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Composition of Valve Steels

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Designation	Major Alloying Elements %
Designation	C	Mn	Ni	Cr	Mo	Si	N	Others
En-18/D (5140)	0.38 0.43	0.65 0.80	-	0.85 1.00	-	0.10 0.35	-
En-19 (4140)	0.35 0.45	0.50 0.80	-	0.90 1.50	0.20 0.40	0.10 0.35	-
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	-
En-52 (HNV3 /SUH1)	0.40 0.50	0.30 0.60	< 0.50	7.50 9.50	-	3.0 3.75	-
En-59 (HNV6/SUH4)	0.74 0.84	0.20 0.60	1.15 1.65	19.0 20.5	-	1.75 2.25	-
21 - 2 /N (EV 12)	0.55	8.3	2.2	21.0	-	0.15	0.30
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.
21 - 12 /N (EV4/SUH37)	1.20	1.30	11.5	21.0	-	1.00	-
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
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 :

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

Products

Engine Valves