GB/T 32255-2025 in English
VALIDGeneral martensitic stainless steel and alloy steel castings suitable for high temperature and high pressure service
- Issued on:2025-05-30
- Implemented on:2025-12-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$375.00
$364.00
$364.00
《GB/T 32255-2025高温承压马氏体不锈钢和合金钢通用铸件》由TC54（全国铸造标准化技术委员会）归口，TC54SC1（全国铸造标准化技术委员会铸钢分会）执行，主管部门为国家标准委。
Introduction
Main points of standard revision and technological evolution
| Revision items | 2015 edition | 2025 edition |
|---|---|---|
| Scope of application | Unspecified upper temperature limit | Specified use conditions of ≤620℃ |
| Heat treatment requirements | Provisions in Appendix A | Separate provisions in Chapter 5.3 of the main text |
| New grades | 11 types | 14 types (newly added ZG12Cr9Mo2CoNiVNbNB, etc.) |
Key material performance requirements
Typical grade ZG10Cr9MoV
The material still maintains the specified plastic elongation strength of 265MPa at a high temperature of 550℃. Its chemical composition requirements are:
- Cr content 8.00-9.50%
- V content 0.18-0.25%
- N/Al ratio ≥4
Key points of manufacturing process control
| Process link | Control requirements | Testing standards |
|---|---|---|
| Melt | AOD refining is required when Cr>5% | GB/T 20066 |
| Heat treatment | Normalizing/quenching temperature deviation ≤15℃ | GB/T 9452 |
| Welding repair | Major welding repair requires approval record | GB/T 40800 |
Implementation suggestions
- When selecting materials, refer to the domestic and foreign brand comparison table in Appendix B
- For ZG17Cr2Mo castings, it is recommended to control the tempering brittleness factor J≤180
- X-ray digital imaging (GB/T 39638) is preferred for radiographic inspection
Detection method system
| Detection items | Method standard | Key indicators |
|---|---|---|
| Chemical composition | GB/T 223 series | 23 elements detection methods |
| High temperature tensile | GB/T 228.2 | 200-620℃ performance curve |
| Ultrasonic testing | GB/T 7233.2 | Level 1 acceptance of weld end area |
Sample only — not a preview of GB/T 32255-2025
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