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AISI 4340 Steel — Specifications & Listings

AISI

Nickel chrome molybdenum high strength alloy steel

Forms: Round Bar Category: Alloy Steel
Grade Details
GradeAISI 4340
StandardAISI
DescriptionNickel chrome molybdenum high strength alloy steel
ApplicationsAircraft parts, heavy duty gears, crankshafts, high tensile bolts
Equivalent / Similar Grades
Grade Standard Region
34CrNiMo6 DIN/EN Europe
EN24 BS970 UK
SNCM439 JIS Japan
SAE4340 SAE USA
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 AISI 4340 Listings on M-EX

AISI 4340 Round Bar
4.100 MT
View Listing
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