Gas protection welding wire and manufacturing method thereof

Abstract

The invention discloses a gas protection welding wire which comprises, by mass, 0.06-0.15% of C, 0.15-0.50% of Si, 0.5-2.0% of Mn, 8.5-10% of Cr, 0.4-0.8% of Ni, 0.8-1.2% of Mo, 0.10-0.30% of V, 0.02-0.08% of Nb, greater than 0 and smaller than or equal to 0.05% of Al, 0.02-0.07% of N, and the balance being iron and other inevitable impurities. In addition, the invention further discloses a manufacturing method of the gas protection welding wire, comprising the steps: (1), smelting and casting; (2), making a square billet; (3) rolling to obtain a wire rod; (4) wire rod annealing, wherein the annealing temperature is 805-835 DEG C; and (5) rolling or drawing to obtain the gas shielded welding wire. The tensile strength of deposited metal obtained by welding by the gas shielded welding wireis greater than or equal to 600 MPa, and the elongation is greater than or equal to 17 percent.

Description

Technical field [0001] The invention relates to a welding wire and a manufacturing method thereof, in particular to a gas shielded welding wire and a manufacturing method thereof. Background technique [0002] With the increasing demand for energy in industry and residents' lives, the working coefficient and thermal efficiency of power station boilers are gradually increasing. Countries all over the world are vigorously developing ultra-supercritical power station boilers, which put forward higher requirements for boiler pressure components. 9Cr-1Mo steel (T / P91 steel for short) is a ferritic heat-resistant stainless steel with excellent high-temperature performance. The performance is between 2.25Cr-1Mo (T22 / P22) low alloy steel and austenitic stainless steel. It can be used as the steam pipe of the supercritical pressure unit of nuclear power plant (the wall temperature can be up to 650℃, and the steam pressure is above 240 atmospheres). This kind of steel pipe has been put in...

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Problems solved by technology

The electrode welding process involved in this patent document has good performance, less spatter, and low smoke and dust, but the disclosed technical solution does not involve the design of the welding core composition

[0005] The publication number is CN103008917A, and the publication date is April 3, 2013. The Chinese patent document titled "A New Ultra-Supercritical Ferritic Heat-resistant Steel Welding Rod" discloses a new ultra-supercritical ferritic heat-resistant steel The welding rod adopts H08Cr9WMo welding core and coating in the technical solution disclosed in this patent document, and the coating composition is: 28-40% marble, 18-28% fluorite, 5-10% rutile, 3-8% ferrotitanium , 4-10% silicon powder, 2-5% ferrosilicon, 1-1.8% ferrovanadium, 0.4-0.8% ferroniobium, 1-1.8% nickel powder, 0.4-0.8% soda ash, 0.4-0.8% CMC, 0.2- 0.6% amorphous graphite, 0.6-1.5% ferrochromium nitride, 1.5-3% electrolytic manganese, stable arc, less spatter and good slag removal during welding. However, the technical solution disclosed in this patent document only involves electrode powder Skin composition design, but no welding wire composition design

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