ASTM A532 Class 1 Type A VS. ASTM A532 Class II Type D
on August 10, 2016The following chart offers a comparison of two high chrome white irons – ASTM A532 Class I Type A, also called Ni-Hard 1 and ASTM A532 Class II Type D. 
Composition
ASTM A532 Class I Type A – also called Ni-Hard 1
|
|
C |
Mn |
Si |
Cr |
Mo |
Ni |
|
Min% |
2.8 |
|
|
1.4 |
|
3.3 |
|
Max% |
3.6 |
2.0 |
0.8 |
4.0 |
1.5 |
5.0 |
ASTM A532 Class II Type D
|
|
C |
Mn |
Si |
Cr |
Mo |
|
Min% |
2.8 |
|
|
18 |
|
|
Max% |
3.1 |
1.0 |
1.5 |
25 |
1.5 |
Physical and Mechanical Properties (reference Abrasion Resistant Handbook)
ASTM A532 Class I Type A – also called Ni-Hard 1
|
Density lb/in3 (g/cm3) |
0.27-0.28 (7.6-7.8) |
|
Thermal Conductivity Btu/hr·ft·F (W/m·K) |
8.6-17.3 (15-30) |
|
|
|
|
Coefficient of Thermal Expansion Ɛ/F(Ɛ/C)X106 average between 50-800F |
4.5-7.1 (8-1.8) |
|
Melting Temperature (F) |
2300 F |
|
Modulus of Elasticity (GPa) |
24-26(169-183) |
|
Transverse Strength Ksi( MPa) |
70-90 (500-620) |
|
Tensile Strength Ksi(MPa) sand cast |
40-50(280-350) |
ASTM A532 Class II Type D
|
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
ASTM A532 Class I Type A – also called Ni-Hard 1
|
|
Brinell (depends on thickness) |
|
Casting Hardness- depending on section thickness |
550-690 |
ASTM A532 Class II Type D
|
|
Brinell (depends on thickness) |
|
As-Cast |
450-550 |
|
Hardened |
>650 |
Applications
ASTM A532 Class I Type A – also called Ni-Hard 1
Mining crushing liners, chute liners and parts used in concrete and asphalt work. The higher chromium alloys have improved corrosion resistance compared to Ni-Hard 1.
ASTM A532 Class II Type D
Mining crushing liners, chute liners, crushing bars, and anvils, hammers and mining crusher parts. This alloy has a good corrosion resistance, although for a more extreme corrosion environment and abrasive wear mechanism, consider using an alloy with 28 to 30% Cr. This alloy can be machined and faced for fit purposes, but cannot be drilled and tapped.
