Close Alternative — 84.5% match
based on chemical composition and mechanical property overlap.
GB/T 3077 20CrMn (GB/T 3077:2015) and BS 970 (Part 1) 590M17 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Alloy Steel category.
GB/T 3077 20CrMn is typically used for hot-rolled or forged structural alloy steel bars, while BS 970 (Part 1) 590M17 is commonly used for case hardening steel (section four).
GB/T 3077 20CrMn is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 1) 590M17 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, GB/T 3077 20CrMn vs BS 970 (Part 1) 590M17 is a 76.8% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a close alternative overall at 84.5%.
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 20CrMn
BS 970 (Part 1) 590M17
Tensile Strength
>=930 MPa
930 MPa min
Yield Strength
>=735 MPa
Not specified
Elongation
>=10%
10 % min
Hardness
<=187 HB
Not specified
Condition
Quenched and tempered, test sample 15 mm; hardness is for bars delivered annealed or high temperature tempered
Case hardened, 19 mm test bar
Typical Applications
GB/T 3077 20CrMn
Hot-rolled or forged structural alloy steel bars
BS 970 (Part 1) 590M17
Case hardening steel (section four)
Key Differences
GB/T 3077 20CrMn specifies Si, P, S, Cu which are not specified for BS 970 (Part 1) 590M17.
Can GB/T 3077 20CrMn Be Substituted With BS 970 (Part 1) 590M17?
GB/T 3077 20CrMn and BS 970 (Part 1) 590M17 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 20CrMn and BS 970 (Part 1) 590M17?
GB/T 3077 20CrMn specifies Si, P, S, Cu which are not specified for BS 970 (Part 1) 590M17.
Can GB/T 3077 20CrMn be substituted with BS 970 (Part 1) 590M17?
GB/T 3077 20CrMn and BS 970 (Part 1) 590M17 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.