Steel Glossary
Daido DRM3
C | Si | Mn | Cr | Mo | W | V | |
---|---|---|---|---|---|---|---|
Typical Composition (Weight %) | 0.8 | 0.7 | 0.3 | 5.4 | 4.5 | 1.0 | 1.2 |
Treatment Temperatures | Hardness | ||||
---|---|---|---|---|---|
Hot Forming | Annealing | Hardening | Tempering | Soft Annealing | Hardened |
(please inquire) | 800 - 880°C Slow cooling (≤ 20°C/min) |
1,100 - 1,140°C Quenching in oil, gas, or salt bath |
550 - 620°C Minimum 2x tempering, air-cooling |
≤ 235 HB | 62 - 66 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 | ||
11.1 | 11.5 | 11.9 | 12.2 | 12.4 | 12.7 | |||
Thermal Conductivity [W/mK] | 25°C | 200°C | 300°C | 400°C | 500°C | 600°C | ||
18 | 21.5 | 23.1 | 24.4 | 25.2 | 26.0 | |||
Specific Heat [J/kgK] | 25°C | 200°C | 300°C | 400°C | 500°C | 600°C | ||
424 | 480 | 520 | 560 | 698 | 830 |
E-Modul = 210 GPa, The Sample Was Hardened At 1,140°C And Tempered Twice At 560°C
Microstructure
DRM3
(In The Center Of The Bar, Diameter 100 mm)
![Microstructure - DRM3 Microstructure - DRM3](/img/stahllexikon/DRM3-Mikrostruktur.jpg)
Conventional Hot Work Steel
(Daido)
![Microstructure Conventional Hot Working Steel Microstructure Conventional Hot Working Steel](/img/stahllexikon/DRM3-Daido-Mikrostruktur.jpg)
Tempering Treatment
Sample: Square 15 mm, quenched in oil, tempered with air cooling
![Tempering Treatment - DRM3 Tempering Treatment - DRM3](/img/stahllexikon/DRM3-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 - DRM3 Charpy Impact Toughness - DRM3](/img/stahllexikon/DRM3-Kerbschlagzaehigkeit.png)
Heat Treatment | ||
---|---|---|
Hardening | Tempering | |
DRM3 | 1,140°C, oil quenching | 540 - 600°C, double tempering |
1.3343 | 1,210°C, oil quenching | 540 - 600°C, double tempering |
Hardness at Elevated Temperatures
![Hardness at Elevated Temperatures - DRM3 Hardness at Elevated Temperatures - DRM3](/img/stahllexikon/DRM3-Haerte-Erhoehte-Temperaturen.png)
Heat Treatment | ||
---|---|---|
Hardening | Tempering | |
DRM3 | 1,140°C, oil quenching | 560°C, double tempering |
1.3343 | 1,200°C, oil quenching | 580°C, double tempering |
Crack Resistance To Burning
Sample: ∅ 15 mm, 10 mm thick
![Crack resistance to burning - DRM3 Crack resistance to burning - DRM3](/img/stahllexikon/DRM3-Brandrissbestaendigkeit.png)
Heat Treatment | ||
---|---|---|
Hardening | Tempering | |
DRM3 | 1,120°C, oil quenching | 560 - 620°C, double tempering |
1.3343 | 1,200°C, oil quenching | 560°C, double tempering |
Test method | Inductive heating 1,000 times to 600°C and cooling to 20°C |
Fatigue Strength / Material Fatigue
Specimens: taken from the center of a rod with ∅ 100 mm
![Dauerfestigkeit / Materialermüdung - DRM3 Dauerfestigkeit / Materialermüdung - DRM3](/img/stahllexikon/DRM3-Dauerfestigkeit-Materialermuedung.png)
Fatigue Strength / Material Fatigue
Test Specimens: taken from the center of a rod with diameter ∅ 100 mm
Heat Treatment | ||
---|---|---|
Hardening | Tempering | |
DRM3 (65 HRC) | 1,100°C, oil quenching | 560°C, double tempering |
DRM3 (67 HRC) | 1,140°C, oil quenching | 550°C, double tempering |
1.3343 | 1,140°C, oil quenching | 560°C, double tempering |
Test Method | Wöhler Test at room temperature |
Dimensional Changes during Hardening
Test Specimens: Rod steel ∅ 100 mm x 60 mm length
![Dimensionsänderung beim Härten - DRM3 Dimensionsänderung beim Härten - DRM3](/img/stahllexikon/DRM3-Dimensionsaenderung-Haerten.png)
Heat Treatment | |
---|---|
Hardening | |
DRM3 | 1,140°C, hardened in salt bath |
Hardenability
Influence of Cooling Rate on Bending Strength
![Hardenability - DRM3 Hardenability - DRM3](/img/stahllexikon/DRM3-Haertbarkeit.png)
Continuous Cooling Transformation Diagram
![TTT Diagramm - DRM3 TTT Diagramm - DRM3](/img/stahllexikon/DRM3-ZTU.png)
Hardening Process
Salt Bath
![Hardening Process: Salt Bath - DRM3 Hardening Process: Salt Bath - DRM3](/img/stahllexikon/DRM3-Haerteverfahren-Salzbad.png)
Vacuum
![Hardening Process: Vacuum - DRM3 Hardening Process: Vacuum - DRM3](/img/stahllexikon/DRM3-Haerteverfahren-Vakuum.png)
Umwandlungstemperaturen:
AC1 = 830°C, Ms = 175°C>
The Hardening Temperature of DRM3 is at 1,100 – 1,140°C
Salt Bath | Vacuum | |
---|---|---|
Thickness [mm] | Holding Times [min] | Holding Times [min] |
to 12 | 8 - 10 | 20 - 30 pro 25 mm Thickness |
to 25 | 10 - 15 | |
to 36 | 15 - 20 | |
to 50 | 20 - 25 | |
to 100 | 30 - 40 | 10 - 20 pro 25 mm Thickness |
over 100 | 30 - 40 |
Nitriding
![Nitriding - DRM3 Nitriding - DRM3](/img/stahllexikon/DRM3-Nitrieren.jpg)
Example of the microstructure of a nitrided surface using the PS process by Daido Amistar.
Hardness Profile After Nitriding
![Hardness profile after nitriding - DRM3 Hardness profile after nitriding - DRM3](/img/stahllexikon/DRM3-Haerteverlauf-Nitrieren.png)
The surface hardness reaches 1,280 HV with NHD = 0.2 mm.
Representative technical values are always given based on our investigations. If not stated otherwise, they do not constitute guarantees. Please seek individual advice if needed.
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