Strong Match — 86.9% match
based on chemical composition and mechanical property overlap.
GB/T 3077 40CrNi (GB/T 3077:2015) and GB/T 3077 45CrNi (GB/T 3077:2015) are both steel grades.
Both fall under the Alloy Steel category.
GB/T 3077 40CrNi is typically used for hot-rolled or forged structural alloy steel bars, while GB/T 3077 45CrNi is commonly used for hot-rolled or forged structural alloy steel bars.
GB/T 3077 40CrNi is defined under Guobiao Standards (GB/T), originating from China, while GB/T 3077 45CrNi is defined under Guobiao Standards (GB/T), originating from China.
As per chemical composition, GB/T 3077 40CrNi vs GB/T 3077 45CrNi 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 40CrNi
GB/T 3077 45CrNi
Tensile Strength
>=980 MPa
>=980 MPa
Yield Strength
>=785 MPa
>=785 MPa
Elongation
>=10%
>=10%
Hardness
<=241 HB
<=255 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 40CrNi
Hot-rolled or forged structural alloy steel bars
GB/T 3077 45CrNi
Hot-rolled or forged structural alloy steel bars
Can GB/T 3077 40CrNi Be Substituted With GB/T 3077 45CrNi?
GB/T 3077 40CrNi and GB/T 3077 45CrNi overlap closely enough on chemistry and mechanical properties that GB/T 3077 45CrNi is often considered as a substitute for GB/T 3077 40CrNi 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 40CrNi and GB/T 3077 45CrNi?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 3077 40CrNi be substituted with GB/T 3077 45CrNi?
GB/T 3077 40CrNi and GB/T 3077 45CrNi overlap closely enough on chemistry and mechanical properties that GB/T 3077 45CrNi is often considered as a substitute for GB/T 3077 40CrNi in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.