Cold-rolled steel strip for flux-cored welding wire with low-temperature toughness and production method thereof

Abstract

The invention provides cold-strip steel with low-temperature toughness for flux-cored wires and a production method of the cold-strip steel. The strip steel comprises the following chemical components in percentage by mass: 0.045-0.06 percent of C, 1.4-1.5 percent of Mn, less than or equal to 0.04 percent of Si, less than or equal to 0.01 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.03 percent of Als, 0.0020-0.0030 percent of N, and the balance of Fe and inevitable impurities. The technical parameters in production comprise that the hot-rolling heating temperature is 1,230+ / -20 DEG C, the finish rolling temperature is 910+ / -20 DEG C, the winding temperature is 700+ / -20 DEG C, the cold rolling reduction ratio is controlled to be 75-80 percent, the annealing temperature is controlled to be 780+ / -10 DEG C, and the temper rolling elongation is 0.9 percent. According to the cold-strip steel with low-temperature toughness for flux-cored wires and the production method of the cold-strip steel, the produced strip steel is high in low-temperature toughness, low in yield strength, high in elongation rate and high in forming performance, and can fulfill the requirement for the flux-cored wire steel for low-temperature storage tanks which is less than or equal to negative 30 DEG C and vessels.

Description

technical field [0001] The invention belongs to the field of metal material processing, in particular to a cold-rolled steel strip for flux-cored welding wire with low-temperature toughness and a production method thereof. Background technique [0002] Flux-cored welding wire is a new type of welding material, which has been widely used in industrially developed countries. It is a welding wire formed by forming low-carbon cold-rolled strip steel, filling it with flux powder, and then drawing. In recent years, the production of flux-cored welding wire in my country developed rapidly. Flux-cored wire has the advantages of high benefit, low cost, high quality, automation, small spatter, and good forming. It is widely used in shipbuilding, metallurgy, petrochemical and mechanism industries, especially in shipbuilding industry. Flux-cored wire has replaced manual electrodes. And solid welding wire, become the most consumed welding material. The cold-rolled steel plate for flux-c...

AI Technical Summary

Problems solved by technology

The cold-rolled steel plate for flux-cored welding wire obtained by smelting in the prior art has the disadvantages of poor low-temperature toughness and poor formability due to unreasonable composition control and high content of P and S.

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