Hot rolled steel plate for precision stamping and manufacturing method thereof

Abstract

The invention provides a hot rolled steel plate for precision stamping, which comprises, by weight, the following chemical constituents: 0.05-0.30% of C, not more than 0.50% of Si, 0.05-1.50% of Mn, not more than 0.02% of P, not more than 0.01% of S, 0.05-1.50% of Cr, not more than 0.04% of Alt, 0.02-0.50% of Ni; the hot rolled steel plate also comprises one or two of Ti and B, wherein the steel plate comprises not more than 0.05% of Ti, 0.0005-0.010% of B, not more than 0.50% of Ni+Ti+B, and the balance of iron and unavoidable impurities. The invention also provides a manufacturing method of the hot rolled steel plate, which comprises the following steps: pre-desulfurization of molten iron; converter smelting; secondary refining; continuous casting; reheating of slabs at a heating temperature of 1100-1250 DEG C; rolling with a termination temperature of finish rolling of 780-950 DEG C; coiling at a coiling temperature of 500-700 DEG C; spheroidizing annealing at a spheroidizing annealing temperature of 700-740 DEG C. The steel plate of the present invention not only is easy to precision stamping, but also has well balanced strength and toughness.

Description

technical field [0001] The invention relates to a steel material, especially a hot-rolled steel plate for precision stamping and a manufacturing method thereof. Background technique [0002] Hot-rolled strip steel is mainly produced by hot rolling mills. After spheroidizing annealing, the strength and plasticity are well matched. It is widely used in the fine blanking industry to manufacture automobiles, motorcycles, electric bicycles, tractors, hardware, home appliances, switch appliances, Sewing machines, cameras, clocks, instruments, communication electronics and other precision parts. Traditional precision parts processing methods have many processes and poor precision, and are generally completed by general punching, machining, forging, casting and powder metallurgy processing. After the fine blanking process is adopted, the entire part can be manufactured in one process, which has great technical advantages and economic benefits. However, fine blanking has strict req...

AI Technical Summary

Problems solved by technology

However, fine blanking has strict requirements on the internal quality of the material, and the steel used for fine blanking is generally low-carbon steel. In order to achieve good fine blanking performance, the steel plate is required to have lower strength and high plasticity

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