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针对HRB335钢在轧制过程中出现开裂现象,运用金相显微镜、扫描电子显微镜(SEM)、X射线衍射分析(XRD)、氧氮分析仪以及能谱仪等手段,对钢材的组织结构、断口形貌、氧氮含量以及主要成分进行了分析,以便找到HRB335钢热轧开裂的原因。结果表明,HRB335钢材热轧开裂为脆性断裂,开裂主要原因是穿水工艺控制不好,而并非冶炼所致。开裂部位组织为典型魏氏体组织,导致钢材变脆。钢奥氏体化后,过热或保温时间过长,奥氏体晶粒长大,加之轧制过程中穿水冷却速度过快导致形成魏氏体组织。钢材开裂部氧含量远远高于同类钢材,钢材开裂部位夹杂物数量偏高,导致轧制性能降低,易出现轧制开裂。
Aiming at the cracking of HRB335 steel during the rolling process, the microstructures and fracture of HRB335 steel were studied by means of metallographic microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), oxygen and nitrogen analyzer and energy dispersive spectrometer Morphology, oxygen and nitrogen content and the main components were analyzed in order to find the HRB335 hot-rolled steel cracking causes. The results show that HRB335 steel hot-rolling cracking is brittle fracture, cracking is mainly due to poor control of water through the process, not due to smelting. Cracking parts of the organization for the typical Wenshan organization, leading to brittle steel. After austenitizing steel, overheating or holding time is too long, austenite grain growth, combined with the rolling process of water cooling too fast lead to the formation of Wei’s body tissue. Oxygen content of steel cracking department is much higher than similar steel, steel cracked part of the high number of inclusions, resulting in reduced rolling properties, prone to rolling cracking.