MAXALLOY® 5A HARD IRON
MAXALLOY 5A 27% Chrome Hard Iron
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.
![wilfley-centrifugal-pumps-maxalloy-5a-hard-iron-photo](http://wilfley.in/wp-content/uploads/2020/10/wilfley-centrifugal-pumps-maxalloy-5a-hard-iron-photo.jpg)
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 |
MAXALLOY® 5A vs. Standard 27% Chrome
Increased Service Life
(Based on test field data)
![wilfley-centrifugal-pumps-maxalloy-5a-hard-iron-service-life-h](http://wilfley.in/wp-content/uploads/2020/11/wilfley-centrifugal-pumps-maxalloy-5a-hard-iron-service-life-h.png)
Increased Preferred pH Range
![wilfley-centrifugal-pumps-maxalloy-5a-hard-iron-ph-range-h](http://wilfley.in/wp-content/uploads/2020/11/wilfley-centrifugal-pumps-maxalloy-5a-hard-iron-ph-range-h.png)
Impeller Wear in Tailings Application
MAXALLOY® 5A impeller after 97 service days
![](http://wilfley.in/wp-content/uploads/2020/10/wilfley-centrifugal-pumps-27-chrome-impeller.jpg)
Standard hard iron impeller after 40 service days
Photo 1 shows a standard hard iron impeller after only 40 service days. Substantial wear can be seen on the impeller edge and vanes.
![](http://wilfley.in/wp-content/uploads/2020/10/wilfley-centrifugal-pumps-maxalloy-5a-impeller.jpg)
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
![](http://wilfley.in/wp-content/uploads/2020/10/wilfley-centrifugal-pumps-27-chrome-case-1.jpg)
Standard hard iron case after 5 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.
![](http://wilfley.in/wp-content/uploads/2020/10/wilfley-centrifugal-pumps-maxalloy-5a-case.jpg)
MAXALLOY® 5A case after 21 service days
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.
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