YL82B预应力钢丝及钢绞线用盘条试制

介绍YL82B预应力钢丝及钢绞线用盘条试制过程。转炉采用高拉碳工艺,控制终点w(C)≥0.30%,双渣法脱磷,加强出钢挡渣,减少回磷;LF精炼造高碱度还原渣,并适当延长出站前软吹时间;加强连铸过程保护浇注,采用适当低的钢水过热度浇注,以及合理的结晶器电磁搅拌参数,拉速波动控制在±0.1 m/min;轧制过程开轧温度975~1 010℃,精轧温度890~930℃,吐丝温度820~850℃,终轧速度22 m/s。生产的盘条同圈时效15 d后抗拉强度为1 156~1 172 MPa,断面收缩率为41%~43%。12.5 mm盘条拉拔至5.0 mm,拉拔过程无断丝,成品钢丝抗拉强度为1 930~1 950 MPa,反复弯曲11~12次。

Trial of YL82B prestressed steel wire and wire rod for steel strand

To introduce the trial production process of prestressed steel wire and wire rod for steel strand. Converter use high catch carbon technology, control the end point w （C） ≥ 0.30%, and double slag desulphurization, strengthen slag- blocked tapping, reduce the rephosphorization; LF refine high basicity slag reduction, and properly prolong the station soft blowing time; strengthen the continuous casting process protection casting, use appropriate low liquid steel superheat cast- ing, and reasonable mold electromagnetic stirring parameters, control the speed fluctuation at ＋ O. 1 m/min; start rolling temperature of rolling process is 975 - 1 010 ~C, finishing temperature is 890 -930 ~C, wire rod laying temperature is 820 ~ 850 ~C ,finished rolling speed is 22 m/s. The tensile strength of wire rod is 1 156 - 1 172 MPa after aging of 15 d, reduc- tion of area is 41% -43%. Diameter 12.5 mm wire rod is drawn to diameter 5.0 mm, and has no broken wire in the draw- ing process, the tensile strength of finished steel wire is 1 930 ~ 1 950 MPa, reverse bending is 11 ~ 12 times.