A nickel-saving austenitic stainless steel welding rod for overlay welding of cr-mo steel flange forgings and preparation method thereof

Abstract

A nickel-saving austenitic stainless steel electrode for surfacing welding of Cr-Mo steel flange forgings and a preparation method thereof. The invention belongs to the technical field of welding materials. The purpose of the invention is to develop a nickel-saving economical austenitic stainless steel surfacing welding electrode with smooth and beautiful weld seam, excellent crack resistance and intergranular corrosion resistance. A nickel-saving type austenitic stainless steel electrode for surfacing welding of Cr-Mo steel flange forgings of the present invention is composed of a welding core and a coating, and the coating is composed of rutile, mica powder, potassium titanate, electrolytic metal according to the mass fraction Manganese, fluorite, potassium feldspar, marble, cryolite, alkali, metallic chromium powder and niobium powder. Method: first mix the materials to obtain the coating, then mix the coating with pure sodium water glass evenly, then coat the welding core, and obtain the welding rod after low-temperature and high-temperature baking. The welding rod of the invention uses manganese and nitrogen to replace the alloy element nickel to obtain an austenite structure, has low manufacturing cost, and can improve the crack resistance and corrosion resistance of the material.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a nickel-saving austenitic stainless steel electrode for surfacing welding of Cr-Mo steel flange forgings and a preparation method thereof. Background technique [0002] At present, with the rapid development of my country's stainless steel industry, the consumption of stainless steel is also increasing rapidly, but my country's nickel resources are relatively poor, and the supply of domestic nickel resources cannot meet the demand for nickel from the growth of the stainless steel industry. The total annual consumption of nickel resources in China About 70% of the country's production depends on foreign imports, which is a huge financial expenditure for the country's economic development, and at the same time makes domestic development subject to others; nickel is a relatively scarce and expensive element, especially in times of war, because nickel is also a s...

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Problems solved by technology

[0003] The flange material of the gasifier equipment is Cr-Mo steel forging, and its inner surface and sealing surface need to be surfacing with stainless steel for corrosion resistance. The surfacing transition layer usually uses E309L electrode, and the surfacing corrosion-resistant layer usually uses E347 or The special welding consumables for E316, according to the requirements of the GB / T 983-2012 standard, the Ni content of the E347 surfacing electrode is 9.0-11.0%, and the Ni content of the E316 surfacing electrode is 11.0-14.0%. The Ni content of austenitic stainless steel is only about 2.0%. Obviously, the Ni content of the new nickel-saving austenitic stainless steel surfacing welding electrode will be reduced by 78-86%, and the price will be reduced by 35-45%, which will greatly reduce the manufacturing cost, but it is suitable for The research and development of nickel-saving austenitic stainless steel surfacing welding electrodes made of Cr-Mo steel forgings for the flange of gasifier equipment is blank so far, and no relevant literature reports have been seen so far

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