Material grade

FlatRound

Width

Thickness

Length

x x

Daido DCMX

Daido DRM1

Daido DRM3

Daido NAK80

Hardox 400

Hardox 450

Hardox 500

Hardox 600

Minkor

TENA STEEL

Toolox 33

Toolox 44

1.1730

1.2311

1.2312

1.2343

1.2343 ESU

1.2363

1.2379

1.2436

1.2767

1.2842

1.3343

1.4112

1.7131

Daido DRM3

Steel Glossary
Daido DRM3

Material info

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
Coefficient of thermal expansion [10^-6/K]	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
Thermal Conductivity [W/mK]	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
Specific Heat [J/kgK]	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)

Conventional Hot Work Steel

(Daido)

Microstructure Conventional Hot Working Steel

Tempering Treatment

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

Charpy Impact Toughness

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

	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

	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

	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

	Heat Treatment
	Hardening
DRM3	1,140°C, hardened in salt bath

Hardenability

Influence of Cooling Rate on Bending Strength

Continuous Cooling Transformation Diagram

Hardening Process

Salt Bath

Vacuum

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	10 - 20 pro 25 mm Thickness

Nitriding

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

Hardness Profile After Nitriding

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.