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Daido DCMX
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1.1730
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1.2363
1.2379
1.2436
1.2767
1.2842
1.3343
1.4112
1.7131
 
Daido DRM2

Steel Glossary
Daido DRM2

Material info
Chemical composition %
C Si Mn Cr Mo W V
Typical analysis wt.-% 0.6 0.3 0.5 5.5 2.4 1.0 1.0
Treatment temperatures hardness
Hot forming Annealing Hardening Tempering Annealed hardened
(please inquire) 800 - 880°C
slow cooling (≤ 20°C/min)		 1,050 - 1,120°C
Cooling in oil, gas or salt bath		 550 - 620°C
min. 2x tempering, air cooling 		≤ 235 HBW 58 - 62 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
11.0 11.4 11.8 12.1 12.3 12.6 12.4 12.9
Thermal conductivity [W/mK] 25°C 200°C 300°C 400°C 500°C 600°C 700°C
23.2 26.9 27.9 29.0 28.8 29.2 29.6
458 518 555 598 659 756 910

Young's modulus = 210,000 MPa, Specimen hardened at 1,120°C, 2x tempered at 560°C

Microstructure
DRM2

(in the center of the bar ∅ 100 mm)

Microstructure DRM2 Matrix high-speed steel in ESR quality
Conventional high-speed steel

(Daido)

Microstructure conventional high-speed steel
Tempering treatment

Specimen: square bar 15 mm, Oil quenching, tempering with air cooling

Tempering diagram for DRM2 Matrix high-speed steel in ESR quality The diagram shows the hardness (HRC) of steel DRM2 Matrix high-speed steel in ESR quality as a function of tempering temperature. ≈ 1,100°C 1,120°C conv. Matrix-HSS MH85 (1,100°C) 520 540 560 580 600 Tempering temperature [°C], double tempered, each hardness [HRC] 70 65 60 55 50 wie\nabgeschreckt
Impact toughness

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

Impact toughness diagram of DRM2 Matrix high-speed steel in ESR quality The diagram compares the toughness (J/cm²) of DRM2 Matrix high-speed steel in ESR quality with conventional high-speed steel as a function of hardness (HRC). hardness [HRC] Impact toughness [J/cm2] 200 150 100 50 0 56 58 60 62 64 DRM2 (Longitudinal direction) DRM2 (Transverse direction) conv. Matrix-HSS MH85 (Longitudinal direction) conv. Matrix-HSS MH85 (Transverse direction)
Heat treatment
Hardening Tempering
DRM2 1,120°C, oil hardened 540 - 600°C, double tempered
conventional steel 1,140°C, oil hardened 540 - 600°C, double tempered
Fire crack resistance

 

Fire crack resistance diagram of DRM2 Matrix high-speed steel in ESR quality A bar chart showing the number of cracks after thermal cycles for DRM2 Matrix high-speed steel in ESR quality compared to steel 1.3343. DRM2 (62HRC) conv. Matrix-HSS MH85 (61HRC) Maximum crack length [μm] 60 0 10 20 30 40 50
Heat treatment
Hardening Tempering
DRM2 1,120°C, oil hardened 560°C, double tempered
1.3343 1,140°C, oil hardened 580°C, double tempered
Fatigue strength / Material fatigue

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

Wöhler curve for fatigue strength of DRM2 Matrix high-speed steel in ESR quality Wöhler diagram showing bending stress versus number of load cycles for DRM2 Matrix high-speed steel in ESR quality compared to conventional high-speed steel. → → → Spannung [MPa] 1,600 1,400 1,200 1,000 800 600 400 Load cycles to failure 10 4 10 5 10 6 10 7 10 8 DRM2 (62HCR) conv. Matrix-HSS MH 85 (61HRC)
Heat treatment
Hardening Tempering
DRM2 (65 HRC) 1,120°C, oil hardened 560°C, double tempered
conventional steel 1,120°C, oil hardened 560°C, double tempered
Test method Wöhler test at room temperature
Härtbarkeit

Influence of cooling rate on bending strength

Hardenability diagram: Impact toughness of DRM2 Matrix high-speed steel in ESR quality The diagram shows the impact toughness of DRM2 Matrix high-speed steel in ESR quality as a function of hardness. Impact toughness [J/mm2] U-notched specimen Cooling rate[°C/min] 50 40 30 20 10 0 1 10 10 2 10 3
Hardenability diagram: Tempering hardness of DRM2 Matrix high-speed steel in ESR quality The diagram shows the tempering hardness of DRM2 Matrix high-speed steel in ESR quality after hardening. Equivalent diameter at 6 bar Gas quenching [mm] Tempering hardness [HRC] 65 60 55 400 300 200 100
Heat treatment
Hardening Tempering
DRM2 1,120°C, 200°C/min
equivalent to oil hardening		 560°C, double tempered
Dimensional change during hardening

Specimens: bar steel ∅ 100 mm x 60 mm Length

Dimensional change diagram of DRM2 Matrix high-speed steel in ESR quality during hardening The diagram shows the percentage length and diameter change of DRM2 Matrix high-speed steel in ESR quality after hardening in salt bath. 0.2 0.1 0 -0.1 -0.2 relative dimensional change [%] 0.5 0.4 0.3 wie\ngehärtet Tempering temperature [°C], double tempered, each 520 540 560 580 600 620 Lateral/Longitudinal direction Radial/Diameter direction
Heat treatment
Hardening
DRM2 1,120°C,
hardened in salt bath
Drillability

Specimens: bar steel ∅ 100 mm x 60 mm Length

Drillability diagram of DRM2 Matrix high-speed steel in ESR quality The diagram shows the drillability of DRM2 Matrix high-speed steel in ESR quality. Cutting speed [m/min.] Cutting length [mm] 10 10 2 10 3 10 4 100 1 10 Material grade: as annealed, Tool: NACHI SD (uncoated) ø5mm, Cylindrical shank drill, Feed: 0,15mm/U, Drilling depth: 20mm, Coolant: without DRM2 conv. Matrix-HSS
Heat treatment
Hardening
DRM2 1,120°C,
hardened in salt bath
Tempering resistance

Specimens: bar steel ∅ 100 mm x 60 mm Length

Tempering resistance diagram of DRM2 Matrix high-speed steel in ESR quality The diagram shows the tempering resistance of DRM2 Matrix high-speed steel in ESR quality. ≈ gehärtet &\nangelassen 70 65 60 55 50 45 40 35 30 1 10 Holding time at 65°C (h) hardness [HRC] DRM2 conv. Matrix-HSS
Heat treatment
Hardening
DRM2 1,120°C,
hardened in salt bath
Härteverfahren
Salt bath
Hardening process in salt bath for DRM2 Matrix high-speed steel in ESR quality Diagram of the recommended hardening process in salt bath for DRM2 Matrix high-speed steel in ESR quality. The process includes preheating stages, austenitizing, quenching and tempering. 1,200 1,100 1,000 900 800 700 600 500 400 300 200 100 20 30min. 10min. 20min. 5-10min. 2-3h 2-3h Time 1,100°C 1,050°C 830°C 500°C 550°C - 620°C 550°C - 620°C achievable hardness 58 - 62 HRC Luft-\nabkühlung Luft-\nabkühlung Temperature [°C] 30 - 40 30 - 40 20 - 25 16 - 20 10 - 16 8 - 10 above 100 to 100 to 60 to 37,5 to 25 to 12 Holding times[min.] Thickness[mm] recommended holding times Transformation temperatures: AC1 = 830°C; Ms = 175°C recommended hardening temperature DRM2 = 1,050 - 1,120°C
Vacuum
Hardening process in vacuum for DRM2 Matrix high-speed steel in ESR quality Diagram of the recommended hardening process in vacuum furnace for DRM2 Matrix high-speed steel in ESR quality. 1,200 1,100 1,000 900 800 700 600 500 400 300 200 100 20 Temperature [°C] 30min. 30-90min. 2-3h Time 950°C 1100°C 550°C - 620°C 550°C - 620°C achievable hardness 58 - 62 HRC Luft-\nabkühlung Luft-\nabkühlung Gas quenchingmin. 6 bar 2-3h recommended holding times Thickness[mm] Holding times[min.] to 60 to 100and above 20 - 30per 25mmThickness 10 - 20per 25mmThickness Transformation temperatures: AC1 = 830°C; Ms = 175°C recommended hardening temperature DRM2 = 1,050 - 1,120°C
Salt bath
Mobile diagram of the recommended hardening process in salt bath for DRM2 Matrix high-speed steel in ESR quality Simplified diagram of the recommended hardening process in salt bath. 1,200 100 20 Time 1,100°C 1,050°C 830°C 550°C - 620°C 550°C - 620°C achievable hardness 58 - 62 HRC Temperature [°C] 500°C Luft-\nabkühlung- Luft-\nabkühlung- 30min. 10min. 20min. 5-10min. 2-3h 2-3h

Transformation temperatures AC1= 830°C; Ms = 175°C
recommended hardening temperature DRM2 = 1,050 - 1,120°C

recommended holding times
Thickness
[mm]		Holding times
[min.]
to 128 - 10
to 2510 - 16
to 37,516 - 20
to 6020 - 25
to 10030 - 40
above 10030 - 40
Vacuum
Mobile diagram of the recommended hardening process in vacuum for DRM2 Matrix high-speed steel in ESR quality Simplified diagram of the recommended hardening process in vacuum furnace. 1,200 100 20 Temperature [°C] Time 950°C 1,100°C 550°C - 620°C 550°C - 620°C achievable hardness 58 - 62 HRC Luft-\nabkühlung Luft-\nabkühlung Gas quenching mind. 6 bar 2-3h 30min. 30-90min. 2-3h

Transformation temperatures AC1= 830°C; Ms = 175°C
recommended hardening temperature DRM2 = 1,050 - 1,120°C

recommended holding times
Thickness
[mm]		Holding times
[min.]
to 6020 - 30
per 25 mm
Thickness
to 100
and above		10 - 20
per 25 mm
Thickness
Nitriding
Nitriding

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

Hardness distribution after nitriding
Hardness distribution of DRM2 Matrix high-speed steel in ESR quality after nitriding The diagram shows the hardness distribution (HV) as a function of distance from surface (mm) after nitriding of steel DRM2 Matrix high-speed steel in ESR quality. Hardness distribution 0 0.2 0.4 0.6 0.8 1 1.2 hardness (HV 0,1) Distance from surface [mm] 1,400 1,200 1,000 800 600 400 200 0

The surface hardness reaches here 1.250 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.

Material info

Available products made of this grade:

Downloads

Daido DRM2

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