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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