A cold-rolled steel plate for enamel and its manufacturing method

Abstract

The invention discloses a cold-rolled steel plate for enamel, the mass percentage of chemical elements is: 0<C≤0.002%; Mn: 0.10-0.50%; 0<P≤0.085%; S: 0.015-0.055%; Al≤0.01 %; 0<N≤0.010%; 0<O≤0.050%; B≤0.015%; Nb≤0.10%; V≤0.10%; Ti≤0.10%; Sb≤0.10%; Co≤0.10%; the balance is Fe and other unavoidable impurities. In addition, the present invention also discloses a method for manufacturing the above-mentioned cold-rolled steel plate for enamelling, the steps of which include: (1) preparing a slab (2) hot rolling (3) pickling (4) cold rolling (5) degreasing (6) Decarburization annealing: the annealing temperature is 750-900°C, the annealing time is 30s-30min, the atmosphere in the annealing furnace includes hydrogen and nitrogen, the hydrogen content is 20-80%, and the dew point is 50-80°C (7) smooth. The cold-rolled steel plate for enamel described in the present invention has extremely low carbon content, is especially suitable for the requirements of one-time enamelling process, can significantly reduce the thickness of the porcelain layer, has excellent resistance to pinhole defects and enamel surface quality, and also has excellent Anti-scale explosion performance.

Description

technical field [0001] The invention relates to a metal material and a manufacturing method thereof, in particular to a steel plate and a manufacturing method thereof. Background technique [0002] With the development and wide application of the one-shot enamel coating process and electrostatic powder in the enamel industry, the production process of enamel products has become more automated and continuous, which is not only energy efficient, but also environmentally friendly. The optimization of the production process of enamel products has also greatly improved the quality of enamel products. The porcelain layer of enamel products has become thinner and more uniform in thickness, with higher corrosion resistance and wear resistance, and surface and appearance quality. higher. Compared with the wet enamel coating process, the thickness of the ceramic layer can be reduced to below 150 μm or even below 100 μm by using the electrostatic dry powder coating process. As the th...

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Problems solved by technology

However, it is difficult to ensure that the carbon content of the finished product is stably controlled below 20ppm

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