Close Alternative — 78.8% match
based on chemical composition and mechanical property overlap.
GB/T 3077 25CrMnSi (GB/T 3077:2015) and EN 10084 20MnCrS5 (EN 10084:2008) are both steel grades.
Both fall under the Alloy Steel category.
GB/T 3077 25CrMnSi is typically used for hot-rolled or forged structural alloy steel bars, while EN 10084 20MnCrS5 is commonly used for case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1).
GB/T 3077 25CrMnSi is defined under Guobiao Standards (GB/T), originating from China, while EN 10084 20MnCrS5 is defined under European Standard (EN), originating from Europe.
As per chemical composition, GB/T 3077 25CrMnSi vs EN 10084 20MnCrS5 is a 68.1% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a close alternative overall at 78.8%.
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 25CrMnSi
EN 10084 20MnCrS5
Tensile Strength
>=1080 MPa
Not specified
Yield Strength
>=885 MPa
Not specified
Elongation
>=10%
Not specified
Hardness
<=217 HB
Soft annealed: 217 HB max
Condition
Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered
Soft annealed
Hardenability
Not specified
+H band at 1.5 mm from the quenched end: 41 to 49 HRC
Typical Applications
GB/T 3077 25CrMnSi
Hot-rolled or forged structural alloy steel bars
EN 10084 20MnCrS5
Case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1)
Key Differences
GB/T 3077 25CrMnSi specifies Cu which is not specified for EN 10084 20MnCrS5.
Can GB/T 3077 25CrMnSi Be Substituted With EN 10084 20MnCrS5?
GB/T 3077 25CrMnSi and EN 10084 20MnCrS5 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.
What is the difference between GB/T 3077 25CrMnSi and EN 10084 20MnCrS5?
GB/T 3077 25CrMnSi specifies Cu which is not specified for EN 10084 20MnCrS5.
Can GB/T 3077 25CrMnSi be substituted with EN 10084 20MnCrS5?
GB/T 3077 25CrMnSi and EN 10084 20MnCrS5 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.