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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| Status: | to be superseded |
| Superseded by: | GB/T 25932-2025 Cast superalloy—Master alloys—Equiaxed crystal |
| Superseded on: | 2026-3-1 |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: | GB/T 34474-2025 GB/T 46224-2025 GB/T 1979-2025 GB/T 4236-2025 GB/T 3488.1-2024 GB/T 23603-2024 GB/T 18876.2-2024 GB/T 18876.1-2024 GB/T 13305-2024 GB 3310-1982 GB/T 2108-1980 YB 45-1977 GB 11259-1989 JB 1582-1985 GB/T 10561-2023 GB/T 30834-2022 GB/T 13299-2022 GB/T 41080-2021 GB/T 40404-2021 GB/T 40304-2021 |
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