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GB/T 3077 34CrNi2 vs BS 970 (Part 3) 637M17

Close Alternative — 72.1% match based on chemical composition and mechanical property overlap.

GB/T 3077 34CrNi2 (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 34CrNi2 is typically used for hot-rolled or forged structural alloy steel bars, 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 34CrNi2 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 34CrNi2 vs BS 970 (Part 3) 637M17 is a 72.1% 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 72.1%.

Frequently Compared With GB/T 3077 34CrNi2:
UNI 11234 100Cr6 IS 1570 (Part 7) 10Mo6H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
72.1%
MECHANICAL MATCH
No shared data
OVERALL
72.1%
Specifications
Property GB/T 3077 34CrNi2 BS 970 (Part 3) 637M17
Standard GB/T 3077:2015 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.30-0.37 0.14-0.20
Si (%) 0.17-0.37 0.10-0.40
Mn (%) 0.60-0.90 0.60-0.90
Cr (%) 0.80-1.10 0.60-1.00
Ni (%) 1.20-1.60 0.85-1.25
P (%) <=0.030 <=0.04
S (%) <=0.030 <=0.05
Cu (%) <=0.30 Not specified
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 34CrNi2 BS 970 (Part 3) 637M17
Tensile Strength >=930 MPa Not specified
Yield Strength >=735 MPa Not specified
Elongation >=11% Not specified
Hardness <=241 HB Not specified
Condition Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 34CrNi2
Hot-rolled or forged structural alloy steel bars
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)
Key Differences
Can GB/T 3077 34CrNi2 Be Substituted With BS 970 (Part 3) 637M17?
GB/T 3077 34CrNi2 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.
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GB/T 3077 34CrNi2
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BS 970 (Part 3) 637M17
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Frequently Asked Questions
What is the difference between GB/T 3077 34CrNi2 and BS 970 (Part 3) 637M17?
GB/T 3077 34CrNi2 specifies Cu which is not specified for BS 970 (Part 3) 637M17.
Can GB/T 3077 34CrNi2 be substituted with BS 970 (Part 3) 637M17?
GB/T 3077 34CrNi2 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.