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热轧工序中钢材氧化铁皮的形成受轧制工艺参数、钢种、设备等因素的影响,容易导致带钢表面质量不合格,并造成产线正常生产秩序被打乱。针对连铸连轧短流程产线低碳钢因氧化铁皮缺陷降级率高的问题,结合产线特点和轧制工艺,对氧化铁皮缺陷形成原因和控制措施进行了研究。结果表明:短流程工艺成品带钢氧化铁皮缺陷主要分为板道系﹑温度系﹑除鳞系3类。板道系氧化铁皮缺陷主要是产线辊道工况异常形成的柳叶状或纺锤状氧化铁皮压入,温度系氧化铁皮缺陷主要受轧制工艺制度的影响,除鳞系氧化铁皮缺陷主要由除鳞设备能力不足造成。通过对轧前工况设备的确认﹑使用合理的轧制温度和卷取温度,以及改造升级除鳞集管设备,将成品带钢氧化铁皮缺陷降级率由之前的10%以上降至0。 相似文献
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分析冷轧板表面线状缺陷的形貌特征,将冷轧板表面线状缺陷分为三类,分别为“线状起皮”、“黑线”、“亮线”。通过对各类线状缺陷的分析,得出了线状缺陷的形成原因。结果表明,“线状起皮”和“黑线”是由连铸坯表面皮下夹渣引起的。“亮线”则是由于轧制辊印、钢板表面花纹不同、连铸坯表面微裂纹、连铸坯皮下夹渣、热轧轧破的连铸坯皮下气泡等原因引起的。 相似文献
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帘线钢的表面裂纹缺陷和中心偏析是影响铸坯质量的关键因素。采用了铸坯表面宏观缺陷分析、裂纹微观形貌表征、Gleeble高温力学性能、中心偏析等检测手段,对帘线钢82A断面150 mm×150 mm小方坯在稳态和非稳态浇铸条件下,铸坯表面和内部质量缺陷进行了分析。结果表明,铸坯振痕间距为13 mm,角部出现振痕紊乱;非稳态铸坯表面振痕波谷和凹坑处均发现了明显的横裂纹,而稳态样品则未见明显的表面横裂纹。铸坯内部沿着中心缩孔有长约55 mm中心裂纹,铸坯平均中心碳偏析指数达到1.09。根据该钢种的高温力学性能并结合裂纹形貌分析,非稳态下铸坯表面易冷却不均,造成局部温度在弯曲矫直时处于第Ⅲ脆性温度区;内部中心裂纹表面出现明显的液膜,在第Ⅰ脆性区凝固阶段产生。 相似文献
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The corrosion resistance of ultra-low carbon bainitic steel 总被引:1,自引:0,他引:1
The corrosion resistance of ultra-low carbon bainitic (ULCB) steel was compared with a weathering steel 09CuPCrNi through accelerated corrosion tests. The results indicated that the corrosion resistance was almost the same for ULCB and 09CuPCrNi based on the weight loss. It can be seen that the grain refinement did not deteriorate corrosion resistance property. The homogeneous microstructure, lower carbon content and random distributing ∑3 boundary could effectively increase the corrosion resistance of the ULCB steel. The characteristics of the rust layers indicated that the inner rust layer contained nanocrystalline Fe3−xO4 particles, while copper and chromium alloying additions were enriched at the rust layer and substrate interface in ULCB steel. These factors played important roles in forming a compact protective rust layer. 相似文献
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对超低碳贝氏体钢埋弧焊焊接接头焊缝区显微组织进行分析,发现焊缝区韧性与针状铁素体的含量存在一定的关系。对焊接接头组织进行扫描电子显微镜观察和能谱分析。结果表明,焊缝区针状铁素体以Al2O3夹杂物为核心多维形核呈放射状生长;利用EBSD对焊接接头组织进行晶体学取向研究,结果发现,焊缝针状铁素体晶粒取向并不完全随机分布,在某些晶体学方向上存在取向择优;各针状铁素体之间呈大角度晶界;从同一夹杂物上长出的针状铁素体,沿同一方向背向生长的针状铁素体具有相同的取向,可能因为它与奥氏体具有一定的晶体学取向关系。 相似文献
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《International Journal of Cast Metals Research》2013,26(1-4):256-259
AbstractIn this study, the carbon steel boll mould that has merit of the metal mould and the sand mould was produced. Steel balls were heated and joined to produce the steel ball mould. The compressive strength was measured for the strength of the mould. The compression specimen was manufactured after putting steel balls into the carbon vessel and heating to join. The compression specimen was 10 mm in diameter and about 10 mm in height. The influence of the diameter of the steel ball and temperature of heating on the strength of the steel ball mould was examined. The compressive strength decreased as the ball diameter became large. Steel balls were oxidised and joined by heating. Melted aluminium was cast into the carbon steel ball mould. The macrostructure of the solidified specimen was observed. 相似文献