Formation Mechanism-Removability of Primary Scales of Carbon Steel Hot-Rolled Heavy-Medium Plate and Process Improvement

Special Steel ›› 2017, Vol. 38 ›› Issue (2): 33-36.

Special Issue: 钢板

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Formation Mechanism-Removability of Primary Scales of Carbon Steel Hot-Rolled Heavy-Medium Plate and Process Improvement

Huang Hua¹ , Xu Lijun¹ , Shi Pengzhao²

1. National Engineering Research Centre for Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081 ；
2. School of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000);

Received:2016-10-26 Online:2017-04-01 Published:2022-07-23

碳钢热轧中厚板一次氧化铁皮形成机制-剥离性能和工艺改善

黄华¹，徐李军¹，时朋召²

1. 钢铁研究总院连铸技术国家工程研究中心，北京 100081 ；
2. 江西理工大学冶金与化学工程学院，赣州 341000；

作者简介:黄华(1985-),男，硕士(2012年燕山大学)，工程师,2009年山东科技大学(本科)毕业，连铸坯质量和缺陷控制研究。

Abstract

Abstract: The depressed defects of scales with dimension (10~40) mm x (3~10) mm and depth 1~3 mm occur at 30 mm plate hot-rolled from 230 mm casting slab of steel Q235B (/% : 0.18C, 0.20Si, 0.34Mn, 0.015P, 0.005S, 0.07Cr). The primary scale formation mechanism and removability at high temperature in high-pressure water descaling operation are analyzed and the measures to optimize the process are forward including (1) with optimizing heating process to insure the casting slab surface temperature being more than 1170 °C for high-pressure water descaling； (2) with optimized high-pressure water parameters i. e. increasing spray-water pressure from 18 MPa to 20 MPa and flow velocity from 161.2 m/s to 170.0 m/s, in order to increasing the impact force from 116.3 N to 122.7 N. The test and commercial production results by 26 heats show that after process optimization the closing off rate of slab caused by rolled-in scales reduces to less than 2% , it is obvious to improve the rolled-in scales defects.

Key words: Steel Q235B, Heavy and Medium Plate, Primary Scales, High-Pressure Water Descaling, Removability

摘要： Q235B钢（/%:0.18C,0.20Si,0.34Mn,0.015P,0.005S,0.07Cr）230 mm铸坯轧成的30 mm板上出现（10~40）mm ×（3~10）mm深1~3 mm氧化皮压入缺陷。分析了一次氧化铁皮缺陷形成机制与高压水除鳞作业中高温剥离性,并提出工艺优化措施:（1）通过优化加热工艺,使高压水除鳞时铸坯表面温度应保证在1170℃以上;（2）优化后高压水系统喷水压力由18 MPa提高至20 MPa,流速由161.2 m/s提高至170.0 m/s,使打击力由116.3 N提高至122.7 N。26炉次的试验及生产实践结果表明,工艺优化后氧化铁皮压入导致的封锁率控制在2%以下,显著改善了氧化铁皮压入缺陷。

关键词: Q235B钢, 中厚板, 一次氧化铁皮, 高压水除鳞, 剥离性

Huang Hua , Xu Lijun , Shi Pengzhao. Formation Mechanism-Removability of Primary Scales of Carbon Steel Hot-Rolled Heavy-Medium Plate and Process Improvement[J]. Special Steel, 2017, 38(2): 33-36.

黄华, 徐李军, 时朋召. 碳钢热轧中厚板一次氧化铁皮形成机制-剥离性能和工艺改善[J]. 特殊钢, 2017, 38(2): 33-36.

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Formation Mechanism-Removability of Primary Scales of Carbon Steel Hot-Rolled Heavy-Medium Plate and Process Improvement

碳钢热轧中厚板一次氧化铁皮形成机制-剥离性能和工艺改善

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