Dispersion strengthened microalloy high strength steel and production method thereof

Abstract

The invention discloses dispersion strengthening microalloy high-strength steel. The dispersion strengthening microalloy high-strength steel comprises 0.05%-0.06% of C, 0.01%-0.02% of Si, 0.47%-0.53% of Mn, 0.02%-0.05% of Al, smaller than or equal to 0.010% of P, smaller than or equal to 0.006% of S, 0.09%-0.10% of V, 0.007%-0.008% of N, 0.02%-0.03% of Ni, 0.02%-0.04% of Th, 0.012%-0.018% of Zr, and the balance Fe and inevitable impurities. The production steps include molten iron desulphurization, converter steelmaking, vacuum treatment, continuous casting, slab heating, rolling, coiling, acid pickling, cold continuous rolling, heat treatment and finishing. The content of alloy components is designed reasonably, the technology can be controlled, the mechanical performance is good, the welding performance, the rebound performance and the anti-delay fracture performance are excellent, and the dispersion strengthening microalloy high-strength steel can be applied to manufacturing automobile structural pieces and strengthening pieces.

Description

technical field [0001] The invention relates to the field of low-alloy structural steel manufacturing in iron and steel metallurgical materials, in particular to a dispersion-strengthened micro-alloy high-strength steel and a production method thereof. Background technique [0002] In the field of automotive structural steel, with the development of practical applications, the requirements for the comprehensive performance of steel are becoming increasingly stringent, not only requiring excellent mechanical properties, but also requiring good formability, welding performance, rebound performance and anti-delay Fracture performance. Studies have shown that in the production process of high-strength steel, due to the particularity of its composition and high performance requirements, its production process is extremely harsh, and the yield and production efficiency are low. [0003] The article titled "The Effect of Microalloying Elements on the Microstructure and Properties ...

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Problems solved by technology

Studies have shown that in the production process of high-strength steel, due to the particularity of its composition and high performance requirements, its production process is extremely harsh, while the yield and production efficiency are low

[0003] The article titled "The Effect of Microalloying Elements on the Microstructure and Properties of V-N Medium Carbon Microalloyed Steel" studies the effects of the type, content and production process of microalloying elements on the microstructure and properties of V-N medium carbon microalloyed steel. If the content of carbon and silicon is too high, it will bring difficulties to smelting and rolling. The slab is prone to edge cracking, and the hot-rolled plate will also be edge cracking. Moreover, the content of carbon and silicon is too high, which makes welding difficult, which will also lead to springback in stamping.

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