12Cr1MoV and differences 12Cr1MoVg: The national standards are q345 small diameter steel pipe, 12Cr1MoV is common steel, and steel q345b 12Cr1MoVg professional small-diameter steel pipe, namely pressure vessel steel, where g is the boiler pot Pinyin initials, slightly different chemical composition. 12Cr1MoV and 12Cr1MoVg12Cr1MoVg chemical composition: C0.08 ~ 0.15, Si0.17 ~ 0.37, Mn0.40 ~ 0.70, Mo 0.25 ~ 0.35, Cr0.90 ??~ 1.20, V 0.15 ~ 0.30.12Cr1MoV chemical composition of: C: 0.07 ~ 0.15, Si: 0.18 ~ 0.37, Mn: 0.41 ~ 0.70, Cr: 0.90 ~ 1.20, Mo: 0.25 ~ 0.35, V: national standard steel pipe knowledge of relevant national standards 1. Structure 0.15 to 0.30 seamless steel seamless pipe ( GB / T8162-1999) is used for seamless steel tubes for general structural and mechanical structure. 2 fluid seamless steel pipe (GB / T8163-1999) is generally seamless for conveying water, oil, gas and other fluids. 3. The low-pressure boiler seamless steel pipe (GB3087-1999) is used in the manufacture of various structural low and medium pressure boiler superheated steam pipes, boiling water pipes and superheated steam locomotive boiler tubes, opium pipe, small pipe and brick arch effective high-quality carbon structural steel hot-rolled and cold drawn (rolled) seamless steel pipe. 4. High-quality carbon steel high-pressure boiler seamless pipe (GB5310-1995) is used to manufacture high-pressure and more pressure water tube boiler heating surface with steel, alloy steel and heat-resistant stainless steel seamless steel tubes. 5. fertilizer equipment, high pressure seamless steel pipe (GB6479-2000) is applicable to operating temperature -40 ~ 400 ℃, working pressure of high-quality carbon structural steel and alloy steel 10 ~ 30Ma of chemical equipment and seamless steel pipes. 45 # of small diameter steel pipe, pipe industry virtues (certified), small-diameter steel pipe Ltd. Zhenjiang by virtue Liaocheng Pipe. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) Shandong Liaocheng, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Industry leaders in the United States and Germany with the staff warmly welcome all inquiries negotiations to create the virtues pipe industry a better future.