GB13788-2024

Cold rolled ribbed steel bars

冷轧带肋钢筋

GB 13788-2024 é uma norma nacional chinesa obrigatória vigente: Cold rolled ribbed steel bars. Setor: Eletrônicos. Foco: Segurança de produtos. Entrada em vigor: 25 de set. de 2024.

A aplicabilidade depende do escopo do produto, da via de certificação, dos avisos da autoridade competente e das regras de transição. Solicite uma tradução ou verifique a fonte antes de usar este registro em uma decisão de conformidade.

Visão geral de conformidade

Esta visão geral está disponível por enquanto apenas em inglês.

Escopo e aplicabilidade

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.

Requisitos técnicos

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.

Métodos de ensaio

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.

Perguntas frequentes

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.

Indicações de aplicabilidade

Tipo: Produto
CCS: H44
ICS: 77.140.15
Órgão competente: Ministry of Industry and Information Technology
Comitê técnico: National Technical Committee on Steel of Standardization Administration of China

Relações

Substitui:GB/T 13788-2017