Close Alternative — 83.9% match
based on chemical composition and mechanical property overlap.
GB/T 3077 40B (GB/T 3077:2015) and BS 970 (Part 1) 170H41 (BS 970 (Part 1):1983) are both steel grades.
Both fall under the Alloy Steel category.
GB/T 3077 40B is typically used for hot-rolled or forged structural alloy steel bars, while BS 970 (Part 1) 170H41 is commonly used for through hardening steel for mechanical and allied engineering purposes (table 6 gives composition only; see the hardenability tables)..
GB/T 3077 40B is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 1) 170H41 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, GB/T 3077 40B vs BS 970 (Part 1) 170H41 is a 83.9% 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 83.9%.
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 40B
BS 970 (Part 1) 170H41
Tensile Strength
>=785 MPa
Not specified
Yield Strength
>=635 MPa
Not specified
Elongation
>=12%
Not specified
Hardness
<=207 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 40B
Hot-rolled or forged structural alloy steel bars
BS 970 (Part 1) 170H41
Through hardening steel for mechanical and allied engineering purposes (Table 6 gives composition only; see the hardenability tables).
Key Differences
GB/T 3077 40B specifies Si, Cu which are not specified for BS 970 (Part 1) 170H41.
Can GB/T 3077 40B Be Substituted With BS 970 (Part 1) 170H41?
GB/T 3077 40B and BS 970 (Part 1) 170H41 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 40B and BS 970 (Part 1) 170H41?
GB/T 3077 40B specifies Si, Cu which are not specified for BS 970 (Part 1) 170H41.
Can GB/T 3077 40B be substituted with BS 970 (Part 1) 170H41?
GB/T 3077 40B and BS 970 (Part 1) 170H41 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.