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SAE 4340 Steel — Specifications & Listings

SAENickel chrome molybdenum steel, very high strength

Forms: Round Bar Flat Bar Forging Category: Alloy Steel
Grade Details
GradeSAE 4340
StandardSAE
DescriptionNickel chrome molybdenum steel, very high strength
ApplicationsAircraft parts, heavy duty gears, crankshafts
Equivalent / Similar Grades
Grade Standard Region
34CrNiMo6 DIN/EN Europe
EN24 BS970 UK
SNCM439 JIS Japan
Chemical Composition (%)
C Mn Cr Mo Ni Si
0.38–0.43 0.60–0.80 0.70–0.90 0.20–0.30 1.65–2.00 0.15–0.35
Mechanical Properties
Tensile Strength 1000–1200 MPa
Yield Strength ≥830 MPa
Elongation ≥12%
Hardness 285–341 HB
Typical Available Sizes
Round Bar 20mm–400mm dia
Flat Bar 25×10mm–300×80mm
Sizes are indicative. Contact seller for exact availability.

Active SAE 4340 Listings on M-EX

SAE 4340 Round Bar
0.800 MT
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SAE 4340 Forging
2.100 MT
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SAE 4340 Round Bar
5.200 MT
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SAE 4340 Flat Bar
0.700 MT
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SAE 4340 Round Bar
1.100 MT
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SAE 4340 Forging
1.000 MT
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SAE 4340 Flat Bar
2.000 MT
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SAE 4340 Round Bar
1.900 MT
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SAE 4340 Forging
1.600 MT
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SAE 4340 Round Bar
2.900 MT
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