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Mat.No. 1.8515, DIN 31CrMo12
Short Description:
Designation by Standards Brand Name Ravne No. Mat. No. DIN EN AISI 32CRMO12 785 1.8515 31CrMo12 31CrMn2 - Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.31 max. 0.40 0.55 3.05 0.40 max. 0.30 - - - DescriptionAl-free nitriding steel for relatively large cross sections, and also for higher nitriding hardness as a result of its chemical composition. ApplicationsSuitable for gear wheels, cylinders, drills, connecting rods, shafts, extruders, quides, thread gauges...
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Designation by Standards
| Brand Name | Ravne No. | Mat. No. | DIN | EN | AISI |
| 32CRMO12 | 785 | 1.8515 | 31CrMo12 | 31CrMn2 | - |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.31 | max. 0.40 | 0.55 | 3.05 | 0.40 | max. 0.30 | - | - | - |
Description
Al-free nitriding steel for relatively large cross sections, and also for higher nitriding hardness as a result of its chemical composition.
Applications
Suitable for gear wheels, cylinders, drills, connecting rods, shafts, extruders, quides, thread gauges with relatively large-cross section.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.80
Mecahnical Properties in Quenched and Tempered Condition
| Diameter in mm | 0.2 proof stress (N/mm2) | Tesnsile strength (N/mm2) | Elongation, min. (%) | Reduction, min. (%) | Notch impact energy (J) |
| 16-40 | 835 | 1030-1230 | 10 | - | 25 |
| 41-100 | 785 | 980-1180 | 11 | - | 30 |
| 101-160 | 735 | 930-1130 | 12 | - | 30 |
| 161-250 | 675 | 880-1080 | 12 | - | 30 |
Soft Annealing
Heat to 650-700oC, cool slowly. This will produce a maximum Brinell hardness of 248.
Hardening
Harden from a temperature of 870-910oC followed by oil quenching. Hardness after quenching is 64-66 HRC.
Nitriding
Temperature: 480-570oC. Hardness after nitridng is 480-570 HV1.
Tempering
Tempering temperature: 520-570oC.
Tempering Temperature (oC) vs. Hardness (HRC)
| 100oC | 200oC | 300oC | 400oC | 500oC | 600oC |
| 64 | 62 | 60 | 57 | 53 | 42 |
Diagram Tempering Temperature – Mechanical Properties
Click the image to enlarge the diagram.
Forging
Hot forming temperature: 1100-900oC.
Machinability
No data.
Forms manufactured: Please see the Dimensional Sales Program.
Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.
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