SAE 4340 Steel - Specifications, Equivalents & Listings

Forms: Round Bar Category: Alloy Steel

Grade Details

Grade	SAE J404 4340 / SAE 4340
Standard	SAE J404
Description	Nickel chrome molybdenum high strength alloy steel
Applications	Aircraft parts, heavy duty gears, crankshafts, high tensile bolts

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 →
SAE4340	SAE	USA	17 listings, 15 RFQs →

Market Snapshot

7D Offer Price

▼ -0.1%

15D Offer Price

▼ -0.1%

30D Offer Price

▲ +0.6%

Round Bar →

Balanced

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

Typical Available Sizes

Round Bar	20mm–400mm dia
Flat Bar	25×10mm–300×80mm

Sizes are indicative. Contact seller for exact availability.

Processing:

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

SAE J404 4340 / SAE 4340 Round Bar

5.100 MT

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SAE J404 4340 / SAE 4340 Round Bar

2.800 MT

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SAE J404 4340 / SAE 4340 Round Bar

2.900 MT

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No open buyer requirements for SAE J404 4340 / SAE 4340 at this time.