12Cr1MoVG alloy steel pipe representation ① beginning of the two-digit number of the carbon content of steel, the average carbon content of the very few that, as 40Cr. ② major alloying elements in steel, in addition to individual micro-alloying elements, generally a few percent. When the average alloy content <1.5%, steel elements generally marked only symbols, not marked content, but prone to cause confusion, Jiangsu 1cr5mo alloy tube, in exceptional circumstances, after the element symbol can also be marked with the number '1' such as steel '12CrMoV' and '12Cr1MoV', the former chromium content of 0.4-0.6% 1cr5mo alloy pipe prices, the latter is 0.9-1.2%, and the remaining ingredients are all the same. When the average content of alloying elements ≥1.5%, ≥2.5%, while ≥3.5% ......, in the back of the element symbols should be marked content, can be expressed as the corresponding 2,3,4 ...... etc. For example 18Cr2Ni4WA. ③ vanadium steel V, Ti Ti, Al AL, boron B, rare earth RE alloying elements are micro-alloying elements, although very low levels, should bid out in steel. For example 20MnVB steel. Vanadium 0.07 to 0.12%, boron of 0.001 to 0.005%. ④ High quality steel should finally add 'A' in the steel, as distinct from the general high quality steel. Alloy pipe weight formula [(OD - Wall Thickness) * thickness] * 0.02466 = kg / m (weight per meter) welding materials for welding steel 15CrMoG work characteristics, based on past experience, to provide reference to foreign welding process card, we selected two schemes welding test. Program Ⅰ: welding preheat, using ER80S-B2L wire, T1G welding backing, E8018-B2 welding, SMAW cover up, local heat treatment after welding. Program Ⅱ: using ER80S-B2L wire, T1G welding backing 1cr5mo alloy pipe stock, E309Mo-16 electrodes, welding arc is filled cover up, no heat treatment after welding. Chemical composition and mechanical properties of wires and rods in Table 1. Shandong 1cr5mo alloy tube, Binzhou 1cr5mo alloy pipe, Pipe Co., Ltd. is provided by virtue of virtue Liaocheng pipe industry. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead virtue of Industry and you work into the brilliant, for a better future!