Steel Glossary
Daido DRM3

Chemical Composition %
C Si Mn Cr Mo W V
Typical Composition (Weight %) 0.8 0.7 0.3 5.4 4.5 1.0 1.2
Treatment Temperatures Hardness
Hot Forming Annealing Hardening Tempering Soft Annealing Hardened
(please inquire) 800 - 880°C
Slow cooling (≤ 20°C/min)
1,100 - 1,140°C
Quenching in oil, gas, or salt bath
550 - 620°C
Minimum 2x tempering, air-cooling
≤ 235 HB 62 - 66 HRC
Physical Properties
Coefficient of thermal expansion [10-6/K] 20 - 100°C 20 - 200°C 20 - 300°C 20 - 400°C 20 - 500°C 20 - 600°C
11.1 11.5 11.9 12.2 12.4 12.7
Thermal Conductivity [W/mK] 25°C 200°C 300°C 400°C 500°C 600°C
18 21.5 23.1 24.4 25.2 26.0
Specific Heat [J/kgK] 25°C 200°C 300°C 400°C 500°C 600°C
424 480 520 560 698 830

E-Modul = 210 GPa, The Sample Was Hardened At 1,140°C And Tempered Twice At 560°C

Microstructure
DRM3

(In The Center Of The Bar, Diameter 100 mm)

Microstructure - DRM3
Conventional Hot Work Steel

(Daido)

Microstructure Conventional Hot Working Steel
Tempering Treatment

Sample: Square 15 mm, quenched in oil, tempered with air cooling

Tempering Treatment - DRM3
Charpy Impact Toughness

Samples: taken from round bar, in the center of the diameter 100 mm, notched U-shaped specimen

Charpy Impact Toughness - DRM3
Heat Treatment
Hardening Tempering
DRM3 1,140°C, oil quenching 540 - 600°C, double tempering
1.3343 1,210°C, oil quenching 540 - 600°C, double tempering
Hardness at Elevated Temperatures

 

Hardness at Elevated Temperatures - DRM3
Heat Treatment
Hardening Tempering
DRM3 1,140°C, oil quenching 560°C, double tempering
1.3343 1,200°C, oil quenching 580°C, double tempering
Crack Resistance To Burning

Sample: ∅ 15 mm, 10 mm thick

Crack resistance to burning - DRM3
Heat Treatment
Hardening Tempering
DRM3 1,120°C, oil quenching 560 - 620°C, double tempering
1.3343 1,200°C, oil quenching 560°C, double tempering
Test method Inductive heating 1,000 times to 600°C and cooling to 20°C
Fatigue Strength / Material Fatigue

Specimens: taken from the center of a rod with ∅ 100 mm

Dauerfestigkeit / Materialermüdung - DRM3
Fatigue Strength / Material Fatigue

Test Specimens: taken from the center of a rod with diameter ∅ 100 mm

Heat Treatment
Hardening Tempering
DRM3 (65 HRC) 1,100°C, oil quenching 560°C, double tempering
DRM3 (67 HRC) 1,140°C, oil quenching 550°C, double tempering
1.3343 1,140°C, oil quenching 560°C, double tempering
Test Method Wöhler Test at room temperature
Dimensional Changes during Hardening

Test Specimens: Rod steel ∅ 100 mm x 60 mm length

Dimensionsänderung beim Härten - DRM3
Heat Treatment
Hardening
DRM3 1,140°C, hardened in salt bath
Hardenability

Influence of Cooling Rate on Bending Strength

Hardenability - DRM3
Continuous Cooling Transformation Diagram
TTT Diagramm - DRM3
Hardening Process
Salt Bath
Hardening Process: Salt Bath - DRM3
Vacuum
Hardening Process: Vacuum - DRM3

Umwandlungstemperaturen:

AC1 = 830°C, Ms = 175°C

The Hardening Temperature of DRM3 is at 1,100 – 1,140°C

Salt Bath Vacuum
Thickness [mm] Holding Times [min] Holding Times [min]
to 12 8 - 10 20 - 30
pro 25 mm Thickness
to 25 10 - 15
to 36 15 - 20
to 50 20 - 25
to 100 30 - 40 10 - 20
pro 25 mm Thickness
over 100 30 - 40
Nitriding
Nitriding - DRM3

Example of the microstructure of a nitrided surface using the PS process by Daido Amistar.

Hardness Profile After Nitriding
Hardness profile after nitriding - DRM3

The surface hardness reaches 1,280 HV with NHD = 0.2 mm.

Representative technical values are always given based on our investigations. If not stated otherwise, they do not constitute guarantees. Please seek individual advice if needed.

Material info

Downloads

Daido DRM3

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