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| Chinese National Standard Category: Metallographic testing method |
| English Title: | Calculation of electron vacancy number in cast superalloys |
| Chinese Title: | 铸造高温合金电子空位数计算方法 |
| Standard No.: | GB/T 31309-2020 |
| Category No.: | H24 |
| Issued by: | SAMR; SAC |
| Issued on: | 2020-06-02 |
| Implemented on: | 2020-12-1 |
| Status: | to be superseded |
| Superseded by: | GB/T 25932-2025 Cast superalloy—Master alloys—Equiaxed crystal |
| Superseded on: | 2026-3-1 |
| Abolished on: | |
| Superseding: | GB/T 31309-2014 Calculation of electoron vacancy number in nickel-base superalloys |
| Word Count: | 6500 words |
| Similar Standards: |
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