Low-hydrogen welding rod for ultra-low-temperature high-manganese steel manual arc welding

Abstract

The invention discloses a low-hydrogen welding rod for ultra-low-temperature high-manganese steel manual arc welding. The low-hydrogen welding rod for the ultra-low-temperature high-manganese steel manual arc welding comprises a welding rod core and a coating, wherein chemical components of the welding rod core comprise 0.30-0.75 wt% of C, 20-26 wt% of Mn, 6.5-8.5 wt% of Ni, 3.0-5.5 wt% of Cr, 2.5-4.0 wt% of W, less than or equal to 0.002 wt% of P, less than or equal to 0.001 wt% of S, and the balance Fe and inevitable impurities; and chemical components of the coating comprise 35-40 wt% of marble, 16-22 wt% of fluorite, 3-5 wt% of quartz sand, 3-6 wt% of zircon sand, 4-10 wt% of titanic schorl, 5-10 wt% of ferrotitanium, 5-8 wt% of low carbon ferromanganese, 3-6 wt% of silicon iron, 1-2 wt% of rare earth ferrosilicon, 2-3 wt% of synthetic mica, and 1-2 wt% of sodium carbonate, wherein the sum of the weight percentages of all the components is 100%. The low-hydrogen welding metal has excellent low-temperature toughness and the strength which is matched with the ultra-low-temperature high-manganese steel, and can meet the technical requirements for the strength and the ultra-low-temperature toughness of the ultra-low-temperature high-manganese steel to be welded.

Description

technical field [0001] The invention relates to a low-hydrogen type electrode used for manual arc welding of ultra-low temperature high manganese steel. Background technique [0002] With the implementation of the marine strategy and the new energy strategy, in the next few decades, the demand for steel materials used for low-temperature or ultra-low temperature storage and transportation containers such as liquefied natural gas (LNG) will gradually increase. At present, the steel used for LNG storage tanks is 9Ni steel for commercial use. 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, researchers are actively developing ultra-low temperature high manganese steel. [0003] In the application process of ultra-low temperature high manganese steel, manual arc welding is a commonly used welding method when welding processes are used to manuf...

AI Technical Summary

Problems solved by technology

In engineering practice, if the same electrode as 9Ni steel is used, the most widely used electrode for 9Ni steel is nickel-based electrode. There are two problems: first, the nickel content in the welding wire is 50-60%, which is expensive; second, the base metal The composition of the welding wire belongs to a different composition system, and the alloy content is quite different, which will cause the diffusion of elements at the fusion line of the welded joint, and the change of structure and performance