Along with the years of entrepreneurial journey of Zhongyuan people, she gradually formed her own spiritual pillar and behavioral norms. In the silent inheritance, she guided Zhongyuan Company towards a more brilliant tomorrow.
GB/T1591-2009 Pipe Chemical Composition for Requirements for the Results of Tensile Tests for
GB/T700 Pipe Chemical Composition for Requirements for the Results of Tensile Tests for
Steel Pipe for Fluid Service Standard and Classfication
Steel Pipe for Ordinary Structure Standard and Classfication
Line Pipe Standard and Classfication
Casing Standard and Classfication
GB/T3091 Standard outer diameter and wall thickness tolerances
GB/T9711.1 Standard outer diameter and wall thickness tolerances
GB/T9711.2 Standard outer diameter and wall thickness tolerances
SY/T5037 Tolerance of Outside Diameter and Wall Thickness of SSAW Steel Pipe
API 5L PSL1/PSL2 Tolerance of Outside Diameter and Wall Thickness of SSAW Steel Pipe
API 5CT Tolerance of Outside Diameter and Wall Thickness of SSAW Steel Pipe
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