GB13788-2024

Cold rolled ribbed steel bars

冷轧带肋钢筋

GB 13788-2024 est une norme nationale chinoise obligatoire en vigueur : Cold rolled ribbed steel bars. Secteur : Électronique. Thème principal : Sécurité des produits. Entrée en vigueur : 25 sept. 2024.

L’applicabilité dépend du périmètre du produit, de la voie de certification, des avis des autorités et des règles de transition. Demandez une traduction ou vérifiez la source avant d’utiliser cette fiche pour une décision de conformité.

Aperçu de conformité

Cet aperçu n’est actuellement disponible qu’en anglais.

Champ d’application

This standard applies to cold rolled ribbed steel bars used in ordinary reinforced concrete, welded mesh manufacturing, and prestressed concrete. It covers five grades: CRB550, CRB600H, CRB650, CRB800, and CRB800H. It is mandatory for manufacturers producing these specific steel bars for the Chinese market. It does not apply to hot-rolled ribbed steel bars.

Exigences techniques

The standard specifies the dimensions, shape, weight, and allowable deviations for cold rolled ribbed steel bars. It defines requirements for two-rib and three-rib configurations, including rib spacing, height, and relative rib area calculations. It outlines the mechanical and technological properties required for each grade, such as tensile strength, yield strength, elongation rates, and bending performance. Manufacturers must ensure the steel bars meet specific strength and ductility parameters. The standard also details surface quality requirements, prohibiting cracks, folds, scars, oil stains, and mechanical damage. Additionally, it specifies the raw material specifications in Appendix A, including chemical composition and mechanical properties for the hot-rolled wire rods used in production.

Méthodes d’essai

Testing methods include tensile tests conducted per GB/T 21839 and GB/T 28900, bending tests, and reverse bending tests. The standard also specifies procedures for stress relaxation tests under controlled environmental conditions. Dimensional measurements and weight deviation calculations are required to verify compliance with specified tolerances.

Questions fréquentes

What products are regulated under GB 13788-2024?

GB 13788-2024 regulates cold rolled ribbed steel bars used in reinforced concrete and prestressed concrete applications, including grades CRB550, CRB600H, CRB650, CRB800, and CRB800H.

What are the key changes in GB 13788-2024 compared to the 2017 version?

The 2024 version removes the CRB680H grade and four-sided rib shapes. It updates product specifications, raw material requirements, and delivery conditions. It also modifies elongation indicators for CRB550, CRB650, and CRB800, and updates marking requirements for steel grades.

Does GB 13788-2024 specify requirements for raw materials?

Yes, Appendix A of the standard specifies the chemical composition and mechanical properties of hot-rolled wire rods used as raw materials. It includes grades like CRW·Q235, CRW·20MnSi, and CRW·24MnTi.

The summary above provides a high-level overview of GB 13788-2024. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 13788-2024 today to access all detailed parameters, tables, and testing procedures.

Indications d’applicabilité

Type: Produit
CCS: H44
ICS: 77.140.15
Autorité compétente: Ministry of Industry and Information Technology
Comité technique: National Technical Committee on Steel of Standardization Administration of China

Relations

Remplace:GB/T 13788-2017