TRIP steel plate for high strength cold rolling hot dip galvanizing and preparation thereof

Abstract

The invention pertains to the metal material processing field and particularly provides a TRIP steel sheet used for high-strength cold rolling and hot galvanizing and a manufacturing method thereof. The TRIP steel sheet comprises the following components: 0.1wt percent to 0.4wt percent of C, not more than 0.06wt percent of Si, 0.5wt percent to 2.5wt percent of Mn, 0.5wt percent to 2.0wt percent of Al, not more than 0.03wt percent of P, not more than 0.02wt percent of S, 0.01wt percent to 0.10wt percent of Nb, 0.01wt percent to 0.10wt percent of Ti, 0.1wt percent to 1.0wt percent of Cu, 0.1wt percent to 0.6wt percent of Ni and the rest is iron. Through the measures of controlling the content of the elements such as C, Mn, Nb and Ti in the steel, and the temperature and time of hot rolling, reeling, cold rolling, annealing and the like, the comprehensive performance of the TRIP steel sheet is improved. Compared with the traditional TRIP steel, the TRIP steel sheet has the following advantages of: 1) good platability: due to the low silicon adopted, the requirements of the plating layer of hot plated pure zinc and alloy plated zinc can be met to obtain the plating layer with good performance; and 2) good grain refining effect: due to Nb micro-alloying, grain can be effectively refined.

Description

[0001] The invention belongs to the field of metal material processing, and in particular provides a high-strength cold-rolled hot-dip galvanized transformation-induced plasticity (TRIP) steel plate and a preparation method thereof. Background technique: [0002] The automotive industry requires weight reduction, which means using stronger materials to be able to reduce the thickness of components without giving up safety and functional requirements. Ultra-high-strength steel (UHSS) sheet products, especially phase-change-induced Plastic (TRIP) steel products offer a solution to this problem due to their outstanding combination of high strength and good formability. Furthermore, it is often required to increase the corrosion resistance of the above-mentioned steel sheet products by means of electro-galvanizing or hot-dip galvanizing. [0003] In traditional TRIP steel, the main components are 0.12-0.55% C, 0.2-2.5% Mn, 0.4-1.8% Si (mass percentage). Among these alloying elemen...

AI Technical Summary

Problems solved by technology

Compared with Si element, aluminum is a weak solid solution strengthening element. When silicon is completely replaced by aluminum, it will have a negative effect on the strength-plasticity balance of TRIP steel. At this time, although the elongation of steel can remain at the same level , but the tensile strength of steel is greatly reduced

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