Standard: GB/T19001-2016 idt ISO9001:2015 Number: HB250Q00090R0S Issue Date: 2025-12-18 Expiry Date: 2028-12-17 Scope/Range: Sales of metal material products and mechanical parts (IAF Code: 29) Issued By: Haobo Jiangsu Certification Co.,Ltd

Standard: Q/WXSN001-2021 Number: WXSNYSCYFS242172 Issue Date: 2025-11-20 Expiry Date: 2028-11-19 Scope/Range: Enterprise Credit Rating Certificate Issued By:

Standard: Q/WXNS001-2021 Number: WXNSYTSCFSZ4181 Issue Date: 2025-11-20 Expiry Date: 2028-11-19 Scope/Range: Quality Oriented And Trustworthy Enterprise Issued By:

Standard: CERTIFICATE OF WORKS APPROVAL Number: QD22PWA00052 Issue Date: 2023-05-18 Expiry Date: 2027-05-18 Scope/Range: Stainless Steel Pipes and Tubes Issued By: CHINA CLASSIFICATION SOCIETY

Standard: API Spec Q1, 10th Edition Number: Q1-2445 Issue Date: 2025-05-29 Expiry Date: 2027-06-11 Scope/Range: Design of Materials used for Hot-Rolling Alloy Steel Seamless Steel Pipes; Design of Premium Connections used for Casing and Tub Issued By: American Petroleum Institute