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SAE J404 4340 / SAE 4340 Steel - Specifications & Listings

SAE J404 4340: Nickel chrome molybdenum steel, very high strength

Forms: Round Bar Flat Bar Forging Category: Alloy Steel
Grade Details
GradeSAE J404 4340 / SAE 4340
StandardSAE J404
DescriptionNickel chrome molybdenum steel, very high strength
ApplicationsAircraft parts, heavy duty gears, crankshafts
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
34CrNiMo6 DIN/EN Europe 3 listings, 0 RFQs →
EN24 BS970 UK 14 listings, 22 RFQs →
SNCM439 JIS Japan 3 listings, 0 RFQs →
Market Snapshot

Sellers asking higher

Daily refresh · 07 Aug 2026

See Full Price Gap →
7D Offer Price
▼ -11.5%
15D Offer Price
▼ -11.5%
30D Offer Price
▼ -11.8%
Supply & Demand by FormSee Full Supply & Demand →
Round Bar →
Balanced
Forging →
Balanced
Flat Bar →
Supply, no demand
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
condition Quenched & Tempered
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.
Surface:
Processing:

Active SAE J404 4340 / SAE 4340 Listings on M-EX (For Sale)

SAE J404 4340 / SAE 4340 Round Bar
2.900 MT
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SAE J404 4340 / SAE 4340 Round Bar
5.000 MT
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SAE J404 4340 / SAE 4340 Round Bar
1.500 MT
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SAE J404 4340 / SAE 4340 Round Bar
4.700 MT
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SAE J404 4340 / SAE 4340 Round Bar
1.600 MT
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SAE J404 4340 / SAE 4340 Round Bar
2.200 MT
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SAE J404 4340 / SAE 4340 Flat Bar
1.200 MT
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SAE J404 4340 / SAE 4340 Forging
2.100 MT
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SAE J404 4340 / SAE 4340 Round Bar
0.800 MT
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SAE J404 4340 / SAE 4340 Round Bar
1.100 MT
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SAE J404 4340 / SAE 4340 Forging
1.000 MT
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SAE J404 4340 / SAE 4340 Round Bar
4.300 MT
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SAE J404 4340 / SAE 4340 Round Bar
2.500 MT
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SAE J404 4340 / SAE 4340 Flat Bar
0.600 MT
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SAE J404 4340 / SAE 4340 Flat Bar
1.800 MT
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Buyer RFQs for SAE J404 4340 / SAE 4340

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SAE J404 4340 / SAE 4340 Round Bar
1.600 MT
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SAE J404 4340 / SAE 4340 Round Bar
2.900 MT
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SAE J404 4340 / SAE 4340 Round Bar
2.000 MT
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SAE J404 4340 / SAE 4340 Round Bar
6.600 MT
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SAE J404 4340 / SAE 4340 Round Bar
0.900 MT
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SAE J404 4340 / SAE 4340 Round Bar
2.500 MT
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SAE J404 4340 / SAE 4340 Round Bar
3.100 MT
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SAE J404 4340 / SAE 4340 Round Bar
1.500 MT
View RFQ
SAE J404 4340 / SAE 4340 Round Bar
2.900 MT
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SAE J404 4340 / SAE 4340 Forging
0.700 MT
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SAE J404 4340 / SAE 4340 Round Bar
1.800 MT
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SAE J404 4340 / SAE 4340 Round Bar
2.700 MT
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SAE J404 4340 / SAE 4340 Round Bar
5.200 MT
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SAE J404 4340 / SAE 4340 Round Bar
1.800 MT
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SAE J404 4340 / SAE 4340 Round Bar
0.900 MT
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