Liaocheng Alloy Steel Pipe Factory provides the latest standard knowledge of P91 alloy steel pipe according to GB/T8162-87 as follows:
4.1 Specifications: The outer diameter of hot rolled pipe is 32-630mm. Wall thickness 2.5 to 75mm. Cold-rolled (cold drawing) tube outer diameter 5 ~ 200mm. Wall thickness 2.5 to 12mm.
4.2 Appearance quality: There must be no cracks, folds, folds, separations, hairline and scarring defects on the inner and outer surfaces of the steel pipe. These defects should be completely removed, and the wall thickness and outer diameter must not be allowed to exceed the negative deviation after removal.
4.3. Both ends of the pipe should be cut at right angles and the burrs removed. Pipes with a wall thickness greater than 20 mm allow gas cutting and hot saw cutting. The agreement between supply and demand sides can also be undone.
4.4, cold drawn or cold rolled precision P91 alloy pipe "surface quality" with reference to GB3639-83.
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5, chemical composition test 5.1, according to chemical composition and mechanical properties of the domestic supply of P91 alloy pipe, such as 10,15,20,25,30,35,40,45 and 50 steel chemical composition should meet GB/T699-88 Provisions. The imported P91 alloy pipe was inspected according to the relevant standards stipulated in the contract. The chemical composition of 09MnV, 16Mn, 15MnV steel should meet the requirements of GB 1591-79.
5.2, specific analysis method Refer to GB223-84 "Steel and alloy chemical analysis method" of the relevant part.
5.3, analysis deviation Refer to GB222-84 "Steel chemical analysis of chemical composition and the allowable deviation of chemical composition of finished products."
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