Reasonable Temperature Schedules for Cold or Hot Charging of Continuously Cast Steel Slabs

被引：13
|
作者：
Li, Yang [1 ,2 ]
Chen, Xin [3 ]
Liu, Ke [4 ]
Wang, Jing [1 ,2 ]
Wen, Jin [1 ,2 ]
Zhang, Jiaquan [1 ,2 ]
机构：
[1] Univ Sci & Technol Beijing, Dept Met Engn, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China
[3] Shanghai Baosteel Trading Co Ltd, Shanghai 200940, Peoples R China
[4] Shougang Res Inst Technol, Beijing 100043, Peoples R China
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2013年 / 44A卷 / 12期
关键词：
HYDROGEN EMBRITTLEMENT; TRANSVERSE CRACKING; ALLOY-STEEL; DUCTILITY; KINETICS; ELEMENTS; PRECIPITATION; NUCLEATION; MECHANISM; BEHAVIOR;
D O I：
10.1007/s11661-013-1842-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Some continuously cast steel slabs are sensitive to transverse fracture problems during transportation or handling away from their storage state, while some steel slabs are sensitive to surface transverse cracks during the following rolling process in a certain hot charging temperature range. It is revealed that the investigated steel slabs with high fracture tendency under room cooling condition always contain pearlite transformation delayed elements, which lead to the internal brittle bainitic structure formation, while some microalloyed steels exhibit high surface crack susceptibility to hot charging temperatures due to carbonitride precipitation. According to the calculated internal cooling rates and CCT diagrams, the slabs with high fracture tendency during cold charging should be slowly cooled after cutting to length from hot strand or charged to the reheating furnace directly above their bainite formation temperatures. Based on a thermodynamic calculation for carbonitride precipitation in austenite, the sensitive hot charging temperature range of related steels was revealed for the determination of reasonable temperature schedules. (C) The Minerals, Metals & Materials Society and ASM International 2013
引用
收藏
页码：5354 / 5364
页数：11
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