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AISI 4340 vs EN 10028-2 10CrMo9-10

Minimal Match — 33.9% match based on chemical composition and mechanical property overlap.

AISI 4340 and EN 10028-2 10CrMo9-10 (EN 10028-2:2017) are both steel grades. Both fall under the Alloy Steel category. AISI 4340 is typically used for aircraft parts, heavy duty gears, crankshafts, high tensile bolts, while EN 10028-2 10CrMo9-10 is commonly used for flat products for pressure purposes. AISI 4340 is defined under AISI, originating from United States, while EN 10028-2 10CrMo9-10 is defined under European Standard (EN), originating from Europe.

As per chemical composition, AISI 4340 vs EN 10028-2 10CrMo9-10 is a 50.9% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 33.9%.

Frequently Compared With AISI 4340:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
50.9%
MECHANICAL MATCH
0%
OVERALL
33.9%
Specifications
Property AISI 4340 EN 10028-2 10CrMo9-10
Standard AISI EN 10028-2:2017
Category Alloy Steel Alloy Steel
C (%) 0.38–0.43 0.08-0.14
Mn (%) 0.60–0.80 0.40-0.80
Cr (%) 0.70–0.90 2.00-2.50
Mo (%) 0.20–0.30 0.90-1.10
Ni (%) 1.65–2.00 Not specified
Si (%) 0.15–0.35 <=0.50
P (%) Not specified <=0.020
S (%) Not specified <=0.010
N (%) Not specified <=0.012
Cu (%) Not specified <=0.30
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property AISI 4340 EN 10028-2 10CrMo9-10
Condition Quenched & Tempered Usual delivery condition normalized and tempered (+NT), nominal thickness up to 16 mm; transverse direction, Yield Strength is ReH, Elongation is A
Tensile Strength 1000–1200 MPa 480-630 MPa
Yield Strength ≥830 MPa >=310 MPa
Elongation ≥12% >=18%
Hardness 285–341 HB Not specified
Typical Applications
AISI 4340
Aircraft parts, heavy duty gears, crankshafts, high tensile bolts
EN 10028-2 10CrMo9-10
Flat products for pressure purposes
Key Differences
Can AISI 4340 Be Substituted With EN 10028-2 10CrMo9-10?
AISI 4340 and EN 10028-2 10CrMo9-10 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
AISI 4340
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5900–6800 mm (232.28–267.72 in)
EN 10028-2 10CrMo9-10
No active listings currently.
On M-EX Right Now
AISI 4340
3 active listings and RFQs →
EN 10028-2 10CrMo9-10
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 4340 and EN 10028-2 10CrMo9-10?
AISI 4340 specifies Ni which is not specified for EN 10028-2 10CrMo9-10. EN 10028-2 10CrMo9-10 specifies P, S, N, Cu which are not specified for AISI 4340.
Can AISI 4340 be substituted with EN 10028-2 10CrMo9-10?
AISI 4340 and EN 10028-2 10CrMo9-10 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.