Ductile Irons |
ASTM Standard |
Nominal Hardness |
|
Ductile Iron |
| A536 Grade 60-40-18 |
150 - 180 BHN |
Grade with maximum ductility and low temperature toughness. Excellent machinability. |
| A536 Grade 65-45-12 |
180 - 210 BHN |
|
| A536 Grade 80-55-06 |
210 - 250 BHN |
High strength, good wear resistance, moderate ductility and impact resistance. Good machinability. |
| A536 Grade 100-70-03 |
250 - 300 BHN |
|
| A536 Grade 120-90-02 |
300 - 360 BHN |
Very high strength and wear resistance. Fair machinability. |
Ductile Ni-Resist (Austenitic) |
| A439 Type D-2 |
139 - 202 BHN |
Used when resistance to heat, corrosion, oxidation and wear are required. Good strength and dimensional stability at elevated temperatures. |
| Other grades available upon request. |
Austempered Ductile Iron (ADI) |
| Grade 125/80/10 |
269 - 321 BHN |
Great strength, excellent dynamic properties. |
| Grade 150/100/7 |
302 - 363 BHN |
All ADI grades are stronger per unit of weight than Aluminum, as wear resistant |
| Grade 175/125/4 |
341 - 444 BHN |
As strong as steel, and easier to machine than free-machining steel. |
| Grade 200/155/1 |
388 - 477 BHN |
|
| Grade 230/185/0 |
444 - 555 BHN |
Even higher strength, excellent wear resistance. |
Gray Irons |
ASTM Standard |
Nominal Hardness |
|
Gray Iron |
| A48 Class 20 |
110 - 140 BHN |
Excellent machinability and damping capacity. Good resistance to thermal shock. |
| A48 Class 30 |
150 - 180 BHN |
|
| A48 Class 40 |
220 - 250 BHN |
Wear resistance increases, strength increases, finer finish after machining.
|
Heat Resistant Gray Iron |
| |
Element(s) Added |
|
| A319 Class I Type A |
Chromium |
Low tensile strengths, very good resistance to thermal shock. |
| A319 Class II Type A |
Chromium |
Moderate tensile strengths, average resistance to thermal shock. |
| A319 Class III Type B/C |
Chromium |
High tensile strengths, average resistance to thermal shock. |
| A319 II-B Plus Mo |
Cr & Moly |
Creep rupture properties greatly improved (at elevated temperatures). |
| A319 II-B Plus Cu |
Cr & Copper |
Most effective in retarding growth. |
| Other grades available upon request. |
Abrasion Resistant & High Chrome Irons
|
| Engineered to guarantee through hardness in sections up to 12 inches thick. |
Nihard |
| A532 Class I Type A |
550 BHN |
Microstructure is largely tempered Martensite, with less than 25% carbides by volume. Least abrasion resistant grade of alloyed white iron. |
20 - 1 |
| A532 Class II Type D |
>650 BHN (>820 LD) |
Microstructure is 30% by volume Carbides; remainder is Martensite. |
Pliant25 |
| A532 Class III Type A |
<300 BHN (Softened) |
Microstructure is 25% by volume Carbides. Used when drilling and tapping the casting is neccessary. |
| |
>600 BHN (Hardened) |
Casting can be supplied in softened condition and hardened after machining. |
Granite25 |
| A 532 Class III Type A |
>650 BHN (>820 LD) |
Microstructure is 35% by volume Carbides; remainder is Martensite. Most common 25% Cr alloy. |
Diamond25 |
| A 532 Class III Type A |
>650 BHN (>820 LD) |
Microstructure is 40% by volume Carbides; remainder is Martensite. The hardest, most abrasion resistant white iron on the market. |
| Other grades available upon request. |
