High-strength heat-resistant steel gas shielded solid welding wire

Abstract

The invention discloses a high-strength heat-resistant steel gas-shielded solid wire. The solid wire comprises, by mass, 0.10-0.15% of C, 1.75-2.20% of Mn, 0.85-0.95% of Si, S<=0.015%, P<=0.015%, Cu<=0.20%, 0.30-0.60% of Cr, 1.50-2.50% of Ni, 1,40-1,50% of Mo, 0.05-0.20% of V, 0.02-0.05% of Ti, 0.05-0.15% of Al, 0.04-0.20% of Nb and the balance Fe. Deposited metal and welded joints obtained through the wire can reduce embrittlement during long-term usage and are provided with good comprehensive performance, structure stability, heat resistance and good strengthens and toughness matching of high-strength steel structures are provided, good welding processing properties are provided, the wire feeding is smooth, splashing is small during a welding process, and the molding is attractive in appearance; the solid wire is particularly suitable for welding pressure vessels with heat resistance and toughness requirements; and the comprehensive performance of the obtained deposited metal includes: the yield strength>=600MPa, the tensile strength>=700MPa, the elongation>=20%, and the impact toughness Akv>=60J under the room temperature condition.

Description

technical field [0001] The invention relates to a high-strength heat-resistant steel gas-shielded solid welding wire, which belongs to the field of welding materials, in particular to a heat-resistant steel gas-shielded welding wire with a tensile strength ≥ 700 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 mangane...

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Problems solved by technology

[0003] The use of several manganese-nickel-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. The parameters such as creep strength, durable strength, durable plasticity and high-temperature structural stability of the deposited metal and welded joints are not ideal, and it is difficult to reduce the embrittlement of the weld metal in the long-term use of power station equipment

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