Heat-resisting steel flux-cored wire

Abstract

The invention discloses a flux cored wire for heat resistant steel. Flux cored powder of the flux cored wire is formed by mixing the following components by weight percentage: 21 to 23 percent of rutile, 1.5 to 2.5 percent of aedelforsite, 19 to 21 percent of silicon-manganese alloy, 8.5 to 10.5 percent of ferrous powder, 1.5 to 2.5 percent of nickel powder, 2.5 to 3.5 percent of cryolite, 7 to 9percent of feldspar, 13 to 14 percent of ferrochrome, 6 to 7 percent of ferromolybdenum, 6 to 7 percent of mid-carbon ferromanganese, 2.5 to 4.5 percent of magnesite, 6 to 7.5 percent of quartz, 0.5 to 2 percent of fluorite, 1.5 to 3 percent of aluminum-magnesium alloy and 0.5 to 2 percent of ferrotitanium. During the welding, the flux cored wire not only uses CO2 to protect shielded welding, butalso has the advantages of small splash, easy slag removal, stable electric arc burning, and spray transfer as a droplet transfer form.

Description

technical field [0001] The invention relates to the technical field of metal welding materials, in particular to a heat-resistant steel flux-cored welding wire. Background technique [0002] Low- and medium-alloy pearlitic heat-resistant steels (including bainite steels) based on Cr-Mo (chromium-molybdenum) are important metal materials working under high-temperature conditions in power, petroleum and chemical industries. It is generally used in environments below 600°C. It not only has good oxidation resistance and heat strength, but also has good resistance to sulfuric acid and hydrogen corrosion. Common welding methods for this type of steel include manual arc welding, submerged arc welding, metal arc welding and TIG welding. Usually, the traditional heat-resistant steel flux-cored wire must use a mixed gas (Ar+CO 2 ) as a protective gas to ensure the stability of the arc and the movement of metal droplets, but the price of Ar is relatively high, and Ar+CO 2 It is not e...

AI Technical Summary

Problems solved by technology

Common welding methods for this type of steel include manual arc welding, submerged arc welding, metal arc welding and TIG welding. Usually, the traditional heat-resistant steel flux-cored wire must use a mixed gas (Ar+CO 2 ) as a protective gas to ensure the stability of the arc and the movement of metal droplets, but the price of Ar is relatively high, and Ar+CO 2 It is not easy to control, so the use environment of traditional heat-resistant steel flux-cored wire is limited

If 100% CO is used 2 Gas shielded welding has defects such as large spatter in the welding process, difficult slag removal, unstable arc, increased oxygen content in the weld metal, and reduced toughness of the weld metal.