Strong Match — 86.9% match
based on chemical composition and mechanical property overlap.
GB/T 3077 40Mn2 (GB/T 3077:2015) and GB/T 3077 45Mn2 (GB/T 3077:2015) are both steel grades.
Both fall under the Alloy Steel category.
GB/T 3077 40Mn2 is typically used for hot-rolled or forged structural alloy steel bars, while GB/T 3077 45Mn2 is commonly used for hot-rolled or forged structural alloy steel bars.
GB/T 3077 40Mn2 is defined under Guobiao Standards (GB/T), originating from China, while GB/T 3077 45Mn2 is defined under Guobiao Standards (GB/T), originating from China.
As per chemical composition, GB/T 3077 40Mn2 vs GB/T 3077 45Mn2 is a 92.9% match.
As per mechanical properties, the match is 75%.
Combined, this makes them a strong match overall at 86.9%.
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 40Mn2
GB/T 3077 45Mn2
Tensile Strength
>=885 MPa
>=885 MPa
Yield Strength
>=735 MPa
>=735 MPa
Elongation
>=12%
>=10%
Hardness
<=217 HB
<=217 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 40Mn2
Hot-rolled or forged structural alloy steel bars
GB/T 3077 45Mn2
Hot-rolled or forged structural alloy steel bars
Can GB/T 3077 40Mn2 Be Substituted With GB/T 3077 45Mn2?
GB/T 3077 40Mn2 and GB/T 3077 45Mn2 overlap closely enough on chemistry and mechanical properties that GB/T 3077 45Mn2 is often considered as a substitute for GB/T 3077 40Mn2 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
What is the difference between GB/T 3077 40Mn2 and GB/T 3077 45Mn2?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 3077 40Mn2 be substituted with GB/T 3077 45Mn2?
GB/T 3077 40Mn2 and GB/T 3077 45Mn2 overlap closely enough on chemistry and mechanical properties that GB/T 3077 45Mn2 is often considered as a substitute for GB/T 3077 40Mn2 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.