A kind of welding strip for surfacing welding of nickel-saving and high-nitrogen austenitic stainless steel strip and supporting flux and preparation method thereof

Abstract

A welding strip for surfacing welding of nickel-saving and high-nitrogen austenitic stainless steel strips, a matching flux and a preparation method thereof. The invention belongs to the field of welding materials. The invention solves the technical problem of low corrosion resistance and hydrogen stripping resistance of the surfacing layer metal when welding low-nickel nitrogen-containing austenitic stainless steel at present. The chemical composition of the welding strip of the present invention is calculated as: C:≤0.04%, Si:≤0.65%, Mn: 5.00%~9.00%, P≤0.020%, S≤0.015%, Cr: 18.00%~22.00 %, Ni: 2.50% to 3.00%, Mo: ≤ 0.65%, Cu: ≤ 0.75%, N: 0.10% to 0.30%, and the balance is Fe. The flux is prepared from dry powder and potassium sodium silicate; the dry powder is mixed from fluorspar, magnesia, corundum, wollastonite, andalusite, mullite and micro-carbon ferrochrome. Method: Dry mixing of dry powder raw materials, adding potassium and sodium silicate to continue stirring, then drying at low temperature, sintering at high temperature, and sieving to obtain flux. The welding strip of the invention has low cost and excellent flux performance. The surfacing metal has good corrosion resistance and hydrogen stripping resistance.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a welding strip for surfacing welding of austenitic stainless steel with low nickel and high nitrogen, a matching flux and a preparation method thereof. Background technique [0002] With the development of modern industry, the requirements for materials are getting higher and higher. In order to meet various harsh conditions of use, great attention has been paid to the research and development of various new materials, and the corresponding welding materials have also received corresponding development of. Low-nickel nitrogen-containing austenitic stainless steels are widely used in industries such as ship, aviation, chemical industry, and petroleum containers due to their good plasticity, corrosion resistance, and high temperature resistance. [0003] Nitrogen is the main element for the formation of austenite structure. In austenitic stainless steel, nitrogen is u...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a nickel-saving high-nitrogen austenitic stainless steel strip in order to solve the technical problem that the corrosion resistance and hydrogen stripping resistance of the surfacing layer metal are not high when welding the low-nickel nitrogen-containing austenitic stainless steel. Welding strip for overlay welding and matching flux and preparation method thereof

Images