Effects of Tempering Process on Microstructure and Hardness of 110 ksi Grade Thick Wall Casing Steel Pipes

Wang Zheng; Wang Jian; Chen Li; Hu Li

doi:10.20057/j.1003-8620.N250586

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Effects of Tempering Process on Microstructure and Hardness of 110 ksi Grade Thick Wall Casing Steel Pipes

Forming and Phase Transition | 更新时间：2026-07-14

- Effects of Tempering Process on Microstructure and Hardness of 110 ksi Grade Thick Wall Casing Steel Pipes
- Special Steel Vol. 47, Issue 4, Pages: 109-114(2026)
- 作者机构：
  
  1.天津钢管制造有限公司，天津 300301
  2.中信泰富特钢集团有限公司销售总公司能源工程项目公司，江阴 214429
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N250586
  CLC： TG156
- Received：03 December 2025，
  
  Revised：2025-12-24，
  
  Accepted：31 December 2025，
  
  Published：30 July 2026
- 稿件说明：
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王正,王健,陈丽等.回火工艺对110 ksi钢级厚壁钢管组织和硬度的影响[J].特殊钢,2026,47(04):109-114.

Wang Zheng,Wang Jian,Chen Li,et al.Effects of Tempering Process on Microstructure and Hardness of 110 ksi Grade Thick Wall Casing Steel Pipes[J].Special Steel,2026,47(04):109-114.
王正,王健,陈丽等.回火工艺对110 ksi钢级厚壁钢管组织和硬度的影响[J].特殊钢,2026,47(04):109-114. DOI： 10.20057/j.1003-8620.N250586.

Wang Zheng,Wang Jian,Chen Li,et al.Effects of Tempering Process on Microstructure and Hardness of 110 ksi Grade Thick Wall Casing Steel Pipes[J].Special Steel,2026,47(04):109-114. DOI： 10.20057/j.1003-8620.N250586.

摘要

通过研究不同回火温度及保温时间对淬火后壁厚外侧为马氏体（M）组织、壁厚中间部位为马氏体+贝氏体（M+B）组织的厚壁抗硫套管钢显微组织和硬度的影响。结果表明，回火温度区间为695~720 ℃时，由于显微组织差异导致的洛氏硬度波动为0.8~1HRC。随回火保温时间延长，两种组织洛氏硬度均呈下降趋势，但在保温时间为75~85 min时，两种组织均出现明显二次硬化现象。对不同回火工艺试样显微组织观察发现，马氏体组织固溶碳含量较高，回火过程中碳原子脱溶析出导致硬度衰减相对较快，回火稳定性较差。但较高的固溶碳含量增加了碳化钒（VC）微合金析出相的百分比，由此产生的二次硬化现象补偿了碳脱溶导致的硬度衰减。因此，实际生产过程中应尽量获得均匀一致的显微组织，以减小钢管壁厚范围内硬度波动。同时，回火处理应避开二次硬化区间，使洛氏硬度满足抗硫管材机械性能要求。

Abstract

The effects of different tempering temperatures and holding times on the microstructure and hardness of thick wall sulfur-resistant casing steel， which exhibits martensite （M） structure at the outer wall and martensite + bainite （M+B） structure at the middle wall after quenching， were investigated. The results show that in the tempering temperature range of 695 ℃-720 ℃， Rockwell hardness fluctuation caused by microstructure differences is 0.8 - 1 HRC. Both types of microstructure show a decreasing trend in Rockwell hardness with the prolongation of tempering holding time. But when the tempering holding time is 75 min - 85 min， both groups have obvious secondary hardening phenomenon. Microstructure observation on samples subjected to different tempering process shows that， solid solution carbon content of martensite structure is high， and the precipitation of carbon atoms during tempering leads to relatively fast hardness attenuation and poor tempering stability. However， the higher solid solution carbon content increases the percentage of vanadium carbide （VC） microalloyed precipitates， and the secondary hardening phenomenon compensates for the hardness degradation caused by carbon dissolution. In actual production， the uniform microstructure should be obtained as far as possible to reduce the hardness vaiation in the wall thickness range of the pipe. At the same time， tempering treatment should avoid the secondary hardening interval， so that the hardness value can meet the requirements of mechanical properties of sulfur-resistant pipes.

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