GB1499.1-2024

Steel for the reinforcement of concrete—Part 1:Hot rolled plain bars

钢筋混凝土用钢第1部分：热轧光圆钢筋

GB 1499.1-2024 é uma norma nacional chinesa obrigatória vigente: Steel for the reinforcement of concrete—Part 1:Hot rolled plain 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 specifies the requirements for hot rolled plain bars (steel bars) used in concrete reinforcement. It applies to both straight bars and coils supplied in nominal diameters ranging from 6mm to 25mm. This standard is mandatory for all manufacturers producing steel reinforcement for the Chinese construction market. It explicitly excludes recycled steel bars made by re-rolling finished steel products.

Requisitos técnicos

The standard outlines the technical specifications for the HPB300 grade, which features a characteristic yield strength of 300 MPa. It mandates specific requirements for the chemical composition (melting analysis) of the steel, including upper limits for carbon, silicon, manganese, phosphorus, and sulfur. Mechanical and technological properties are strictly defined, requiring minimum guarantees for lower yield strength, tensile strength, elongation, and maximum force total elongation. The bars must also withstand a 180-degree bend test without surface cracking. Dimensional and weight criteria include strict tolerances for diameter, out-of-roundness, and the allowable deviation between actual and theoretical weights. Manufacturers must ensure all surface defects are non-harmful, and criteria for packaging, marking, and quality certificates are also specified in accordance with referenced standards like GB/T 2101.

Métodos de ensaio

Testing procedures encompass chemical composition analysis, tensile testing, and bending tests, primarily following the methodologies outlined in GB/T 28900. Dimensional measurements require precision up to 0.1mm, and weight deviation testing involves measuring the total mass of multiple samples with a precision of 1g. The standard also details statistical evaluation methods for characteristic value inspection, utilizing parameter and attribute testing based on sample batches.

Perguntas frequentes

What products are regulated under GB 1499.1-2024?

It applies to hot rolled plain bars (steel bars) used for the reinforcement of concrete, supplied as straight bars or in coils. It explicitly excludes recycled steel bars made by re-rolling finished steel products.

Are there any significant updates from the previous GB/T 1499.1-2017 version?

The 2024 version is now a mandatory national standard (transitioning from the previously recommended GB/T 1499.1-2017). Key updates include the addition of the 25mm nominal diameter size, changes to the nominal diameter range, updated weight tolerance parameters, and revised rules for mixed batches and packaging.

What steel grades are specified in this standard?

The standard specifies a single grade, HPB300, which indicates a hot rolled plain bar with a characteristic yield strength value of 300 MPa.

The summary above provides a high-level overview of GB 1499.1-2024. 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 1499.1-2024 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 1499.1-2017