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ISO 683-17 20NiCrMo7 vs GB/T 3077 12Cr2Ni4A

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

ISO 683-17 20NiCrMo7 (ISO 683-17:1999) and GB/T 3077 12Cr2Ni4A (GB/T 3077-2015) are both steel grades. Both fall under the Alloy Steel category. ISO 683-17 20NiCrMo7 is typically used for used in large gears, turbine shafts, marine gearboxes, heavy-duty pinions, and industrial transmissions., while GB/T 3077 12Cr2Ni4A is commonly used for used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.. ISO 683-17 20NiCrMo7 is defined under International Organization for Standardization (ISO), originating from International, while GB/T 3077 12Cr2Ni4A is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, ISO 683-17 20NiCrMo7 vs GB/T 3077 12Cr2Ni4A is a 58.2% match. As per mechanical properties, the match is 24.1%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With ISO 683-17 20NiCrMo7:
UNI 11234 100Cr6 NF A35-565 100C6 GOST 4543 12HN3A IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
58.2%
MECHANICAL MATCH
24.1%
OVERALL
35%
Specifications
Property ISO 683-17 20NiCrMo7 GB/T 3077 12Cr2Ni4A
Standard ISO 683-17:1999 GB/T 3077-2015
Category Alloy Steel Alloy Steel
C (%) 0.17-0.22 0.10-0.15
Si (%) 0.15-0.30 0.17-0.37
Mn (%) 0.45-0.65 0.30-0.60
Cr (%) 0.40-0.60 1.25-1.65
Mo (%) 0.20-0.30 Not specified
Ni (%) 1.65-2.00 3.25-3.75
P (%) <=0.035 0.025 max
S (%) <=0.040 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 ISO 683-17 20NiCrMo7 GB/T 3077 12Cr2Ni4A
Tensile Strength 1000-1300 MPa 980-1180 MPa
Yield Strength 800 MPa min 785-980 MPa
Elongation 9-12% 10-14%
Hardness 300-360 HB 58-62 HRC (case)
Typical Applications
ISO 683-17 20NiCrMo7
Used in large gears, turbine shafts, marine gearboxes, heavy-duty pinions, and industrial transmissions.
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
Key Differences
Can ISO 683-17 20NiCrMo7 Be Substituted With GB/T 3077 12Cr2Ni4A?
ISO 683-17 20NiCrMo7 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
ISO 683-17 20NiCrMo7
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6600–7000 mm (259.84–275.59 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
ISO 683-17 20NiCrMo7
2 active listings and RFQs →
GB/T 3077 12Cr2Ni4A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ISO 683-17 20NiCrMo7 and GB/T 3077 12Cr2Ni4A?
ISO 683-17 20NiCrMo7 specifies Mo which is not specified for GB/T 3077 12Cr2Ni4A.
Can ISO 683-17 20NiCrMo7 be substituted with GB/T 3077 12Cr2Ni4A?
ISO 683-17 20NiCrMo7 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.