A kind of stainless steel electrode used for welding 904l steel

Abstract

The invention discloses a stainless steel welding rod used for 904 L steel welding. The stainless steel welding rod comprises a welding core and a titanium-calcium type coating covering the outside of the welding core. The welding core comprises, by weight, 0%-0.02% of C, 1.50%-2.50% of Mn, 0%-0.30% of Si, 24.0%-26.0% of Ni and the like. The coating comprises, by weight, 30%-45% of rutile powder, 8%-15% of marble powder, 3%-10% of fluorite powder, 8%-12% of feldspar, 9%-12% of mica, 1.5%-3% of titanium dioxide, 0.5%-1.5% of fluoroaluminate, 3%-5% of electrolytic manganese and the like. According to the stainless steel welding rod used for 904 L steel welding, the electric arc stability and the liquidity of a molten pool are good, and slag shells of molten slag are uniformly covered; deslagging is easy; a formed welding seam is flat, and the welding seam crack resistance is good; the purity of the chemical composition of postwelding deposited metal is high, and the performance is superior.

Description

technical field [0001] The invention relates to a welding material, in particular to a stainless steel welding rod used for welding 904L steel. Background technique [0002] 904L (N08904,,, 14539) super austenitic stainless steel contains 14.0-18.0% chromium, 24.0-26.0% nickel, 4.5% molybdenum; tensile strength: σb≥520Mpa, elongation: δ≥35%, with good Activation-passivation conversion ability, excellent corrosion resistance, good corrosion resistance in non-oxidizing acids such as sulfuric acid, acetic acid, formic acid, phosphoric acid, and good pitting resistance in neutral chloride ion-containing media At the same time, it has good resistance to crevice corrosion and stress corrosion resistance. It is suitable for sulfuric acid of various concentrations below 70°C, and has good corrosion resistance against acetic acid of any concentration and temperature under normal pressure, and the mixed acid of formic acid and acetic acid. Widely used in: reactors in petrochemical e...

AI Technical Summary

Problems solved by technology

The welding electrodes currently used for welding such steel types generally have the problems of generally low mechanical properties (elongation) of the deposited metal and poor crack resistance of the weld, and needle-shaped tiny pores are easily found in the PT flaw detection inside the weld. Therefore, the service life of the container is greatly limited, and the safety hazard of the container is increased.

[0003] The melting point of the 904L alloy is relatively high, and the electrode produced with the ordinary acidic or alkaline slag-based coating formula often has poor arc stability, poor fluidity of the molten pool, and uneven coverage of the slag shell; The slag is difficult, the residue is not cleaned cleanly; the welding seam is not smooth, the surface brightness is not good, and the welding seam crack resistance is poor.

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