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AISI 4340 vs UNI 11234 100Cr6

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

AISI 4340 and UNI 11234 100Cr6 (UNI 11234:2007) 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 UNI 11234 100Cr6 is commonly used for ball bearings,roller bearings,needle bearings,dies,punches,gauges,wear resistant components. AISI 4340 is defined under AISI, originating from United States, while UNI 11234 100Cr6 is defined under Ente Nazionale Italiano di Unificazione (UNI), originating from Italy.

As per chemical composition, AISI 4340 vs UNI 11234 100Cr6 is a 57.1% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With AISI 4340:
NF A35-565 100C6 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 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
57.1%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property AISI 4340 UNI 11234 100Cr6
Standard AISI UNI 11234:2007
Category Alloy Steel Alloy Steel
C (%) 0.38–0.43 0.93-1.05
Mn (%) 0.60–0.80 0.25-0.45
Cr (%) 0.70–0.90 1.35-1.65
Mo (%) 0.20–0.30 Not specified
Ni (%) 1.65–2.00 Not specified
Si (%) 0.15–0.35 0.15-0.35
P (%) Not specified <=0.025
S (%) Not specified <=0.025
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 UNI 11234 100Cr6
Condition Quenched & Tempered Not specified
Tensile Strength 1000–1200 MPa 750-1000 MPa
Yield Strength ≥830 MPa 400-600 MPa
Elongation ≥12% 10-14 %
Hardness 285–341 HB 60-64 HRC
Typical Applications
AISI 4340
Aircraft parts, heavy duty gears, crankshafts, high tensile bolts
UNI 11234 100Cr6
ball bearings,roller bearings,needle bearings,dies,punches,gauges,wear resistant components
Key Differences
Can AISI 4340 Be Substituted With UNI 11234 100Cr6?
AISI 4340 and UNI 11234 100Cr6 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)
UNI 11234 100Cr6
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5700–6800 mm (224.41–267.72 in)
On M-EX Right Now
AISI 4340
3 active listings and RFQs →
UNI 11234 100Cr6
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 4340 and UNI 11234 100Cr6?
AISI 4340 specifies Mo, Ni which are not specified for UNI 11234 100Cr6. UNI 11234 100Cr6 specifies P, S which are not specified for AISI 4340.
Can AISI 4340 be substituted with UNI 11234 100Cr6?
AISI 4340 and UNI 11234 100Cr6 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.