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GB/T 3077 40CrNiMoA vs GB/T 3077 12Cr2Ni4A

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

GB/T 3077 40CrNiMoA (GB/T 3077-2015) and GB/T 3077 12Cr2Ni4A (GB/T 3077-2015) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 40CrNiMoA is typically used for used for crankshafts, turbine shafts, heavy-duty gears, aircraft landing parts, bolts, and pressure components., while GB/T 3077 12Cr2Ni4A is commonly used for used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.. GB/T 3077 40CrNiMoA is defined under Guobiao Standards (GB/T), originating from China, while GB/T 3077 12Cr2Ni4A is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 3077 40CrNiMoA vs GB/T 3077 12Cr2Ni4A is a 61.1% match. As per mechanical properties, the match is 37.6%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 3077 40CrNiMoA:
UNI 11234 100Cr6 GOST 4543 12HN3A NF A35-565 100C6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
61.1%
MECHANICAL MATCH
37.6%
OVERALL
35%
Specifications
Property GB/T 3077 40CrNiMoA GB/T 3077 12Cr2Ni4A
Standard GB/T 3077-2015 GB/T 3077-2015
Category Alloy Steel Alloy Steel
C (%) 0.37-0.44 0.10-0.15
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.50-0.80 0.30-0.60
Cr (%) 0.60-0.90 1.25-1.65
Ni (%) 1.25-1.65 3.25-3.75
Mo (%) 0.15-0.25 Not specified
P (%) 0.025 max 0.025 max
S (%) 0.025 max 0.025 max
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GB/T 3077 40CrNiMoA GB/T 3077 12Cr2Ni4A
Tensile Strength 1080-1280 MPa 980-1180 MPa
Yield Strength 930-1080 MPa 785-980 MPa
Elongation 10-14% 10-14%
Hardness 30-38 HRC 58-62 HRC (case)
Typical Applications
GB/T 3077 40CrNiMoA
Used for crankshafts, turbine shafts, heavy-duty gears, aircraft landing parts, bolts, and pressure components.
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
Key Differences
Can GB/T 3077 40CrNiMoA Be Substituted With GB/T 3077 12Cr2Ni4A?
GB/T 3077 40CrNiMoA 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
GB/T 3077 40CrNiMoA
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4200–7000 mm (165.35–275.59 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
GB/T 3077 40CrNiMoA
2 active listings and RFQs →
GB/T 3077 12Cr2Ni4A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 40CrNiMoA and GB/T 3077 12Cr2Ni4A?
GB/T 3077 40CrNiMoA specifies Mo which is not specified for GB/T 3077 12Cr2Ni4A.
Can GB/T 3077 40CrNiMoA be substituted with GB/T 3077 12Cr2Ni4A?
GB/T 3077 40CrNiMoA 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.