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.
DIN 2444 Zinc coating on steel tubes,quality standard for hot dip galvanizing of steel tubes for installation purposes
DIN 2442 Steel tubes of specified quality suitable for screwing;nominal pressure 1 to 100
DIN 2441 Steel tubes heavy-weight suitable for screwing
DIN 2440 Steel tubes medium-weight suitable for screwing
DIN 2413-1/2 Design of steel pressure pipes
DIN 4922-1 Steel filter pipes for drilled wells with slot perforation and fisching (butt strap joint)
DIN 4427 Steel tubes for falsework and working scaffolds-requirements,tests (german version)
DIN 2999-1/6 Pipe threads for tubes and fitings
DIN 2917 Seamless steel tubes for superheated steam pipelines and headers
DIN 2916 Bending radi for seamless and welded steel tubes-design sheet
DIN 2614 Cement mortar linings for ductile iron and steel pipes and fitings-application,requirements and testing
DIN 2559 Edge preparation for welding -weld preparation inside diameter of steel pipes
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