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BS 970 (Part 1) 170H41 vs GB/T 3077 40MnB

Close Alternative — 82.8% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 170H41 (BS 970 (Part 1):1983) 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 steel for mechanical and allied engineering purposes (table 6 gives composition only; see the hardenability tables)., 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 82.8% 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 82.8%.

Frequently Compared With BS 970 (Part 1) 170H41:
IS 1570 (Part 4) 103Cr4 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 7) 10Mo6H
Match Breakdown
CHEMISTRY MATCH
82.8%
MECHANICAL MATCH
No shared data
OVERALL
82.8%
Specifications
Property BS 970 (Part 1) 170H41 GB/T 3077 40MnB
Standard BS 970 (Part 1):1983 GB/T 3077:2015
Category Alloy Steel Alloy Steel
C (%) 0.37-0.44 0.37-0.44
Mn (%) 0.80-1.10 1.10-1.40
B (%) 0.0005-0.005 0.0008-0.0035
P (%) <=0.035 <=0.030
S (%) <=0.040 <=0.030
Si (%) Not specified 0.17-0.37
Cu (%) Not specified <=0.30
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 steel for mechanical and allied engineering purposes (Table 6 gives composition only; see the hardenability tables).
GB/T 3077 40MnB
Hot-rolled or forged structural alloy steel bars
Key Differences
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.
On M-EX Right Now
BS 970 (Part 1) 170H41
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GB/T 3077 40MnB
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 170H41 and GB/T 3077 40MnB?
GB/T 3077 40MnB specifies Si, 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.