共查询到16条相似文献,搜索用时 218 毫秒
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国内某1 780 mm热连轧机组因精轧机工作辊表面氧化膜剥落而严重影响带钢表面质量,导致每月约有1 500 t钢卷被判为废次品。从轧辊材质、轧辊冷却水、防剥落水、轧制润滑及切水板等方面分析了轧辊表面氧化膜剥落的原因,并通过优化轧辊冷却水、调整防剥落水喷射位置、消除集管间相互干扰、改造切水板配置等技改方案解决了热轧生产中轧辊表面氧化膜剥落的问题,因氧化膜剥落产生的热轧卷废次品减少了90%以上,企业降废增效成果显著。 相似文献
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轧辊表面氧化膜的形成及剥落对轧辊的消耗及产品质量有显著影响。采用VL2000DX-SVF18SP型超高温激光共聚焦显微镜观察了高铬铸铁、高铬铸钢和高速钢在连续加热及等温过程中其表面氧化膜形成的特征,同时对比研究了这3种材料在循环加热、冷却后的氧化行为。结果表明,高铬铸铁和高铬铸钢开始形成氧化膜的温度较低,约为300 ℃,但氧化膜致密均匀,抑制了高温及等温过程氧化膜的生长;而高速钢氧化膜开始形成温度较高,氧化膜快速形成的温度约为480 ℃,但氧化膜均匀性差,具有较快的生长速率,高速钢的抗氧化性显著低于高铬铸铁和高铬铸钢。 相似文献
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轧辊表面氧化膜的形成及剥落对轧辊的消耗及产品质量有显著影响。采用VL2000DX—SVF18SP型超高温激光共聚焦显微镜观察了高铬铸铁、高铬铸钢和高速钢在连续加热及等温过程中其表面氧化膜形成的特征,同时对比研究了这3种材料在循环加热、冷却后的氧化行为。结果表明,高铬铸铁和高铬铸钢开始形成氧化膜的温度较低,约为300 ℃,但氧化膜致密均匀,抑制了高温及等温过程氧化膜的生长;而高速钢氧化膜开始形成温度较高,氧化膜快速形成的温度约为480 ℃,但氧化膜均匀性差,具有较快的生长速率,高速钢的抗氧化性显著低于高铬铸铁和高铬铸钢。 相似文献
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Kyungzoon Min Kisoo Kim Sung Kyu Kim Doh-Jae Lee 《Metals and Materials International》2012,18(2):341-348
An oxide layer, which developed on the surface of a commercial hot rolling mill, was examined by forcibly stopping the roller
between mill stands during activity. Liquid quartz was sprayed on the strip to prevent further oxide layer growth during cooling
after stopping the hot-rolling mills. Then the thickness and shape of the oxide layer was examined in a cross-sectional view
using an optical microscope. The thickness of the oxide layer increased through the 1st and 2nd passes of hot rolling, and then decreased through successive rolling, because the thickening rate by growth is larger than
the thinning rate by deformation in high temperature. The temperature distributions of the oxide layer as well as the strip
were predicted using the thermo-mechanical finite element method. As thermal conductivity of the oxide layer is low, the temperature
deviation of the oxide layer increases and average temperature decreases as the thickness of the oxide layer increases, suggesting
the increased formation of surface defects. With these results, a new cooling device was installed between the hot rolling
mills to decrease the surface temperature and the thickness of the oxide layer, resulting in improved surface quality of the
strip. 相似文献
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针对采用抛丸毛化轧辊平整机平整后的马口铁基板上出现的批量色差亮线,分析了轧辊表面形貌及轧辊表面发生剥落的原因,提出除需保持机架内腔、工作辊和支撑辊表面洁净外,还需尽量减少抛丸次数,采用圆形或圆形与菱形混合丸料,可避免轧辊表面出现“层状翘起组织”,从而控制带钢表面的“亮线”缺陷。 相似文献