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Seamless steel tube used in oil cracking
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Seamless steel tube used in oil cracking
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Size deviation

   

Steel tube type

Steel pipe size

Allowable deviation

Hot rolled tube

      Outer diameter

≤ 159

± 1.00%

> 159

± 1.25%

Wall thickness

≤ 20

± 12.5%

> 20

± 10.0%

Cold drawn pipe

Outer diameter

≤ 30

± 0.20

30~50

± 0.30

> 50

± 0.8%

Wall thickness

≤ 3

+ 12%

- 10%

> 3

± 10%


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