Ultra-low carbon cold-rolling deep-punching glassed steel and method of production

Abstract

The present invention relates to ultralow carbon cold rolled deep drawing glass-lined steel and its production process. The glass-lined steel has the chemical components including C 0.002-0.005 wt%, Si 0.004-0.020 wt%, Mn 0.08-0.13 wt%, P 0.006-0.020 wt%, S 0.01-0.035 wt%, Als 0.010-0.040 wt%, Ti 0.05-0.09 wt%, N not more than 0.004 wt%, and Fe and inevitable impurities for the rest. The steel of the present invention is superior to IF steel, and has raised Ti and S contents for effective separation of biphase Ti4C2S2 particle, and effective fixing of H atom to avoid scale burst of enamel. It has excellent deep drawing performance and excellent enameling performance.

Description

technical field [0001] The present invention relates to steel and its production method, in particular enamelled steel and its production method. Background technique [0002] In recent years, the enamel industry has an increasing demand for cold-rolled thin steel plates, with an annual demand of 150,000-200,000 tons, of which nearly 50,000 tons are used for high-end luxury enamel bathtubs. [0003] At present, the highest level of enamelled steel is deep-drawing grade, which can only be stamped for enamel bathtubs with a depth of less than 330mm, and often cracks, while for enamel bathtubs with a depth of more than 330mm, only direct casting can be used. [0004] There are also some manufacturers who use ordinary ultra-deep drawing cold-rolled sheets, such as SC3 in China's national standard GB / T5213-2001, that is, IF (interstitial atom-free) steel. The chemical composition requirements are shown in Table 1: [0005] Table 1: [0006] Grade C Si mn ...

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Problems solved by technology

[0007] Although the ultra-deep-drawing cold-rolled sheet has good deep-drawing performance, it is generally used as steel for ultra-deep-drawing parts of automobiles, but its coating performance is poor. This is due to the poor hydrogen storage ability of the ultra-deep-drawing cold-rolled sheet After enamelling for a period of time, hydrogen gas comes out of the steel, which is prone to scale explosion defects in the enamel

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