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GB/T 3077 30CrMnTi vs GB/T 3077 40CrMn

Close Alternative — 75% match based on chemical composition and mechanical property overlap.

GB/T 3077 30CrMnTi (GB/T 3077:2015) and GB/T 3077 40CrMn (GB/T 3077:2015) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 30CrMnTi is typically used for hot-rolled or forged structural alloy steel bars, while GB/T 3077 40CrMn is commonly used for hot-rolled or forged structural alloy steel bars. GB/T 3077 30CrMnTi is defined under Guobiao Standards (GB/T), originating from China, while GB/T 3077 40CrMn is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 3077 30CrMnTi vs GB/T 3077 40CrMn is a 79.1% match. As per mechanical properties, the match is 66.7%. Combined, this makes them a close alternative overall at 75%.

Frequently Compared With GB/T 3077 30CrMnTi:
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
79.1%
MECHANICAL MATCH
66.7%
OVERALL
75%
Specifications
Property GB/T 3077 30CrMnTi GB/T 3077 40CrMn
Standard GB/T 3077:2015 GB/T 3077:2015
Category Alloy Steel Alloy Steel
C (%) 0.24-0.32 0.37-0.45
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.80-1.10 0.90-1.20
Cr (%) 1.00-1.30 0.90-1.20
Ti (%) 0.04-0.10 Not specified
P (%) <=0.030 <=0.030
S (%) <=0.030 <=0.030
Cu (%) <=0.30 <=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 GB/T 3077 30CrMnTi GB/T 3077 40CrMn
Tensile Strength >=1470 MPa >=980 MPa
Elongation >=9% >=9%
Hardness <=229 HB <=229 HB
Condition Quenched and tempered, test sample Specimen (size not stated); hardness is for bars delivered annealed or high temperature tempered Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered
Yield Strength Not specified >=835 MPa
Typical Applications
GB/T 3077 30CrMnTi
Hot-rolled or forged structural alloy steel bars
GB/T 3077 40CrMn
Hot-rolled or forged structural alloy steel bars
Key Differences
Can GB/T 3077 30CrMnTi Be Substituted With GB/T 3077 40CrMn?
GB/T 3077 30CrMnTi and GB/T 3077 40CrMn 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 30CrMnTi
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GB/T 3077 40CrMn
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Frequently Asked Questions
What is the difference between GB/T 3077 30CrMnTi and GB/T 3077 40CrMn?
GB/T 3077 30CrMnTi specifies Ti which is not specified for GB/T 3077 40CrMn.
Can GB/T 3077 30CrMnTi be substituted with GB/T 3077 40CrMn?
GB/T 3077 30CrMnTi and GB/T 3077 40CrMn 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.