1.Chemical Composition (%):
|
Grade
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Mo
|
|
42CrMo4
|
0.38-0.45
|
0.17-0.37
|
0.40-0.70
|
≤0.035
|
≤0.035
|
0.90-1.20
|
0.15-0.25
|
|
1.7225
|
0.38-0.45
|
≤0.40
|
0.60-0.90
|
≤0.025
|
≤0.035
|
0.90-1.20
|
0.15-0.30
|
|
4140
|
0.38-0.43
|
0.15-0.35
|
0.75-1.00
|
≤0.035
|
≤0.040
|
0.80-1.10
|
0.15-0.25
|
2.Available sizes:
Round: Dia. 10 – 1200mm
Flat: Thickness 10 – 120mm, width 305 – 2200mm
Delivery condition: Hot rolled or forged, Peeled or black surface, annealed or QT.
3.Properties:
One of the chromium, molybdenum, manganese low alloy steels noted for toughness, good torsional strength and good fatigue strength
4.Applications:
Statically and dynamically stressed components for vehicles, engines and machines. For parts of larger cross-sections, crankshafts, gears.
5.Heat Treatment:
Soft annealing: heat to 680-720°C, cool slowly.
Hardness after annealing: Max. 241 HB
Hardening: 820 - 850 °C
Normalizing temperature: 840-880°C
Tempering: 540-680°C
5.
|
Mechanical Properties in Quenched and Tempered 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
|
10
|
40
|
35
|
|
17–40
|
750
|
1000-1200
|
11
|
45
|
40
|
|
41–100
|
650
|
900-1100
|
12
|
50
|
40
|
|
101–160
|
550
|
800-950
|
13
|
50
|
40
|
|
161-250
|
500
|
750-900
|
14
|
55
|
40
|
6. Inspection: 100% Ultrasonic according to the test standards:SEP1921-84,GR.3 CLASS C/C
7. Packing situation: standard seaworthy packing or as customer required
8. Delivery time: 10 days after order confirmed
9. Payment: T/T,D/P or L/C at sight.
10. Process: EAF+LF+VD ( necessary) UT+ Peeled +Turned + Heat Treatment (optional)