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EN 10083-1 3C40 vs SAE J404 4340

Related Material — 65% match based on chemical composition and mechanical property overlap.

EN 10083-1 3C40 (EN 10083-1:1991) and SAE J404 4340 (SAE J404:2009) are both steel grades. EN 10083-1 3C40 is classified under Carbon Steel, while SAE J404 4340 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. EN 10083-1 3C40 is typically used for quenched and tempered machine parts; non alloy steels also normalized (clause 1), while SAE J404 4340 is commonly used for aircraft parts, heavy duty gears, crankshafts. EN 10083-1 3C40 is defined under European Standard (EN), originating from Europe, while SAE J404 4340 is defined under SAE International, originating from United States.

As per chemical composition, EN 10083-1 3C40 vs SAE J404 4340 is a 65.2% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 65%.

Frequently Compared With EN 10083-1 3C40:
BS 970 (Part 3) 045A10 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A40 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 060A32
Match Breakdown
CHEMISTRY MATCH
65.2%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property EN 10083-1 3C40 SAE J404 4340
Standard EN 10083-1:1991 SAE J404:2009
Category Carbon Steel Alloy Steel
C (%) 0.37-0.44 0.38-0.43
Cr (%) <=0.40 0.70-0.90
Cr+Mo+Ni (%) <=0.63 Not specified
Mn (%) 0.50-0.80 0.60-0.80
Mo (%) <=0.10 0.20-0.30
Ni (%) <=0.40 1.65-2.00
P (%) <=0.035 <=0.030
S (%) 0.020-0.040 <=0.040
Si (%) <=0.40 0.15-0.35
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property EN 10083-1 3C40 SAE J404 4340
Condition Quenched and tempered, ruling section d <= 16 mm Not specified
Elongation 16% min Not specified
Tensile Strength 650 to 800 MPa Not specified
Yield Strength 460 MPa min Not specified
Typical Applications
EN 10083-1 3C40
Quenched and tempered machine parts; non alloy steels also normalized (clause 1)
SAE J404 4340
Aircraft parts, heavy duty gears, crankshafts
Key Differences
Can EN 10083-1 3C40 Be Substituted With SAE J404 4340?
EN 10083-1 3C40 and SAE J404 4340 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
EN 10083-1 3C40
No active listings currently.
SAE J404 4340
Round Bar → (25 listings)
Diameter: 50–100 mm (1.97–3.94 in)
Length: 3800–7000 mm (149.61–275.59 in)
Forging → (4 listings)
Diameter: 150–200 mm (5.91–7.87 in)
Length: 500–1500 mm (19.69–59.06 in)
Flat Bar → (3 listings)
Thickness: 30–30 mm (1.18–1.18 in)
Width: 120–120 mm (4.72–4.72 in)
Length: 2500–3000 mm (98.43–118.11 in)
On M-EX Right Now
EN 10083-1 3C40
0 active listings and RFQs →
SAE J404 4340
32 active listings and RFQs →
Frequently Asked Questions
What is the difference between EN 10083-1 3C40 and SAE J404 4340?
Different category: EN 10083-1 3C40 is Carbon Steel, SAE J404 4340 is Alloy Steel. EN 10083-1 3C40 specifies Cr+Mo+Ni which is not specified for SAE J404 4340.
Can EN 10083-1 3C40 be substituted with SAE J404 4340?
EN 10083-1 3C40 and SAE J404 4340 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.