GB/T 20671.5-2020 in English
VALIDClassification system and test methods for nonmetallic gasket materials—Part 5: Standard test method for creep relaxation of gasket materials
- Issued on:2020-06-02
- Implemented on:2021-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$175.00
《GB/T 20671.5-2020非金属垫片材料分类体系及试验方法 第5部分：垫片材料蠕变松弛率试验方法》由TC406（全国非金属矿产品及制品标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
Analysis of the core content of the standard
This part specifies the method for determining the stress loss of non-metallic gasket materials under compression over time, including two test systems: strain display and micrometer assembly.
Comparison of old and new standards
| Technical elements | GB/T20671.5-2006 | GB/T20671.5-2020 |
|---|---|---|
| Scope of application | Material type is not clearly defined | Clearly applicable to 1/5/7 type materials |
| Test method B | Micrometer indicator components are not specified | New micrometer indicator accuracy requirements (≤0.0025mm) |
| Calculation formula | Parameter description is incomplete | Supplement the definition of parameters in formula (1) |
Key technical points
Test method A (strain measurement method)
Use resistance strain gauge to monitor bolt deformation, key control points:
- Initial stress: 13.8MPa±0.3MPa
- Loading time: completed within 10s±2s
- Data recording: 10s→1min→6min→30min→1h→5h→24h segmented collection
Test method B (displacement measurement method)
Applicable to high temperature environment testing, characteristic parameters:
- Loading speed: reach 26.7kN load within 3s
- Typical elongation: 0.1222mm-0.1270mm
- Temperature range: chrome-molybdenum steel ≤204.4℃, nickel-based alloy ≤482.2℃
Implementation suggestions
- Sample preparation: Rectangular samples must be used for type 1 materials, and ring samples can be used for other types
- Equipment calibration: New bolts require 7 pretreatment cycles until the displacement difference is ≤3%
- Precision control: The coefficient of variation of type 7, class 2 materials should be controlled within 11.8%
- Temperature compensation: After high temperature testing, the dial gauge data must be read after cooling to room temperature
Technology evolution analysis
The 2020 version of the standard strengthens the high-temperature testing capability by adding a nickel-based alloy material option (see Appendix B), raising the maximum test temperature from the conventional room temperature of the 2006 version to 482.2°C, which is more suitable for the evaluation of high-temperature sealing materials in modern industry.
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