GB/T 41157.1-2022 in English
VALIDFasteners for nuclear power plants—Part 1：Bolts, screws and studs made of alloy steel
- Issued on:2022-03-09
- Implemented on:2022-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
$466.00
| Standard No: | GB/T 41157.1-2022 |
| Document status: | VALID |
| Title in English: | Fasteners for nuclear power plants—Part 1：Bolts, screws and studs made of alloy steel |
| Title in Chinese: | 核电厂用紧固件 第1部分：合金钢螺栓、螺钉和螺柱 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2022-03-09 |
| Implemented on: | 2022-10-01 |
| ICS Classification: | 21.060.10-Bolts, screws, studs |
| Chinese Classification: | J13-Fastener |
| Professional Classification: | GB-National Standard |
| Related Keywords: | nuclear power plants part
nuclear power plants grade 1-3 alloy steel fasteners alloy steel introduction interpretation alloy steel materials |
| Related Topics: | alloy steel screw
alloy steel screw stud nuclear power plant nb Alloy Steel Bolts GB/T 41157.1 GB/T 41157.1-2022 Bolts, Screws and Studs bolts, screws, studs China Nuclear Power Nuclear power fasteners |
《GB/T 41157.1-2022核电厂用紧固件 第1部分：合金钢螺栓、螺钉和螺柱》由TC85（全国紧固件标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Interpretation of the core content of the standard
GB/T41157.1-2022 proposes full life cycle technical requirements for grade 1-3 alloy steel fasteners in pressurized water reactor nuclear power plants, applicable to bolts, screws and studs of specifications M5-M64, with an upper limit of operating temperature of 370°C.
Key technical requirements
Material specifications
The standard recommends four types of alloy steel materials, including 42CrMo, 40CrMoV, etc., whose chemical composition must meet the requirements of the smelting analysis in Table 1, and the carbon content is controlled at 0.35%-0.48%.
| Test items | Level 1 requirements | Level 2 requirements | Level 3 requirements |
|---|---|---|---|
| Tensile strength at room temperature (MPa) | 865-1040 | 895-1034 | 825-1034 |
| 350℃ yield strength (MPa) | ≥570 | ≥570 | ≥570 |
| Impact energy (-12℃,J) | ≥34 | ≥34 | ≥41 |
Test method system
Key test comparison
The standard establishes a three-level test system:
- Finished product test: wedge load test (7.4), guaranteed load test (7.5)
- Material test: machined specimen tensile (7.1), impact (7.9)
- Special inspection: magnetic particle/penetrant inspection (7.11), grain size inspection (7.8)
Non-destructive testing requirements
100% surface inspection for M24 specifications:
- Magnetic particle testing: in accordance with NB/T20003.5
- Ultrasonic testing: bars shall be accepted in accordance with NB/T20003.2 Level II
Implementation suggestions
Hydrogen embrittlement risk control
For fasteners with hardness>32HRC (tensile strength>1000MPa), the standard recommends taking special measures:
- Add a dehydrogenation process after phosphating
- Extend the aging treatment time
- Use low hydrogen electroplating process
Quality traceability requirements
Mandatory marking requirements stipulated by the standard:
- Hexagonal head products: manufacturer code + material code marked on the top/side of the head
- Studs: material code marked on the unthreaded rod
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