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Mat.No. 1.7707, DIN 30CrMoV9, AISI 4340
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Designation by Standards Brand Name Ravne No. Mat. No. DIN EN AISI VCMO230 726 1.7707 30CrMoV9 - 4340 Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.30 max. 0.40 0.55 2.50 0.20 - 0.15 - - DescriptionAlloyed tool steel. ApplicationsStructural parts of medium and large cross sections and high surface hardness, e.g., valve and gate valves, cylinders for combustion engines, superheated steam valves and fittings. Physical properties (avarage values) at ambie...
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Designation by Standards
| Brand Name | Ravne No. | Mat. No. | DIN | EN | AISI |
| VCMO230 | 726 | 1.7707 | 30CrMoV9 | - | 4340 |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.30 | max. 0.40 | 0.55 | 2.50 | 0.20 | - | 0.15 | - | - |
Description
Alloyed tool steel.
Applications
Structural parts of medium and large cross sections and high surface hardness, e.g., valve and gate valves, cylinders for combustion engines, superheated steam valves and fittings.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Continuous Cooling Transformation (CCT) Diagram
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Time-Temperature Transformation (TTT) Diagram
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Soft Annealing
Heat to 680-720oC, cool slowly. This will produce a maximum Brinell hardness of 248.
Hardening
Harden from a temperature of 850-880oC followed by oil quenching.
Tempering
Tempering temperature: 570-680oC.
Nitriding
Gas/plasma nitriding temperature (gas, salt bath): 570-580oC
Gas/plasma nitriding temperature (powder, plasma): 580oC
Surface hardness after nitriding: 800 HV
Mechanical Properties in Hardening and Tempering Condition
| Diameter (mm) | 0.2 % proof stress (N/mm2) | Tensile strength (N/mm2) | Elongation (%) | Reduction of area (%) |
| <100 | 800 | 1000-1200 | 11 | 40 |
| 101-250 | 700 | 900-1100 | 12 | 50 |
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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