Preparation method of low-carbon steel plate for manufacturing portable fire extinguisher

The invention discloses a preparation method of a low-carbon steel plate for manufacturing a portable fire extinguisher. Cold-rolled low-carbon steel with high tensile property is produced by using a CSP (thin slab casting and rolling) production line, a cold continuous rolling mill, a cover annealing process and the like. When the steel coil produced by the method is used for manufacturing a portable fire extinguisher shell, the yield strength of a product is moderate, the yield ratio is small, and the elongation, the strain hardening index n value, the plastic strain ratio r value and the like of the product are relatively high; the product is easy to machine and manufacture, machining methods such as stamping and drawing are high in adaptability and good in mold adaptability, the fire extinguisher shell with the depth reaching 220 mm can be produced, and the yield is high. 本发明公开了一种用于制做手提式灭火器的低碳钢板制备方法，本发明利用CSP(薄板坯连铸连轧)产线、冷连轧轧机、罩式退火工艺等生产一种具有较高拉伸性能的冷轧低碳钢。利用此发明生产的钢卷制造手提式灭火器外壳，其产品屈服强度适中，屈强比小，产品延伸率、应变硬化指数n值、塑性应变