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GB/T 3077 40CrMnMo vs BS 970 (Part 3) 708M40

Close Alternative — 82.4% match based on chemical composition and mechanical property overlap.

GB/T 3077 40CrMnMo (GB/T 3077:2015) and BS 970 (Part 3) 708M40 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 40CrMnMo is typically used for hot-rolled or forged structural alloy steel bars, while BS 970 (Part 3) 708M40 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (table 16). GB/T 3077 40CrMnMo is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 3) 708M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 3077 40CrMnMo vs BS 970 (Part 3) 708M40 is a 82.4% 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 82.4%.

Frequently Compared With GB/T 3077 40CrMnMo:
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
82.4%
MECHANICAL MATCH
No shared data
OVERALL
82.4%
Specifications
Property GB/T 3077 40CrMnMo BS 970 (Part 3) 708M40
Standard GB/T 3077:2015 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.37-0.45 0.36-0.44
Si (%) 0.17-0.37 0.10-0.40
Mn (%) 0.90-1.20 0.70-1.00
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.20-0.30 0.15-0.25
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 40CrMnMo BS 970 (Part 3) 708M40
Tensile Strength >=980 MPa Not specified
Yield Strength >=785 MPa Not specified
Elongation >=10% Not specified
Hardness <=217 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 40CrMnMo
Hot-rolled or forged structural alloy steel bars
BS 970 (Part 3) 708M40
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (Table 16)
Key Differences
Can GB/T 3077 40CrMnMo Be Substituted With BS 970 (Part 3) 708M40?
GB/T 3077 40CrMnMo and BS 970 (Part 3) 708M40 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 40CrMnMo
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BS 970 (Part 3) 708M40
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Frequently Asked Questions
What is the difference between GB/T 3077 40CrMnMo and BS 970 (Part 3) 708M40?
GB/T 3077 40CrMnMo specifies Cu which is not specified for BS 970 (Part 3) 708M40.
Can GB/T 3077 40CrMnMo be substituted with BS 970 (Part 3) 708M40?
GB/T 3077 40CrMnMo and BS 970 (Part 3) 708M40 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.