北京科技大学采用定向凝固与低温强加工结合技术 ,将桥用钢丝的强度提高到 2 0 0 0MPa以上。该技术的基本原理是 ,采用连铸定向凝固技术 ,成形为沿拉坯方向 (长度方向 )具有连续柱状晶组织的铸棒 ,然后在无再结晶条件下对铸棒进行大延伸变形加工 (即低温强加工 ) ,使铸棒由原来 Beijing University of Science and Technology using directional solidification combined with low temperature processing technology, the bridge wire strength to 20000MPa above. The basic principle of this technique is that the casting rod with continuous columnar crystal structure along the casting direction (length direction) is formed by the continuous casting directional solidification technique, and then the casting rod is subjected to a large extension deformation without recrystallization Low temperature strong processing), so that cast rods from the original