Designation by Standards
|
Brand Name |
Ravne No. |
Mat. No. |
DIN |
EN |
AISI |
|
VCMO150 |
725 |
1.7228 |
50CrMo4 |
50CrMo4 |
4150 |
Chemical Composition in Weight %
|
C |
Si |
Mn |
Cr |
Mo |
Ni |
V |
W |
Others |
|
0.50 |
max. 0.40 |
0.65 |
1.05 |
0.23 |
- |
- |
- |
- |
Description
This is a higher carbon variation of the chromium, manganese, molybdenum 4100 series of low alloy steels.
Applications
Statically and dynamically stressed components for vehicles, engines and machines, for parts of larger cross-sections. Components for driving gears, axles, rolls, rings. |
Physical properties (avarage values) at ambient temperature:
Modulus of elasticity [103 x N/mm2]: 190-210
Density [g/cm3]: 7.84
Continuous Cooling Transformation (CCT) Diagram
Time-Temperature Transformation (TTT) Diagram
|
Soft Annealing
Heat to 680-720 'C, cool slowly in furnace. This will produce a maximum Brinell hardness of 248.
Hardening
Hardening: 820-850, 830-860 'C, water, oil.
Normalizing
Normalizing: 840-860 'C
Tempering
Tempering temperature: 540-680 'C
Hardness after heat treatmnet
Aannealed at 815 'C: 197 HB
Normalized at 870 'C: 321 HB
Oil quenched, fine grained, tempered at 205 'C: 530 HB
Oil quenched, fine grained, tempered at 315 'C: 495 HB
Oil quenched, fine grained, tempered at 425 'C: 440 HB
Oil quenched, fine grained, tempered at 540 'C: 370 HB
Oil quenched, fine grained, tempered at 650 'C: 290 HB
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 |
900 |
1100-1300 |
9 |
40 |
35 |
|
17-40 |
780 |
1000-1200 |
10 |
45 |
35 |
|
41-100 |
700 |
900-1100 |
12 |
50 |
35 |
|
101-160 |
650 |
850-1000 |
13 |
50 |
35 |
|
161-250 |
550 |
800-950 |
13 |
50 |
35 |
Steel Properties vs. Temperature
|
Forging
Hot forming temperature: 1050-850 'C.
Machinability
Machinability of 4150 is good in the annealed condition, or in the normalized condition. After heat treatment the alloy can be very hard and it is best to limit machining at that point to grinding.
