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6-K

Gerdau S.A. (GGB)

6-K 2024-09-10 For: 2024-09-10
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Added on April 11, 2026

U.S. SECURITIES AND EXCHANGE COMMISSION

Washington**,D.C. 20549**

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE

SECURITIESEXCHANGE ACT OF 1934

Dated September 10, 2024

Commission File Number 1-14878

GERDAU S.A.

(Translation of Registrant’s Name into English)

Av. Dra. Ruth Cardoso, 8,501 – 8° andar

São Paulo, São Paulo - Brazil CEP 05425-070

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F x Form 40-F ¨

Exhibit Index

Exhibit Description<br> of Exhibit
99.1 Notice<br> to the Market, September 9, 2024

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date:  September 10, 2024

GERDAU S.A.
By: /s/<br> Rafael Dorneles Japur
Name: Rafael Dorneles Japur
Title: Executive Vice President
Investor Relations Director

Exhibit 99.1

GERDAU S.A.

Corporate Tax ID (CNPJ/MF): 33.611.500/0001-19

Registry (NIRE): 35300520696

NOTICE TO THE MARKET

GerdauS.A. (B3: GGBR / NYSE: GGB) announces to its shareholders and the general market that alongside Petroleo Brasileiro S.A. - Petrobras, has started working under a non-binding Memorandum of Understanding with a term of 2 (two) years , and the goal of pursuing commercial opportunities and potential partnerships on decarbonization projects; low carbon fuels; hydrogen and its coproducts; carbon capture, utilization and storage (CCUS); as well as R&D projects regarding the integrity of materials in marine environment and natural gas powered "direct reduction" steelmaking.

Gerdau has a distinguished position in the global steel industry with one of the lowest Greenhouse Gas emissions, currently at 0.91 tCO2e per ton of steel, which represents approximately half of the global industry average and has the goal of reaching 0.82 tCO2e per ton of steel by 2031.

This partnership contributes to the development of technology and initiatives that aim to enable a low carbon economy, creating new paths for the decarbonization of the steel industry.

São Paulo, September 9^th^, 2024.

RafaelDorneles Japur

Executive Vice-President and

Investor Relations Officer