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Mat.No. 1.7220, DIN 34CrMo4, AISI 4135/4137
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Designation by Standards Brand Name Ravne No. Mat. No. DIN EN AISI VCMO135 723 1.7220 34CrMo4 - 4135/4137 Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.34 max. 0.40 0.75 1.05 0.23 - - - - DescriptionStructural alloyed carbon steel. ApplicationsStatically and dynamically stressed components for vehicles, engines and machines – axles, turbine components, chains, forgings, etc. Physical properties (avarage values) at ambient temperatureModulus of el...
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Designation by Standards
| Brand Name | Ravne No. | Mat. No. | DIN | EN | AISI |
| VCMO135 | 723 | 1.7220 | 34CrMo4 | - | 4135/4137 |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.34 | max. 0.40 | 0.75 | 1.05 | 0.23 | - | - | - | - |
Description
Structural alloyed carbon steel.
Applications
Statically and dynamically stressed components for vehicles, engines and machines – axles, turbine components, chains, forgings, etc.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.86
Thermal conductivity [W/m.K]: 41.9
Specific heat capacity[J/g.K]: 0.46
Continuous Cooling Transformation (CCT) Diagram
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Soft Annealing
Heat to 680-720oC, cool slowly. This will produce a maximum Brinell hardness of 223.
Noramlizing
Temperature: 850-890oC.
Hardening
Harden from a temperature of 830-890oC followed by oil or water quenching.
Tempering
Tempering temperature: 540-680oC.
Mechanical Properties in Hardening and Tempering Condition
| Diameter (mm) | 0.2 % proof stress (N/mm2) | Tensile strength (N/mm2) | Elongation (%) | Reduction of area (%) | Notch impact energy (ISO-V) (J) |
| up to 16 | 785 | 980-1180 | 11 | 45 | 41 |
| 17-40 | 665 | 880-1080 | 12 | 50 | 48 |
| 41-100 | 560 | 780-930 | 14 | 55 | 48 |
| 101-160 | 510 | 740-890 | 15 | 60 | 48 |
| 161-250 | 460 | 690-840 | 15 | 60 | 48 |
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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