| The quench hardening treatment
is possible by the Cr steel including 0.08%C or more. |
| Grade
|
JIS
Grade |
Chemical
composition (mass %) |
Character
and usage |
| C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
| U403 |
SUS403 |
0.15
Max |
0.50
Max |
1.00
Max |
0.040
Max |
0.030
Max |
0.60
Max |
11.50～
13.00 |
- |
Turbine
blade |
| U410 |
SUS410 |
0.15
Max |
1.00
Max |
1.00
Max |
0.040
Max |
0.030
Max |
0.60
Max |
11.50～
13.50 |
- |
Good
corrosion resistance and workabilitry
General usage, Cutlery |
| U410J1 |
SUS410J1 |
0.08～
0.18 |
0.60
Max |
1.00
Max |
0.040
Max |
0.030
Max |
0.60
Max |
11.50～
14.00 |
0.30～
0.60 |
Improving
corrosion resistance of 410
Turbine blade, Parts for high temperature. |
| U416 |
SUS416 |
0.15
Max |
1.00
Max |
1.25
Max |
0.060
Max |
0.15
以上 |
0.60
Max |
12.00～
14.00 |
0.60
Max |
The
best machinability in stainless steels |
| U420J1 |
SUS420J1 |
0.16～
0.25 |
1.00
Max |
1.00
Max |
0.040
Max |
0.030
Max |
0.60
Max |
12.00～
14.00 |
- |
High
hardening hardness
Corrosion resistance better than 410
Turbine blade. |
| U420J2 |
SUS420J2 |
0.26～
0.40 |
1.00
Max |
1.00
Max |
0.040
Max |
0.030
Max |
0.60
Max |
12.00～
14.00 |
- |
Higher
hardening hardness than 420J1
Cutlery, Nozzle, Seat, Valve, Scale |
| U420F |
SUS420F |
0.26～
0.40 |
1.00
Max |
1.25
Max |
0.060
Max |
0.15
以上 |
0.60
Max |
12.00～
14.00 |
0.60
Max |
Improving
machinability of 420J2 |
| U431 |
SUS431 |
0.20
Max |
1.00
Max |
1.00
Max |
0.040
Max |
0.030
Max |
1.25～
2.50 |
15.00～
17.00 |
- |
High
mechanical property by including Ni
Corrosion resistance better than
410, 430 |
| SM1 |
SUS440A |
0.60～
0.75 |
1.00
Max |
1.00
Max |
0.040
Max |
0.030
Max |
0.60
Max |
16.00～
18.00 |
0.75
Max |
Good hardening hardenability
Higher toughness than 440B, 440C
Cutlery, Gauge, Bearing. |
| SM2 |
SUS440B |
0.75～
0.95 |
1.00
Max |
1.00
Max |
0.040
Max |
0.030
Max |
0.60
Max |
16.00～
18.00 |
0.75
Max |
Higher
hardening hardness than 440A
Higher toughness than 440C
Cutlery and valve. |
| SM3 |
SUS440C |
0.95～
1.20 |
1.00
Max |
1.00
Max |
0.040
Max |
0.030
Max |
0.60
Max |
16.00～
18.00 |
0.75
Max |
Highest
hardness in all stainless steels and heat resisting steels
Nozzle, Bearing. |
| SMF |
SUS440F |
0.95～
1.20 |
1.00
Max |
1.25
Max |
0.060
Max |
0.15
以上 |
0.60
Max |
16.00～
18.00 |
0.75
Max |
Improving
machinability of 440C |
| Grade |
JIS
Grade |
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
Character
and usage |
| Chemical
composition (mass %) |
