Materials Produced
Ni Hard Chrome Irons
Wear Resistant Irons are also referred to as High Chrome Alloys, Abrasion Resistant Irons, White Irons and Ni hard. This family of materials has been developed for a variety of applications were abrasion is evident.
White irons are generally specified for applications requiring a hardness range of 200 / 300 BHN, High Chrome Alloys (typically 28% Cr addition) are specified for applications requiring BHN figures of 600 – 650 BHN and Ni Hard castings are supplied in a range of grades that offer a hardness range of between 500 – 600 BHN.
With post casting heat treatments the hardness range of High Chrome Alloys can be extended to 700HBN.
All of the wear resistant materials available have alloy additions to varying degrees. Chrome is the main element but copper, molybdenum and vanadium can be introduced to the base Grey Iron material.
All of the Wear Resistant Cast materials present challenges when it comes to machining. Careful use of steel inserts and ceramic tooling and know how allows us to undertake the supply of fully machined castings.
Ni-Hard Specification BS 4844 1986
| Grade | Chemical Composition | |||||||||
| C% | Si% | Mn% | Ni% | Cr% | Mo% | Cu% (max) | P% (max) | S% (max) | HB* | |
| 2A | 2.7 - 3.2 | 0.3 - 0.8 | 0.2 - 0.8 | 3.0 - 5.5 | 1.5 - 3.5 | 0.5 max | - | 0.15 | 0.15 | 500 |
| 2B | 3.2 - 3.6 | 0.3 - 0.8 | 0.2 - 0.8 | 3.0 - 5.5 | 1.5 - 3.5 | 0.5 max | - | 0.15 | 0.15 | 550 |
| 2C | 2.4 - 2.8 | 1.5 - 2.2 | 0.2 - 0.8 | 4.0 - 6.0 | 8.0 - 10. | 0.5 max | - | 0.10 | 0.15 | 500 |
| 2D | 2.8 - 3.2 | 1.5 - 2.2 | 0.2 - 0.8 | 4.0 - 6.0 | 8.0 - 10. | 0.5 max | - | 0.10 | 0.15 | 550 |
| 2E | 3.2 - 3.6 | 1.5 - 2.2 | 0.2 - 0.8 | 4.0 - 6.0 | 8.0 - 10.0 | 0.5 max | - | 0.10 | 0.15 | 600 |
| 3A | 1.8 - 3.0 | 1.0 | 0.5 - 1.5 | 2.0 max | 14 - 17 | 2.5 max | 2.0 max | 0.10 | 0.10 | 600 |
| 3B | 3.0 - 3.6 | 1.0 | 0.5 - 1.5 | 2.0 max | 14 - 17 | 3.0 max | 2.0 max | 0.10 | 0.10 | 650 |
| 3C | 1.8 - 3.0 | 1.0 | 0.5 - 1.5 | 2.0 max | 17 - 22 | 3.0 max | 2.0 max | 0.10 | 0.10 | 600 |
| 3D | 2.0 - 2.8 | 1.0 | 0.5 - 1.5 | 2.0 max | 22 - 28 | 1.5 max | 2.0 max | 0.10 | 0.10 | 600 |
| 3E | 2.8 - 3.5 | 1.0 | 0.5 - 1.5 | 2.0 max | 22 - 28 | 1.5 max | 2.0 max | 0.10 | 0.10 | 600 |
| 3F | 2.0 - 2.7 | 1.0 | 0.5 - 1.5 | 2.0 max | 11 - 13 | 2.5 max | 2.0 max | 0.10 | 0.10 | 600 |
| 3G | 2.7 - 3.4 | 1.0 | 0.5 - 1.5 | 2.0 max | 11 - 13 | 3.0 max | 2.0 max | 0.10 | 0.10 | 650 |
Note: Toughness and resistance to repeated shock increase as the carbon content decreases.
* In heat-treated condition
