Steel plate for stamping and quenching and manufacturing method thereof

Abstract

The invention discloses a steel plate for stamping and quenching and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.14 to 0.28 percent of C, less than 0.40 percent of Si, 0.4 to 2.0 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, 0.016 to 0.040 percent of Al, 0.15 to 0.8 percent of Cr, 0.015 to 0.12 percent of Ti, 0.001 to 0.005 percent of B, less than or equal to 0.005 percent of N, and the balance of Fe and unavoidable impurities. The manufacturing method comprises the following steps of: heating a blank to 1,150 to 1,250 DEG C, preserving heat for 2.5 to 4 hours and performing rough rolling, and then performing finish rolling under multichannel pressure and at the final rolling temperature of between 830 and 950 DEG C, performing laminar cooling, and cooling to the rolling temperature at the cooling speed of more than 10 DEG C / s and the rolling temperature of between 600 and 680 DEG C. The cold-rolled steel plate is obtained by the following steps of: performing cold rolling on a hot rolled steel strip, annealing through a pure hydrogen gas cover furnace, and oiling and packaging. The annealing temperature is 550 to 650 DEG C and the heat preserving time is 3 to 5 hours. The steel has a simple component design and high hardenability. The depth of a hardening layer of more than HRC45 is 10 to 16mm. The steel plate consists of ferrite and pearlite. After thermal stamping and quenching, an all-martensite structure can be obtained. The tensile strength is above 1,300N / mm<2>.

Description

technical field [0001] The invention relates to a steel plate for stamping and quenching and a manufacturing method thereof. The thermoformed product prepared by using the steel plate of the invention is mainly used for anti-collision parts and strength reinforcement parts of automobiles. Background technique [0002] In order to improve the effective fuel utilization rate, safety and environmental standards of automobiles, the automobile manufacturing industry is forced to reduce the weight of automobiles and at the same time ensure the safety of collisions, so it is required to increase the strength of parts. The use of ultra-high-strength steel plates is an important way to achieve lightweight vehicles. The biggest problem in using ultra-high-strength steel plates to produce automotive parts at room temperature is the limitation of forming and springback. In the traditional design, most of the parts such as A-pillar, B-pillar, reinforcement plate and anti-collision beam ...

AI Technical Summary

Problems solved by technology

The steel plate has good hardenability, and the ultra-high-strength structural parts above 1300MPa are produced by hot stamping, which are used to manufacture collision parts, support parts and reinforcement parts of automobiles, and solve the problem of complex steel plate composition and smelting in the prior art. Difficult to control and other issues

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