v3.26.1
INTANGIBLE ASSETS (Tables)
12 Months Ended
Dec. 31, 2025
Notes and other explanatory information [abstract]  
Schedule of intangible assets
                               
                                Consolidated
    Ref.   Goodwill   Customer relationships   Software   Trademarks
and
patents
  Rights and licenses
(*)
  Others   Total
Balance at December 31, 2023        4,126,255    85,276   17,708   213,997    6,090,962   2,283   10,536,481
 Cost         4,675,302    718,929    276,617   217,560    6,431,706   2,283   12,322,397
 Accumulated amortization         (549,047)   (633,653)   (258,909)    (3,563)    (340,744)       (1,785,916)
Balance at December 31, 2023        4,126,255   85,276   17,708   213,997    6,090,962   2,283    10,536,481
Effect of foreign exchange differences           4,748    504   36,655           41,907
Acquisitions               2,956                2,956
Transfer between groups - fixed assets               70,819        3,644       74,463
Write-offs               (798)                (798)
Amortization            (49,785)    (26,975)    (4)    (141,446)        (218,210)
Transfers to other asset categories               49,786    1,780    (51,566)        
Others                        1,292        1,292
Balance at December 31, 2024        4,126,255    40,239    114,000   252,428    5,902,886   2,283   10,438,091
 Cost         4,675,302    858,748    389,604   256,085    6,384,805   2,283   12,566,827
 Accumulated amortization         (549,047)   (818,509)   (275,604)    (3,657)    (481,919)       (2,128,736)
Balance at December 31, 2024        4,126,255    40,239    114,000   252,428    5,902,886   2,283   10,438,091
 Effect of foreign exchange differences             15    37   734   262       1,048
 Acquisitions                2,977               2,977
 Transfer between groups - fixed assets                45,190               45,190
 Amortization    28        (9,669)    (36,325)    (17)    (144,393)        (190,404)
 Transfers to other asset categories            (13,715)   21,300   339    (5,652)    (2,272)    
 Acquisition of stakes in subsidiaries        653,074   8,247   1,044   45,280           707,645
 Others                        1,578       1,578
Balance at December 31, 2025        4,779,329    25,117    148,223   298,764    5,754,681    11   11,006,125
 Cost         5,328,376    881,322    436,871   302,347    6,383,219    11   13,332,146
 Accumulated amortization         (549,047)   (856,205)   (288,648)    (3,583)    (628,538)       (2,326,021)
Balance at December 31, 2025        4,779,329    25,117    148,223   298,764    5,754,681    11   11,006,125
(*) Composed mainly of: (i) mining rights amortized by production volume and (ii) Concession contract for hydroelectric resource utilization in acquiring control of Companhia Estadual de Geração de Energia Elétrica- CEEE-G, with amortization performed over the contract's term.
Schedule of goodwill impairment test
                           
                            Consolidated
        Goodwill Trademarks Total
Cash generating unity   Segment   12/31/2025   12/31/2024   12/31/2025   12/31/2024   12/31/2025   12/31/2024
             
Packaging (1)    Steel    170,163   170,163          170,163   170,163
Long steel (2)    Steel    235,595   235,595   218,614   217,538    454,209   453,133
Mining (3)    Mining     3,236,402   3,236,402         3,236,402   3,236,402
Cements (4)    Cement    468,870   468,870    34,835   34,822    503,705   503,692
Road logistics(5)    Logistics    613,911              613,911    
Services(6)    Others    54,388   15,225          54,388   15,225
         4,779,329   4,126,255   253,449   252,360   5,032,778   4,378,615
(1) Acquisition of CBL Group in 2011 and Metalgráfica Iguaçu in 2022 by Prada
(2) Acquisition of Stahlwerk Thuringen GmbH (“SWT”) and Gallardo Sections in 2012 by CSN
(3) Acquisition of Namisa in 2015 by CSN Mineração
(4) Acquisition of Elizabeth Cimentos S.A. in 2021 and CSN Cimentos Brasil S.A in 2022 by CSN
(5) Transaction related to the acquisition of participation in the Estrela Comércio e Participações S.A Group (see note 3)
(6) Acquisition of CBSI in 2019 by CSN and Global Dot (see note 3).
Schedule of average estimated useful lives
     
      Consolidated
  12/31/2025   12/31/2024
Software 8   8
Customer relationships 13   13