High-strength and high-rigidity structural steel for automobile framework and production method of high-strength and high-rigidity structural steel

Abstract

The invention discloses high-strength and high-rigidity structural steel for an automobile framework. The high-strength and high-rigidity structural steel for the automobile framework comprises, by weight, 0.05%-0.07% of C, 1.00%-1.20% of Si, 0.16%-0.21% of Mn, 0.70%-0.90% of Al, less than or equal to 0.010% of P, less than or equal to 0.010% of S, 0.01%-0.02% of Nb, 0.02%-0.04% of Ti, 0.02%-0.04% of Se, 0.01%-0.02% of Nd, and the balance Fe and inevitable impurities. A gold-phase texture is a combination of ferrite and pearlite, and the grain size is above level 13.5. A production method includes the steps of molten iron desulphurization, converter steelmaking, vacuum treatment, continuous casting, slab heating, rolling, winding, acid pickling, cold continuous rolling, heat treatment and finishing. According to the high-strength and high-rigidity structural steel for the automobile framework and the production method of the high-strength and high-rigidity structural steel, cost is low, the process is reasonable and controllable, the comprehensive product performance is excellent, and the high-strength and high-rigidity structural steel for the automobile framework can be widely applied to automobile frameworks or chassis components.

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 high-strength and high-rigidity structural steel for automobile frames and a production method thereof. Background technique [0002] With the increasing environmental pollution and energy crisis, the restrictions on automobile emissions are becoming more and more stringent, and the weight reduction of the car body has become a common issue faced by all automobile companies. Using high-strength and ultra-high-strength steel plates instead of mild steel, and reducing the thickness of parts to achieve weight reduction without reducing the performance of the vehicle and parts is a lightweight design method widely used in the automotive industry. However, the thickness reduction will inevitably reduce the stiffness of the material. [0003] The article entitled "The Effect of the Use of High-Strength Steel on the Rig...

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Problems solved by technology

However, the thickness reduction is bound to reduce the stiffness of the material

[0003] The article entitled "The Effect of the Use of High-Strength Steel on the Rigidity of the Bus Frame" analyzes the influence of the use of high-strength steel on the stiffness of the bus frame. The article introduces the comparative stiffness of Q235, Q345Q and QSTE700TM steel. , its stiffness is reduced and cannot fully meet the needs of practical applications

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