European Steel Heat Treat

[Osprey Guy]

There's a new member from Turkey over in Newbies who's trying to find heat treat recommendations for a steel we don't see in the USA. I figured maybe this forum might be better suited for the question. Here's a copy of his post and available specs. Anyone got any ideas?

Dennis



can anyone look at these and find clues of heat treating a knife of this steel?

50crv4
Category Type Functional unit
Metals ferro Steel (high grade) kg

--------------------------------------------------------------------------------

Property Min Max Unit
Price
Young's modulus 210000 210000 MPa
Shear modulus
Tensile strength 1100 1300 MPa
Elongation 10 10 %
Compressive strength
Creep strength
Fatigue
Bending strength
Hardness 57 62 Rockwell
Impact strength
Yield strength 900 900 MPa
Thermal expansion 12.3 12.3 e-6/K
Thermal conductivity 50 50 W/m.K
Specific heat 500 500 J/kg.K
Melting temperature 1540 1540 ?C
Glass temperature
Service temperature
Density 7830 7830 kg/m?
Resistivity 0.23 0.23 Ohm.mm?/m
Breakdown potential
Electrochemical potential -0.45 -0.45 V
Dielectric loss factor
Friction coefficient
Refraction index
Thickness
Shrinkage
Water absorption

Remarks
(Fe rest, C 0.47-0.55, Cr 0.80-1.20,V 0.07-0.20, Si 0.17-0.37, Mn 0.50-0.80, S <0.040, P <0.040 (wt.%))



50CRV4 - This is a steel with very small amounts of Vandium and Chromium. Chromium in higher quantities lends to a steel's "stainless" properties. However, in 50CRV, there isn't enough to make it "stainless" - and metallurgically brittle. Thus it makes a good spring steel. It contains trace amounts of Silicon and Manganese. The tensile strength is equeled to CK55 and CK50 is about 600 N/mm2, while 50CRV4 ranks about 750 N/mm2.

[Jerry Hossom]

Maybe one if the smiths will join in here, but the formula is pretty simple. It looks a lot like 6150. (0.5% C, 0.8% Mn, 0.3% Si, 1.0% Cr, 0.15%V)

Schedule for 6150 is harden at 1550-1650F. Oil quench and temper for 2 hours at 400F for Rc55.

[mark23]

Hi, the following data is from the "Key to steel". All temperatures given ?C (degree Celsius).

1.2241 (51CrV4)

Hot forming temperature: 850-1050?C
Soft annealing: 670-710?C
Hardening: 820-850?C, quench in oil
Tempering: 180-300?C

Hardness: (HRC)
Hardened 56 HRC
Tempered@...
... 100?C 56 HRC
... 200?C 54 HRC
... 300?C 51 HRC
... 400?C 47 HRC

It is a steel commonly used for screw#######.

Regards

Mark23

[Jerry Hossom]

Is there a difference between 50CrV4 and 51CrV4? I assume there is. Typo?

[mark23]

The difference is marginal. The numbers "50" resp. "51" only provide information about the carbon content of the steel.

I don't think there is a difference. I chose data of the "tool steel" 1.2241, there is also a structural steel (1.8something) with the same alloy, but I do not have additional information on that at the moment.

Sorry.

Regards

Mark23

[hayly]

1.8159 is 50CrV4, a spring Steel i think 1.2241 (51CrV4) is a tool steel. Anyway the temperatures are correct for both.