Bismuth-free stainless steel flux-cored wire

Abstract

The invention discloses a bismuth-free stainless steel flux-cored wire. A welding agent of the bismuth-free stainless steel flux-cored wire is prepared from the following components of, by weight, less than or equal to 0.001% of Bi, 5-15% of titanium oxide, 1-3% of silicon oxide, 1-3% of zirconium oxide, 0.1-1% of manganese oxide, 0.1-1% of iron oxide, 1.0-2.0% of manganese metal, 0.1-1.0% of silicon metal, 8.0-14.0% of nickel metal, 18.0-25.0% of chrome metal, 0.1-1.5% of fluoride, 0.01-0.5% of rare earth metal and the balance Fe. According to the bismuth-free austenitic stainless steel flux-cored wire, Bi of the deposited metal is less than or equal to 5 ppm, the risk that heat cracking happens on an austenitic stainless steel joint is more effectively reduced, and the safety productbility of pressure containers and a petrochemical industry is improved.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a bismuth-free austenitic stainless steel flux-cored welding wire. Background technique [0002] Stainless steel flux-cored wire has the characteristics of excellent weldability, stable physical and chemical properties, excellent corrosion resistance, and short adjustment cycle of alloy composition. At present, the industry is more and more widely used, and the types are becoming more and more complete, and it has also penetrated into some special industries. Applications in various fields, such as pressure vessels and nuclear power. [0003] In order to obtain good slag removal performance of ordinary stainless steel flux-cored welding wire, it will be obtained by adding excessive Bi element. If the Bi content is insufficient, the slag removal performance will be extremely poor. However, when welding austenitic stainless steel with stainless steel flux-cored wire During the pro...

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Problems solved by technology

[0003] In order to obtain good slag removal performance of ordinary stainless steel flux-cored welding wire, it will be obtained by adding excessive Bi element. If the Bi content is insufficient, the slag removal performance will be extremely poor. However, when welding austenitic stainless steel with stainless steel flux-cored wire During the production process, the welded joints will produce hot cracks after working in an environment higher than 700 ° C for a period of time. After research, it is found that the Bi element is the main reason for the influence. Therefore, in order to improve the hot crack tendency of austenitic stainless steel, the stainless steel flux core The Bi content in the deposited metal of the welding wire is controlled in an extremely low range, but in this way, it is easy to cause poor slag removal due to the low Bi content

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