Metallurgical Conditions Required for Superior Hot-workability of 13% Chromium Steels in a Seamless Rolling Process
スポンサーリンク
概要
- 論文の詳細を見る
Hot-workability of 13% Cr steels was investigated in terms of microstructure by model elongator rolling tests and by tensile tests to develop modified types of 13% Cr steel seamless OCTGs (Oil Country Tubular Goods). Hot-workability deteriorated in both tests by the formation of δ-ferrite in austenite (γ) matrix; however, the deterioration occurred at lower temperatures in tensile tests than in model elongator tests. Materials are deformed more heavily in the latter than in the former, which is considered to be the cause of the difference. The result suggests that lower temperatures than the actual rolling temperature should be selected for the tensile tests in order to evaluate hot-workability of materials for seamless pipes. δ phase fraction during hot-working was almost equal to that estimated from the experimental phase diagram at a deformation temperature for plain C–13%Cr steels and at a primary heating temperature for Ni containing low C–13%Cr steels. This phenomenon is explained by a difference in the diffusion coefficient of C and that of Ni. Furthermore, it was clarified that isolated distribution and polygonal shape of δ prevented void-propagation during hot-working and was not harmful to hot-workability in plain C–13%Cr steels.
- 社団法人 日本鉄鋼協会の論文
- 2007-08-15
著者
-
ASAHI Hitoshi
Steel Research Laboratories, Nippon Steel Corporation
-
Asahi Hitoshi
Steel Res. Laboratories Nippon Steel Corp.
-
Ueno Masakatsu
Nippon Steel Corporation
-
KAWAKAMI Akira
Yawata R & D Laboratory, Nippon Steel Corporation
-
Kawakami Akira
Yawata R & D Laboratory Nippon Steel Corporation
関連論文
- Effects of Boron Addition on Tempering Processes in an Fe-9Cr-0.1C Alloy Martensite
- Effects of Boron Addition on Tempering Processes in an Fe-9Cr-0.1C Alloy Martensite
- Metallurgical Conditions Required for Superior Hot-workability of 13% Chromium Steels in a Seamless Rolling Process
- Abnormal αto γ Transformation Behavior of Steels with a Martensite and Bainite Microstructure at a Slow Reheating Rate
- Effects of Mo and B on hardenability after hot working
- Hydrogen Trapping Behavior in Vanadium-added Steel