
第37卷第1期 2016年2月
·失效分析·
热处理技术与装备
RECHULI JISHU YU ZHUANGBEI
Vol.37,No. 1 Feb,2016
浅析HPB235钢中磷偏析形成开裂分层的原因
高振行,张旭昌?
(1.徐州华宏特钢有限公司理化检测中心,江苏徐州221499; 2.山西安泰集团股份有限公司技术中心金相室,山西介休032002)
摘要:某集团公司第一轧钢厂在热轧HPB235钢线材时,钢坏轧至Φ46mm时出现贯穿直径且顺轧制方向(纵向)开裂分层缺陷,用宏观和显微分析分析了缺陷的成因。结果表明:在连铸钢坏中产生严重的磷偏析,在钢坏中心区域生成了较宽的铁素体带,在铁素体带上又分布着多条长条状硫化物,正是由于严重的磷元素偏析,出现“鬼线”组织,导致钢坏在热轧到一定尺寸时,在热轧压力下,发生穿直径并沿轧制方向的纵向开裂分层。
关键词:HPB235钢;磷偏析;硫化物;鬼线组织;纵向开裂分层
中图分类号:TG250.6文献标志码:A文章编号:1673-49712016)01-0036-03
ABrief Analysis ofReasonforLayeredCrackingFormedby
PhosphorSegregationinHPB235Steel
GAO Zhen-xing',ZHANG Xu-chang
(1. The Testing Center of Physical & Chemical Examination, Huahong Special Steel Limited Co. , Xuzhou Jiangsu 221499, China; 2. Technology Center Metallurgical Chamber, Shanxi Antai Group Co. ,Lid. ,Jielin Shanxi 032002,China) Abstract: The layered cracking appeared along the rolling direction( longitudinal) and ran through the di-ameter when the HPB235 steel blank was hot rolled to @46 mm wire rod in first metal rolling factory of one steel making group, and the forming reason of the defect is analyzed by the macro and microstructure anal-ysis. The result shows that the forming reason of the defect is the serious phosphor segregation in the con-tinuous casted steel blank and a wider ferrite band in the central area of steel blank on which distribute multi-piece stripes sulfide impurity. Serious phosphor segregation causes ghost lines structure to lead lay-ered cracking along the rolling direction and throughout diameter when the steel blank is hot rolled to cer-tain diameter under hot rolling pressure.
Key words: HPB235 steel; phosphor segregation; sulfide impurity; ghost lines structure; longitudinal lay-ered cracking
某集团钢铁公司第一轧钢厂生产HPB235牌号钢线材时,连铸钢坏在热轧过程中,当轧到$46mm 时(按要求应轧制到Φ10mm线材)即出现贯穿直径的、沿轧制方向的纵向严重开裂分层,圆钢坏开裂的
收稿日期:2015-08-23
宏观形貌如图1所示。为查明钢坏在热轧过程中所产生严重开裂分层的主要原因,在开裂处的前沿,分别取纵截面和横截面试样,对其进行了宏观分析、和金相分析(1-2]。
作者简介:高振行(1952.12-),男,高级工程师,主要从事金属材料金相分析与力学性能试验。
联系电话:18796309046;E-mail;13643181717@163.com
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