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GB/T 3077 45B vs GB/T 3077 40B

Close Alternative — 70.2% match based on chemical composition and mechanical property overlap.

GB/T 3077 45B (GB/T 3077:2015) and GB/T 3077 40B (GB/T 3077:2015) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 45B is typically used for hot-rolled or forged structural alloy steel bars, while GB/T 3077 40B is commonly used for hot-rolled or forged structural alloy steel bars. GB/T 3077 45B is defined under Guobiao Standards (GB/T), originating from China, while GB/T 3077 40B is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 3077 45B vs GB/T 3077 40B is a 92.9% match. As per mechanical properties, the match is 25%. Combined, this makes them a close alternative overall at 70.2%.

Frequently Compared With GB/T 3077 45B:
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) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
92.9%
MECHANICAL MATCH
25%
OVERALL
70.2%
Specifications
Property GB/T 3077 45B GB/T 3077 40B
Standard GB/T 3077:2015 GB/T 3077:2015
Category Alloy Steel Alloy Steel
C (%) 0.42-0.49 0.37-0.44
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.60-0.90 0.60-0.90
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 45B GB/T 3077 40B
Tensile Strength >=835 MPa >=785 MPa
Yield Strength >=685 MPa >=635 MPa
Elongation >=12% >=12%
Hardness <=217 HB <=207 HB
Condition Quenched and tempered, test sample 25 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 45B
Hot-rolled or forged structural alloy steel bars
GB/T 3077 40B
Hot-rolled or forged structural alloy steel bars
Can GB/T 3077 45B Be Substituted With GB/T 3077 40B?
GB/T 3077 45B and GB/T 3077 40B 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 45B
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GB/T 3077 40B
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Frequently Asked Questions
What is the difference between GB/T 3077 45B and GB/T 3077 40B?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 3077 45B be substituted with GB/T 3077 40B?
GB/T 3077 45B and GB/T 3077 40B 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.