Close Alternative — 79.4% match
based on chemical composition and mechanical property overlap.
GB/T 3077 45Cr (GB/T 3077:2015) and BS 970 (Part 1) 530H40 (BS 970 (Part 1):1983) are both steel grades.
Both fall under the Alloy Steel category.
GB/T 3077 45Cr is typically used for hot-rolled or forged structural alloy steel bars, while BS 970 (Part 1) 530H40 is commonly used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6..
GB/T 3077 45Cr is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 1) 530H40 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, GB/T 3077 45Cr vs BS 970 (Part 1) 530H40 is a 79.4% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
Combined, this makes them a close alternative overall at 79.4%.
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 45Cr
BS 970 (Part 1) 530H40
Tensile Strength
>=1030 MPa
Not specified
Yield Strength
>=835 MPa
Not specified
Elongation
>=9%
Not specified
Hardness
<=217 HB
Not specified
Condition
Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered
Not specified
Typical Applications
GB/T 3077 45Cr
Hot-rolled or forged structural alloy steel bars
BS 970 (Part 1) 530H40
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Key Differences
GB/T 3077 45Cr specifies Si, Cu which are not specified for BS 970 (Part 1) 530H40.
Can GB/T 3077 45Cr Be Substituted With BS 970 (Part 1) 530H40?
GB/T 3077 45Cr and BS 970 (Part 1) 530H40 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 45Cr and BS 970 (Part 1) 530H40?
GB/T 3077 45Cr specifies Si, Cu which are not specified for BS 970 (Part 1) 530H40.
Can GB/T 3077 45Cr be substituted with BS 970 (Part 1) 530H40?
GB/T 3077 45Cr and BS 970 (Part 1) 530H40 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.