A cold-rolled steel plate for enamel and its manufacturing method
A technology of cold-rolled steel plate and enamel, which is applied in the field of metal materials and its manufacturing, can solve the problems such as difficulty in ensuring the carbon content of finished products, and achieve the effects of improving the surface quality of enamel, improving efficiency, and preventing pinhole defects
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[0099] The cold-rolled steel sheet for enamel of the present invention adopts the following steps to obtain:
[0100] (1) Preparation of slab: molten iron is cast into slab after converter smelting and refining, wherein the carbon content in molten steel after refining is ≤0.04%;
[0101] (2) Hot rolling: control the heating temperature during hot rolling to be 1100 to 1250 °C, the final rolling temperature to be 800 to 950 °C, and then cool to a coiling temperature of 600 to 750 °C;
[0102] (3) Pickling;
[0103] (4) Cold rolling: control the total reduction ratio of cold rolling ≥ 65%;
[0104] (5) Degreasing;
[0105] (6) Decarburization annealing: the annealing temperature is 750~900℃, 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℃;
[0106] (7) Flattening: control the flattening reduction rate ≤5%.
[0107] Table 1 lists the mass percentage ratio of e...
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