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GB/T 3077 20Mn2 vs BS 970 (Part 1) 170H20

Close Alternative — 77.5% match based on chemical composition and mechanical property overlap.

GB/T 3077 20Mn2 (GB/T 3077:2015) and BS 970 (Part 1) 170H20 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 20Mn2 is typically used for hot-rolled or forged structural alloy steel bars, while BS 970 (Part 1) 170H20 is commonly used for through hardening boron steel (section three). GB/T 3077 20Mn2 is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 1) 170H20 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 3077 20Mn2 vs BS 970 (Part 1) 170H20 is a 77.5% 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 77.5%.

Frequently Compared With GB/T 3077 20Mn2:
NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Mo6 IS 1570 (Part 4) 103Cr6 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
77.5%
MECHANICAL MATCH
No shared data
OVERALL
77.5%
Specifications
Property GB/T 3077 20Mn2 BS 970 (Part 1) 170H20
Standard GB/T 3077:2015 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.17-0.24 0.17-0.23
Si (%) 0.17-0.37 Not specified
Mn (%) 1.40-1.80 0.80-1.10
P (%) <=0.030 Not specified
S (%) <=0.030 Not specified
Cu (%) <=0.30 Not specified
B (%) Not specified 0.0005-0.005
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 20Mn2 BS 970 (Part 1) 170H20
Tensile Strength >=785 MPa Not specified
Yield Strength >=590 MPa Not specified
Elongation >=10% Not specified
Hardness <=187 HB Not specified
Condition Quenched and tempered, test sample 15 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 20Mn2
Hot-rolled or forged structural alloy steel bars
BS 970 (Part 1) 170H20
Through hardening boron steel (section three)
Key Differences
Can GB/T 3077 20Mn2 Be Substituted With BS 970 (Part 1) 170H20?
GB/T 3077 20Mn2 and BS 970 (Part 1) 170H20 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.
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GB/T 3077 20Mn2
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BS 970 (Part 1) 170H20
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Frequently Asked Questions
What is the difference between GB/T 3077 20Mn2 and BS 970 (Part 1) 170H20?
GB/T 3077 20Mn2 specifies Si, P, S, Cu which are not specified for BS 970 (Part 1) 170H20. BS 970 (Part 1) 170H20 specifies B which is not specified for GB/T 3077 20Mn2.
Can GB/T 3077 20Mn2 be substituted with BS 970 (Part 1) 170H20?
GB/T 3077 20Mn2 and BS 970 (Part 1) 170H20 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.