Research and application of on Line Direct-Quenching (DQ) Process for 500 MPa S500QL High Strength Quenching and Tempering Steel Plate

赵国昌; 张海军; 刘生; 石莉; 林明新; 张萌; 程含文

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Research and application of on Line Direct-Quenching (DQ) Process for 500 MPa S500QL High Strength Quenching and Tempering Steel Plate

更新时间：2026-01-21

- Research and application of on Line Direct-Quenching (DQ) Process for 500 MPa S500QL High Strength Quenching and Tempering Steel Plate
- Special Steel Vol. 42, Issue 3, Pages: 57-62(2021)
- 作者机构：
  
  河钢集团舞钢公司科技部
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：29 November 2020，
  
  Online First：11 November 2022，
  
  Published：11 November 2021
- 稿件说明：
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赵国昌, 张海军, 刘生, et al. Research and application of on Line Direct-Quenching (DQ) Process for 500 MPa S500QL High Strength Quenching and Tempering Steel Plate[J]. Special Steel, 2021, 42(3): 57-62.
DOI：

赵国昌, 张海军, 刘生, et al. Research and application of on Line Direct-Quenching (DQ) Process for 500 MPa S500QL High Strength Quenching and Tempering Steel Plate[J]. Special Steel, 2021, 42(3): 57-62. DOI：

摘要

开发了低碳（C≤0.12%）Nb-V微合金化S500QL高强度钢板

使用120 t BOF+LF+VD的洁净钢冶炼工艺

采用两阶段控制轧制（第一阶段9501070℃区间轧制

第二阶段开轧≤890 ℃、终轧≤850℃）及轧后以720℃/s的冷速在线直接淬火（DQ）

经620670℃

3min/（mm·T）回火生产了 1550 mm钢板。钢板组织为细化的粒状贝氏体+少量先共析铁素体

屈强比≤0.90、延伸率A≥19%

-50℃下冲击功≥100 J

满足市场需求。对DQ工艺钢板进行焊接裂纹敏感性试验及焊接接头性能检验

结果显示

采用该工艺生产的钢板具有良好的焊接性能。

Abstract

Low carbon (C≤0. 12%) Nb-V microalloying S500QL high strength steel plate has been developed. And 15 ~50 mm steel plate is produced by two-stage controlled rolling (first stage rolling at 950 ~ 1 070 ℃

second stage started rolling at ≤890℃ and finishing rolling at ≤850 ℃

on-line cooling direct-quenching( DQ) with 7 ~20 ℃/s after rolling

and tempering at 620 - 670 ℃ for 3 min/ (mm • T)

clean steel smelting process with 120 t BOF + LF + VD. The steel plate has fine granular bainite + small amount of proeutectoid ferrite with yield-tensile strength ratio ≤0. 90

elongation A≥19% and impact energy at -50℃ ≥100 J to meet the market demand. And the welding crack sensitivity test and the welding joint property test of DQ process steel plate was carried out. The results show that the steel plate produced by this process has good welding property.

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