Steel wire rod for bainite high-strength welding wire and production method thereof

Abstract

The invention discloses a steel wire rod for a bainite high-strength welding wire and a production method thereof. The steel wire rod for the bainite high-strength welding wire comprises the followingchemical components of, in percentage by mass, 0.05%-0.11% of C, 0.35%-0.65% of Si, 1.60%-1.80% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.25%-0.37% of Cr, 1.45%-1.85% of Ni, 0.42%-0.52% of Mo, 0.13%-0.16% of Ti, and the balance Fe and unavoidable impurities. The mechanical property of the steel wire rod for welding wire meets the conditions that the tensile strength is larger than or equal to 900 MPa, the elongation is larger than or equal to 25%, the cross-section shrinkage rate is larger than or equal to 70%, and the steel wire rod can be applied to thefield of high-strength steel welding 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 bainite high-strength welding wire and a production method thereof, in particular to a steel wire rod with a tensile strength of 800 MPa for bainite high-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 of the domestic mature welding wire above 800MPa needs 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 mat...

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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