Steel Glossary
Daido DRM1

Chemical Composition %
C Si Mn Cr Mo W V Co
Typical Composition (Weight %) 0.5 0.2 0.5 4.2 1.0 3.0 1.3 2.0
Treatment Temperatures Hardness
Hot Forming Annealing Hardening Tempering Soft Annealing Hardened
(please inquire) 800 - 880°C
Slow cooling
1,100 - 1,140°C
Quenching in oil, gas, or salt bath
550 - 620°C
Minimum 2x tempering, air-cooling
≤ 235 HB 56 – 58 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 20 - 700°C 20 - 800°C
11.2 11.4 11.7 11.9 12.2 12.4 12.7 12.3
Thermal Conductivity [W/mK] 25°C 200°C 300°C 400°C 500°C 600°C 700°C
22.4 26.3 27.3 28.6 28.4 29.1 28.8
Specific Heat [J/kgK] 25°C 200°C 300°C 400°C 500°C 600°C 700°C
413 487 519 562 616 705 840

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

Microstructure
DRM1

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

Microstructure - DRM1
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 - DRM1
Charpy Impact Toughness

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

Charpy Impact Toughness - DRM1
Heat Treatment
Hardening Tempering
DRM1 1,140°C, oil quenched 540 - 600°C, double tempered
Conventional Steel 1,120°C, oil quenched 540 - 600°C, double tempered
Time-dependent tempering resistance
Time-dependent tempering resistance - DRM1
Heat Treatment
Hardening Tempering
DRM1 1,140°C, oil quenched 600°C, double tempered
Conventional Steel 1,120°C, oil quenched 610°C, double tempered
Hardness at Elevated Temperatures
Hardness at elevated temperatures - DRM1
Heat Treatment
Hardening Tempering
DRM1 1,140°C, oil quenched 560°C, double tempered
Conventional Steel 1,140°C, oil quenched 560°C, double tempered
Fire Crack Resistance

Sample: ∅ 15 mm, 10 mm thick

Crack resistance to burning - DRM1
Heat Treatment
Hardening Tempering
DRM1 1,140°C, oil quenched 560°C, double tempered
Conventional Steel 1,140°C, oil quenched 560°C, double tempered
Test Method Induction heating to 700°C, cooling to 20°C, repeated 1,000 times
Endurance Strength / Material Fatigue

Samples: taken from the center of a bar ∅ 100 mm

Endurance strength / Material fatigue - DRM1
Heat Treatment
Hardening Tempering
DRM1 1,140°C, oil quenched 560°C, double tempered
Konventional Steel 1,140°C, oil quenched 560°C, double tempered
Test Method Wöhler bending Test at room temperature
Hardenability

Sample: Round steel ∅ 100 mm

Hardenability - DRM1
Hardenability - DRM1
Wärmebehandlung
Härten Anlassen
DRM1 1,140°C, 200°C/min entsprechend Ölhärtung 560°C, zweifach angelassen
Dimensional Changes During Hardening

Specimens: Rod steel ∅ 100 mm x 60 mm length

Dimensional changes during hardening - DRM1
Heat Treatment
Hardening
DRM1 1,140°C, oil quenched
Hardness processes
Salt bath
Hardening Process: Salt Bath Hardening - DRM1
Vacuum
Hardening Process: Vacuum Hardening - DRM1
Nitriding
Nitriding - DRM1

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

Hardness profile after nitriding.
The hardness profile after Nitriding - DRM1

The surface hardness reaches 1,200 HV with NHD = 0.2 mm.

Representative technical values are provided based on our investigations. Unless otherwise stated, they do not constitute guarantees. Please seek individual advice for specific cases.

Material info

Downloads

Daido DRM1

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