Ultralow-temperature high-manganese steel welding wire, welding rod and preparation method thereof

Abstract

The invention discloses an ultralow-temperature high-manganese steel welding wire, an ultralow-temperature high-manganese steel welding rod and a preparation method of the ultralow-temperature high-manganese steel welding rod. The welding wire comprises the following components in percentage by mass: 0.2-0.5% of C, 26-32% of Mn, 0.02-0.10% of Si, less than or equal to 5% of Ni, 1.5-6.5% of Cr, 0.3-1.5% of Mo, less than or equal to 0.02% of S, less than or equal to 0.04% of P and the balance of Fe and inevitable impurities. According to the welding wire, use of Ni is greatly reduced, cladding metal formed by welding materials forms an austenite structure through alloying of C, Mn, Cr and Mo, excellent performance is generated, Ni resources are saved, and cost is reduced. According to the welding rod, on the basis of the welding wire, the special low-component coating is added, and formed cladding metal is excellent in performance and completely meets the use requirement of a liquefied natural gas storage tank.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to an ultra-low temperature high manganese steel welding wire, an welding rod and a preparation method thereof. Background technique [0002] Currently, the steel used for LNG storage tanks is 9Ni steel. Because the nickel content is as high as 9%, the steel plate is expensive. In order to save Ni resources, reduce the cost of steel materials and energy storage and transportation costs, countries all over the world have begun to study low-cost alternatives. South Korea's Posco took the lead in developing austenitic high manganese steel for ultra-low temperature and registered it as the standard technology of ASTM International, an international material and standards organization, for the first time in the world in 2017, which means that Posco's ultra-low temperature high manganese steel has obtained international authoritative certification. [0003] However,...

AI Technical Summary

Problems solved by technology

However, the welding of austenitic high-manganese steel for ultra-low temperature in the market currently uses 9Ni manual welding rods. On the one hand, the Ni content in the welding wire is as high as 50% to 60%, which makes the cost too high. On the other hand, the welding consumables contain a large amount of Ni element, while the base metal contains a large amount of Mn element, the concentration gradient of the two elements will make the alloy elements diffuse out of the fusion line of the welded joint, affecting its structure and properties

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