摘要
对热轧工序炉生氧化铁皮、二次氧化铁皮、三次氧化铁皮及非常规条件产生的氧化铁皮的影响因素进行了详细分析,并制定了有效控制措施。对于炉生氧化铁皮,通过合理制定加热工艺,加热温度主体控制在1150~1250℃范围内,调整空燃比炉压微正压,防止炉头炉尾吸冷风或冒火等,烧损率降低至0.6%;对于二次氧化铁皮缺陷,通过降低开轧温度至1060~1100℃,中间坯厚度≤28 mm,并保证除鳞压力不低于20 MPa及粗轧辊辊面质量,可以明显改善缺陷;对于三次氧化铁皮,采取低温快轧可以减薄钢带表面氧化铁皮厚度,利于冷轧酸洗;降低卷取温度至590℃,可以改善边部红锈缺陷。提高生产设备管控水平,尤其是改善精轧前与轧件接触的设备状况,可以显著降低非常规氧化铁皮压入缺陷,减少协议品量。
The influence factors of first and secondary iron oxide scale and third iron oxide scale in hot rolling process and unconventional conditions were analyzed in detail,and effective control measures were formulated.For the first oxide scale,the heating process is reasonably formulated,the heating temperature is controlled in the range of 1150~1250℃,and the air/fuel ratio is adjusted to prevent cold air absorption or fire in the furnace tail,and the burning loss rate is reduced to 0.6%.For the secondary iron oxide scale,the defects can be obviously improved by reducing the rolling temperature to 1060~1100℃,the thickness of intermediate blank to 28 mm,the descaling pressure not less than 20 MPa and the quality of rough roll surface.For the third oxide scale,low temperature fast rolling can reduce the thickness of the oxide scale on the surface of the thin steel strip,which is conducive to cold rolling and pickling.Reducing the coiling temperature to 590℃can improve the edge red rust defect.Improving the production equipment control level,especially the equipment condition in contact with the rolling parts before finishing rolling,can significantly reduce the unconventional oxide sheet pressing defects and reduce the agreed quantity.
作者
刘金英
Liu Jinying(Technical Department of Tangshan Ruifeng Iron and Steel Co., Ltd., Tangshan 063000, Hebei)
出处
《河北冶金》
2022年第6期52-56,共5页
Hebei Metallurgy
关键词
热轧
氧化铁皮
山水纹缺陷
红锈
终轧温度
卷取温度
hot rolling
oxide scale
flaw of landscape pattern
red rust
final rolling temperature
coiling temperature
