709M40 is a nickel-chromium-molybdenum alloy steel offering high strength, toughness, and fatigue resistance. It performs well in quenched and tempered condition.
709M40 is a nickel-chromium-molybdenum alloy steel offering high strength, toughness, and fatigue resistance. It performs well in quenched and tempered condition.
Applications
Used for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.
Chemical Composition (%)
C
Mn
Si
Ni
Cr
Mo
S
P
0.36-0.44
0.45-0.70
0.10-0.35
1.30-1.80
0.90-1.40
0.20-0.35
0.040 max
0.040 max
Mechanical Properties
tensile_strength
900-1100 MPa
yield_strength
700-900 MPa
elongation
10-14%
hardness
269-331 HB
Active BS 970:1991 709M40 Listings on M-EX
No active BS 970:1991 709M40 listings at this time.