0Cr13C铁素体不锈钢冷拔断丝分析及工艺改善

An Analysis on Wire Fracture in Cold-Drawing of Ferrite Stainless Steel 0Cr13C and Process Improvement

0Cr13C钢(/%:0.02C,0.32Si,0.18Mn,0.016P,0.002S,12.25Cr,0.0140N)冷拔丝的工艺为Φ5.5mm热轧退火材(680~700℃退火)-冷拔至Φ2.0 mm材-氢气退火-冷拔至Φ0.70 mm丝-氢气退火-冷拔至Φ0.3mm丝。通过成分、断口、组织和力学性能分析,得出退火Φ5.5 mm热轧材为混晶组织,强度较高,造成冷拔时变形不均和断丝。通过720~760℃退火试验表明,随退火温度升高,抗拉强度降低,720、740、760℃退火后0Cr13C钢Φ5.5 mm热轧材的抗拉强度分别为471~503 MPa,417~448 MPa和378~417 MPa。生产结果表明,通过将Φ5.5mm热轧盘条的退火温度从原680~700℃2 h提高至740℃3~4 h,每台冷拔机的平均断丝率由6次/12 h降至2次/12 h。

The process for cold-drawn wire of steel 0Cr13C （/% ： 0. 02C, 0. 32Si, 0. 18Mn, 0. 016P, 0. 002S, 12. 25Cr, 0. 014 ON） is cbS. 5 mm hot-rolled rod annealed at 680 ~ 700 ℃-cold-drawing to φ2. 0 mm coil-hydrogen annea- ling （HA） -cold-drawing to φ0. 70 mm wire-HA-cold-drawing to φ0. 3 mm wire. With analysis on composition, fracture, structure and mechanical properties of steel, it is obtained that the φ5.5 mm annealed hot-rolled coil has mixed grain structure and higher tensile strength led to non-homogeneous deformation and wire fracture during cold-drawing process. Test results of annealing at 720 -760 ℃ show that with increasing annealing temperature the tensile strength of steel 0Cr13C decreases, the tensile strength of q^5.5 mm rod annealed at 720 ℃, 740 ℃ and 760℃ is respectively 471 ~ 503 MPa, 417 -448 MPa and 317 -417 MPa. The production results show that by increasing annealing temperature of Φ5.5 mm hot- rolled coil from original 680 - 700℃ for 2 h to 740℃ for 3 ~ 4 h, average ratio of wire fracture at each cold-drawing bench decreases from 6 times/12 h to 2 times/12 h.