Class

Type

Designation

Carbon

Manganese

Silicone

 Nickel

Chromium

Molybdenum

Copper

Phosphorus

 Sulfur

I

A

Ni-Cr-HC

3.0 to 3.6

1.3 max.

0.8 max

3.3 to 5.0

1.4 to 4.0

1.0 max

0.30 max

0.15 max

I

B

Ni-Cr-LC

2.5 to 3.0

I

C

Ni-Cr-GB

2.9 to 3.7

I

D

Ni-Hi-Cr

2.5 to 3.6

II

A

12% Cr

2.4 to 2.8

1.2 max

II

B

15%
Cr-Mo-LC

2.4 to 2.8

II

C

15%
Cr-Mo-HC

2.8 to 3.6

II

D

20%
Cr-Mo-LC

2.0 to 2.6

II

E

20%
Cr-Mo-HC

2.6 to 3.2

III

A

25% Cr

2.3 to 3.0