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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 239.2-2023 |
Metallic materials - wire rods - Part 2: Test methods for bidirectional torsion {译} 金属材料 线材 第2部分：双向扭转试验方法 |
China National Standards Bidirectional metal metal |
 English PDF |
| GB/T 37828-2019 |
Bidirectional metal to metal sealed butterfly valve for urban heating 城镇供热用双向金属硬密封蝶阀 |
China National Standards Bidirectional metal metal |
English PDF |
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