Ductile and Gray Iron Castings
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 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 (PSI) |
Yield Strength (PSI) |
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.
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 |