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 3304 Plain end seamless precision steel tubes -technical conditions for delivery
ISO 3183-3 Petroleum and natural gas industries -steel pipe for pipelines -technical delivery conditions-pipes of requirement class C
ISO 3183-2 Petroleum and natural gas industries -steel pipe for pipelines -technical delivery conditions-pipes of requirements class B
ISO 3183-1 Petroleum and natural gas industries -steel pipe for pipelines -technical delivery conditions-pipes of requirement class A
ISO 3138 Anhydrous hydrogen fluoride for industrial use-determination of non volatile acid content -titrimetric method
ISO 2938 Hollow steel bars for machining
ISO 2937 Plain end seamless steel tubes for mechanical application
ISO 2604-6 Steel products for pressure purposes-quality requirements-submerged arc longitudinally or spirally weldec steel tubes
ISO 2604-5 Steel products for pressure purposes-quality requirements-longitudinally welded austenitic stainless steel
ISO 2604-1 Steel products for pressure purposes-quality requirements-forging
ISO 2604-1 to 8 Steel products for pressure purposes-quality requirements
ISO 2531 Ductile iron pipes,fittings,accessories for pressure pipelines
ADD：Chengnan Industrial Development Zone, Yanshan County, Hebei Province
Domestic phone number：0086-317-6689999
International call：0086-317-6165555
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