Abstract: The Φ8 mm~12 mm rod coil of 0. 19~0.24C,1.50~1.70Mn steel 20Mn2 was produced by an 80 t DC  UHP EBT are furnace-ladle furnace(LF)- 150 mm×150 mm 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 stiring full period, in concasting 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 beginring 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.

Key words: 20Mn2 , Steel for Chain, Rod Coil, Controlling Cooling

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2535℃,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。

关键词: 20Mn2链用钢, 盘 条, 控制冷却