15CrMo 6 * 1500 * 6000 Steel / New Steel 15CrMo 8 * 1500 * 6000 Steel / New Steel 15CrMo 10 * 1800 * 8000 Steel / New Steel 15CrMo 12 * 1800 * 8000 Steel / New Steel 15CrMo 14 * 1800 * 8000 Steel / New Steel 15CrMo 16 * 1800 * 8000 Steel / New Steel 15CrMo 20 * 1800 * 8000 Steel / New Steel 15CrMo 25 * 1800 * 8000 Steel / New Steel 15CrMo 30 * 1800 * 8000 Steel / New Steel 15CrMo 35 * 1800 * 8000 Steel / New Steel 15CrMo 40 * 1800 * 8000 Steel / New Steel 15CrMo 50 * 1800 * 8000 Steel / New Steel 15CrMo 15CrMo steel plate pearlite structure-based heat-resistant steel, high temperature with high heat resistance (δb≥440MPa) and antioxidant resistance, and has some resistance to hydrogen corrosion. Because the steel contains a higher content of Cr, C and other alloying elements, hardened steel tendency is obvious, poor welding. 15CrMo welding welding materials for welding steel 15CrMo work characteristics, based on past experience, referring to the welding process card provided from abroad, we have chosen two options for welding tests. Program Ⅰ: welding preheating, use ER80S-B2L wire, T1G welding backing, E8018-B2 welding, SMAW cover up, local heat treatment after welding. Program Ⅱ: adopt ER80S-B2L wire, T1G welding backing, 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. 15CrMo steel welding thick-walled high-pressure pipe welding using two programs are feasible. In order to ensure that the weld performance matched with the base metal and has a high heat resistance, Ⅰ better use of the program, the key is to strictly control the weld heat treatment process. After the program, although Ⅱ weld heat treatment may be omitted, but the migration and diffusion welding of carbon at high temperatures resulting in the possibility of weld failure can not be ignored, so only the post-weld heat treatment can not be careful when using. 15crmo steel weight formula: length × width × thickness × 0.00785 = kg / m chemical composition and mechanical properties mechanical properties Chemical composition (mass fraction) (%) C Mn Si Cr Mo Ni Nb + Ta SP 15CrMo 0.12 ~ 0.18 0.40 ~ 0.70 0.17 ~ 0.37 0.80 ~ 1.10 0.40 ~ 0.55 ≤0.30 _ ≤0.035 ≤0.035 Mechanical Properties Grade Tensile Strength MPa MPa yield point elongation (%) 15CrMo 440 ~ 640 235 21 Application examples petroleum, petrochemical, high-pressure boiler, special purpose The seamless boiler seamless pipe, seamless steel pipe and oil geology seamless pipe and other.