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

Technical Data_DSR7

Top of Page

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

Technical Data_LAK41
  • Compression test
    Under spheroidizing annealing
  • Salt spray test
    35℃、5%NaCl、96h、1050℃ quenching and tempering
 
180℃/2hrAC
Evaluation
600℃/1hrAC
Evaluation
LAK41
LAK41_180℃/2hrAC
B
LAK41_600℃/1hrAC
D
C
D
B
D
SUS440C
SUS440C_180℃/2hrAC
D
SUS_600℃/1hrAC
D
D
D
D
D

Top of Page

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
950~1000
Oil quenching
700~750
Speed 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

Machinability_DSR16FC、DSR20FD
Top of Page