The Effect of Heat Treatment Process on the Hardenability of Gear Steel 20CrMnTiH Containing B

Li Haiyang; Guo Ziqiang; Qin Xuan; Yang Tianle; Jia Tao

doi:10.20057/j.1003-8620.N250529

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The Effect of Heat Treatment Process on the Hardenability of Gear Steel 20CrMnTiH Containing B

Forming and Phase Transition | 更新时间：2026-05-12

- The Effect of Heat Treatment Process on the Hardenability of Gear Steel 20CrMnTiH Containing B
- Special Steel Vol. 47, Issue 3, Pages: 124-129(2026)
- 作者机构：
  
  1.南京钢铁股份有限公司特钢事业部南京 210035
  2.东北大学数字钢铁全国重点实验室沈阳 110819
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N250529
  CLC： TG156
- Received：28 August 2025，
  
  Revised：2025-10-16，
  
  Accepted：22 October 2025，
  
  Published：30 May 2026
- 稿件说明：
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李海洋,郭子强,秦萱等.热处理工艺对含B 20CrMnTiH齿轮钢淬透性的影响[J].特殊钢,2026,47(03):124-129.

Li Haiyang,Guo Ziqiang,Qin Xuan,et al.The Effect of Heat Treatment Process on the Hardenability of Gear Steel 20CrMnTiH Containing B[J].Special Steel,2026,47(03):124-129.
李海洋,郭子强,秦萱等.热处理工艺对含B 20CrMnTiH齿轮钢淬透性的影响[J].特殊钢,2026,47(03):124-129. DOI： 10.20057/j.1003-8620.N250529.

Li Haiyang,Guo Ziqiang,Qin Xuan,et al.The Effect of Heat Treatment Process on the Hardenability of Gear Steel 20CrMnTiH Containing B[J].Special Steel,2026,47(03):124-129. DOI： 10.20057/j.1003-8620.N250529.

摘要

采用不同热处理工艺对

［B］为0.0018%和0.0051%的20CrMnTiH齿轮钢淬透性的影响进行了研究。理论计算Ti-Al-B-N体系中的固溶度积，确认实验所用热轧棒料中的硼均以有效形式存在。研究对比了热轧态、两种不同温度（600、650 ℃）的球化退火态以及正火态下的显微组织和端淬硬度曲线。结果表明，热处理工艺显著影响钢的淬透性，其性能优劣顺序为：正火态

热轧态

球化退火态（600 ℃）

球化退火态（650 ℃）。分析认为，该差异主要源于硼元素在渗碳体中的固溶行为。在较高温度球化退火时，更多的硼原子固溶于渗碳体中，而在后续奥氏体化过程中，这部分硼难以在短时间内充分回溶至奥氏体晶界以发挥其提高淬透性的作用，从而导致淬透性下降。本研究明确了渗碳体中固溶硼是影响含硼齿轮钢热处理后淬透性的关键因素，为优化热处理工艺以充分发挥硼钢性能优势提供了重要依据。

Abstract

This article systematically investigates the effects of different heat treatment processes on the hardenability of 20CrMnTiH gear steel with

［B］ content of 0.0018% and 0.0051%. By theoretically calculating the solubility product in the Ti-Al-B-N system， it was confirmed that boron in the hot-rolled bars used in the experiment exists in the effective form. The study compared the microstructure and end quenching hardness curves of hot-rolled state， spheroidized annealed state at two different temperatu

res （600 ℃ and 650 ℃）， and normalized state. The results indicate that the heat treatment process significantly affects the hardenability of steel， and the order of performance is： normalized state

hot-rolled state

spheroidized annealed state （600 ℃）

spheroidized annealed state （650 ℃）. It is analyzed that this difference is mainly due to the solid solution behavior of boron in cementite. During high temperature spheroidizing annealing process， more boron atoms dissolve into cementite， and in the subsequent austenitization process， this part of boron is difficult to fully dissolve back to the austenite grain boundaries in a short time to play its role in improving hardenability， resulting in a decrease in hardenability. This study clarifies that solid solution boron in cementite is a key factor affecting the hardenability of boron containing gear steel after heat treatment， providing important basis for optimizing the heat treatment process to fully utilize the performance advantages of boron steel.

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references

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