Heat-resistant steel gas protection welding wire

Abstract

The invention relates to a heat resisting steel gas-shielded welding wire, which comprises the following chemical compositions by mass percent: smaller than or equal to 0.12 percent of C, 0.40-0.60 percent of Si, 0.60-1.50 percent of Mn, smaller than or equal to 0.025 percent of S, smaller than or equal to 0.025 percent of P, 1.20-1.50 percent of Cr, smaller than or equal to 0.20 percent of Ni, 0.45-0.65 percent of Mo, smaller than or equal to 0.35 percent of Cu, and residue of Fe. The heat resisting steel gas-shielded welding wire is used for the welding of chrome molybdenum steel in the manufacture of steel structures in power plants, the embrtittlement phenomenon of the weld metal in long-term use can be reduced, the obtained deposit metal and welded joint can be ensured to have sufficient creep strength, endurance strength and lasting plasticity and good high temperature structure stability; for the all-round properties, the obtained deposit metal has good match between strength and toughness, the yield strength is larger than or equal to 440 MPa, the tensile strength is larger than or equal to 550 MPa, and the specific elongation is larger than or equal to 20 percent.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to heat-resistant steel gas-shielded welding wire with tensile strength ≥ 550 MPa. Background technique [0002] Gas shielded welding has become a major efficient welding method for steel structure manufacturing. At present, it occupies a very high proportion in many manufacturing industries. With the upgrading of products in various industries, the technological content in the field of heat-resistant steel continues to increase. The requirements for materials and welded joints are more specific. What kind of performance the gas shielded welding wire has is directly related to the comprehensive performance and safety of the entire welding structure, such as mechanical properties, high temperature resistance, creep resistance and welding process performance. [0003] The use of several chromium-molybdenum steel welding wires in the national standard has the advantage of a wide range...

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Problems solved by technology

[0003] The use of several chromium-molybdenum steel welding wires in the national standard has the advantage of a wide range of applications, but the effect is not significant when used in specific fields. For the welding of chromium-molybdenum steel in the manufacture of steel structures in power stations, the molten metal obtained during the manufacturing process Parameters such as creep strength, durable strength, durable plasticity and high-temperature structural stability of metallized and welded joints are not ideal, and it is difficult to reduce the brittle phenomenon of weld metal in long-term use of power station equipment