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)
![Microstructure - DRM1 Microstructure - DRM1](/img/stahllexikon/DRM1-Mikrostruktur.jpg)
Conventional Hot Work Steel
(Daido)
![Microstructure Conventional Hot Working Steel Microstructure Conventional Hot Working Steel](/img/stahllexikon/Daido-Mikrostruktur.jpg)
Tempering Treatment
Sample: Square 15 mm, quenched in oil, tempered with air cooling
![Tempering Treatment - DRM1 Tempering Treatment - DRM1](/img/stahllexikon/DRM1-Anlassbehandlung.png)
Charpy Impact Toughness
Samples: taken from round bar, in the center of the diameter 100 mm, notched U-shaped specimen
![Charpy Impact Toughness - DRM1 Charpy Impact Toughness - DRM1](/img/stahllexikon/DRM1-Kerbschlagzaehigkeit.png)
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
![Time-dependent tempering resistance - DRM1 Time-dependent tempering resistance - DRM1](/img/stahllexikon/DRM1-Anlassbestaendigkeit-Zeit.png)
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
![Hardness at elevated temperatures - DRM1 Hardness at elevated temperatures - DRM1](/img/stahllexikon/DRM1-Haerte-Erhoehte-Temperaturen.png)
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
![Crack resistance to burning - DRM1 Crack resistance to burning - DRM1](/img/stahllexikon/DRM1-Brandrissbestaendigkeit.png)
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
![Endurance strength / Material fatigue - DRM1 Endurance strength / Material fatigue - DRM1](/img/stahllexikon/DRM1-Dauerfestigkeit-Materialermuedung.png)
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
![Hardenability - DRM1 Hardenability - DRM1](/img/stahllexikon/DRM1-Haertbarkeit-Anlasshaerte.png)
![Hardenability - DRM1 Hardenability - DRM1](/img/stahllexikon/DRM1-Haertbarkeit-Kerbschlagzaehigkeit.png)
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
![Dimensional changes during hardening - DRM1 Dimensional changes during hardening - DRM1](/img/stahllexikon/DRM1-Dimensionsaenderung-Haerten.png)
Heat Treatment | |
---|---|
Hardening | |
DRM1 | 1,140°C, oil quenched |
Hardness processes
Salt bath
![Hardening Process: Salt Bath Hardening - DRM1 Hardening Process: Salt Bath Hardening - DRM1](/img/stahllexikon/DRM1-Haerteverfahren-Salzbad.png)
Vacuum
![Hardening Process: Vacuum Hardening - DRM1 Hardening Process: Vacuum Hardening - DRM1](/img/stahllexikon/DRM1-Haerteverfahren-Vakuum.png)
Nitriding
![Nitriding - DRM1 Nitriding - DRM1](/img/stahllexikon/DRM1-Nitrieren.jpg)
Example of the microstructure of a nitrided surface using Daido Amistar's PS process.
Hardness profile after nitriding.
![The hardness profile after Nitriding - DRM1 The hardness profile after Nitriding - DRM1](/img/stahllexikon/DRM1-Haerteverlauf-Nitrieren.png)
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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