 777,331 1,247,566 302,279  
Depreciation/amortization 1,008,713 951,826 909,333  
Investments in associates and jointly-controlled entities 11,472 3,250    
Total assets 17,195,824 17,473,039 17,051,262  
Total liabilities 4,686,686 8,072,380 9,592,948  
Operating Segments | North America        
Segment reporting as per business segments        
Net sales 14,656,028 19,927,390 15,433,380  
Cost of sales (13,351,209) (18,164,834) (14,823,590)  
GROSS PROFIT 1,304,819 1,762,556 609,790  
Selling, general and administrative expenses (444,326) (607,581) (569,696)  
Other operating income (expenses) 30,048 19,114 29,113  
Impairment of non-financial assets     (1,069,528)  
Equity in earnings of unconsolidated companies (110,959) (77,872) (111,581)  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 779,582 1,096,217 (1,111,902)  
Financial result, net (99,029) (37,351) (46,184)  
INCOME (LOSS) BEFORE TAXES 680,553 1,058,866 (1,158,086)  
Income and social contribution taxes (188,458) (224,897) 201,807  
Net income (loss) 492,095 833,969 (956,279)  
Depreciation/amortization 571,015 511,154 684,121  
Investments in associates and jointly-controlled entities 681,807 301,271 346,080  
Total assets 15,178,053 14,659,926 14,872,755  
Total liabilities 4,506,771 4,935,210 3,315,546  
Operating Segments | South America        
Segment reporting as per business segments        
Net sales 3,259,253 3,801,210 4,025,736  
Cost of sales (2,762,157) (3,230,952) (3,523,394)  
GROSS PROFIT 497,096 570,258 502,342  
Selling, general and administrative expenses (119,627) (136,707) (202,862)  
Other operating income (expenses) 15,510 (11,421) 11,260  
Equity in earnings of unconsolidated companies 66,468 51,648 41,554  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 459,447 473,778 352,294  
Financial result, net (163,459) (117,270) (74,301)  
INCOME (LOSS) BEFORE TAXES 295,988 356,508 277,993  
Income and social contribution taxes (100,341) (86,667) (123,552)  
Net income (loss) 195,647 269,841 154,441  
Depreciation/amortization 120,462 88,537 155,038  
Investments in associates and jointly-controlled entities 748,392 701,233 584,898  
Total assets 4,562,604 4,421,487 5,208,265  
Total liabilities 996,876 1,053,007 1,711,963  
Operating Segments | Special Steel        
Segment reporting as per business segments        
Net sales 6,701,900 8,158,626 6,228,543  
Cost of sales (6,167,502) (7,064,608) (5,301,172)  
GROSS PROFIT 534,398 1,094,018 927,371  
Selling, general and administrative expenses (170,170) (186,037) (166,656)  
Other operating income (expenses) 33,058 10,081 14,989  
Equity in earnings of unconsolidated companies 6,776 15,629 15,460  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 404,062 933,691 791,164  
Financial result, net (109,116) (112,109) (122,837)  
INCOME (LOSS) BEFORE TAXES 294,946 821,582 668,327  
Income and social contribution taxes (60,749) (191,386) (192,902)  
Net income (loss) 234,197 630,196 475,425  
Depreciation/amortization 374,105 340,297 344,059  
Investments in associates and jointly-controlled entities 224,201 213,899 199,647  
Total assets 8,597,180 8,825,830 8,834,041  
Total liabilities 1,604,885 1,736,085 2,753,091  
Eliminations and Adjustments        
Segment reporting as per business segments        
Net sales (1,095,342) (1,472,909) (1,332,767)  
Cost of sales 1,203,395 1,494,727 1,331,544  
GROSS PROFIT 108,053 21,818 (1,223)  
Selling, general and administrative expenses (156,989) (168,438) (176,081)  
Other operating income (expenses) 55,734 (18,952) 47,882  
Gains and losses on assets held for sale and sales of interest in subsidiaries   (414,507) (721,682)  
Reversal of contingent liabilities, net     929,711  
Equity in earnings of unconsolidated companies 21,493 22,436 19,970  
INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 28,291 (557,643) 98,577  
Financial result, net (616,789) (1,180,099) (335,629)  
INCOME (LOSS) BEFORE TAXES (588,498) (1,737,742) (237,052)  
Income and social contribution taxes 106,115 1,082,552 (77,481)  
Net income (loss) (482,383) (655,190) (314,533)  
Investments in associates and jointly-controlled entities 146,527 148,149 149,674  
Total assets 8,469,309 5,900,747 4,335,438  
Total liabilities 15,034,625 9,545,776 9,034,272  
Eliminations and Adjustments | Brazil        
Segment reporting as per business segments        
Net sales (920,659) (1,280,770) (1,216,526)  
Eliminations and Adjustments | North America        
Segment reporting as per business segments        
Net sales (62,196) (84,335) (59,478)  
Eliminations and Adjustments | South America        
Segment reporting as per business segments        
Net sales   (4,988) (6,490)  
Eliminations and Adjustments | Special Steel        
Segment reporting as per business segments        
Net sales R$ (112,487) R$ (102,816) R$ (50,273)