Effect of Initial Rolling Temperature on the Microstructure Evolution of Liquified Nature Gas Low-Temperature-Resistant Steel Bars
Zhenghong Ma, Jun Cao, Zhibo Zhang, Huanhuan Zhang, Shubiao Yin, Bingguo Liu, Xiaosong Zhang
TL;DR
This paper studies how rolling temperature and cooling speed affect the microstructure and hardness of steel bars used in LNG storage tanks.
Contribution
The study identifies optimal initial rolling temperatures and cooling rates to improve the microstructure and properties of low-temperature-resistant steel bars.
Findings
A cooling rate of 1–2 °C/s results in polygonal ferrite and pearlite microstructures.
Higher cooling rates (10–25 °C/s) lead to bainite as the dominant microstructure.
An initial rolling temperature of 1050 °C is more effective than 1000 °C for producing better material properties.
Abstract
In order to gain insight into the changes of the organization and hardness of 500 MPa steel-grade low-temperature-resistant steel bars (HRB500DW) for liquefied nature gas (LNG) storage tanks during the continuous cooling phase transformation process, the effects of different rolling temperatures and cooling speeds on the organization of the phase change law, microstructure and hardness were studied. The results show that the critical phase transformation points AC1 and AC3 of the test steel were 702 and 880 °C, respectively. The organization of the test steel was polygonal ferrite and pearlite when the cooling rate was 1–2 °C/s. At a cooling speed of 5 °C/s, a small amount of bainite started to be produced in the region of a large deformation of rolling, and at 15 °C/s, some slate martensite started to be produced. At a cooling speed of 10 to 25 °C/s, the organization was mainly…
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Taxonomy
TopicsMicrostructure and Mechanical Properties of Steels · Metal Alloys Wear and Properties · Magnetic Properties and Applications