Tough 25 ASTM A532 Class III Type A chrome white iron

Posted by Penticton Foundry

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25% Chrome Tough Alloy

This alloy maintains the abrasion resistance of the 25% chrome alloy with increased toughness.  This alloy is used for thicker section castings exposed to a high impact environment, such as in mining and crushing and in the Alberta Oil Sands.  Castings poured with this alloy can be machined, but not drilled or tapped.  Machining would be done for fit surfaces only.  The increased amount of Mo improves the hardenability of the alloy as well, which is a benefit to thicker section castings.  For further increased toughness use an ASTM A532 Class II Type B.

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Composition

 

C

Mn

Si

Cr

Mo

Min%

2.5

 

 

23

 

Max%

3.3

1.0

1.5

28

2.1

 

Physical and Mechanical Properties (reference Abrasion Resistant Handbook)

Density lb/in3 (g/cm3)

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0.26 (7.6)

Thermal Conductivity  
Btu/hr·ft·F (W/m·K)

8.6-17.3 (15-30)

Specific Heat at 70F  Btu/lb·F (J/Kg·k)

0.119

Coefficient of Thermal Expansion Ɛ/F(Ɛ/C)X106 average between 70-F

7.2 (13)

Melting Temperature (F)

F

Compressive Strength Ksi (MPa)

429 ()

Transverse Strength Ksi( MPa)

136 (938)

Typical Hardness

 

Brinell (depends on thickness)

As-Cast

450-550

Hardened

600-700

Applications
This alloy meets the requirements for many applications such as:

• Mining crusher liners
• Chute liners
• Dredge pumping
• Impellers
• Oil Sands applications
• Mining crusher parts

Corrosion Resistance
This alloy has good corrosion resistance.  For a more extreme corrosion environment and abrasive wear mechanism consider using an alloy with 28-30% Cr.

Processing

• This alloy is supplied in the hardened condition.
• It can be machined and faced for fit purposes, but it can&#;t be drilled and tapped.
• Inserts can be cast in if drilling and tapping is necessary.

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