Wilfley’s MAXALLOY® 5A hard iron combines unsurpassed hardness with superior toughness to create the ideal material for high wear applications
MAXALLOY® 5A hard iron is Wilfley’s proprietary version of standard 27% Chrome (ASTM A532 Class III, Type A) that has been specially processed to achieve a much higher hardness (740 HBN). The proprietary processing also increases the pH range, which gives MAXALLOY® 5A a much lower corrosion rate as compared to commonly available high chrome irons.
Chemical Composition (Weight %)
| C | Mn | Si | P | S | Cr | Ni | Mo | Cu | Fe |
| Carbon | Manganese | Silicon | Phosphorus | Sulfur | Chromium | Nickel | Molybdenum | Copper | Iron |
| 2.0-3.3 | 2.0 max | 1.5 max | 0.1 max | 0.06 max | 23.0-30.0 | 2.5 max | 3.0 max | 1.2 max | Balance |
| Carbon (C) | 2.0-3.3 |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 1.5 max |
| Phosphorus (P) | 0.1 max |
| Sulfur (S) | 0.06 max |
| Chromium (Cr) | 23.0-30.0 |
| Nickel (Ni) | 2.5 max |
| Molybdenum (Mo) | 3.0 max |
| Copper (Cu) | 1.2 max |
| Iron (Fe) | Balance |
MAXALLOY® 5A vs. Standard 27% Chrome
Increased Service Life
(Based on test field data)
Increased Preferred pH Range
(Based on laboratory testing)
Chemical Composition (Weight %)
Standard hard iron impeller after 40 service days
MAXALLOY® 5A impeller after 97 service days
Photo 2 shows a new MAXALLOY® 5A impeller after 97 service days. The pump was reassembled and the impeller ran successfully for 135 service days, over 3 times longer than standard hard iron.
Case Wear in Garnet Mining Application
Standard hard iron case after 5 service days
MAXALLOY® 5A case after 21 service days
Photo 3 shows a standard hard iron case after only 5 service days. Deep wear trenches are clearly visible in the case walls because of the lower fracture toughness and hardness. Significant corrosion can also be seen on the exposed surfaces.
Photo 4 shows a new MAXALLOY® 5A case after 21 service days. The wear pattern shows plastic deformation instead of wear trenches, indicating high and uniform hardness distribution through the pump case wall. The MAXALLOY® 5A case also shows no sign of corrosion.
Wilfley Case Study
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