Material grade

FlatRound

Width

Thickness

Length

x x

Daido DCMX

Daido DRM1

Daido DRM2

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 DRM1

Steel Glossary

Daido DRM1

Material info

Chemical composition %

	C	Si	Mn	Cr	Mo	W	V	Co
Typical analysis wt-%	0.5	0.2	0.5	4.2	1.0	3.0	1.3	2.0

	Treatment temperatures			hardness
Hot forming	Annealing	Hardening	Tempering	Annealed	hardened
(please inquire)	800 - 880°C slow cooling	1,100 - 1,140°C Cooling in oil, gas or salt bath	550 - 620°C min. 2x tempering, air cooling	≤ 235 HB	56 – 58 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	20 - 700°C	20 - 800°C
Thermal expansion coefficient [10^-6/K]	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
Thermal conductivity [W/mK]	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
specific heat [J/kgK]	413	487	519	562	616	705	840

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

Microstructure

DRM1

(in the center of the bar ∅ 100mm)

Conventional 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
DRM1	1,140°C, oil hardened	540 - 600°C, double tempered
Conventional steel	1,120°C, oil hardened	540 - 600°C, double tempered

Tempering resistance over time

Tempering resistance of the matrix hot-work high-speed steel DRM1 over time

	Heat treatment
	Hardening	Tempering
DRM1	1,140°C, oil hardened	600°C, double tempered
Conventional steel	1,120°C, oil hardened	610°C, double tempered

Hardness at elevated temperatures

Hardness of the matrix high-speed tool steel DRM1 at elevated temperatures

	Heat treatment
	Hardening	Tempering
DRM1	1,140°C, oil hardened	560°C, double tempered
Conventional steel	1,140°C, oil hardened	560°C, double tempered

Fire crack resistance

Specimen: ∅ 15 mm, 10 mm thick

Heat check resistance of the matrix high-speed tool steel DRM1

	Heat treatment
	Hardening	Tempering
DRM1	1,140°C, oil hardened	560°C, double tempered
Conventional steel	1,140°C, oil hardened	560°C, double tempered
Test method	Heat inductively 1,000x to 700°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 DRM1

	Heat treatment
	Hardening	Tempering
DRM1	1,140°C, oil hardened	560°C, double tempered
Conventional steel	1,140°C, oil hardened	560°C, double tempered
Test method	Wöhler test at room temperature

Hardenability

Sample: round steel Ø 100 mm

Hardenability and notch impact strength of the matrix hot-work high-speed steel DRM1

	Heat treatment
	Hardening	Tempering
DRM1	1,140°C, 200°C/min corresponding to oil hardening	560°C, double tempered

Dimensional change during hardening

Specimens: bar steel ∅ 100 mm x 60 mm length

Dimensional change of the matrix high-speed tool steel DRM1 during hardening

	Heat treatment
	Hardening
DRM1	1,140°C, oil hardened

Hardening process

Salt bath

Vacuum

Nitriding

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

Hardness profile after nitriding

The surface hardness reaches 1,200 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