摘要
针对常规中碳与低锰成分系设计的碳素结构钢连铸坯常出现角裂的质量缺陷,严重影响产品热装率,在原有设备工况的条件下,开展成分优化设计,利用微合金化元素Ti置换部分C元素,通过细晶强化和析出强化替代固溶强化,保证产品的机械性能。同时,利用Ti微合金化的高温液析TiN第二相粒子固定钢液中游离的N原子,提高铸坯高温塑性,改善铸坯角裂。经批量化生产应用评价,采用新成分设计的碳素结构钢Q235B角裂率得到了有效控制。
The frequent quality defect of corner crack for casting blank of carbon structural steel with conventional composition design of medium carbon and low manganese seriously affects the hot charge rate of products.With the original equipment and working conditions,composition optimization design is carried out.The mechanical properties of products are ensured through replacing part of C with microalloying element Ti as well as replacing solution strengthening with fine-grain strengthening and precipitation strengthening.Meanwhile,the high temperature plasticity and corner crack of casting blank are improved through liquation of second phase particle for TiN with the high temperature of Ti microalloying to fix free nitrogen atom in liquid steel.The rate of corner crack for carbon structural steel Q235B with new composition design is controlled effectively through the evaluations of mass production and applications.
作者
康旭
宿成
刘妍
董磊
韩玉龙
李彬
Kang Xu;Su Cheng;Liu Yan;Dong Lei;Han Yu-long;Li Bin(Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;Manufacturing Dept.of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;Rare Earth Steel Plate Plant of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China)
出处
《包钢科技》
2023年第5期46-49,93,共5页
Science & Technology of Baotou Steel
关键词
碳素结构钢Q235B
TI微合金化
铸坯质量
力学性能
carbon structural steel Q235B
Ti microalloying
quality of casting blank
mechanical property
