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IMPAIRMENT OF ASSETS (Details)
R$ in Thousands
12 Months Ended
Dec. 31, 2023
BRL (R$)
segment
Dec. 31, 2022
BRL (R$)
Dec. 31, 2021
BRL (R$)
Impairment of assets      
Impairment of property, plant and equipment R$ 0 R$ 0 R$ 0
Number of operating segments | segment 4    
Impairment of goodwill R$ 0 R$ 0 R$ 0
Period for projecting the cash flows for the goodwill impairment test five years    
Discount rate | Sensitivity analysis, increase of 5%      
Impairment of assets      
Sensitivity analysis, percent of increase 0.50% 0.50%  
Perpetuity growth rate | Sensitivity analysis, decrease of 5%      
Impairment of assets      
Sensitivity analysis, percent of decrease 0.50% 0.50%  
North America      
Impairment of assets      
Book value in the Brazil segment R$ 6,432,000 R$ 10,426,000  
Recoverable amount exceeding other segments 4,213,000 7,116,000  
North America | Discount rate | Sensitivity analysis, increase of 5%      
Impairment of assets      
Book value in the Brazil segment R$ 5,075,000 R$ 8,749,000  
North America | Post-tax discount rates      
Impairment of assets      
Discount rate 10.25% 9.75%  
North America | Pre-tax discount rates      
Impairment of assets      
Discount rate 12.99% 12.28%  
North America | Perpetuity growth rate      
Impairment of assets      
Growth rate 3.00% 3.00%  
North America | Perpetuity growth rate | Sensitivity analysis, decrease of 5%      
Impairment of assets      
Book value in the Brazil segment R$ 5,431,000 R$ 9,161,000  
Special Steel      
Impairment of assets      
Book value in the Brazil segment 2,832,000 5,299,000  
Recoverable amount exceeding other segments 1,578,000 3,442,000  
Special Steel | Discount rate | Sensitivity analysis, increase of 5%      
Impairment of assets      
Book value in the Brazil segment R$ 2,067,000 R$ 4,329,000  
Special Steel | Post-tax discount rates      
Impairment of assets      
Discount rate 11.00% 10.75%  
Special Steel | Pre-tax discount rates      
Impairment of assets      
Discount rate 14.04% 13.81%  
Special Steel | Perpetuity growth rate      
Impairment of assets      
Growth rate 3.00% 3.00%  
Special Steel | Perpetuity growth rate | Sensitivity analysis, decrease of 5%      
Impairment of assets      
Book value in the Brazil segment R$ 2,271,000 R$ 4,586,000  
South America      
Impairment of assets      
Book value in the Brazil segment 749,000 1,074,000  
Recoverable amount exceeding other segments 614,000 831,000  
South America | Discount rate | Sensitivity analysis, increase of 5%      
Impairment of assets      
Book value in the Brazil segment R$ 657,000 R$ 953,000  
South America | Post-tax discount rates      
Impairment of assets      
Discount rate 19.00% 18.00%  
South America | Pre-tax discount rates      
Impairment of assets      
Discount rate 28.44% 26.47%  
South America | Perpetuity growth rate      
Impairment of assets      
Growth rate 3.00% 3.00%  
South America | Perpetuity growth rate | Sensitivity analysis, decrease of 5%      
Impairment of assets      
Book value in the Brazil segment R$ 702,000 R$ 1,011,000  
Brazil      
Impairment of assets      
Book value in the Brazil segment 1,678,000 3,632,000  
Amount by which units recoverable amount is below of its carrying amount 501,000 1,357,000  
Brazil | Discount rate | Sensitivity analysis, increase of 5%      
Impairment of assets      
Book value in the Brazil segment R$ 343,000 R$ 2,306,000  
Brazil | Post-tax discount rates      
Impairment of assets      
Discount rate 11.75% 11.75%  
Brazil | Pre-tax discount rates      
Impairment of assets      
Discount rate 15.06% 15.56%  
Brazil | Perpetuity growth rate      
Impairment of assets      
Growth rate 3.00% 3.00%  
Brazil | Perpetuity growth rate | Sensitivity analysis, decrease of 5%      
Impairment of assets      
Book value in the Brazil segment R$ 719,000 R$ 2,673,000