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Mat.No. 1.8550, DIN 34CrAlNi7
Short Description:
Designation by Standards Brand Name Ravne No. Mat. No. DIN EN AISI PO731 731 1.8550 34CrAlNi7 - - Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.34 max. 0.40 0.55 1.65 0.20 1.00 - - Al=1.00 DescriptionAl-alloyed nitriding steel grade for large-sections. ApplicationsStructural parts with high surface hardness – piston rods, extruders, cylinders, shafts, straightening tools, measuring tools, etc. Physical properties (avarage values) at ambient tempe...
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Designation by Standards
| Brand Name | Ravne No. | Mat. No. | DIN | EN | AISI |
| PO731 | 731 | 1.8550 | 34CrAlNi7 | - | - |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.34 | max. 0.40 | 0.55 | 1.65 | 0.20 | 1.00 | - | - | Al=1.00 |
Description
Al-alloyed nitriding steel grade for large-sections.
Applications
Structural parts with high surface hardness – piston rods, extruders, cylinders, shafts, straightening tools, measuring tools, etc.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.73
Coefficient of Linear Thermal Expansion 10-6 oC-1
| -191 to +16oC | 20-100oC | 20-200oC | 20-300oC | 20-400oC | 20-500oC |
| 9.1 | 11.1 | 12.1 | 12.9 | 13.5 | 13.9 |
Continuous Cooling Transformation (CCT) Diagram
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Time-Temperature Transformation (TTT) Diagram
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Soft Annealing
Heat to 650-700oC, cool slowly. This will produce a maximum Brinell hardness of 248.
Hardening
Harden from a temperature of 850-900oC followed by oil quenching.
Tempering
Tempering temperature: 570-660oC.
Nitriding
Temperature: 480-570oC.
Surface hardness after nitriding: 950 HV
Mechanical Properties in Quenched and Tempered Condition
| Diameter (mm) | 0.2 proof stress (N/mm2) | Tensile stregth (N/mm2) | Elongation (%) | Reduction (%) | Notch impact energy (ISO-V) (J) |
| 16-40 | 680 | 900-1100 | 10 | - | 30 |
| 41-100 | 650 | 850-1050 | 12 | - | 30 |
| 101-160 | 600 | 800-1000 | 13 | - | 35 |
| 161-250 | 600 | 800-1000 | 13 | - | 35 |
Diagram Tempering Temperature – Mechanical Properties
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Forging
Hot forming temperature: 1050-850oC.
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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