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GB/T 3077 15CrNi6 vs BS 970 (Part 3) 637M17

Close Alternative — 75.5% match based on chemical composition and mechanical property overlap.

GB/T 3077 15CrNi6 (GB/T 3077-2015) and BS 970 (Part 3) 637M17 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 15CrNi6 is typically used for used for gears, shafts, pinions, crankshafts, transmission parts, and heavy-duty couplings., while BS 970 (Part 3) 637M17 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 15CrNi6 is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 3) 637M17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 3077 15CrNi6 vs BS 970 (Part 3) 637M17 is a 75.5% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 75.5%.

Frequently Compared With GB/T 3077 15CrNi6:
GOST 4543 12HN3A GB/T 3077 12Cr2Ni4A NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 103Cr4 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Cr20Mo6
Match Breakdown
CHEMISTRY MATCH
75.5%
MECHANICAL MATCH
No shared data
OVERALL
75.5%
Specifications
Property GB/T 3077 15CrNi6 BS 970 (Part 3) 637M17
Standard GB/T 3077-2015 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.12-0.18 0.14-0.20
Si (%) 0.17-0.37 0.10-0.40
Mn (%) 0.30-0.60 0.60-0.90
Cr (%) 0.60-0.90 0.60-1.00
Ni (%) 1.40-1.70 0.85-1.25
P (%) 0.030 max <=0.04
S (%) 0.030 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 15CrNi6 BS 970 (Part 3) 637M17
Tensile Strength 880-1080 MPa Not specified
Yield Strength 685-880 MPa Not specified
Elongation 10-14% Not specified
Hardness 58-62 HRC (case) Not specified
Typical Applications
GB/T 3077 15CrNi6
Used for gears, shafts, pinions, crankshafts, transmission parts, and heavy-duty couplings.
BS 970 (Part 3) 637M17
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 15CrNi6 Be Substituted With BS 970 (Part 3) 637M17?
GB/T 3077 15CrNi6 and BS 970 (Part 3) 637M17 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
GB/T 3077 15CrNi6
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5100–6700 mm (200.79–263.78 in)
BS 970 (Part 3) 637M17
No active listings currently.
On M-EX Right Now
GB/T 3077 15CrNi6
2 active listings and RFQs →
BS 970 (Part 3) 637M17
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 15CrNi6 and BS 970 (Part 3) 637M17?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 3077 15CrNi6 be substituted with BS 970 (Part 3) 637M17?
GB/T 3077 15CrNi6 and BS 970 (Part 3) 637M17 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.