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BS 970 (Part 1) 655M13 vs GB/T 3077 12Cr2Ni4A

Minimal Match — 51.7% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 655M13 (BS 970 (Part 1):1991) and GB/T 3077 12Cr2Ni4A (GB/T 3077-2015) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 655M13 is typically used for case hardened gears, heavily loaded shafts, while GB/T 3077 12Cr2Ni4A is commonly used for used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.. BS 970 (Part 1) 655M13 is defined under British Standards (BS), originating from United Kingdom, while GB/T 3077 12Cr2Ni4A is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, BS 970 (Part 1) 655M13 vs GB/T 3077 12Cr2Ni4A is a 77.6% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 51.7%.

Frequently Compared With BS 970 (Part 1) 655M13:
NF A35-565 100C6 GOST 4543 12HN3A UNI 11234 100Cr6 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 7) 10Cr36Mo10H IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
77.6%
MECHANICAL MATCH
0%
OVERALL
51.7%
Specifications
Property BS 970 (Part 1) 655M13 GB/T 3077 12Cr2Ni4A
Standard BS 970 (Part 1):1991 GB/T 3077-2015
Category Alloy Steel Alloy Steel
C (%) 0.10-0.16 0.10-0.15
Mn (%) 0.35-0.60 0.30-0.60
Cr (%) 0.70-1.00 1.25-1.65
Ni (%) 3.00-3.75 3.25-3.75
Si (%) Not specified 0.17-0.37
P (%) Not specified 0.025 max
S (%) Not specified 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 BS 970 (Part 1) 655M13 GB/T 3077 12Cr2Ni4A
Condition Case hardened, 19 mm test bar Not specified
Tensile Strength 1000 MPa min 980-1180 MPa
Elongation 9 % min 10-14%
Yield Strength Not specified 785-980 MPa
Hardness Not specified 58-62 HRC (case)
Typical Applications
BS 970 (Part 1) 655M13
Case hardened gears, heavily loaded shafts
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
Key Differences
Can BS 970 (Part 1) 655M13 Be Substituted With GB/T 3077 12Cr2Ni4A?
BS 970 (Part 1) 655M13 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
BS 970 (Part 1) 655M13
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4200–6300 mm (165.35–248.03 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
BS 970 (Part 1) 655M13
2 active listings and RFQs →
GB/T 3077 12Cr2Ni4A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 1) 655M13 and GB/T 3077 12Cr2Ni4A?
GB/T 3077 12Cr2Ni4A specifies Si, P, S which are not specified for BS 970 (Part 1) 655M13.
Can BS 970 (Part 1) 655M13 be substituted with GB/T 3077 12Cr2Ni4A?
BS 970 (Part 1) 655M13 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.