Nickel-saving austenitic stainless steel welding rod for surfacing of Cr-Mo steel flange forge piece and preparation method of nickel-saving austenitic stainless steel welding rod

Abstract

The invention discloses a nickel-saving austenitic stainless steel electrode for surfacing of a Cr-Mo steel flange forge piece and a preparation method of the nickel-saving austenitic stainless steel electrode, and belongs to the technical field of welding materials. The nickel-saving economical austenitic stainless steel surfacing electrode is smooth and attractive in weld joint formation and has excellent crack resistance and intergranular corrosion resistance. The nickel-saving austenitic stainless steel electrode for surfacing of the Cr-Mo steel flange forge piece is composed of a welding core and a coating, wherein the coating is prepared from rutile, mica powder, potassium titanate, electrolytic manganese metal, fluorite, potassium feldspar, marble, cryolite, alkali, metal chromium powder and niobium powder according to the mass fraction. The preparation method comprises the following steps that firstly, the materials are mixed to obtain the coating, then the coating is uniformly mixed with pure sodium water glass, the welding core is coated with the coating, and baking is carried out at low temperature and high temperature to obtain the electrode. According to the electrode, manganese and nitrogen are combined to replace an alloy element nickel to obtain an austenite structure, the manufacturing cost is low, and the crack resistance and corrosion resistance of a material can be improved.

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...

AI Technical Summary

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

Images