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.
NORTH AMERICA ANSI American National Standards Institute USA
NORTH AMERICA AWWA American Water Works Association USA
NORTH AMERICA ASTM American Society for Testing and Materials USA
What is API?
What is ISO？
ISO 13665 Seamless and welded steel tubes for pressure purposes -magnetic particle inspection of the tube body for the detection of surface imperfections
ISO 13664 Seamless and welded steel tubes for pressure purposes -magnetic particle inspection of the tube ends for the detection of laminar imperfections
ISO 13663 Welded steel tubes for pressure purposes-ultrasonic testing of the area adjacent to the weld seam for the detection of laminar imperfections
ISO 12096 Submerged arc-welded steel tubes for pressure purposes-radiographic testing of the weld seam for the detection of imperfections
ISO 12095 Seamless and welded steel tubes for pressure purposes-liquid penetrant testing
ISO 12094 Welded steel tubes for pressure purposes-ultrasonic testing for the detection of laminar imperfections in strips/plates used in the manufacture of welded tubes
ISO 11961 Petroleum and natural gas industries-steel pipes for use as drill pipe-specification
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