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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 4437.2-2017 |
Aluminium and aluminium alloy extruded tubes—Part 2：Seam tubes 铝及铝合金热挤压管 第2部分：有缝管 |
China National Standards tubes—Part |
 English PDF |
| GB/T 34020.1-2017 |
Double wall copper-brazed steel tubes—Part 1:Tubing system for refrigerator 双层卷焊钢管 第1部分：冰箱管路系统用管 |
China National Standards tubes—Part |
English PDF |
| GB/T 34020.2-2017 |
Double wall copper-brazed steel tubes—Part 2:Tubing system for automobiles 双层卷焊钢管 第2部分：汽车管路系统用管 |
China National Standards tubes—Part |
English PDF |
| GB/T 34020.3-2017 |
Double wall copper-brazed steel tubes—Part 3: Tubing system for air conditioner and refrigeration 双层卷焊钢管 第3部分：空调和制冷设备管路系统用管 |
China National Standards tubes—Part |
English PDF |
| GB/T 4437.1-2015 |
Aluminium and aluminium alloy extruded tubes—Part 1: Seamless tubes 铝及铝合金热挤压管 第1部分：无缝圆管 |
China National Standards tubes—Part |
English PDF |
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