we have obtained ISO 9001, ISO 14001, ISO 45001, CE, AAA-level credit rating certification, etc.
Scope:
1.1 This specification2 covers austenitic ductile iron, Type D-2M, Classes 1 and 2, for compressors, expanders, pumps, valves, and other pressure-containing parts intended primarily for low-temperature service.
1.2 These grades of austenitic ductile iron are characterized by having their graphite substantially in a spheroidal form and free of flake graphite. They are essentially free of carbides and contain sufficient alloy content to produce a stable austenitic matrix down to −423°F [−252°C] (liquid hydrogen).
Properties
|
Property |
Temperature |
Value |
Comment |
|
Density |
23.0 °C |
6.8 - 7.8 g/cm³
|
Typical for Cast Iron |
Mechanical
|
Property |
Temperature |
Value |
Comment |
|
Charpy impact energy |
23.0 °C |
20 J |
|
|
Elastic modulus |
23.0 °C |
152 GPa |
Typical for Cast Iron |
|
Elongation |
23.0 °C |
30 % |
|
|
Hardness, Brinell |
23.0 °C |
121 - 171 [-] |
|
|
Poisson's ratio |
23.0 °C |
0.27 [-] |
Typical for Cast Iron |
|
Shear modulus |
23.0 °C |
41 GPa |
Typical for Cast Iron |
|
Tensile strength |
23.0 °C |
450 MPa |
|
|
Yield strength Rp0.2 |
23.0 °C |
205 MPa |
|
Thermal
|
Property |
Temperature |
Value |
Comment |
|
Melting point |
|
1120 °C |
Typical for Cast Iron |
|
Specific heat capacity |
23.0 °C |
460 - 527 J/(kg·K) |
Typical for Cast Iron |
|
Thermal conductivity |
23.0 °C |
55 W/(m·K) |
Typical for Cast Iron |
Chemical properties
|
Property |
Value |
|
Carbon |
2.2 - 2.7 % |
|
Chromium |
0.2 % |
|
Manganese |
3.75 - 4.5 % |
|
Nickel |
21 - 24 % |
|
Phosphorus |
0.08 % |
|
Silicon |
1.5 - 2.5 % |
