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

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

GB/T 3077 40Cr (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 40Cr is typically used for shafts, gears, bolts, spindles, connecting rods, machine parts, 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 40Cr 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 40Cr vs GB/T 3077 12Cr2Ni4A is a 66.4% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 3077 40Cr:
UNI 11234 100Cr6 NF A35-565 100C6 GOST 4543 12HN3A IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
66.4%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property GB/T 3077 40Cr 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 (%) 0.80-1.10 1.25-1.65
P (%) <=0.030 0.025 max
S (%) <=0.030 0.025 max
Cu (%) <=0.30 Not specified
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 GB/T 3077 40Cr GB/T 3077 12Cr2Ni4A
Tensile Strength >=980 MPa 980-1180 MPa
Yield Strength >=785 MPa 785-980 MPa
Elongation >=9% 10-14%
Hardness <=207 HB 58-62 HRC (case)
Condition Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 40Cr
shafts, gears, bolts, spindles, connecting rods, machine parts
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
Key Differences
Can GB/T 3077 40Cr Be Substituted With GB/T 3077 12Cr2Ni4A?
GB/T 3077 40Cr 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 40Cr
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5200–5900 mm (204.72–232.28 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 40Cr
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 40Cr and GB/T 3077 12Cr2Ni4A?
GB/T 3077 40Cr specifies Cu which is not specified for GB/T 3077 12Cr2Ni4A. GB/T 3077 12Cr2Ni4A specifies Ni which is not specified for GB/T 3077 40Cr.
Can GB/T 3077 40Cr be substituted with GB/T 3077 12Cr2Ni4A?
GB/T 3077 40Cr 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.