Steel Glossary
Daido DRM1
| C | Si | Mn | Cr | Mo | W | V | Co | |
|---|---|---|---|---|---|---|---|---|
| Typical Composition (Weight %) | 0.5 | 0.2 | 0.5 | 4.2 | 1.0 | 3.0 | 1.3 | 2.0 |
| Treatment Temperatures | Hardness | ||||
|---|---|---|---|---|---|
| Hot Forming | Annealing | Hardening | Tempering | Soft Annealing | Hardened |
| (please inquire) | 800 - 880°C Slow cooling |
1,100 - 1,140°C Quenching in oil, gas, or salt bath |
550 - 620°C Minimum 2x tempering, air-cooling |
≤ 235 HB | 56 – 58 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 |
| 11.2 | 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 | |
| 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 | |
| 413 | 487 | 519 | 562 | 616 | 705 | 840 | ||
E-Modul = 210 GPa, The Sample Was Hardened At 1,140°C And Tempered Twice At 560°C
Microstructure
DRM1
(In The Center Of The Bar, Diameter 100 mm)
Conventional Hot Work Steel
(Daido)
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 | |
| DRM1 | 1,140°C, oil quenched | 540 - 600°C, double tempered |
| Conventional Steel | 1,120°C, oil quenched | 540 - 600°C, double tempered |
Time-dependent tempering resistance
| Heat Treatment | ||
|---|---|---|
| Hardening | Tempering | |
| DRM1 | 1,140°C, oil quenched | 600°C, double tempered |
| Conventional Steel | 1,120°C, oil quenched | 610°C, double tempered |
Hardness at Elevated Temperatures
| Heat Treatment | ||
|---|---|---|
| Hardening | Tempering | |
| DRM1 | 1,140°C, oil quenched | 560°C, double tempered |
| Conventional Steel | 1,140°C, oil quenched | 560°C, double tempered |
Fire Crack Resistance
Sample: ∅ 15 mm, 10 mm thick
| Heat Treatment | ||
|---|---|---|
| Hardening | Tempering | |
| DRM1 | 1,140°C, oil quenched | 560°C, double tempered |
| Conventional Steel | 1,140°C, oil quenched | 560°C, double tempered |
| Test Method | Induction heating to 700°C, cooling to 20°C, repeated 1,000 times | |
Endurance Strength / Material Fatigue
Samples: taken from the center of a bar ∅ 100 mm
| Heat Treatment | ||
|---|---|---|
| Hardening | Tempering | |
| DRM1 | 1,140°C, oil quenched | 560°C, double tempered |
| Konventional Steel | 1,140°C, oil quenched | 560°C, double tempered |
| Test Method | Wöhler bending Test at room temperature | |
Hardenability
Sample: Round steel ∅ 100 mm
| Wärmebehandlung | ||
|---|---|---|
| Härten | Anlassen | |
| DRM1 | 1,140°C, 200°C/min entsprechend Ölhärtung | 560°C, zweifach angelassen |
Dimensional Changes During Hardening
Specimens: Rod steel ∅ 100 mm x 60 mm length
| Heat Treatment | |
|---|---|
| Hardening | |
| DRM1 | 1,140°C, oil quenched |
Hardness processes
Salt bath
Vacuum
Nitriding
Example of the microstructure of a nitrided surface using Daido Amistar's PS process.
Hardness profile after nitriding.
The surface hardness reaches 1,200 HV with NHD = 0.2 mm.
Representative technical values are provided based on our investigations. Unless otherwise stated, they do not constitute guarantees. Please seek individual advice for specific cases.
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