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Abrasion-resistant white cast irons have been alloyed to secure high resistance to abrasive wear.

Abrasion-resistant irons can be classified into five groups but the majority of castings used today are in two groups. One is the nickel containing alloys, known as Ni-Hard. Ni-Hard has been an industry standard for abrasion-resistance for over 60 years. The second white iron group contains high levels of chrome and is commonly referred to as Hi-Chrome iron. When toughness, abrasion-resistance and possibly corrosion resistance are required, the Hi-Chrome group of white irons is superior to Ni-Hard.

1) Low Alloy Abrasion Resistance Cast Iron ( As per IS 7925 )

The chemical composition of the metal for the different grades of Low Alloy types of Abrasion Resistant Cast Iron
GRADE
C
Si
Mn
Cr
P
     BHN
1
2.4-3.4
0.5-1.5
0.2-0.8
2.0
0.15
400
2
2.4-3.4
0.5-1.5
0.2-0.8
2.0
0.5
400
3
2.4-3.0
0.5-1.5
0.2-0.8
2.0
0.15
250

2) Abrasion Resistance White Cast Iron ( Part 2. Nickel Chromium Grades , As per BS 4844, )

Ni-Hard is a white cast iron, alloyed with nickel and chromium suitable for low impact, sliding abrasion applications both wet and dry.

Ni-Hard is used in power generation, brick, asphalt, cement, concrete, rock, sand and gravel industries. Typical castings are mill or mixer liners, mixer tips and slurry pumps.

GRADE
C
Si
Mn
NI
Cr
Mo
P
S
HB
2A
2.7-3.2
0.3-0.8
0.2-0.8
3.0-5.5
1.5-2.5
0.5
0.3
0.15
500
2B
3.2-3.6
0.3-0.8
0.2-0.8
3.0-5.5
1.5-2.5
0.5
0.3
0.15
550
2A
2.4-2.8
1.5-2.2
0.2-0.8
4.0-6.0
8.0-10.0
0.5
0.3
0.15
500
2A
2.8-3.2
1.5-2.2
0.2-0.8
4.0-6.0
8.0-10.0
0.5
0.3
0.15
550
2A
3.2-3.6
1.5-2.2
0.2-0.8
4.0-6.0
8.0-10.0
0.5
0.3
0.15
600
 
3) Abrasion Resistance Cast Iron ( High Chromium Grades, As per IS 4771 / ASTM - 532)
This specification covers a group of white cast irons that have been alloyed to secure high resistance to abrasion.

Castings made of Hi-Chrome Iron, also referred to as Chrome Carbide, are used in the mining, milling, earth-handling, and manufacturing industries.

TYPE 1a
TYPE 1b
TYPE 2
TYPE 3
NiLCr 30/500
NiLCr 34/550
NiLCr 27/500
NiLCr 30/550 NiLCr 34/600
CrMoHC 34/500
CrMoHC 28/500
HCrNi 27/400
HCr 27/400
Total Carbon
2.7-3.3
3.2-3.6
2.5-2.9
2.8-3.3
3.2-3.6
3.1-3.6
2.4-3.1
2.3-3.0
2.3-3.0
Silicon
0.3-0.6
0.3-0.6
1.5-2.2
1.5-2.2
1.5-2.2
0.3-0.8
0.3-0.8
0.2-1.5
0.2-1.5
Manganese
0.3-0.6
0.3-0.6
0.3-0.6
0.3-0.6
0.3-0.6
0.4-0.9
0.4-0.9
1.5 Max
1.5 Max
Nickel
3.0-5.5 3.0-5.5
4.0-6.0
4.0-6.0
4.0-6.0
0.5 Max
0.5 Max
1.2 Max
0.5 Max
Chomium
1.5-2.5
1.5-2.5
8.0-10.0 8.0-10.0 7.5-9.5
14.0-18.0
14.0-18.0
24.0-28.0
24.0-28.0
Molybdenum
0.5 Max
0.5 Max
0.5 Max
0.5 Max
0.5 Max
2.5-3.5
2.5-3.5
0.6 Max
0.6 Max
Sulphur ( Max )
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
Phosphours(Max)
0.3
0.3 0.3
0.3
0.3
0.3
0.3
0.3
0.3