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GB/T 3077 34Cr2Ni2Mo vs BS 970 (Part 3) 817M40

Close Alternative — 73.2% match based on chemical composition and mechanical property overlap.

GB/T 3077 34Cr2Ni2Mo (GB/T 3077:2015) and BS 970 (Part 3) 817M40 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 34Cr2Ni2Mo is typically used for hot-rolled or forged structural alloy steel bars, while BS 970 (Part 3) 817M40 is commonly used for high tensile shafts, gears, crankshafts. GB/T 3077 34Cr2Ni2Mo is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 3) 817M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 3077 34Cr2Ni2Mo vs BS 970 (Part 3) 817M40 is a 73.2% 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 73.2%.

Frequently Compared With GB/T 3077 34Cr2Ni2Mo:
IS 1570 (Part 7) 10Mo6H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 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
73.2%
MECHANICAL MATCH
No shared data
OVERALL
73.2%
Specifications
Property GB/T 3077 34Cr2Ni2Mo BS 970 (Part 3) 817M40
Standard GB/T 3077:2015 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.30-0.38 0.36-0.44
Si (%) 0.17-0.37 0.10-0.40
Mn (%) 0.50-0.80 0.45-0.70
Cr (%) 1.30-1.70 1.00-1.40
Mo (%) 0.15-0.30 0.20-0.35
Ni (%) 1.30-1.70 1.30-1.70
P (%) <=0.030 <=0.035
S (%) <=0.030 <=0.040
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 34Cr2Ni2Mo BS 970 (Part 3) 817M40
Tensile Strength >=1080 MPa Not specified
Yield Strength >=930 MPa Not specified
Elongation >=10% Not specified
Hardness <=269 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 34Cr2Ni2Mo
Hot-rolled or forged structural alloy steel bars
BS 970 (Part 3) 817M40
High tensile shafts, gears, crankshafts
Key Differences
Can GB/T 3077 34Cr2Ni2Mo Be Substituted With BS 970 (Part 3) 817M40?
GB/T 3077 34Cr2Ni2Mo and BS 970 (Part 3) 817M40 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 34Cr2Ni2Mo
No active listings currently.
BS 970 (Part 3) 817M40
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6200–6500 mm (244.09–255.91 in)
On M-EX Right Now
GB/T 3077 34Cr2Ni2Mo
0 active listings and RFQs →
BS 970 (Part 3) 817M40
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 34Cr2Ni2Mo and BS 970 (Part 3) 817M40?
GB/T 3077 34Cr2Ni2Mo specifies Cu which is not specified for BS 970 (Part 3) 817M40.
Can GB/T 3077 34Cr2Ni2Mo be substituted with BS 970 (Part 3) 817M40?
GB/T 3077 34Cr2Ni2Mo and BS 970 (Part 3) 817M40 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.