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. 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. 

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:

1. Soft Annealing: Heat to 680-720oC, cool slowly. This will produce a maximum Brinell hardness of 248.
2. Nitriding:
3. Gas/plasma nitriding temperature (gas, salt bath): 570-580oC
4. Gas/plasma nitriding temperature (powder, plasma): 580oC
5. Surface hardness after nitriding: 800 HV
6. 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