Welding rod for welding of martensite heat-resistant steel

Abstract

The invention discloses a welding rod for welding of martensite heat-resistant steel and belongs to the technical field of welding materials. The welding rod consists of a core wire and a coating, wherein the core wire is prepared from components in percentage by weight as follows: 0.07%-0.10% of C, less than or equal to 0.3% of Si, 0.3%-0.7% of Mn, less than or equal to 0.004% of P, less than or equal to 0.002% of S, 8.5%-9.5% of Cr, 2.8%-3.3% of W, 2.8%-3.5% of Co, 0.04%-0.08% of Nb, 0.15%-0.25% of V, 0.8%-1.0% of Cu, 0.007%-0.011% of N, 0.011%-0.020% of B and the balance of Fe; the coating is prepared from components as follows: 30%-45% of marble, 18%-25% of fluorite, 5%-10% of rutile, 10%-16% of barium carbonate, 5%-10% of ferrotitanium, 1.5%-3% of electrolytic manganese, 5%-10% of iron powder, 0.4%-0.8% of sodium carbonate, 0.4%-0.8% of carboxymethyl cellulose and 0.8%-3% of chromium metal powder. The welding rod has the advantages that the arc is stable during welding, few splashes are caused, the all-position operability is good, the slag detachability is good, formed welds are attractive in appearance, and deposited metal after welding has high strength and high toughness close to that of a parent metal, higher endurance strength and excellent crack sensitivity.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to a welding rod for martensitic heat-resistant steel welding. The welding rod is used for the welding of martensitic heat-resistant steel G115. During welding, the arc is stable, less spatter, good all-position operability, good slag removal, beautiful weld shape and high strength of deposited metal after welding. , High toughness, high durable strength, excellent resistance to crack sensitivity. Background technique [0002] Improving the steam temperature parameters of thermal power units is the most important measure to improve the thermal efficiency of the unit and realize coal saving and emission reduction. [0003] At present, several large electric power units in my country are actively preparing to build the world's first 630°C ultra-supercritical coal-fired demonstration power station; entrusted by the National Energy Administration, the General Electric Power P...

AI Technical Summary

Problems solved by technology

[0010] There is no heat-resistant steel supporting electrode for new martensitic heat-resistant steel G115 in the existing market. No matter whether P92 matching electrode or nickel-based alloy (such as 617 nickel-based alloy and 82 alloy) electrode is used, there are insurmountable problems

On the one hand, the mechanical properties of the deposited metal at room temperature and high temperature are poor, the strength and toughness do not match, and the durability cannot meet the requirements; Disadvantages such as large welding spatter, narrow weld bead, poor weld formation and poor slag removal