GB/T 37622-2019 in English
VALIDHot rolled steel bar of fire resistant for the reinforcement of concrete
- Issued on:2019-06-04
- Implemented on:2020-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
《GB/T 37622-2019钢筋混凝土用热轧耐火钢筋》由TC183（全国钢标准化技术委员会）归口，TC183SC7（全国钢标准化技术委员会钢筋混凝土用钢分会）执行，主管部门为中国钢铁工业协会。
Introduction
GB/T 37622—2019 Standard Overview
GB/T 37622—2019 "Hot-rolled refractory steel bars for reinforced concrete" standard specifies the classification, brand, ordering content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of hot-rolled refractory steel bars for reinforced concrete. It is applicable to hot-rolled refractory plain round steel bars and hot-rolled refractory ribbed steel bars for reinforced concrete.
Comparison of standard frameworks
| Standard dimensions | GB/T 37622—2019 | International comparison | Industry specifications |
|---|---|---|---|
| Yield strength | 300MPa and above | ISO 16524-1:2017 | Industry average increased by 15% |
| Tensile strength | 420MPa and above | ASTM A615/A615M-19 | Meet EN 489-7 requirements |
| Elongation | ≥25% | UL 6091 | Meet GB/T 1499.2 standard |
Technical requirements and mechanical properties
Definition of fire-resistant steel bars: Steel with appropriate amount of fire-resistant alloy elements (such as Mo, Cr, Ni, Nb, V, etc.) added to make its yield strength at 600~°C not less than 2/3 of the value at room temperature. This property makes it an ideal choice for building structures in high temperature environments.
Grade and Chemical Composition
Rebars are divided into Grade 300, Grade 400 and Grade 500 according to yield strength. The grade composition is as follows:
| Category | Grade | Grade composition |
|---|---|---|
| Hot-rolled plain round fire-resistant steel bars | HPB300FR | Eigenvalue+FR |
| Hot-rolled ribbed fire-resistant steel bars | HRB400FR | HRB+yield strength eigenvalue+FR |
Mechanical properties
Under high temperature (600°C), the yield strength requirements of different grades of steel bars are as follows:
| Grade | Yield Strength Rpo.2/MPa |
|---|---|
| HPB300FR | ≥200 |
| HRB400FR | ≥270 |
| HRB500FR | ≥340 |
Test Methods and Inspection Rules
The standard specifies detailed test methods, including chemical composition analysis, tensile test, bending test and high temperature tensile test. For delivery inspection, each batch of steel bars needs to be fully tested for chemical composition, mechanical properties and process properties.
Implementation Recommendations
Purchasing and Application Recommendations:
- Choose a supplier of fire-resistant steel bars with formal certification to ensure that product quality meets the GB/T 37622-2019 standard.
- Fire-resistant steel bars should be used preferentially in construction projects with high temperatures or higher fire risks.
- Performance tests of steel bars are required before construction, including verification of yield strength and elongation at high temperatures.
Quality Control:
Construction units should establish a sound quality management system to ensure that the performance of fire-resistant steel bars is not damaged during storage, transportation and installation. It is recommended to conduct regular sampling inspections, especially in high-temperature construction environments.
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