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GB/T 3077 50B vs GB/T 3077 40MnB

Close Alternative — 73.8% match based on chemical composition and mechanical property overlap.

GB/T 3077 50B (GB/T 3077:2015) and GB/T 3077 40MnB (GB/T 3077:2015) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 50B is typically used for hot-rolled or forged structural alloy steel bars, while GB/T 3077 40MnB is commonly used for hot-rolled or forged structural alloy steel bars. GB/T 3077 50B is defined under Guobiao Standards (GB/T), originating from China, while GB/T 3077 40MnB is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 3077 50B vs GB/T 3077 40MnB is a 85.7% match. As per mechanical properties, the match is 50%. Combined, this makes them a close alternative overall at 73.8%.

Frequently Compared With GB/T 3077 50B:
IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Mo6H IS 4367 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
85.7%
MECHANICAL MATCH
50%
OVERALL
73.8%
Specifications
Property GB/T 3077 50B GB/T 3077 40MnB
Standard GB/T 3077:2015 GB/T 3077:2015
Category Alloy Steel Alloy Steel
C (%) 0.47-0.55 0.37-0.44
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.60-0.90 1.10-1.40
B (%) 0.0008-0.0035 0.0008-0.0035
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 50B GB/T 3077 40MnB
Tensile Strength >=785 MPa >=980 MPa
Yield Strength >=540 MPa >=785 MPa
Elongation >=10% >=10%
Hardness <=207 HB <=207 HB
Condition Quenched and tempered, test sample 20 mm; 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
Typical Applications
GB/T 3077 50B
Hot-rolled or forged structural alloy steel bars
GB/T 3077 40MnB
Hot-rolled or forged structural alloy steel bars
Can GB/T 3077 50B Be Substituted With GB/T 3077 40MnB?
GB/T 3077 50B and GB/T 3077 40MnB 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 50B
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GB/T 3077 40MnB
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Frequently Asked Questions
What is the difference between GB/T 3077 50B and GB/T 3077 40MnB?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 3077 50B be substituted with GB/T 3077 40MnB?
GB/T 3077 50B and GB/T 3077 40MnB 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.