Sepahan Foolad Atashgah Foundry Industries Company

High-Chrome Alloy Cast Iron

High-Chrome Alloy Cast Irons and Their Functional Properties

High-chrome alloy cast irons are recognized as one of the advanced engineering materials due to their excellent wear resistance and adequate strength, making them highly suitable for applications under harsh operating conditions. These cast irons, classified as white cast irons, feature a martensitic structure with precipitated carbides, which play a key role in enhancing wear resistance.

The martensitic structure of these cast irons enhances hardness and mechanical strength, while the presence of chromium carbides in the matrix provides exceptional wear resistance. This combination of properties makes high-chrome cast irons an ideal choice for conditions where components must withstand severe wear and moderate mechanical impacts.

In applications where components are exposed to both moderate impacts and intense wear, nickel-chrome cast irons are recognized as a favorable option. The addition of nickel to the cast iron alloy improves toughness and impact resistance, while chromium continues to play a primary role in wear resistance. These characteristics make nickel-chrome cast irons highly effective in specific industries, such as mining equipment, cement production, and material processing.

Overall, high-chrome alloy cast irons are considered an effective alternative to high-chrome steels in many industrial applications due to their unique properties, including high wear resistance, adequate hardness, and the ability to endure impact conditions. These features make them a reliable and cost-effective material for use in demanding operational environments.

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Grade

C (%)

Cr (%)

Si (%)

Mn (%)

Ni (%)

Other Elements (%)

Applications

ASTM A532 Class II A

2.0-3.3

11-13

1.0-2.2

0.5-2.5

Mo: 0.5 max

Abrasion-resistant liners, pumps

ASTM A532 Class II B

2.5-3.6

23-30

0.5-1.5

0.5-2.0

Mo: 0.5-1.5

High-wear conditions, slurry pumps

ASTM A532 Class II C

2.5-3.6

16-23

0.5-1.5

0.5-2.0

Mo: 1.0-1.5

Medium corrosion and abrasion resistance

ASTM A532 Class III A

2.3-3.6

25-30

0.6-1.2

0.5-2.0

Mo: 0.5-1.5

Cement mill liners, crushers

ASTM A532 Class III B

2.0-3.5

28-32

0.8-1.5

0.5-2.0

Mo: 1.0-2.0, Cu: 0.5 max

Severe abrasive environments

ASTM A532 Class III C

2.5-3.5

30-35

0.5-1.5

0.5-1.5

Mo: 1.0-2.0

Severe high-wear industrial applications

Nihard 1

3.0-3.6

1.8-3.2

0.3-1.0

0.5-1.0

Mo: 0.2-0.6

Mills, crushers, and industrial grinders

Nihard 4

2.8-3.6

7.0-11.0

0.5-1.0

0.8-1.2

Mo: 0.2-0.6

Slurry pumps, coal mill parts

High-Chromium 15% Cr

2.2-3.5

14-18

0.5-1.5

0.5-2.0

Mo: 0.5-1.5, V: 0.5 max

Wear plates, grinding media

High-Chromium 20% Cr

2.5-3.5

19-22

0.5-1.5

0.5-1.5

Mo: 0.5-2.0

High-abrasion and mild corrosion environments

High-Chromium 25% Cr

2.5-3.5

24-28

0.8-1.5

0.5-1.5

Mo: 0.5-1.5, Cu: 0.5 max

Slurry pump impellers

Cr35

2.5-3.6

28-35

0.8-1.5

0.5-1.2

Mo: 0.8-2.0, Cu: 0.5 max

High-impact and corrosion environments

Cr26

2.8-3.6

24-28

0.5-1.5

0.5-1.0

Mo: 0.8-1.5, V: 0.5-1.0

Abrasion-resistant pump liners

Cr20

2.3-3.5

18-20

0.5-1.0

0.5-1.0

Mo: 0.5-1.0

Mining applications, cyclones

HC250

2.5-3.5

23-25

1.0 max

0.8 max

Mo: 1.0-2.0, Cu: 0.5 max

Cement plants, wear liners

HC300

2.8-3.8

27-30

1.0 max

0.8 max

Mo: 1.0-2.0, Cu: 0.5 max

Extreme wear-resistance applications

HC350

2.5-3.6

32-35

0.8-1.5

0.5-1.0

Mo: 1.5-2.5, Nb: 0.5 max

Heavy-duty slurry pumps

Abrasion-Resistant 1

2.8-3.6

15-17

0.8-1.2

1.0 max

Mo: 0.5 max

Cement and mining applications

Abrasion-Resistant 2

2.8-3.8

19-22

1.0-1.5

1.0 max

Mo: 0.5-1.5, Cu: 0.5 max

Crushers, mill liners

Abrasion-Resistant 3

2.8-3.8

25-30

0.5-1.5

0.8-1.5

Mo: 1.0-2.0, Nb: 0.5-1.0

Severe wear and corrosion applications

Produced Materials

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