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SEGMENT REPORTING - Summary (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment reporting as per business segments        
Net sales R$ 46,159,478 R$ 36,917,619 R$ 37,651,667  
Cost of sales (40,010,100) (33,312,995) (34,187,941)  
GROSS PROFIT 6,149,378 3,604,624 3,463,726  
Selling, general and administrative expenses (1,662,794) (1,654,908) (2,239,028)  
Other operating income (expenses) (34,992) 91,731 127,847  
Impairment of assets   (1,114,807) (2,917,911)  
Results in operations with subsidiaries and associate company (414,507) (721,682) (58,223)  
Reversal of provision for tax liabilities, net   929,711    
Equity in earnings of unconsolidated companies 10,141 (34,597) (12,771)  
INCOME (LOSS) BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 4,047,226 1,100,072 (1,636,360)  
Financial result, net (1,889,795) (1,143,348) (945,255)  
INCOME (LOSS) BEFORE TAXES 2,157,431 (43,276) (2,581,615)  
Income and social contribution taxes 168,951 (295,391) (304,314)  
Net income (loss) 2,326,382 (338,667) (2,885,929)  
Depreciation/amortization 1,891,814 2,092,551 2,535,955  
Investments in associates and jointly-controlled entities 1,367,802 1,280,299 798,844 R$ 1,392,882
Total assets 51,281,029 50,301,761 54,635,141  
Total liabilities 25,342,458 26,407,820 30,360,488  
Operating Segments | Brazil        
Segment reporting as per business segments        
Net sales 15,745,161 12,562,727 11,634,862  
Cost of sales (13,044,433) (10,996,383) (10,405,078)  
GROSS PROFIT 2,700,728 1,566,344 1,229,784  
Selling, general and administrative expenses (564,031) (539,613) (678,369)  
Other operating income (expenses) (33,814) (11,513) 2,111  
Impairment of assets   (45,279)    
Equity in earnings of unconsolidated companies (1,700)      
INCOME (LOSS) BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 2,101,183 969,939 553,526  
Financial result, net (442,966) (564,397) (603,373)  
INCOME (LOSS) BEFORE TAXES 1,658,217 405,542 (49,847)  
Income and social contribution taxes (410,651) (103,263) 13,140  
Net income (loss) 1,247,566 302,279 (36,707)  
Depreciation/amortization 951,826 909,333 952,848  
Investments in associates and jointly-controlled entities 3,250      
Total assets 17,473,039 17,051,262 18,672,770  
Total liabilities 8,072,380 9,592,948 10,761,705  
Operating Segments | North America        
Segment reporting as per business segments        
Net sales 19,927,390 15,433,380 15,430,814  
Cost of sales (18,164,834) (14,823,590) (14,514,789)  
GROSS PROFIT 1,762,556 609,790 916,025  
Selling, general and administrative expenses (607,581) (569,696) (778,218)  
Other operating income (expenses) 19,114 29,113 26,223  
Impairment of assets   (1,069,528) (2,779,146)  
Equity in earnings of unconsolidated companies (77,872) (111,581) (46,917)  
INCOME (LOSS) BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 1,096,217 (1,111,902) (2,662,033)  
Financial result, net (37,351) (46,184) (63,654)  
INCOME (LOSS) BEFORE TAXES 1,058,866 (1,158,086) (2,725,687)  
Income and social contribution taxes (224,897) 201,807 133,818  
Net income (loss) 833,969 (956,279) (2,591,869)  
Depreciation/amortization 511,154 684,121 874,299  
Investments in associates and jointly-controlled entities 301,271 346,080 303,526  
Total assets 14,659,926 14,872,755 16,459,784  
Total liabilities 4,935,210 3,315,546 3,407,444  
Operating Segments | South America        
Segment reporting as per business segments        
Net sales 3,801,210 4,025,736 4,775,598  
Cost of sales (3,230,952) (3,523,394) (4,103,231)  
GROSS PROFIT 570,258 502,342 672,367  
Selling, general and administrative expenses (136,707) (202,862) (253,177)  
Other operating income (expenses) (11,421) 11,260 41,396  
Impairment of assets     (138,765)  
Equity in earnings of unconsolidated companies 51,648 41,554 16,366  
INCOME (LOSS) BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 473,778 352,294 338,187  
Financial result, net (117,270) (74,301) (96,822)  
INCOME (LOSS) BEFORE TAXES 356,508 277,993 241,365  
Income and social contribution taxes (86,667) (123,552) (107,124)  
Net income (loss) 269,841 154,441 134,241  
Depreciation/amortization 88,537 155,038 182,672  
Investments in associates and jointly-controlled entities 701,233 584,898 404,522  
Total assets 4,421,487 5,208,265 5,582,926  
Total liabilities 1,053,007 1,711,963 1,651,590  
Operating Segments | Special Steel        
Segment reporting as per business segments        
Net sales 8,158,626 6,228,543 6,884,733  
Cost of sales (7,064,608) (5,301,172) (6,238,749)  
GROSS PROFIT 1,094,018 927,371 645,984  
Selling, general and administrative expenses (186,037) (166,656) (284,962)  
Other operating income (expenses) 10,081 14,989 14,166  
Equity in earnings of unconsolidated companies 15,629 15,460    
INCOME (LOSS) BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 933,691 791,164 375,188  
Financial result, net (112,109) (122,837) (148,313)  
INCOME (LOSS) BEFORE TAXES 821,582 668,327 226,875  
Income and social contribution taxes (191,386) (192,902) (64,348)  
Net income (loss) 630,196 475,425 162,527  
Depreciation/amortization 340,297 344,059 526,136  
Investments in associates and jointly-controlled entities 213,899 199,647    
Total assets 8,825,830 8,834,041 11,970,202  
Total liabilities 1,736,085 2,753,091 6,519,255  
Eliminations and Adjustments        
Segment reporting as per business segments        
Net sales (1,472,909) (1,332,767) (1,074,340)  
Cost of sales 1,494,727 1,331,544 1,073,906  
GROSS PROFIT 21,818 (1,223) (434)  
Selling, general and administrative expenses (168,438) (176,081) (244,302)  
Other operating income (expenses) (18,952) 47,882 43,951  
Results in operations with subsidiaries and associate company (414,507) (721,682) (58,223)  
Reversal of provision for tax liabilities, net   929,711    
Equity in earnings of unconsolidated companies 22,436 19,970 17,780  
INCOME (LOSS) BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES (557,643) 98,577 (241,228)  
Financial result, net (1,180,099) (335,629) (33,093)  
INCOME (LOSS) BEFORE TAXES (1,737,742) (237,052) (274,321)  
Income and social contribution taxes 1,082,552 (77,481) (279,800)  
Net income (loss) (655,190) (314,533) (554,121)  
Investments in associates and jointly-controlled entities 148,149 149,674 90,796  
Total assets 5,900,747 4,335,438 1,949,459  
Total liabilities 9,545,776 9,034,272 8,020,494  
Eliminations and Adjustments | Brazil        
Segment reporting as per business segments        
Net sales (1,280,770) (1,216,526) (885,050)  
Eliminations and Adjustments | North America        
Segment reporting as per business segments        
Net sales (84,335) (59,478) (90,267)  
Eliminations and Adjustments | South America        
Segment reporting as per business segments        
Net sales (4,988) (6,490) (6,386)  
Eliminations and Adjustments | Special Steel        
Segment reporting as per business segments        
Net sales R$ (102,816) R$ (50,273) R$ (92,637)