通过采取低碳和复合微合金化成分设计,结合莱钢中型线现有冶炼及轧制工艺设备状况,合理制定了冶炼及连铸工艺和控制轧制工艺参数,并采用轧后空冷方式,成功开发了翼缘厚度9~15 mm欧标S355NL热轧H型钢。经检验,产品各项指标均满足欧标BS EN10025-3标准要求,钢中夹杂物比较少,钢质纯净,组织为铁素体和珠光体,组织细小均匀,使产品具有优异的低温冲击性能。 Through the design of low-carbon and composite micro-alloying components, the existing smelting and rolling process equipment status of Laiwu Steel’s medium-sized line, the reasonable smelting and continuous casting process and the control rolling process parameters were formulated, and the post-rolling air-cooling method was used successfully Development of the flange thickness of 9 ~ 15 mm European standard S355NL hot-rolled H-beam. After testing, the product of the indicators are to meet the European standard BS EN10025-3 standard requirements, less steel inclusions, steel pure, organized ferrite and pearlite, fine and even organization, the product has excellent low temperature impact properties .