EN10028-4 X8Ni9 steel plate is mainly used to manufacture liquefied natural gas (LNG) storage tanks and transport ships. The service temperature can reach -196℃. It has high strength, excellent low temperature toughness, and good welding performance. It is a material with good toughness for use in cryogenic environments.
X8Ni9 steel composition(cast analysis, % by mass)
Grade |
C |
Si |
Mn |
P |
S |
Mo |
Ni |
V |
|
X8Ni9 |
≤0.10 |
≤0.35 |
0.30-0.80 |
≤0.020 |
≤0.005 |
≤0.10 |
8.5-10.0 |
≤0.05 |
Mechanical properties of X8Ni9 steel plate
Grade |
Delivery status |
Thickness mm |
Yield strength, MPa |
Tensile strength, MPa |
Elongation, A% |
|
X8Ni9+NT640 |
Two times normalizing and tempering |
≤30 |
≥490 |
640-840 |
≥18 |
|
30-50 |
≥480 |
||||
|
X8Ni9+QT640 |
Quenching and tempering |
≤30 |
≥490 |
||
|
30-50 |
≥480 |
||||
|
X8Ni9+QT680 |
Quenching and tempering |
≤30 |
≥585 |
680-820 |
≥18 |
|
|
|
Quenched and tempered steel X8Ni9 with specified elevated and/or low temperature properties is a low-temperature Ni-alloyed steel for pressure vessel construction, for refrigerators, gearbox parts and components in machine and apparatus engineering which are exposed temperatures up to -200 °C Further application for mounting elements at lower temperatures.
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