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Martensitic Stainless Steel
High-strength Martensitic Stainless Steel : DSR7
Features and Applications
| Features | Hardness is superior to SUS440C by quenching and tempering. |
| Applications | Micro shaft, nozzle, corrosion resistant bearing, knife |
Chemical Composition
| DAIDO BRAND | Chemical Composition（mass%） | JIS | ||
| C | Cr | Mo | ||
| DSR7 | 0.7 | 12.0 | Added | - |
Characteristics
- Hardness is superior to SUS440C by quenching and tempering.
- Corrosion resistance is equivalent to SUS440C.
- Machining, grindability, cold workability is better than SUS440C.
- Good rolling fatigue strength
Technical Data
Martensitic Stainless Steel of Improved Cold Workability: LAK41, LAK42
Features and Applications
| Features | Cold workable under spheroidizing annealed condition. High hardness is achieved by quenching and tempering. |
| Applications | Shaft. screw, valve, tapping screw, bearing, deformed rolling and drawing |
Chemical Composition
| DAIDO BRAND | Chemical Composition（mass%） | JIS | ||
| C | Cr | Mo | ||
| LAK41 | 0.50 | 16.0 | Added | - |
| LAK42 | 0.58 | 13.0 | Added | - |
Characteristics
LAK41
- Hardness is HRC55～59 by low tempering. It is better than SUS420J2 and almost equivalent to SUS440C.
- Corrosion resistance is superior to SUS440C and SUS420J2.
- Cold and warm workability is almost equivalent to SUS420J2.
LAK42
- This is the steel for cold forging focusing on quenching and tempering hardnesｓ more than LAK41.
- Harness is higher than LAK41 and HRC58 to 60 can be obtained by low temperature tempering.
- Corrosion proof is slightly lower than LAK41.
- Cold workability shows the same characteristics as SUS 20J2 at the state of globular tempering.
Technical Data
-
Compression test
Under spheroidizing annealing
- Salt spray test
35℃、5%NaCl、96h、1050℃ quenching and tempering
| 180℃/2hrAC | Evaluation | 600℃/1hrAC | Evaluation | |
| LAK41 |
|
B |
|
D |
| C | D | |||
| B | D | |||
| SUS440C |
|
D |
|
D |
| D | D | |||
| D | D |
Super Free-cutting Martensitic Stainless Steel : DSR16FC,DSR20FD
Features and Applications
| Features | Stainless steel with improved machinability by adding free-cutting component |
| Applications | Shaft for precision machining (e.g. motor, printer) |
Chemical Composition
| DAIDO BRAND | Chemical Composition（mass%） | JIS | |||||
| C | Si | Mn | S | Cr | Free-cutting element | ||
| DSR16FC | 0.14 | 0.3 | 1.2 | >0.15 | 12.4 | Added | - |
| DSR20FD | 0.32 | 0.3 | 1.0 | >0.15 | 12.3 | Added | - |
Mechanical Properties
| DAIDO BRAND | Mechanical Properties | Heat treatment condition（℃） | ||||
|
0.2%proof stress （N/mm2） |
Tensile strength （N/mm2） |
Elongation （%） |
Reduction （%） |
Hardness （HB） |
||
| DSR16FC | ≧345 | ≧590 | ≧20 | ≧50 | ≧174 |
950～1000Oil quenching 700～750Speed cooling |
| DSR20FD | ≧540 | ≧740 | ≧12 | ≧40 | ≧217 |
920～980 Oil quenching 600～750 Speed cooling |
Characteristics
DSR16FC
- Ultra free-cutting stainless steel by adding free-cutting component to SUS416.
- Machinability is better than SUS416.
- Hardenability is equivalent to SUS416.
DSP20FD
- Ultra free-cutting stainless steel by adding free-cutting component to SUS420F2.
- Machinability is better than SUS420F and SUS420F2.
- Hardenability is equivalent to SUS420J2
Machinability
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