Feature of Slab Solidification and Its Effect on Ultrasonic  Inspection Defect of Medium Plate of Q355 Series  and HSLA Steel and Process Improvement

颜慧成; 范佳; 张凯; 冯俊鹏; 巩彦坤

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Feature of Slab Solidification and Its Effect on Ultrasonic Inspection Defect of Medium Plate of Q355 Series and HSLA Steel and Process Improvement

更新时间：2026-01-21

- Feature of Slab Solidification and Its Effect on Ultrasonic Inspection Defect of Medium Plate of Q355 Series and HSLA Steel and Process Improvement
- Special Steel Vol. 42, Issue 6, Pages: 58-60(2021)
- 作者机构：
  
  1. 河北钢铁集团邯钢公司1技术中心
  2. 第三炼钢厂,邯郸,056015
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：06 April 2021，
  
  Online First：03 January 2022，
  
  Published：03 January 2021
- 稿件说明：
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颜慧成, 范佳, 张凯, et al. Feature of Slab Solidification and Its Effect on Ultrasonic Inspection Defect of Medium Plate of Q355 Series and HSLA Steel and Process Improvement[J]. Special Steel, 2021, 42(6): 58-60.
DOI：

颜慧成, 范佳, 张凯, et al. Feature of Slab Solidification and Its Effect on Ultrasonic Inspection Defect of Medium Plate of Q355 Series and HSLA Steel and Process Improvement[J]. Special Steel, 2021, 42(6): 58-60. DOI：

摘要

通过对Q355系钢中板探伤缺陷进行取样分析，结合板坯连铸凝固传热计算，揭示了板坯凝固末端呈现双锥形液芯的凝固特性，双液芯区域由于C、Mn与H富集，成为中板两侧探伤缺陷的根源。通过工艺改进并严格控制，RH真空脱气时间≥20 min，连铸全程保护，结晶器钢液H含量≤2×10

-6

连铸过热度≤30 ℃，板坯中心碳偏析优于1.0级；结合执行板坯、中板缓冷处理，中板探伤正品率达到99.6%。

Abstract

With sampling analysis on defects of Q355 series steel medium plate defect by ultrasonic inspection and heat-transferring simulation for slab solidification process

it is disclosed that the biconical liquid core appearing at slab solidifying front and C/Mn/H gathering in this zone are the cause of the medium plate two side ultrasonic inspection defect. Through process improvement and strict control

the RH vacuum degassing time ≥20 min

the whole process of continuous casting protecting

and hydrogen content of steel in mold ≤2 x 10

-6

and superheat of continuous casting less than 30 °C

the center carbon segregation of slab is better than 1.0 rating

combining slow cooling of slab and medium plate

the qualification rate of medium plate inspection is 99. 6% .

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