Steel wire rod with 600MPa-grade yield strength and used for welding wire, and production method thereof

Abstract

The invention discloses a steel wire rod with 600MPa-grade yield strength and used for a welding wire, and a production method thereof. The steel wire rod with the 600MPa-grade yield strength and usedfor the welding wire comprises the following chemical components in percentage by mass: 0.06%-0.12% of C, 0.35%-0.45% of Si, 1.55%-1.70% of Mn, not greater than 0.020% of P, not greater than 0.010% of S, 0.25%-0.40% of Cr, 1.70%-1.95% of Ni, 0.42%-0.52% of Mo, 0.10%-0.12% of Ti, and the balance Fe and inevitable impurities. The mechanical property of the provided steel wire rod for the welding wire meet the following conditions: the yield strength is not less than 600MPa, the elongation is not less than 25%, the percentage reduction of area is not less than 70%, and the steel wire rod for thewelding wire can be applied to the high-strength steel welding fields of coal mine machinery, containers, buildings, ships, bridges and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a steel wire rod for 600MPa yield strength welding wire and a production method thereof. Background technique [0002] With the rapid development of my country's economy, steel materials are gradually developing from ordinary grades to high-strength grades; at the same time, the market demand for high-strength grade welding wire steels is also increasing. Most domestic mature welding wires with a yield strength above 600MPa need to be imported, which is far from meeting the growing demand for gas shielded welding of low-alloy high-strength steel. This will cause the entire welded joint to become a serious weak spot. It can be seen that the research on welding materials also seriously restricts the wide application of high-strength steel materials. Therefore, it is imperative to develop corresponding high-strength welding consumables to solve the problem of the mi...

AI Technical Summary

Problems solved by technology

The addition of high alloy increases the strength of the wire rod while increasing the sensitivity to the cooling rate, which makes the CCT curve move to the lower right, and is prone to produce abnormal structures such as martensite, which will affect the drawing performance of the welding wire. Unfavorable effects, it is easy to cause brittle fracture of the wire rod, so it is very difficult to control the rolling process of the wire rod to obtain a good target structure and rod performance

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