51 steel pipe network introduced the compactness and surface roughness of steel pipe

According to the requirements of the buyer, the compactness is negotiated between the supplier and the buyer, and it is stated in the contract that the steel pipe can be compacted after the cold working, stress relief annealing (BKS), annealing (GBK), and normalized (NBK) status. test. The test of compactness shall be carried out by eddy current inspection in accordance with the provisions of acceptance class A of GB/T 7735.
Surface roughness When the demand side has a roughness requirement on the surface of the steel pipe, it should be specified in the contract. The surface roughness parameters are determined according to the arithmetic average deviation Ra of the outline specified in GB/T1031. The surface roughness value and the sampling length value during the measurement are negotiated by the supply and demand sides.

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