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Kohler Industrial Castings produces three grades of gray iron, three grades of ductile iron, and five grades of austempered ductile iron as standard. Special, nonstandard grades can also be produced at a customer's request.
Gray iron grades are generally specified by tensile strength and Brinell hardness. Ductile iron grades are specified by tensile strength, yield strength and percent elongation.
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ASTM |
Hardness Range* |
Min. Tensile Strength psi |
Min. Yield Strength 0.2% |
Elongation % in 2 Ln |
| GRAY IRON GRADES |
| SAE Grade G2500 J431 |
A159 |
170-229
BHN
4.6-4.0 BID |
25,000 |
N/A |
N/A |
| SAE Grade G3000 J431 |
A159 |
187-241
BHN
4.4-3.9 BID |
30,000 |
N/A |
N/A |
| SAE Grade 3500 J431 |
A159 |
207-255
BHN
4.2-3.8 BID |
35,000 |
N/A |
N/A |
| DUCTILE IRON GRADES |
SAE Grade D4512 J434c
(Ferritic-Pearlitic) |
A536 |
156-217
BHN
4.8-4.1 BID |
65,000 |
45,000 |
12 |
SAE Grade D5506 J434c
(Ferritic-Pearlitic) |
A536 |
187-255
BHN
4.4-3.8 BID |
80,000 |
55,000 |
6 |
SAE Grade D7003 J434c
(Ferritic-Pearlitic) |
A536 |
241-302
BHN
4.4-3.8 BID |
100,000 |
70,000 |
3 |
| AUSTEMPERED DUCTILE IRON GRADES |
| SAE Grade 1 |
A897 |
269-321
BHN
3.7-3.4 BID |
125,000 |
80,000 |
10 |
| SAE Grade 2 |
A897 |
302-363
BHN
3.5-3.2 BID |
150,000 |
100,000 |
7 |
| SAE Grade 3 |
A897 |
341-444
BHN
3.3-2.9 BID |
175,000 |
125,000 |
4 |
| SAE Grade 4 |
A897 |
388-477
BHN
3.1-2.8 BID |
200,000 |
155,000 |
1 |
| SAE Grade 5 |
A897 |
444-555
BHN
2.9-2.6 BID |
230,000 |
175,000 |
N/A |
*Brinell impression (BID) is the diameter in millimeters(mm) of the impression of a 10mm ball at 3000kg load.
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