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BS 970:1991 709M40 Steel - Specifications & Listings

BS 970:1991 709M40: 709M40 is a nickel-chromium-molybdenum alloy steel offering high strength, toughness, and fatigue resistance. It performs well in quenched and tempered condition.

Forms: Round Bar Category: Alloy Steel
Grade Details
GradeBS 970:1991 709M40
StandardBS 970:1991
Description709M40 is a nickel-chromium-molybdenum alloy steel offering high strength, toughness, and fatigue resistance. It performs well in quenched and tempered condition.
ApplicationsUsed for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.
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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

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BS 970:1991 709M40 Round Bar
2.500 MT
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BS 970:1991 709M40 Round Bar
3.700 MT
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