Close Alternative — 81.6% match
based on chemical composition and mechanical property overlap.
BS 970 (Part 1) 170H41 (BS 970 (Part 1):1991) and GB/T 3077 40MnB (GB/T 3077:2015) are both steel grades.
Both fall under the Alloy Steel category.
BS 970 (Part 1) 170H41 is typically used for through hardening boron steel (section three), while GB/T 3077 40MnB is commonly used for hot-rolled or forged structural alloy steel bars.
BS 970 (Part 1) 170H41 is defined under British Standards (BS), originating from United Kingdom, while GB/T 3077 40MnB is defined under Guobiao Standards (GB/T), originating from China.
As per chemical composition, BS 970 (Part 1) 170H41 vs GB/T 3077 40MnB is a 81.6% 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 81.6%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
BS 970 (Part 1) 170H41
GB/T 3077 40MnB
Tensile Strength
Not specified
>=980 MPa
Yield Strength
Not specified
>=785 MPa
Elongation
Not specified
>=10%
Hardness
Not specified
<=207 HB
Condition
Not specified
Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered
Typical Applications
BS 970 (Part 1) 170H41
Through hardening boron steel (section three)
GB/T 3077 40MnB
Hot-rolled or forged structural alloy steel bars
Key Differences
GB/T 3077 40MnB specifies Si, P, S, Cu which are not specified for BS 970 (Part 1) 170H41.
Can BS 970 (Part 1) 170H41 Be Substituted With GB/T 3077 40MnB?
BS 970 (Part 1) 170H41 and GB/T 3077 40MnB 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 BS 970 (Part 1) 170H41 and GB/T 3077 40MnB?
GB/T 3077 40MnB specifies Si, P, S, Cu which are not specified for BS 970 (Part 1) 170H41.
Can BS 970 (Part 1) 170H41 be substituted with GB/T 3077 40MnB?
BS 970 (Part 1) 170H41 and GB/T 3077 40MnB 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.