En-18D

En-24

En-52
X45Cr Si93

214-N

21-12N

Carbon

0.38 - 0.43

0.35 - 0.40

0.40-0.50

0.48-0.58

0.20Max

Silicon

0.10 – 0.35

0.10 – 0.35

3.0 – 3.75

0.25 Max

0.80

Manganese

0.65 – 0.80

0.45 – 0.70

0.30 – 0.60

8.0 – 10.0

1.75

Nickel

-

1.30 – 1.80

0.50 Max

3.25 – 4.50

11.50

Chromium 

0.85 – 1.15

0.90 – 1.40

7.50 – 9.50

20.0 – 23

21.00

Mollybdnum

-

0.20 – 0.35

Nil

Nil

Nil