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EN 10083-2 C40R vs SAE J404 4340

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

EN 10083-2 C40R (EN 10083-2:2006) and SAE J404 4340 (SAE J404:2009) are both steel grades. EN 10083-2 C40R 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 10083-2 C40R is typically used for quenched and tempered, flame or induction hardened machine parts; can also be used normalized (clause 1), while SAE J404 4340 is commonly used for aircraft parts, heavy duty gears, crankshafts. EN 10083-2 C40R 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 10083-2 C40R vs SAE J404 4340 is a 65.6% 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 10083-2 C40R:
BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 060A32 BS 970 (Part 1) 040A04 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15
Match Breakdown
CHEMISTRY MATCH
65.6%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property EN 10083-2 C40R SAE J404 4340
Standard EN 10083-2:2006 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 (%) <=0.030 <=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 10083-2 C40R SAE J404 4340
Condition Quenched and tempered (+QT), 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 10083-2 C40R
Quenched and tempered, flame or induction hardened machine parts; can also be used normalized (clause 1)
SAE J404 4340
Aircraft parts, heavy duty gears, crankshafts
Key Differences
Can EN 10083-2 C40R Be Substituted With SAE J404 4340?
EN 10083-2 C40R 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 10083-2 C40R
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 10083-2 C40R
0 active listings and RFQs →
SAE J404 4340
32 active listings and RFQs →
Frequently Asked Questions
What is the difference between EN 10083-2 C40R and SAE J404 4340?
Different category: EN 10083-2 C40R is Carbon Steel, SAE J404 4340 is Alloy Steel. EN 10083-2 C40R specifies Cr+Mo+Ni which is not specified for SAE J404 4340.
Can EN 10083-2 C40R be substituted with SAE J404 4340?
EN 10083-2 C40R 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.