Alloy creep resistant heat resistant steel submerged arc welding stick

Abstract

The invention discloses an alloy creep resistant heat resistant steel submerged arc welding stick, mainly comprising the following elements by percentage: 0.05 to 0.18% of C, 0.80 to 1.20% of Mn, 0.40 to 0.80% of Si, not more than 0.010% of S, not more than 0.35% of Cu, 2.20-3.80% of Cr, 0.40 to 0.80% of Ni, 0.8 to 1.40% of Mo, 0.90 to 1.30% of W, 0.30 to 0.80% of V, 0.20 to 0.50% of Ti, 0.08 to 0.16% of B, not more than 0.05% of Al, and balance of Fe. The alloy creep resistant heat resistant steel submerged arc welding stick is applied to the welding of heat-resisting steel 2.23 Cr-1Mo and 12CrMoWVB alloy hat-resisting steel, and SA-335P22 steel of a nuclear power boiler, a gas turbine generator, a high pressure steam pipe, a petroleum chemical industry and a nuclear power device at a working temperature of 600 DEG C. The welding process parameters of the alloy creep resistant heat resistant steel submerged arc welding stick comprise: a welding stick diameter is phi4.0mm, a coordinated welding agent is SJ101, a welding current is 550A, a welding voltage is 30V, and an inter-channel temperature is 135-165 DGC C. The alloy creep resistant heat resistant steel submerged arc welding stick can service for long-term under the high temperature of 600 DEG C without the occurrence of creep rupture phenomenon.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to an alloy creep-resistant heat-resistant steel submerged arc welding wire. Background technique [0002] 1. Existing submerged arc welding wires such as the patent "High Toughness Welding Wire Suitable for Low Carbon Microalloyed Steel" proposed by Yanshan University disclosed in Chinese Patent Application No. 02119591.9. The chemical composition formula of welding wire is as follows: C: 0.01~0.12%, Si: 0.10~0.40%, Mn: 0.60~2.30%, Cr: 0.01~0.22%, Mo: 0.08~0.60%, V:0.004~0.06%, Cu :0.01~0.50%, Ni: 0.01~0.60%, Al: 0.01~0.06%, Nb: 0.02~0.08%, Ti: 0.01~0.20%, B: 0.0001~0.01%, Re: 0.001~0.5%. [0003] This welding wire contains Cu, Cr, Ni, Mo, Nb, V, Ti, B, Re and other alloying elements. The composition design is more complicated, and it is not heat-resistant. [0004] 2. The high-strength heat-resistant steel submerged arc welding wire of the patent JP (Zhao) 59-4994A ...

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Problems solved by technology

(1) In the composition design of the disclosed patent, Ni is 0-0.30%. When the content is in the lower line or gradually becomes "0", the corresponding effect will be lost, and its heat resistance temperature, creep resistance and other properties will also decline. ; (2) W, V, Ti, B and other alloying elements are not included in the composition design. This welding wire can no longer meet the current welding requirements of nuclear power boilers, petrochemical equipment, etc. for high temperature resistance, creep resistance, and high tensile strength; ( 3) Due to the constraints of the previous steelmaking technology, S and P cannot be strictly controlled, and the high temperature creep resistance of the weld deposit metal obtained after welding the welding wire recorded in this patent is restricted.

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