Dimension
.
Shape of Head (HS)
.
Shape of Cotter Groove (CG)
.

Material & Specification (MS)

W: One-piece JIS SUH3

B: Two-piece valve
(21-4N & JIS SUH3 welded on stem)

X: One-piece 21-4N tip-welded
C: Cc: Hard-chromium plated
Ct: Tafftrided
Ch: High-frequency hardened

F: Stellite welded on valve face

.
Material & Specification
Chemical Composition
.
.
C
Si
Mn
P
S
Ni
Cr
Mo
Cu
W
Applied to
Martensitic
Steel
SUH1
0.400.
50
3.00-3.5
0.60
0.030
0.030
0.5

7.50-9.50
.
.
.

In Valve

SUH11
0.45-
0.55
1.00-2.00
0.60
0.030
0.030
-

7.50-9.50

-
- -

In Valve

SUH3
0.30-
0.45
1.80-2.50
0.60
0.030
0.030
0.6

10.00-12.00

0.70-1.30

0.30

.

In Valve
Ex Valve
Seat Insert

SUH4
0.75-
0.85
1.75-2.25
0.20-0.60
0.030
0.030

1.15-1.65

19.00-20.50
-

0.30

-

Ex Valve
(Seat Insert)

Austenitic
Steel
SUH31
0.30-
0.45
1.50-2.50
0.60
0.040
0.030

13.00-15.00

14.00-16.00
.

0.30

2.00-3.00

Ex Valve
(Seat Insert)

SUH36
(21-4N)
0.475-0.575
0.25

8.0-10.00
0.030
0.040-0.090
3.25-4.50

20.00-22.00
.

0.30

.
Ex Valve
SUH37 (21-12N)
0.15-
0.25
0.75-1.00
1.0-1.50
0.025
0.025

10.50-12.50

22.00-20.00
.

0.30

.
Ex Valve
.


C
Cr
W
Fe
Co
Hardness HRC
STELLITE #1
2.5
30.0
12.0
3.0 Max
Bal.
54
STELLITE #6
1.0
28.0
4.0
3.0 Max
Bal.
44
STELLITE #12
1.35
29.0
8.0
2.0
Bal.
47
 
JIS SUH3
Ordinary heat-resistance alloy (martensitic) which has magnetism and is widely applied to Intake Valve for internal combustion engine.
 
JIS SUH36 (21-4N)
High quality heat resistance alloy belonging to austemtic steel (non-magnetic) that is excellent in wear and corrosion resistance under high temperature and applicable to Exhaust Valve for Heavy Duty Engine use.
 
STELLITE
Cobalt-bast alloy to be welded on valve face (Exhaust Valve for Heavy Duty Engine) for the purpose of specially improving wear and corrosion resistance under high temperature.
 
 
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