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BS 970 (Part 3) 709M40 vs GB/T 3077 12CrMoV

Related Material — 66% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 709M40 (BS 970 (Part 3):1991) and GB/T 3077 12CrMoV (GB/T 3077:2015) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 3) 709M40 is typically 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), while GB/T 3077 12CrMoV is commonly used for hot-rolled or forged structural alloy steel bars. BS 970 (Part 3) 709M40 is defined under British Standards (BS), originating from United Kingdom, while GB/T 3077 12CrMoV is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, BS 970 (Part 3) 709M40 vs GB/T 3077 12CrMoV is a 66% 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 66%.

Frequently Compared With BS 970 (Part 3) 709M40:
UNI 11234 100Cr6 IS 4367 10Cr9Mo10 IS 11169 (Part 1) 10Ni5Cr4 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
66%
MECHANICAL MATCH
No shared data
OVERALL
66%
Specifications
Property BS 970 (Part 3) 709M40 GB/T 3077 12CrMoV
Standard BS 970 (Part 3):1991 GB/T 3077:2015
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 0.08-0.15
Si (%) 0.10-0.40 0.17-0.37
Mn (%) 0.70-1.00 0.40-0.70
P (%) <=0.035 <=0.030
S (%) <=0.040 <=0.030
Cr (%) 0.90-1.20 0.30-0.60
Mo (%) 0.25-0.35 0.25-0.35
V (%) Not specified 0.15-0.30
Cu (%) Not specified <=0.30
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 (Part 3) 709M40 GB/T 3077 12CrMoV
Tensile Strength Not specified >=440 MPa
Yield Strength Not specified >=225 MPa
Elongation Not specified >=22%
Hardness Not specified <=241 HB
Condition Not specified Quenched and tempered, test sample 30 mm; hardness is for bars delivered annealed or high temperature tempered
Typical Applications
BS 970 (Part 3) 709M40
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 12CrMoV
Hot-rolled or forged structural alloy steel bars
Key Differences
Can BS 970 (Part 3) 709M40 Be Substituted With GB/T 3077 12CrMoV?
BS 970 (Part 3) 709M40 and GB/T 3077 12CrMoV 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.
On M-EX Right Now
BS 970 (Part 3) 709M40
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GB/T 3077 12CrMoV
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Frequently Asked Questions
What is the difference between BS 970 (Part 3) 709M40 and GB/T 3077 12CrMoV?
GB/T 3077 12CrMoV specifies V, Cu which are not specified for BS 970 (Part 3) 709M40.
Can BS 970 (Part 3) 709M40 be substituted with GB/T 3077 12CrMoV?
BS 970 (Part 3) 709M40 and GB/T 3077 12CrMoV 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.