AMPCO® 21 Sand castings

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Description

The increase in the Al and Fe content results in a material in which the hard gamma 2 phase (about 400 HB) is present. By correct metallurgical control this hard constituent is uniformly distributed giving this alloy its ability to resist wear.

Ashby charts

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Properties

General

Density

ρ

7.2 g/cm³ at 23 °C

Mechanical

Charpy impact energy

aK,charpy

2.7 J at 23 °C

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Compressive strength

Rmc

1206 MPa at 23 °C

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Compressive yield strength, 0.1%

Rs,0.1

379 MPa at 23 °C

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Elastic modulus

E

103 GPa at 23 °C

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Elongation A5

A5

1.5 % at 23 °C

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Hardness, HBW

HBW

285 [-] at 23 °C

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HBW 10/3000

Hardness, Rockwell C

HRC

29 [-] at 23 °C

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Izod impact energy

aK,izod

2.7 J at 23 °C

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Reduction of area

Z

0.5 % at 23 °C

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Shear strength

τ

414 MPa at 23 °C

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Tensile strength

Rm

517 MPa at 23 °C

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Yield strength Rp0.5

Rp0.5

379 MPa at 23 °C

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Thermal

Coefficient of thermal expansion

α

1.62E-5 1/K at 23 °C

Specific heat capacity

cp

420 J/(kg·K) at 23 °C

Thermal conductivity

λ

42 W/(m·K) at 23 °C

Electrical

Electrical conductivity

σel

6.00E+6 S/m at 23 °C

Specific Electrical conductivity

10 % IACS

Chemical properties

Element

Weight %

Comment

Cu

-

Balance

Al

13.1 %

Fe

4.4 %

Other

2.5 %

Technological properties

Application areas

AMPCO® 21 is used for guide port bushings and wear strips replacing hardened steel and for some cams when no impact is involved. However, the largest single use is as die rings, inserts, forming rolls, etc. in forming, bending or drawing operations, especially when stainless steel is the material being processed. AMPCO® 21 is also widely used as work support blades for the centerless grinding of steel rods.

This material data has been provided by AMPCO METAL.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.