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GB/T 3077 20CrMo vs GOST 4543 12HN3A

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

GB/T 3077 20CrMo (GB/T 3077:2015) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 20CrMo is typically used for used for gears, shafts, axles, transmission parts, fasteners, and machine components., while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components.. GB/T 3077 20CrMo is defined under Guobiao Standards (GB/T) (China).

As per chemical composition, GB/T 3077 20CrMo vs GOST 4543 12HN3A is a 59.9% match. As per mechanical properties, the match is 25%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 3077 20CrMo:
UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A NF A35-565 100C6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
59.9%
MECHANICAL MATCH
25%
OVERALL
35%
Specifications
Property GB/T 3077 20CrMo GOST 4543 12HN3A
Standard GB/T 3077:2015 GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.17-0.24 0.09-0.16
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.40-0.70 0.3-0.6
Cr (%) 0.80-1.10 0.6-0.9
Mo (%) 0.15-0.25 Not specified
P (%) <=0.030 Not specified
S (%) <=0.030 Not specified
Cu (%) <=0.30 Not specified
Ni (%) Not specified 2.75-3.15
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 20CrMo GOST 4543 12HN3A
Tensile Strength >=885 MPa 850-1050 MPa
Yield Strength >=685 MPa 685 MPa min
Elongation >=12% 11% min
Hardness <=197 HB 58-62 HRC (case)
Condition Quenched and tempered, test sample 15 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 20CrMo
Used for gears, shafts, axles, transmission parts, fasteners, and machine components.
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can GB/T 3077 20CrMo Be Substituted With GOST 4543 12HN3A?
GB/T 3077 20CrMo and GOST 4543 12HN3A 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 20CrMo
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4800–5200 mm (188.98–204.72 in)
GOST 4543 12HN3A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5600–6600 mm (220.47–259.84 in)
On M-EX Right Now
GB/T 3077 20CrMo
2 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 20CrMo and GOST 4543 12HN3A?
GB/T 3077 20CrMo specifies Mo, P, S, Cu which are not specified for GOST 4543 12HN3A. GOST 4543 12HN3A specifies Ni which is not specified for GB/T 3077 20CrMo.
Can GB/T 3077 20CrMo be substituted with GOST 4543 12HN3A?
GB/T 3077 20CrMo and GOST 4543 12HN3A 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.