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GB/T 3077 12Cr2Ni4A vs BS 970 (Part 3) 635M15

Related Material — 67.4% match based on chemical composition and mechanical property overlap.

GB/T 3077 12Cr2Ni4A (GB/T 3077-2015) and BS 970 (Part 3) 635M15 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 12Cr2Ni4A is typically used for used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components., while BS 970 (Part 3) 635M15 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (table 15). GB/T 3077 12Cr2Ni4A is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 3) 635M15 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 3077 12Cr2Ni4A vs BS 970 (Part 3) 635M15 is a 67.4% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 67.4%.

Frequently Compared With GB/T 3077 12Cr2Ni4A:
NF A35-565 100C6 GOST 4543 12HN3A IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 12Cr9Mo10H IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 07Cr4Mo6 IS 1570 (Part 7) 12Cr2Mo5V2H UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6
Match Breakdown
CHEMISTRY MATCH
67.4%
MECHANICAL MATCH
No shared data
OVERALL
67.4%
Specifications
Property GB/T 3077 12Cr2Ni4A BS 970 (Part 3) 635M15
Standard GB/T 3077-2015 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.10-0.15 0.12-0.18
Si (%) 0.17-0.37 0.10-0.40
Mn (%) 0.30-0.60 0.60-0.90
Cr (%) 1.25-1.65 0.4-0.80
Ni (%) 3.25-3.75 0.70-1.10
P (%) 0.025 max <=0.04
S (%) 0.025 max <=0.05
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 12Cr2Ni4A BS 970 (Part 3) 635M15
Tensile Strength 980-1180 MPa Not specified
Yield Strength 785-980 MPa Not specified
Elongation 10-14% Not specified
Hardness 58-62 HRC (case) Not specified
Typical Applications
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
BS 970 (Part 3) 635M15
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (Table 15)
Can GB/T 3077 12Cr2Ni4A Be Substituted With BS 970 (Part 3) 635M15?
GB/T 3077 12Cr2Ni4A and BS 970 (Part 3) 635M15 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 12Cr2Ni4A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5000–6600 mm (196.85–259.84 in)
BS 970 (Part 3) 635M15
No active listings currently.
On M-EX Right Now
GB/T 3077 12Cr2Ni4A
2 active listings and RFQs →
BS 970 (Part 3) 635M15
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Frequently Asked Questions
What is the difference between GB/T 3077 12Cr2Ni4A and BS 970 (Part 3) 635M15?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 3077 12Cr2Ni4A be substituted with BS 970 (Part 3) 635M15?
GB/T 3077 12Cr2Ni4A and BS 970 (Part 3) 635M15 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.