ABRASION RESISTANT IRONS5 Tonnes

White Irons

The unalloyed White Irons have a hardness of 200-350 BHN the lower end of the hardness scale can be machined but generally are used as cast.

The use of white irons is generally in low impact abrasive situations such as liner plates and abrasive material pump cases.

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Ni-Hard

(Nickel - Chromium Alloyed)

In these irons a development of iron-chromium carbides produce a tougher more abrasion resistant iron. Hardness between 450-600 BHN

The use for Ni-Hards are used in pulverising, crushing and impact wear plates also in heavy duty pump casings and impellers for slurry and gravel applications.

High Chromium Alloys

All the white irons are difficult to machine, however advances in ceramic machining tips have vastly improved the prospects.

They are nearly impossible to drill and tap and have steel inserts cast into the casting to allow drilling and tapping to take place. Hardness between 600-650 BHN

Unalloyed and low alloy grades BS 4844 White Iron
Grade Carbon % Silicon % Manganese % Chrome % Phosphorus %
1A* 2.4 - 3.4 0.5 - 1.5 0.2 - 0.8 2.0 max O.15 max
1B 2.4 - 3.4 0.5 - 1.5 0.2 - 0.8 2.0 max 0.50 max
1C 2.4 - 3.0 0.5 - 1.5 0.2 - 0.8 2.0 max 0.15 max
*Most Common Grade 1A
Nickel Chrome alloys BS 4844 Ni-Hard Irons
Grade Carbon % Silicon % Manganese % Nickel % Chrome %
2A 2.7 - 3.2 0.3 - 0.8 0.2 - 0.8 3.0 - 5.5 1.5 - 3.5
2B* 3.2 - 3.6 0.3 - 0.8 0.2 - 0.8 3.0 - 5.5 1.5 - 3.5
2C 2.4 - 2.8 1.5 - 2.2 0.2 - 0.8 4.0 - 6.0 8.0 - 10.0
2D 2.8 - 3.2 1.5 - 2.2 0.2 - 0.8 4.0 - 6.0 8.0 - 10.0
2E 3.2 - 3.6 1.5 - 2.2 0.2 - 0.8 4.0 - 6.0 8.0 - 10.0
*Most Common Grade 2B
High Chrome irons BS 4844
Grade Carbon % Silicon % Manganese % Moly. % Nickel % Chrome % Copper %
3A 1.8 - 3.0 1.0 max 0.5 - 1.50 2.5 max 2.0 max 14 - 17 2.0 max
3B 3.0 - 3.6 1.0 max 0.5 - 1.5 3.0 max 2.0 max 14 - 17 2.0 max
3C 1.8 - 3.0 1.0 max 0.5 - 1.5 3.0 max 2.0 max 17 - 22 2.0 max
3D 2.0 - 2.8 1.0 max 0.5 - 1.5 1.5 max 2.0 max 22 - 28 2.0 max
3E* 2.8 - 3.5 1.0 max 0.5 - 1.5 1.5 max 2.0 max 22 - 28 2.0 max
3F 2.0 - 2.7 1.0 max 0.5 - 1.5 2.5 max 2.0 max 11 - 13 2.0 max
3G 2.7 - 3.4 1.0 max 0.5 - 1.5 3.0 max 2.0 max 11 - 13 2.0 max
*Most Common Grade 3E