40Cr汽车钢板U型螺栓调质开裂原因分析

Crack Analysis of Quenching and Tempering of U Type Bolt for 40Cr Automotive Steel Plate

佟晶，金宏伟

东北特钢集团北满特钢有限责任公司

摘　要: 在汽车钢板U型螺栓生产过程中,调质后发现工件都有纵向开裂现象,造成产品报废。本文对报废产品取样进行了化学成份、金相高、低倍、硬度等项目的检测分析。分析发现螺栓用原材料工件为∮28mm正是处于最危险淬裂尺寸范围,其化学成份碳、锰、铬等元素均处于标准要求的上限,从而提高了其淬透性,在淬火冷却时,表面拉应力超过材料的断裂强度造成开裂。
关键词: U型螺栓；淬火；裂纹
分类号: TG142.15
栏　目: 实用技术
出　处: 《冶金与材料》2013年第6期，第 28-29 页（共 2 页）
出版日期: 2013-12-15
知网数据: 下载 114 次，被引 1 次（截至 2026-09-29）

Abstract: In the production process of U bolt for automotive steel plate,the workpiece has longitudinal cracking phenomenon after quenching and tempering,which causes the scrap products. The test analysis of chemical composition,micro and macro metallography,hardness and so on are done on the scrap products. It is detected that ∮ 28mm workpiece used for bolt is the most dangerous quenching crack size range. Analysis shows that the when raw materials used for bolt workpiece,including carbon,manganese,chromium and other elements are in the upper requirement limit,thus the hardenability improves,so that during cool quenching,surface fracture strength exceeds material tensile stress,and causes crack.
Keywords: U type bolt; Quenching; Crack

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