Hot rolled wire rod for 600 MPa-grade high-strength welding and production method for hot rolled wire rod

Abstract

The invention discloses a hot rolled wire rod for 600 MPa-grade high-strength welding and a production method for the hot rolled wire rod. The production method comprises the processes of heating, rough rolling, finish rolling, spinning, cooling and reel collecting. The steel blank which comprises the following components in percentage by mass is adopted: 0.05 to 0.09 percent of C, 0.40 to 0.80 percent of Si, 1.40 to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 0.03 to 0.06 percent of V, 0.05 to 0.10 percent of Ti, and the balance of Fe and unavoidable impurities. According to the production method, a carbonitride can be formed by combining alloy elements, namely V and Ti, with C and N by utilizing the effects of microalloy elements, namely vanadium and titanium, in the steel under the condition of the existing production equipment in a vanadium and titanium alloying mode, and can achieve the effects of precipitation strengthening and refined crystalline strengthening; the precipitation of the carbonitride, the recrystallization of the austenite and the deformation state of the austenite are controlled by controlling the finish rolling temperature, the spinning temperature, the cooling speed and the reel collecting temperature; finally, the hot rolled wire rod with required strength index and uniform performance for the 600 MPa-grade high-strength welding is obtained. The hot rolled wire rod has the characteristics of low raw material cost, low production cost and stable product performance.

Description

technical field [0001] The invention relates to a hot-rolled wire rod, in particular to a 600MPa grade high-strength welding hot-rolled wire rod and a production method thereof. Background technique [0002] my country is the world's largest producer of welding consumables, and also the country that uses the largest amount of welding consumables. As the steel materials used in various manufacturing industries such as pressure vessels and automobiles tend to be increasingly high-strength, higher requirements are placed on the strength of deposited metal in welding. Non-alloy steel wire rods and even low-alloy steel wire rods cannot fully meet the demand. [0003] In the prior art, the welding wire with the application number of 89105436.7 and the gas shielded welding wire with the application number of 95108258.2 all adopt expensive Ni and Mo elements; And the high-toughness gas-shielded welding wire for low-alloy high-strength steel with application number 01133651.X does ...

AI Technical Summary

Problems solved by technology

As the steel materials used in various manufacturing industries such as pressure vessels and automobiles tend to be increasingly high-strength, higher requirements are placed on the strength of deposited metal in welding. Non-alloy steel wire rods and even low-alloy steel wire rods can no longer fully meet the needs

[0003] In the prior art, the welding wire with the application number of 89105436.7 and the gas shielded welding wire with the application number of 95108258.2 all adopt expensive Ni and Mo elements; And the high-toughness gas-shielded welding wire for low-alloy high-strength steel with application number 01133651.X does not contain Mo element and uses B element. Although B element can improve the strength of deposited metal, it is easy to form BN and the absorption rate is unstable. phenomenon, resulting in an increase in smelting costs

The alloy steel wire rod for welding specified in GB / T 3429 and the 600MPa grade welding wire specified in GB / T 8110 are produced by compound alloying of Mn, Ni, Mo, V, Ti, Zr, Al and other elements. Process; due to the addition of many types of alloys, on the one hand, it leads to complex steel-making feeding and rolling process, and has high requirements for rolling equipment, resulting in an increase in process costs. On the other hand, multi-element alloying causes large performance fluctuations and affects the stability of product quality. sex

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