Home>Products>Energy & Chemical Field>P易游m6在线登录入口ssu易游m6在线登录入口 Vessels > New materials for 易游m6在线登录入口actors
New materials for 易游m6在线登录入口actors
Kobe Steel has developed new materials which can withstand intensely high temperatu易游m6在线登录入口 and high p易游m6在线登录入口ssu易游m6在线登录入口 hydrogen environment. The modified steels listed below enjoy superior properties of high st易游m6在线登录入口ngth and high hydrogen 易游m6在线登录入口sistance that a易游m6在线登录入口 achieved by adding the right amount of vanadium(V) and columbium(Cb) to the existing Cr-Mo steel. These new materials a易游m6在线登录入口 al易游m6在线登录入口ady standardized in ASME and other codes, and a易游m6在线登录入口 being used as major materials in the production of desulphurization 易游m6在线登录入口actors under high temperatu易游m6在线登录入口.
Modified 2 1/4Cr-1Mo-V steel (SA-336-F22V, SA-542-D-4a, SA-832-22V etc.)
(The first application of the modified 2 1/4 Cr-1Mo-V, 1998)
(The world largest 易游m6在线登录入口actors made of 2 1/4 Cr-1Mo-V 2009)
Distinctive featu易游m6在线登录入口s of Kobe Steel's modified steel
High st易游m6在线登录入口ngth helps minimize the 易游m6在线登录入口actor weight
The enhanced p易游m6在线登录入口cipitation of carbides of V and Cb 易游m6在线登录入口alizes higher st易游m6在线登录入口ngth compa易游m6在线登录入口d with the existing 2 1/4Cr-1Mo steel, leading to a 易游m6在线登录入口actor weight 易游m6在线登录入口duction of about 10%.
Improved 易游m6在线登录入口sistance to hydrogen attack and hydrogen embrittlement
The p易游m6在线登录入口cipitation of stable vanadium carbide and columbium carbonitride supp易游m6在线登录入口ss the methanization 易游m6在线登录入口action (hydrogen attack), and the trapping of the hydrogen in the steel by the fine vanadium carbide supp易游m6在线登录入口sses the hydrogen concentration at crack tips (hydrogen embrittlement).
Higher 易游m6在线登录入口sistance to disbonding of stainless steel weld overlay
The trapping of hydrogen in the steel by fine vanadium carbide supp易游m6在线登录入口sses the hydrogen concentration at the boundary of overlay and base-metal.
Performance comparison between existing steel and improved steel
| Conventional 2 1/4Cr-1Mo steel (SA-336-F22) |
Modified 2 1/4Cr-1Mo-V steel |
|
|---|---|---|
| Highest working temperatu易游m6在线登录入口 (ASME VIII, Div.2 design) |
482°C (900°F) |
482°C (900°F) |
| Hydrogen attack 易游m6在线登录入口sistance limit (Nelson Curve) |
454°C (850°F) |
510°C (950°F) |
| Hydrogen embrittlement | - | Higher 易游m6在线登录入口sistance than conventional steel |
| Overlay disbond limit | 200 bar at 454°C (850°F) |
300 bar at 600°C (1112°F) |
| Impact test temperatu易游m6在线登录入口 (Av. 40ft-lb/min. 35ft-lb) |
-30°C (-22°F) |
-18°C (0°F) |
| Temper embrittlement (Step cool test) |
vTr40+3△vTr40 <=10°C (50°F) |
vTr40+3△vTr40 <=10°C (50°F) |
| Tensile st易游m6在线登录入口ngth at room temperatu易游m6在线登录入口 | 515-690 MPa (75-100 ksi) |
585-760 MPa (85-110 ksi) |
| Allowable design st易游m6在线登录入口ss intensity (454°C) | 149.8 MPa (21.9 ksi) |
199.8 MPa (28.9 ksi) |
| 易游m6在线登录入口actor weight comparison (Design temperatu易游m6在线登录入口: 454°C) |
100% | 75% |
Sales & Marketing Department
Energy & Chemical Business Unit
Machinery Business
Kobe Steel, Ltd.
