Overhead view of covered Scrap yard and material segregation outside of the cast iron foundry

Iron Specifications

Ductile and Gray Iron Castings

Gray, Ductile and Austempered Iron

Kohler Industrial Castings produces three (3) grades of gray iron, four (4) grades of ductile iron, and five (5) grades of austempered ductile iron. Special, nonstandard grades can also be produced at a customer's request.

 

Gray Iron

We specify gray iron by tensile strength and Brinell hardness. 

 

Grade 

ASTM 

Hardness Range 

Min Tensile Strength psi 

Class 25 

A48 

170-229 BHN  

25,000 

Class 30 

A48 

187-241 BHN  

30,000 

Class 35 

A48 

207-255 BHN  

35,000 

 

Ductile Iron

Ductile iron grades are specified by tensile strength, yield strength and percent elongation. 

Properties are evaluated using separately cast test bars. 

 

Inch-Pound Units (minimums)

Grade 

ASTM 

Tensile Strength (KSI) 

Yield Strength (KSI) 

Elongation (%) 

60-40-18 

A536-84 

60,000 

40,000 

18 

65-45-12 

A536-84 

65,000 

45,000 

12 

80-55-06 

A536-84 

80,000 

55,000 

6 

100-.70-03 

A836-84 

100,000 

70,000 

3 

 

Grade 60-40-18 may require additional heat treatment depending on casting design to meet required properties. 

 

Austempered Ductile Iron Grades

Kohler Industrial Castings produces castings with the Five Standard ADI grades per the ASTM A897/A897M-16  

 

Inch-Pound Units  

Grade                   

Tensile Strength (KSI) 

Yield Strength (KSI) 

Elongation (%) 

Typical Hardness (HBW) 

Grade 1 

130-.90-09 

130 

90 

9 

269-341 

Grade 2 

150-.110-07 

150 

110 

7 

302-375 

Grade 3 

175-125.-04 

175 

125 

4 

341-444 

Grade 4 

200-155.-02 

200 

155 

2 

388-477 

Grade 5 

230-185.-01 

230 

185 

1 

402-512