斯太尔摩工艺参数对72A钢盘条氧化铁皮剥离性能的影响

用扫描电镜和弯曲试验研究了吐丝温度和斯太尔摩风冷线Ⅰ～Ⅲ段冷却速度对72A钢盘条（/%:0.70～0.75C,0.15～0.35Si,0.35～0.60Mn,≤0.025P,≤0.025S）氧化铁皮层厚、组成结构和剥离性的影响。结果表明,氧化铁皮的剥离性主要与铁皮厚度有关,10～20μm厚的氧化铁皮具有较好的机械剥离性。FeO层与氧化铁皮的剥离性呈正相关关系,FeO层达到9μm以上具有较好的剥离性,Fe₃O₄层与氧化铁皮剥离性呈负相关关系;FeO层厚比随冷却速度的提高而增加,当吐丝温度到910℃,提高斯太尔摩风冷线各段冷却速度,Ⅰ段为6～7.5℃/s,Ⅱ段为12～20℃/s,高碳钢盘条的机械剥离性得到了有效改善。

Effect of Stelmor Process Parameters on Flaking Properties of Oxide Scale of Steel 72A Coil

The effect of wire finished rolling temperature and cooling rate at I ?HI section of Stelmor cooling line on thickness of oxide scale, ingredient and structure and flaking properties of coil of steel 72A (/% : 0. 70 ~0. 75C, 0. 15 ? 0. 35Si, 0. 35 ~0, 60Mn, ≤ 0. 025P, ≤ 0. 025S) has been studied by SEM and bending test. Results show that the descaling performance of oxide scale is mainly associated with thickness of scale, and the scale with thickness 10 ~ 12 μm has better mechanical-descaling performance ； the thickness of FeO layer is positively correlated with the descaling performance of scale, and the scale with thickness more than 9μm has better descaling performance, while the Fe₃O₄ layer is negatively correlated with the descaling performance of scale； with increasing cooling rate the thickness ratio of FeO layer increases, with outlet wire temperature up to 910℃  , increasing cooling rate of coil at Stelmor cooling line i. e. 6 ~ 7. 5 ℃ /s at I section and 12 ~ 20 °C/s at Ⅱ section the mechanical-descaling performance of high carbon steel coil is effectively improved.