Alloy Data Sheet – Tough 25 High Chrome White Iron

Posted by Penticton Foundry on March 10, 2016

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. To find out why high chrome white iron is so abrasion resistant read this.

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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)	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 70-1112F	7.2 (13)
Melting Temperature (F)	2300 F
Compressive Strength Ksi (MPa)	429 (2960)
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:

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.

Read: To learn about other ASTM A532 alloys, check out our chrome white iron webpage.