Data Sheet ASTM A532 Class II Type B Chrome White Iron


ASTM A532 Class II Type B High Chromium Alloy
The 15%Cr alloy is typically poured on request at Penticton Foundry.  With the lower Cr and an addition of Molybdenum, this alloy is used in operating environments where abrasion and impact are the wear mechanisms.  With specific heat treatments it is possible to achieve a high hardness for abrasion resistance, and with a lower carbide ratio the toughness is improved for impact.  A Mo addition improves the hardenability.  With the lower Cr this material has lower corrosion resistance properties.

Composition


C

Mn

Si

Cr

Min%

2.7



14

Max%

3.3

1.3

1.0

17

 

Physical and Mechanical Properties (reference Abrasion Resistant Handbook)

Density lb/in(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

600-650

 

Applications
This alloy meets the requirements for many applications like mining crusher liners, feed-chute liners, apron-feed liners, semi-autogenous ball mill liners, lifter bars, sizing grates, verti-mill liners and slurry pumps.

This alloy is also used in roller crusher applications.  The roller crushers are used to grind coal, limestone, cement, phosphate rock and other soft to medium hard minerals.

Balls in cement clinker mills are another example of where this alloy may be used.