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 analysis wt-%	0.8	0.7	0.3	5.4	4.5	1.0	1.2

	Treatment temperatures			hardness
Hot forming	Annealing	Hardening	Tempering	Annealed	working hardness
(please inquire)	800 - 880°C slow cooling (≤ 20/°C/min)	1,100 - 1,140°C Cooling in oil, gas or salt bath	550 - 620°C min. 2x tempering, air cooling	≤ 235 HB	62 - 66 HRC

Physical properties
Thermal expansion coefficient [10^-6/K]	20 - 100°C	20 - 200°C	20 - 300°C	20 - 400°C	20 - 500°C	20 - 600°C
Thermal expansion coefficient [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

Young's modulus = 210 GPa, sample hardened at 1,140°C, 2x tempered at 560°C

Microstructure

DRM3

(in the center of the bar ∅ 100 mm)

Conventional high-speed steel

(Daido)

Tempering treatment

Specimen: square 15 mm, oil quenching, tempering with air cooling

Impact toughness

Specimens: taken from bar steel, in the center of ∅ 100 mm, U-notched specimen

	Heat treatment
	Hardening	Tempering
DRM3	1,140°C, oil hardened	540 - 600°C, double tempered
1.3343	1,210°C, oil hardened	540 - 600°C, double tempered

Hardness at elevated temperatures

Hardness of the matrix high-speed tool steel DRM3 at elevated temperatures

	Heat treatment
	Hardening	Tempering
DRM3	1,140°C, oil hardened	560°C, double tempered
1.3343	1,200°C, oil hardened	580°C, double tempered

Fire crack resistance

Specimen: ∅ 15 mm, 10 mm thick

Heat check resistance of the matrix high-speed tool steel DRM3

	Heat treatment
	Hardening	Tempering
DRM3	1,120°C, oil hardened	560 - 620°C, double tempered
1.3343	1,200°C, oil hardened	560°C, double tempered
Test method	Heat inductively 1,000x to 600°C and cool to 20°C

Fatigue strength / Material fatigue

Specimens: from the center of a bar steel ∅ 100 mm

Fatigue strength of the matrix high-speed tool steel DRM3

	Heat treatment
	Hardening	Tempering
DRM3 (65 HRC)	1,100°C, oil hardened	560°C, double tempered
DRM3 (67 HRC)	1,140°C, oil hardened	550°C, double tempered
1.3343	1,140°C, oil hardened	560°C, double tempered
Test method	Wöhler test at room temperature

Dimensional change during hardening

Specimens: bar steel ∅ 100 mm x 60 mm length

Dimensional change of the matrix high-speed tool steel DRM3 during hardening

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

Hardenability

Influence of cooling rate on toughness

Continuous cooling transformation (CCT) diagram

TTT diagram of the matrix high-speed tool steel DRM3

Hardening process

Salt bath

Vacuum

Transformation temperatures:

AC₁ = 830°C, Ms = 175°C

The hardening temperature of DRM3 is 1,100 – 1,140°C

	Salt bath	Vacuum
Thickness [mm]	Soaking times [min]	Soaking times [min]
to 12	8 - 10	20 - 30 per 25 mm of thickness
to 25	10 - 15
to 36	15 - 20
to 50	20 - 25
to 100	30 - 40	10 - 20 per 25 mm of thickness
above 100	30 - 40	10 - 20 per 25 mm of thickness

Nitriding

Example of the microstructure of a nitrided surface after the PS process from Daido Amistar.

Hardness profile after nitriding

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

The values given are always representative technical values based on our investigations. Unless otherwise stated, they do not constitute guarantees. Please consult us for individual cases.

Steel Glossary