Special Coatings & Treatments
Sr No
Designation
Major Alloying Elements %
   
C
Mn
Ni
Cr
Mo
Si
N
Others
1

En-18/D

(5140)

0.38

0.43

0.65

0.80

--

0.85

1.00

--

0.10

0.35

--
 
2

En-19

(4140)

0.35

0.45

0.50

0.80

--

0.90

1.50

0.20

0.40

0.10

0.35

--
 
3

En-24

(4340)

0.35

0.45

0.45

0.70

1.30

1.80

0.90

1.40

0.20

0.35

0.10

0.35

--
 
4

En-52

(HNV3 /SUH1)

0.40

0.50

0.30

0.60

<

0.50

7.50

9.50

--

3.0

3.75

--
 
5

En-59

(HNV6/SUH4)

0.74

0.84

0.20

0.60

1.15

1.65

19.0

20.5

--

1.75

2.25

--
 
6

21 - 2 /N
(EV 12)

0.55
8.3
2.2
21.0
--
0.15
0.30
 
7

21 - 4 /N

(EV8/SUH35/36)

0.48

0.58

8.0

10.0

3.25

4.50

20.0

22.0

--

0.25

max

0.38

0.50

C + N

0.9 min

8

21 - 12 /N

(EV4/SUH37)

1.20
1.30
11.5
21.0
--
1.00
--
 
9
Nimonic 80-A
0.05
1.0
Bal.
20.0
--
0.60
--

Fe : 3.0 / Co : 2.0

Ti : 2.4 / Al : 1.4

B : 0.003

10

Pyromel 31

(HEV 8)

0.04
0.20
Bal.
22.7
2.00
0.20
--

Fe : 13.0 / Nb: 0.85

Ti : 2.3 / Al : 1.3

B : 0.005

Material Classification:  
1) AL.S : Alloy Steel Sr. No. 1 / 2 / 3
2) M.S : Martensitic Steel Sr. No. 4 / 5
3) AU.S : Austenitic Steel Sr. No. 6 / 7 / 8
4) SU.A : Super Alloy Steel Sr. No. 9 / 10
   
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