Anneal technique for producing SPCC steel grade with zincing wire annealing oven

Abstract

An annealing process of producing SPCC steel in annealing furnace on galvanizing line belongs to the field of the heat treatment technology of metal. Using the process can also meet the strength and plasticity requirement of strip steel on continuous annealing line. The method comprises the following procedures: the steel is heated to 630 minus or plus 20 DEG C by open fire; the steel is heated to 760 minus or plus 20 DEG C by a radiant tube; dew point is controlled below minus 40 DEG C; the steel is maintained at 710 minus or plus 20 DEG C by radiant tube; dew point is controlled below minus 40 DEG C; the strip steel is sprayed to 210 minus or plus 20 DEG C, the dew point of the first area of the spray section is controlled below minus 60 DEG C; and is cooled to 160 minus or plus 20 DEG C. The method can be used on the annealing furnace of the galvanizing line and be suitable for annealing of SPCC steel. The method can eliminate the internal stress of the rolling processing of strip steel, promote the plasticity and the toughness of the strip steel, and meet the strength and the plasticity requirement of the strip steel on the continuous annealing line. The tensile strength of product is approximately at 380Megapascal, the yield strength is below 330Megapascal, and the elongation is more than 36 percent. The grain size of product stabilizes between 11 and 13 Mum, the elongation and the stamping property are all at the higher level. The method can avoid the idle of the production equipment of galvanizing line and reduce the depreciation loss of equipment.

Description

technical field

[0001] The invention relates to an annealing process, in particular to an annealing process for producing annealed plates in an annealing furnace of a cold-rolled sheet galvanizing line, and belongs to the technical field of metal heat treatment. Background technique

[0002] The cold-rolled sheet galvanizing line is a special production line for the production of cold-rolled galvanized sheets. The continuous annealing furnace with an open flame heating section used in this production line has a complex structure, high strip speed, and difficult control. At present, many large, medium and small galvanizing lines have been built and put into operation, but due to the influence of equipment level and market factors, except for the galvanizing lines of several large steel mills, almost all other galvanizing lines are in a state of suspension or semi-stop production . In order to improve the utilization rate of equipment and reduce the loss caused by vacant equi...

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