摘要
杭钢采用80 t超高功率直流偏心底电弧炉-钢包炉(LF)-150 mm×150 mm连铸-高速线材轧机试制了20Mn2(%:0.19～0.24C,1.50～1.70Mn)链用钢Φ8 mm和Φ12 mm盘条.LF冶炼时将钢中酸溶铝控制在0.020%～0.025%,喂硅钙线并全程吹氩,连铸时采用长水口,钢水过热度为25～35 ℃,使钢水纯净度较高,全氧含量为(22～31)×10-6,夹杂物≤2.0级.通过控制开轧温度950～980 ℃、终轧温度820～860 ℃和轧后延迟性冷却工艺,钢的晶粒度为8～10级,屈服强度为620～650 MPa,抗拉强度835～875 MPa,延伸率15%～18%,热轧材硬度(HB)175～195,满足标准和使用的要求.
The Φ8mm～12mm rod coil of 0.19～0.24C, 1.50～1.70Mn steel 20Mn2 was produced by an 80t DC UHP EBT arc furnace-ladle furnace （LF）-150mm×150mm concasting- high speed rod rolling mill process at Hangzhou Steel. During LF refining, the soluble aluminium in steel was controlled between 0.020% and 0.025% with feeding Silicon- calcium wire and argon stirring full period, in coneasting the long nozzle was adopted and the over heat of liquid steel was between 25 ℃ and 35 ℃, therefore the cleanliness of steel was higher that the total oxygen content in steel was between （22～31）×10^-6 and the inclusion rating was ≤2.0. With controlling beginning rolling temperature between 950℃ and 980℃, finishing temperature between 820℃ and 860℃, and after rolling delay cooling process the grain size of steel was 8～10 class, yield strength 620～650 MPa, tensile strength 835～875 MPa, elongation 15%～18% and hardness （HB） of hot rolled products 175～195 to meet the requirement of standard and service.
出处
《特殊钢》
北大核心
2005年第6期57-58,共2页
Special Steel
