High-strength heat-resisting and cold-heading steel wire rod and production method thereof

Abstract

The invention discloses a high-strength heat-resisting and cold-heading steel wire rod and a production method thereof. The high-strength heat-resisting and cold-heading steel wire rod is prepared from the following components in percentage by weight: 0.38 to 0.50 percent of C, 0.30 to 0.40 percent of Si, 0.75 to 1.00 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, 0.90 to 1.20 percent of Cr, 0.35 to 0.45 percent of Mo, 0.25 to 0.35 percent of V, less than or equal to 15 ppm of [O], less than or equal to 45 ppm of [N] and the balance of Fe and trace impurities. The wire rod is microalloyed by Cr-V-Mo, thus ensuring that elements are uniformly dispersed and the gas content is well controlled, and the wire rod can be high in heat resistance. The wire rod is high in strength and heat resistance; and no noble metals are added, so that the cost is lower. According to the production method, equipment and the investment are not needed to be added, so that the production cost is not increased; the conventional equipment and the conventional process are fully used; high-strength bolts prepared from the wire rod obtained according to the requirement of a downstream manufacturing enterprise on the resistance to high temperature stability can keep high strength and toughness indexes when working under a high temperature state of 600 DEG C; and the high-strength heat-resisting and cold-heading steel wire rod is high in resistance to high temperature stability, strength and heat resistance.

Description

technical field [0001] The invention relates to a wire rod and a production method thereof, in particular to a high-strength heat-resistant cold heading steel wire rod and a production method thereof. Background technique [0002] The steam turbine manufacturing industry is the foundation of the electric power industry and reflects a country's machinery manufacturing level. my country's steam turbine output accounts for 1 / 4 of the world's total, and the market is huge. The high-temperature parts of the steam turbine must be made of high-temperature heat-resistant materials, such as high-pressure cylinders and main steam valve bolts, etc. must be made of high-temperature materials with excellent high-temperature performance. In recent years, both at home and abroad have attached great importance to the development of high-temperature bolt technology, and countries such as Europe, America, and Japan have been at the forefront. [0003] Steam turbine bolts work under high tem...

AI Technical Summary

Problems solved by technology

Chinese patent application 200810200104.1 discloses a heat-resistant structural steel, its manufacturing method and application. The pearlite + ferrite structure is obtained through controlled rolling and controlled cooling, which has good high-temperature strength; Production costs are high, and the delayed fracture resistance, an important indicator of heat-resistant steel, is not considered, and the control of gas content is poor, and there is a greater risk of inclusions and fatigue life

Chinese patent application 201310282347.5 discloses a low-alloy multi-element high-strength heat-resistant steel and its manufacturing method. It uses high Mn plus Ni and a special modulation process, which increases the cost and production cycle, and the strength is low

[0005] Most of the existing technologies improve the high temperature resistance of the product by adding precious metals and strengthening the downstream heat treatment process; and the cost of the process is relatively high, which lacks the significance of popularization of the process

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