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30CRMOV9 / 1.7707 ALLOY STEEL
30CrMoV9 is a steel which in general is intended for the fabrication of quenched and tempered parts, which are generally machined and subsequently nitrided.
Key words:
30CRMOV9 / 1.7707 ALLOY STEEL
Classification:
Description
Product introduction
30CrMoV9 is a steel which in general is intended for the fabrication of quenched and tempered parts, which are generally machined and subsequently nitrided. The alloy 30CrMoV9 is usually produced by EAF /VD /LF followed by electroslag refining (ESR) if necessary for special purpose. Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different level according to the buyers’ requirements. Bars are usually supplied bright in the annealed condition, or bright annealing specially.
Technical data
CHEMICAL COMPOSITION OF 30CRMOV9
| C | Mn | Si | P | S | Cr | Ni | Mo | V |
| 0.26-0.34 | 0.40-0.70 | 0.40 max | 0.035 max | 0.035 max | 2.30-2.70 | 0.60 max | 0.15-0.25 | 0.10-0.20 |
MECHANICAL PROPERTIES OF 30CRMOV9
| Process | Diameter(mm) | Tensile Strength Rm (Mpa) | Yield Strength Rp0.2 (Mpa) | Elongation A5 (%) | Impact Value Kv (J) Room Temperature |
| QUENCHED AND TEMPERED | 160 max | 900 min | 700 min | 12 min | 35 min |
| QUENCHED AND TEMPERED | 160-330 | 800 min | 590 min | 14 min | 35 min |
PHYSICAL PROPERTIES OF 30CRMOV9
| Youngs module (GPa) | Poisson´s ratio (-) | Shear module (GPa) | Density (kg/m3) |
| 210 | 0.3 | 80 | 7800 |
| Average CTE 20-300°C (µm/m°K) | Specific heat capacity 50/100°C (J/kg°K) | Thermal conductivity Ambient temperature (W/m°K) | Electrical resistivityAmbient temperature (µΩm) |
| 12 | 460 - 480 | 40 - 45 | 0.20 - 0.25 |
HEAT TREATMENT OF 30CRMOV9:
- Soft Annealing: Heat to 680-720oC, cool slowly. This will produce a maximum Brinell hardness of 248.
- Nitriding:
- Gas/plasma nitriding temperature (gas, salt bath): 570-580oC
- Gas/plasma nitriding temperature (powder, plasma): 580oC
- Surface hardness after nitriding: 800 HV
- Hardening:Harden from a temperature of 850-880oC followed by oil quenching.
TEMPERING OF 30CRMOV9:
- Tempering temperature: 570-680oC.
FORGING OF 30CRMOV9:
- Hot forming temperature: 1050-850oC.
AVAILABLE SHAPES :
- Black bar /Flat bar / Square bar /Pipe, /Steel strip, /sheet
- Bright – peeled + polishing, centerless grinding
- Forged – ring, tube, pipe casing, discs, shaft
TYPICAL APPLICATIONS OF 30CRMOV9:
Alloy structural steels are widely used in the filed of ship, vehicle, airplane, guided missile, weapons, railway, bridges, pressure vessel, machine tools, mechanical components with a bigger sectional size and so on., Mechanical gears, gear shaft, main axis, valve rod, Mechanical parts – connecting rod, bolt and nut, Multidiameter shaft, Pressure vessel, seamless pipe
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