Effect of Cr on Phase Transformation and Structure of 0.035C-0.12Nb X80 Pipeline Steel

牛延龙; 孙新军; 刘清友; 孙力军

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Effect of Cr on Phase Transformation and Structure of 0.035C-0.12Nb X80 Pipeline Steel

更新时间：2026-01-21

- Effect of Cr on Phase Transformation and Structure of 0.035C-0.12Nb X80 Pipeline Steel
- Special Steel Vol. 30, Issue 5, Pages: 63-64(2009)
- 作者机构：
  
  1. 昆明理工大学材料与冶金工程学院,昆明,650093
  2. 钢铁研究总院结构材料研究所,北京,100081
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：09 March 2009，
  
  Online First：18 November 2022，
  
  Published：18 November 2009
- 稿件说明：
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牛延龙, 孙新军, 刘清友, et al. Effect of Cr on Phase Transformation and Structure of 0.035C-0.12Nb X80 Pipeline Steel[J]. Special Steel, 2009, 30(5): 63-64.
DOI：

牛延龙, 孙新军, 刘清友, et al. Effect of Cr on Phase Transformation and Structure of 0.035C-0.12Nb X80 Pipeline Steel[J]. Special Steel, 2009, 30(5): 63-64. DOI：

摘要

通过Formastor-FⅡ热膨胀仪测定了50 kg真空感应炉冶炼的X80管线钢(%:0.034～0.036C、1.79～1.80Mn、0.26～0.62Cr、0.12Nb、0.01Ti、0.0037～0.0038N)铸坯在0.5～50℃/s冷却速率下奥氏体连续冷却的相变点

并观察其显微组织。结果表明

在同一冷却速率下

随钢中Cr含量增加

过冷奥氏体连续冷却贝氏体相变点降低

组织中更易生成板条状贝氏体

显微硬度明显提高。

Abstract

Transformation point of continuous cooling austenite at cooling rate 0.5～50 ℃/s in cast billet of X80 pipeline steel (%:0.034~0.036C，1.79~1.80Mn，0.26~0.62Cr，0.12Nb，0.01Ti，0.0037~0.0038N) melted by 50 kg vacuum induction furnace was determined by Formaster-F Ⅱ dilatometer

and structure of steel was observed. Results showed that at same cooling rate

with increasing Cr content in steel the overcooling austenite continuous cooling trans- formation point to bainite decreased

the lath bainite easily formed in structure

and the microhardness obviously increased.

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