PCCP用预应力钢丝生产工艺

Production technology of prestressed wire for PCCP

PCCP用预应力钢丝断丝会导致混凝土管道壁开裂,其中大多数断丝是由于应力腐蚀开裂造成的.通过钢丝的化学成分、显微组织、加工工艺和表面质量分析钢丝应力腐蚀的影响因素,以Φ13.0 mm80钢和YL82B-1钢盘条生产1 570 MPa级Φ7.0 mm钢丝为例,给出低应力管道用钢丝的原料选择、酸洗、烘干、拉拔、冷却、表面质量等生产过程控制要点.该工艺生产的Φ7.0 mm 1 570 MPa级钢丝抗拉强度为1 630～1 700 MPa,扭转次数在10次以上,扭转断口平齐,无螺形开裂和表面错裂,应力腐蚀试验最高200 h不断,达到国内领先水平.

Fracture of prestressed wire for PCCP can cause concrete pipe wall cracking, most of the wire fracture are caused by stress corrosion cracking. To analyze the ＇affecting faetors of steel wire corrosion cracking through steel wire＇ s chemical composition, microstructure, working process and surface quality and to take 1570 MPa diameter 7.0 mm steel wire produced by diameter 13.0 mm 80 steel and YL82B - 1 steel wire rod for example, and give production process control points of steel wire for low stress pipe by raw material choosing, pickling, baking, drawing, cooling and surface quality etc. This technology can produce diameter 7.0 mm 1 570 MPa steel wire with tensile strength 1 630 -1700 MPa, more than lO times torsion with even fracture, no screw type cracking and surface fault fracture, stress corrosion testing can keep a maximum of 200 hours and reach domestic leading level.