Production process for barrel-making hot dip galvanized steel strip

Abstract

The invention relates to a production process for a barrel-making hot dip galvanized steel strip, and belongs to the technical field of galvanized steel strips in the metallurgical industry. According to the technical scheme, the barrel-making hot dip galvanized steel strip consists of the following chemical components in percentage by mass: less than or equal to 0.07% of C, less than or equal to 0.025% of Si, less than or equal to 0.25% of Mn, less than or equal to 0.025% of P, less than or equal to 0.020% of S, 0.015-0.065% of Als, less than or equal to 30 ppm of T[O], less than or equal to 30 ppm of T[N], the balance iron and inevitable impurities. The production process comprises the following process steps: controlling the mass percentage of the components at a converter smelting end-point as follows: 0.03-0.07% of C, less than or equal to 0.020% of P, and less than or equal to 0.015% of S; (2) controlling a finish rolling temperature of hot rolling to be 885-905 DEG C, and controlling a coiling temperature to be 685-725 DEG C; (3) controlling a cold-rolling total reduction rate to be 70%-85%; and (4) controlling a plate temperature in a continuous annealing furnace to be 670-700 DEG C. The production process has the beneficial effects of reducing the production cost, improving the product performances and meeting using requirements.

Description

technical field [0001] The invention relates to a production process of a hot-dip galvanized steel strip for making barrels, and belongs to the technical field of galvanized steel strip production in the metallurgical industry. Background technique [0002] At present, there is no steel type specially used for the production of galvanized barrels in galvanized steel strip products. During the processing of hot-dip galvanized steel strip barrels, it is necessary to accept punching and bending deformation, and the material is required to have good stamping and Shapeshifting ability. [0003] DQ-grade galvanized products are generally used for conventional barrel materials, and the following problems exist with this product as barrel materials: [0004] (1) The composition mass percentage of this product is C: ≤0.03%, Si: ≤0.020%, Mn: ≤0.20%, P≤0.020%, S≤0.020%, of which the content of C element is low, and the production cost of steelmaking is relatively CQ grade The product...

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Problems solved by technology

[0005] (2) The annealing temperature in the galvanizing process is high, and the production cost is increased by about 50 yuan;

[0006] (3) DQ-grade galvanized products are mainly used for stamping, and the performance advantages of DQ-grade products cannot be fully utilized for barrel making, resulting in waste of material performance and low material utilization

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