Simulated HAZ Continuous Cooling Transformation of X90 Pipeline Steel

Abstract:

In this paper, the simulation heat affected zone (HAZ) continuous cooling transformation (SHCCT) curve of X90 pipeline steel was drew by using Gleeble 3500 simulator. The results show that the trend of hardening of the weld HAZ of X90 pipeline steel was moderate, and softening tendency was not significant. When cooling rate was between 1°C/s and 10°C/s, the microstructure of X90 pipeline steel weld HAZ were composed of granular bainite and lath bainite. The recommended welding heat input of X90 pipeline steel was between 21kJ/cm and 66.4kJ/cm, and the weld preheating temperature was controlled about 100°C. In conclusion, optimization control measures on the microstructure and properties of X90 pipeline steel weld HAZ are presented by above comprehensive analysis.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 905-909
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.905
• Online since: March 2016
• Authors: Yu Liu, Ai Qing Ma, Bin Feng
• Keywords: Hardness, Microstructure, SHCCT, T_8/5, X90 Pipeline Steel

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