Behavior of Phase Transformation of X70 V-Nb Microalloying Steel Tube for Deep-Sea Pipe-Line during Continuous Cooling

华文林; 杨秀芝; 杨春杰; 董春法

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Behavior of Phase Transformation of X70 V-Nb Microalloying Steel Tube for Deep-Sea Pipe-Line during Continuous Cooling

更新时间：2026-01-21

- Behavior of Phase Transformation of X70 V-Nb Microalloying Steel Tube for Deep-Sea Pipe-Line during Continuous Cooling
- Special Steel Vol. 38, Issue 1, Pages: 66-69(2017)
- 作者机构：
  
  湖北理工学院机电学院,黄石,435003
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：08 August 2016，
  
  Online First：29 July 2022，
  
  Published：29 July 2017
- 稿件说明：
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华文林, 杨秀芝, 杨春杰, et al. Behavior of Phase Transformation of X70 V-Nb Microalloying Steel Tube for Deep-Sea Pipe-Line during Continuous Cooling[J]. Special Steel, 2017, 38(1): 66-69.
DOI：

华文林, 杨秀芝, 杨春杰, et al. Behavior of Phase Transformation of X70 V-Nb Microalloying Steel Tube for Deep-Sea Pipe-Line during Continuous Cooling[J]. Special Steel, 2017, 38(1): 66-69. DOI：

摘要

利用Gleeble-3500热模拟试验机

测定了Φ406.4 mm×16.5 mm X70深海无缝管线钢管（/%:0.07C

0.70Si

0.80Mn

0.008P

0.002S

0.25Ni

0.25Cr

0.20Mo

0.10Cu

0.06V

0.03Nb

0.04Alt

0.0060N）的CCT曲线

并通过光学显微镜

扫描电子显微镜

HV硬度计分析了0.1~100℃/s的冷却速度下钢管的组织特征。结果表明

冷却速度为0.15℃/s时钢中组织主要为铁素体+珠光体

当冷却速度大于5℃/s时

钢中组织为贝氏体+铁素体;随冷却速度的提高

钢组织细化

硬度增加;当冷却速度为3050℃/s时

可以获得适量的板条贝氏体组织

从而可保证管线钢有良好的力学性能。

Abstract

The continuous cooling transformation (CCT) curves of Φ406.4 mm x 16.5 mm X70 seamless steel tube for deep-sea pipe-line (/% : 0. 07C

0. 70Si

0. 80Mn

0.008P

0. 002S

0. 25Ni

0. 25Cr

0. 20Mo

0. 10Cu

0. 06V

0. 03Nb

0. 04Alt

0.006 ON) have been measured by using Gleeble-3500 thermo-mechanical simulator

and the structure feature of the steel tube with cooling rate 0. 1 ~ 100 ℃/s is analyzed by optical microscope

scanning electron microscope and HV hardness meter. Results show that with cooling rate 0.15℃ /s the main structure in steel is ferrite + pearlite

as cooling rate more than 5 ℃/s the structure in steel is bainite + ferrite ； with increasing cooling rate the structure of steel is fined and the hardness of steel increases ； with cooling rate 30 〜50 °C /s the suitable amount of lath bainite structure is obtained therefore to insure getting excellent mechanical properties of pipe-line steel.

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