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经过分析确定特厚钢板热处理后头尾分层的主要原因是缺陷部位存在夹杂物,中心偏析严重,热处理升降温过程中开裂形成分层,针对以上原因,采取了热处理前保留头尾,充分缓冷,剪切充分预热等措施,改善效果明显。 相似文献
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中厚钢板延伸率不合格原因分析 总被引:2,自引:0,他引:2
对Q235钢板延伸率不合格现象进行夹杂物和显微组织分析。结果表明,板材中出现的硫化物夹杂物较多、分布不均匀是造成板材力学性能不合格的主要原因。 相似文献
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中厚钢板表面缺陷形成原因分析 总被引:1,自引:0,他引:1
利用金相显微镜和扫描电能谱仪对武钢轧板厂近期生产的一批钢板的表面缺陷进行了分析,分析结果表明,这种表面缺陷是由复合保护渣物理性能不合格而引起的皮下气泡。 相似文献
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文章针对企业C19400合金铸锭在热轧生产过程中出现板带开裂问题,借助OM、SEM和EDS检测分析,对开裂原因进行了分析;通过控制铸坯杂质含量、改进铸造工艺、优化热轧道次加工率等措施,解决了C19400合金热轧板开裂的问题。 相似文献
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某钢厂生产厚度规格为60 mm的Q355B中厚板出现边部横裂.金相检验未在裂纹周围发现明显氧化质点和脱碳现象,但表层至板厚1/4部位出现了大量WF+B组织,且距表层约1~3 mm部位组织呈现沿轧制方向的流变形态.分析结果表明:轧制喷水过程钢板边部聚集大量残留水,导致产生异常组织和表面裂纹,可通过强化冷却过程层流水的管控加以改善. 相似文献
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Steven G. Jansto 《Metallurgical and Materials Transactions B》2014,45(2):438-444
The recently developed application of the MicroNiobium Alloy Approach® in medium- and high-carbon steel long products, sheets, and plate steels enhances both the metallurgical properties and processability, as well as reducing the operational cost per tonne of production. The process and product metallurgy improvements relate to the Nb-pinning effect of the austenite grain boundaries. The metallurgical mechanism of the MicroNiobium Alloy Approach is related to the retardation of austenite grain coarsening during reheat furnace soaking of the billets, slabs, or shapes before rolling. Variable grain size is induced by temperature fluctuations and inhomogeneity during the heating of the slabs in the reheat furnace. Such fluctuations can occur because of variations in the air- to gas-ratio, directly affecting the adiabatic flame temperature and heat input into the slabs. This approach contributes to the achievement of an ultrafine grain, homogeneous higher carbon microstructures that exhibit superior toughness, high strength, less mechanical property variation in the final hot-rolled product, and reduced cost of quality. The reduced cost of quality far exceeds the additional alloy cost for the Nb addition. 相似文献