wear_resistant_irons

Wear Resistant 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 where 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