Steel Glossary
Daido DRM2
| C | Si | Mn | Cr | Mo | W | V | Co | |
|---|---|---|---|---|---|---|---|---|
| Typical Composition (Weight %) | 0.6 | 0.3 | 0.5 | 5.5 | 2.4 | 1.0 | 1.0 | 0.15 |
| Treatment Temperatures | Hardness | ||||
|---|---|---|---|---|---|
| Warm 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 Minimum 2x tempering, air-cooling |
≤ 235 HBW | 58 - 62 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 |
| 11.0 | 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 | |
| 26.9 | 23.2 | 27.9 | 29.0 | 28.8 | 29.2 | 29.6 | ||
| Specific Heat [J/kgK] | 25°C | 200°C | 300°C | 400°C | 500°C | 600°C | ||
| 458 | 518 | 555 | 598 | 659 | 756 | 910 | ||
E-Modul = 210 GPa, The Sample Was Hardened At 1,140°C And Tempered Twice At 560°C
Microstructure
DRM2
(In The Center Of The Bar, Diameter 100 mm)
Microscopic image: Optimized matrix structure of high-speed steel DRM2 in the center of a 100mm bar
Conventional Hot Work Steel
(Daido)
Microscopic image: Microstructure of conventional high-speed steel from Daido with typical carbide distribution
Tempering Treatment
Sample: Square 15 mm, quenched in oil, tempered with air cooling
Technical diagram: Tempering treatment of 15mm square sample after oil quenching with air cooling
Charpy Impact Toughness
Samples: taken from round bar, in the center of the diameter 100 mm, notched U-shaped specimen
Technical diagram: Impact toughness measured on U-notched specimens from the center of a 100mm round bar
| Heat Treatment | ||
|---|---|---|
| Hardening | Tempering | |
| DRM2 | 1,120°C, oil quenched | 540 - 600°C, twice tempered |
| conventional steel | 1,120°C, oil quenched | 540 - 600°C, twice tempered |
Crack Resistance To Burning
Technical diagram: Impact toughness measured on U-notched specimens from the center of a 100mm round bar
| Heat Treatment | ||
|---|---|---|
| Hardening | Tempering | |
| DRM2 | 1,140°C, oil quenched | 560°C, twice tempered |
| Conventional Steel | 1,200°C, oil quenched | 580°C, twice tempered |
Fatigue Strength / Material Fatigue
Specimens: taken from the center of a rod with ∅ 100 mm
Technical diagram: Fatigue strength and material fatigue in Wöhler test at room temperature
| Heat Treatment | ||
|---|---|---|
| Hardening | Tempering | |
| DRM2 (65 HRC) | 1,120°C, oil quenched | 560°C, twice tempered |
| conventional steel | 1,140°C, oil quenched | 560°C, twice tempered |
| Test Method | Wöhler test at room temperature | |
Hardenability
Influence of the cooling rate on the bending strength
Technical diagram: Change in equivalent diameter with 6 bar gas quenching
| Heat Treatment | ||
|---|---|---|
| Hardening | Tempering | |
| DRM2 | 1,120°C, 200°C/min according to oil hardening | 560°C, twice tempered |
Dimensions change during hardening
Samples: Round steel ∅ 100 mm x 60 mm length
Technical diagram: Dimensional changes in 100mm x 60mm round steel samples during hardening
| Heat Treatment | |
|---|---|
| Hardening | |
| DRM2 | 1.120°C, in salt bath hardened |
Hardening Process
Salt Bath
Technical diagram: Optimal parameters for salt bath hardening
| Salt Bath | |
|---|---|
| Thickness [mm] | Holding times [min] |
| up to 12 | 8 - 10 |
| up to 25 | 10 - 16 |
| up to 37,5 | 16 - 20 |
| up to 60 | 20 - 25 |
| up to 100 | 30 - 40 |
| over 100 | 30 - 40 |
Vacuum
Technical diagram: Optimal parameters for vacuum hardening
Transformation temperatures:
AC1 = 830°C, Ms = 175°C
The hardening temperature of DRM2 is 1.100 – 1.140°C
| Vacuum | |
|---|---|
| Thickness [mm] | Holding times [min] |
| up to 60 | 20 - 30 per 25 mm thickness |
| over 100 | 10 - 20 per 25 mm thickness |
Nitriding
Example of the microstructure of a nitrided surface after the PS method from Daido Amistar.
Hardness profile after nitriding
The surface hardness reaches 1.250 HV with NHD = 0,2 mm.
Given are always representative technical values based on our investigations. They do not constitute any warranties if not stated otherwise. Please consult us for individual cases.
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