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AISI 4140 vs GB/T 3077 12Cr2Ni4A

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

AISI 4140 and GB/T 3077 12Cr2Ni4A (GB/T 3077-2015) are both steel grades. Both fall under the Alloy Steel category. AISI 4140 is typically used for gears, shafts, dies, bolts, crankshafts, tooling, while GB/T 3077 12Cr2Ni4A is commonly used for used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.. AISI 4140 is defined under AISI, originating from United States, while GB/T 3077 12Cr2Ni4A is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, AISI 4140 vs GB/T 3077 12Cr2Ni4A is a 56.1% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With AISI 4140:
GOST 4543 12HN3A NF A35-565 100C6 UNI 11234 100Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 EN 10028-2 10CrMo9-10 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
56.1%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property AISI 4140 GB/T 3077 12Cr2Ni4A
Standard AISI GB/T 3077-2015
Category Alloy Steel Alloy Steel
C (%) 0.38–0.43 0.10-0.15
Mn (%) 0.75–1.00 0.30-0.60
Cr (%) 0.80–1.10 1.25-1.65
Mo (%) 0.15–0.25 Not specified
Si (%) 0.15–0.35 0.17-0.37
S (%) ≤0.040 0.025 max
P (%) ≤0.035 0.025 max
Ni (%) Not specified 3.25-3.75
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property AISI 4140 GB/T 3077 12Cr2Ni4A
Condition Quenched & Tempered Not specified
Tensile Strength 850–1000 MPa 980-1180 MPa
Yield Strength ≥680 MPa 785-980 MPa
Elongation ≥13% 10-14%
Hardness 248–302 HB 58-62 HRC (case)
Impact (Charpy) ≥54 J Not specified
Typical Applications
AISI 4140
Gears, shafts, dies, bolts, crankshafts, tooling
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
Key Differences
Can AISI 4140 Be Substituted With GB/T 3077 12Cr2Ni4A?
AISI 4140 and GB/T 3077 12Cr2Ni4A 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 4140
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5800–7000 mm (228.35–275.59 in)
GB/T 3077 12Cr2Ni4A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5000–6600 mm (196.85–259.84 in)
On M-EX Right Now
AISI 4140
3 active listings and RFQs →
GB/T 3077 12Cr2Ni4A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 4140 and GB/T 3077 12Cr2Ni4A?
AISI 4140 specifies Mo which is not specified for GB/T 3077 12Cr2Ni4A. GB/T 3077 12Cr2Ni4A specifies Ni which is not specified for AISI 4140.
Can AISI 4140 be substituted with GB/T 3077 12Cr2Ni4A?
AISI 4140 and GB/T 3077 12Cr2Ni4A 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.