Huaqiang

ASTM A571/A571M

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 %

 
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