埋弧焊丝用H08SG盘条的生产实践

介绍首钢埋弧焊丝用H08SG盘条的生产工艺。给出生产过程控制的关键:(1)控制转炉终点w(P)≤0.007%和出钢温度不大于1 680℃,以保证成品低的磷含量;(2)使用预处理铁水(w(S)≤0.005%)和LF精炼双工艺脱硫,保证成品低的硫含量;(3)通过精炼和连铸过程对钢水的保护解决水口堵塞问题,进而控制卷渣带来的表面质量缺陷;(4)轧制过程控制钢坯开轧温度1 000～1 050℃,精轧温度900～950℃,吐丝温度840～880℃。采用此工艺生产的6.5 mm H08SG盘条化学成分稳定,钢质洁净度高,抗拉强度为650～740 MPa,金相组织为贝氏体,成品尺寸精度可控制在±0.15 mm,满足埋弧焊丝用盘条的技术要求。

Production practice of H08SG wire rod for submerged arc welding wire

To introduce the production process of H08SG wire rod for submerged arc welding wire in Shougang. The key points of process control are given： （1） controlling converter terminal phosphorus mass fraction is no more than 0. 007% and tapping temperature is no more than 1 680 ℃ in order to ensure low phosphorus content; （2） using pre-treating molten （ sulphur mass fraction is no more than 0. 005% ） and LF refine to ensure low sulphur content in finished product ; （ 3 ） resolving nozzle clogging by protecting molten steel in the course of refine and continuous cast, then controlling surface quality defect arising from slag entrainment ; （4） in the course of rolling to control billet rolling beginning temperature is from 1 000 ℃ to 1 050 ℃, finish roiling 900 ℃ to 950 ℃, wire rod laying 840 ℃ to 880 ℃. The diameter 6.5 mm H08SG wire rod produced by the process has stable chemical composition, high steel purity, the tensile strength is 650 to 740 MPa, the microstructure is bainite, finish product size precision can be controlled within ± 0. 15 mm, which satisfy the technology demands of wire rod for submerged arc welding wire.