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- Title
Study on Influence by Microstructure Change of Seamless Steel Pipe on Its Hardenability.
- Authors
LI Dongyuan; WU Guanghui; ZHOU Zhengping; ZHOU Yong; SONG Shupeng; WU Run
- Abstract
The static CCT curve of the HG05 as-quenched-tempered seamless steel tube with high strength and toughness is measured by the Gleeble 3500 thermal simulation machine, and then the critical quenching-cooling rate of the steel is determined. The outer layer, the middle layer and the inner layer of the hot-formed HG05 seamless steel pipe are sampled and analyzed. All the said layers are of the bainite and ferrite structures, and the ferrite structure changes greatly. The size of ferrite in the middle layer is the largest, and the average size is 10 µm; and the inner ferrite volume fraction is the highest as about 12.4 vt%. The outer, the middle and the inner layers of the hot-formed steel tube are quenched with the thermal simulation method, and the critical quenching-cooling rate of the as-quenched-tempered steel, and the incompletely quenched microstructure is obtained. Since the quenched-tempered microstructure is homogeneous, there is little austenitic nucleation core, and after being heated with the thermal simulation, the austenite grain size is large, the critical quenching-cooling rate of austenite is 20 °C/s, whereas the critical quenching-cooling rate of the hot- formed microstructure is higher than that of the austenite.
- Subjects
HIGH strength steel; MICROSTRUCTURE; STEEL tubes; GRAIN size; BAINITE; STEEL pipe
- Publication
Steel Pipe, 2023, Vol 52, Issue 4, p16
- ISSN
1001-2311
- Publication type
Article
- DOI
10.19938/j.steelpipe.1001-2311.2023.4.16.20