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.
ISO 9329-1/2/3/4 Seamless steel tubes for pressure purposes-technical delivery conditions
ISO 9305 Seamless steel tubes for pressure purposes -full peripheral ultrasonic testing for the detection of transverst imperfections
ISO 9304 Seamless and welded(except submerged arc-welded)steel tubes for pressure purposes -eddy current testing for the detection of imperfections
ISO 9303 Seamless and welded(except submerged arc-welded)steel tubes for pressure purposes-full peripheral ultrasonic testing for the detection of longitudinal imperfections
ISO 9302 Seamless and welded(except submerged arc-welded)steel tubes for pressure purposes-electromagnetic testing for verification of hydraulic leak-tightness
ISO 9095 Steel tubes-continuous character marking and colour coding for material identification
ISO 8535-1 Compression-ignition engines -steel tubes for high-pressure fuel injection pipes -requirements for seamless cold-drawn single-wall tubes
ISO 8535 Compression-ignition engines -steel tubes for high-pressure fuel injection pipes
ISO 8496 Metallic materials-tubes-ring tensile test
ISO 8180 Ductile iron pipes-polyethylene sleeving
ISO 8179-2 Ductile iron pipes-external zinc coating -zinc rich paint with finishing layer
ISO 8179-1 Ductile iron pipes-external zinc coating-metallic zinc with finishing layer
ADD：Chengnan Industrial Development Zone, Yanshan County, Hebei Province
Domestic phone number：0086-317-6689999
International call：0086-317-6165555
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