Welding wire with welding seam aging embrittlement resistance for high-grade martensitic heat-resistant steel and application of welding wire

Abstract

The invention discloses a welding wire with welding seam aging embrittlement resistance for high-grade martensitic heat-resistant steel and application of the welding wire. The welding wire compriseschemical components as follows: 0.05%-0.12% of C, 0.15%-0.40% of Si, 0.40%-1.0% of Mn, 0.01% or smaller than 0.01% of P, 0.008% or smaller than 0.008% of S, 0.20% or smaller than 0.20% of Ni, 8.50%-9.50% of Cr, 0.90%-1.90% of W, 0.30%-1.10% of Mo, 2.50%-3.50% of Co, 0.03%-0.07% of Nb, 0.15%-0.25% of V, 0.03%-0.07% of N, 0.001%-0.004% of B, 0.10% or smaller than 0.10% of Cu, 0.01% or smaller than 0.01% of Ti, 0.03% or smaller than 0.03% of Al and the balance Fe and inevitable impurities. According to the welding wire, the welding seam formation is good, the initial toughness is high, the agingembrittlement tendency is small, and a joint has excellent high-temperature creep lasting strength.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a welding wire for high-grade martensitic heat-resistant steel with anti-aging embrittlement of welds and an application thereof. Background technique [0002] The 9Cr-3W-3Co series martensitic heat-resistant steel is an ideal material for the construction of thick-walled pressure-bearing components such as ultra-supercritical thermal power unit headers and steam pipes with steam temperature parameters above 625 ° C. The commercial grades include G115 steel developed in China and Japan. Developed T / P93 steel, the creep strength of this type of steel is 20-50% higher than that of T / P92 steel. In the process of building high-parameter ultra-supercritical thermal power units, there are a large number of welded joints of this type of steel, so the process performance and conventional mechanical properties of the joints need to meet the requirements, especially t...

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Problems solved by technology

The welding wires published in these patent documents are all designed with a high content of W element similar to 9Cr-3W-3Co, and the welds have obvious aging embrittlement

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