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ASTM A532 Class 1 Type A VS. ASTM A532 Class II Type D

Posted by admin on August 10, 2016

The 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. penticton-foundry-logo.jpg

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 sheet and faced for fit purposes, but cannot be drilled and tapped.

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