Q235B热轧板表面纵裂成因分析及工艺控制

特殊钢 ›› 2016, Vol. 37 ›› Issue (1): 29-33.

Q235B热轧板表面纵裂成因分析及工艺控制

张瑜, 漆鑫, 杨春, 张红斌

1武钢集团昆明钢铁股份有限公司技术中心，昆明650302；
2昆明理工大学，昆明650093

收稿日期:2015-08-05 出版日期:2016-02-01 发布日期:2022-08-24
作者简介:张瑜(1965-),男，高级工程师，1987年昆明工学院(本科)毕业，板材产品开发和工艺技术控制。

Analysis on Forming Cause of Surface Longitudinal Crack of Steel Q235B Hot-Rolled Plate and Controlling Process

Zhang Yu¹, Qi Xin², Yang Chunlei¹, Zhang Hongbin¹

1 Technology Center, Kunming Iron and Steel Co Ltd, Wuhan Iron and Steel Group, Kunming 650302；<br />
2 Kunming University of Science and Technology, Kunming 650093

Received:2015-08-05 Published:2016-02-01 Online:2022-08-24

摘要/Abstract

摘要： Q235B钢(0. 11% ~0. 17%C)10~20 mm热轧板的生产流程为铁水预处理-50 t转炉-吹氧-(2。0 ~ 230)mm x(900 ~ 1 600)mm板坯连铸-热轧工艺。分析表明.Q235B钢热轧板表面裂纹来源于铸坯纵裂。统计分析了成分、钢水过热度、拉速、连铸二冷水量、保护渣等对连铸坯纵裂的影响。通过控制Mn/S≥40,钢水过热度 15-35 °C,拉速1. 15 m/min,按季节调节二冷水量，釆用熔点≥1 100 °C，粘度0.20 ~0. 32 Pa .s,碱度≥1. 10的保护渣等措施，使Q235B钢热轧板表面纵裂纹由3.51%降至W0. 96%。

关键词: Q235B钢, 热轧板, 表面纵裂, Mn/S, , 200 mm板坯, 过热度, 拉速, 保护渣

Abstract: The flowsheet for 10 ~20 mm hot-rolled plate of Q235B steel (0. 11% ~0. 17% C) is hot metal pretreatment-50 t converter-argon blowing-(200 ~230)mm x (900 ~ 1 600) mm slab casting-hot rolling process. The analysis results show that the surface crack of hot-rolled plate stems from casting slab longitudinal cracks of steel Q235B. The effect of composition, liquid overheat extent, casting speed, casting secondary water rate and mold powder on longitudinal crack of casting slab has been statistically analyzed. With the measures including controlling Mn/S ≥40, liquid overheat extent 15 ~35 °C , casting speed 1. 15 m/min, adjusting secondary water rate according to season and using mold powder with melting point ≥1 100°C , viscosity 0. 20 ~ 0. 32 Pa .s and basicity ≥1. 10, the ratio of occurrence of steel Q235B hot- rolled plate surface longitudinal crack decreases to ≤0. 96% from original 3. 51% .

张瑜, 漆鑫, 杨春雷, 张红斌. Q235B热轧板表面纵裂成因分析及工艺控制[J]. 特殊钢, 2016, 37(1): 29-33.

Zhang Yu, Qi Xin, Yang Chunlei, Zhang Hongbin. Analysis on Forming Cause of Surface Longitudinal Crack of Steel Q235B Hot-Rolled Plate and Controlling Process[J]. Special Steel, 2016, 37(1): 29-33.

205

HTML			PDF

最新录用	在线预览	正式出版	最新录用	在线预览	正式出版
0	0	0	0	0	205

来源	本网站	其他网站

次数	95	110
比例	46%	54%

摘要

126

最新录用	在线预览	正式出版

0	0	126

	来源	本网站

	次数	126
	比例	100%