Nitrogen-strengthened hardfacing electrode

Abstract

The invention discloses a nitrogen-strengthened hardfacing electrode, and belongs to the technical field of welding materials. The electrode is composed of a core wire and a coating. The core wire is 1Cr13 martensitic stainless steel or 2Cr13 martensitic stainless steel. The electrode coating comprises 10-30wt% of fluorite, 20-45wt% of marble, 4-8 wt% of titanium dioxide, 2-8wt% of zirconite, 0-5wt% of potassium feldspar, 10-20wt% of nitrogen-bearing ferrochromium, 3-8wt% of ferromanganese, 5-10wt% of ferrotitanium and 5-10wt% of ferrovanadium. According to the nitrogen-strengthened hardfacing electrode, carbon is replaced by nitrogen, the method of nitrogen-strengthened titanium and vanadium microalloying is adopted, and therefore the toughness and the crack resistance of surfacing alloy are improved, and hardness and wear-resisting performance are also improved. The nitrogen-strengthened hardfacing electrode is good in welding process and performance and high in welding crack resisting performance, ensures that the average hardness of a surfacing layer ranges from HRC50 to HRC60 and the abrasive resistance of the surfacing layer is 10-20 times that of Q235 carbon steel, and has the advantages of being strong in air hole preventing ability, good in alloying uniformity degree and the like.

Description

technical field [0001] The invention relates to a nitrogen-enhanced wear-resistant surfacing electrode, which belongs to the technical field of welding materials. The electrode can be widely used in the surface modification, composite manufacturing and remanufacturing of rolls in iron and steel plants, coal grinding rolls in thermal power plants, engineering excavation machinery, mining machinery, etc. Background technique [0002] As an important branch in remanufacturing engineering, surfacing welding can form a typical metallurgical bond with the base metal. The surfacing layer has a small tendency to peel off during service, and the surfacing alloy can be selected or designed according to the service performance, so that the surface of the material or part has good properties such as wear resistance, corrosion resistance, high temperature resistance, and radiation resistance. It has great flexibility, among which wear-resistant electrode surfacing plays an important rol...

AI Technical Summary

Problems solved by technology

This kind of surfacing welding electrode material has high carbon content, poor resistance to welding cracks, and the carbonized material points are easy to decompose at high temperature, resulting in a decrease in hardness and wear resistance

Usually, as the carbon content increases, the carbide content in the surfacing layer metal increases, and the hardness and strength will increase, but the carbides cannot be evenly distributed in the surfacing alloy. When the carbide content is too high, A large number of carbides will gather in large pieces at the grain boundaries, which will not only fail to effectively improve the hardness and strength of the hardfacing alloy, but also significantly reduce its toughness

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