Continuous annealing low-alloy and high-strength steel plate and production method thereof

Abstract

A continuously annealed low-alloy high-strength steel plate and its production method, the mass percentage of its components is: C 0.06~0.10%, Si≤0.50%, Mn 0.6~1.2%, P≤0.025%, S≤0.025%, N≤50ppm, Als 200~500ppm, Nb 0.030-0.060%, the rest is iron and inevitable impurities. This high-strength steel plate adopts a low-carbon design, and the material strength is enhanced through Si and Mn solid solution strengthening. Through separate Nb micro-alloying, the material strength is improved while still maintaining good shape; this high-strength steel plate does not use Ti elements for processing. Microalloying is beneficial to the stability of finished product performance; this high-strength steel plate has good strength, plasticity and formability. This method adds an appropriate amount of Si element and purifies the ferrite matrix, so that the steel obtained has good shaping. At the same time, combined with the relevant continuous retreat process parameters, the material has continuous yield characteristics, ensuring that the user can The surface quality of the product.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a continuous annealing low-alloy high-strength steel plate and a production method thereof. Background technique [0002] With the improvement of automobile safety performance requirements, more and more high-strength steels with good strength and plasticity are used in the manufacture of automobile bodies. On the one hand, the weight of the car body can be reduced without losing the safety performance of the car; on the other hand, the fuel consumption of the car can be reduced and the environmental pollution can be reduced; therefore, high-strength steel is used more and more in the manufacture of car bodies, especially in some safety parts and structures piece production. However, the traditional microalloyed high-strength steel is still widely used in the manufacture of auto parts due to its good yield ratio and weldability. And other microalloying elements to improve the str...

AI Technical Summary

Problems solved by technology

Traditional micro-alloyed high-strength steels all contain Ti. As described in the continuous annealing process of cold-rolled low-alloy high-strength steel plates with a yield strength of 420MPa (authorized announcement number: CN102492823B), an appropriate amount of Ti alloying is used. Due to the high activity of Ti, It exists in various forms and is difficult to control, which will lead to huge fluctuations in material properties and is not conducive to the shaping of materials

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