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AISI 5120 vs BS 970 (Part 1) 527H17

Close Alternative — 84.2% match based on chemical composition and mechanical property overlap.

AISI 5120 and BS 970 (Part 1) 527H17 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. AISI 5120 is typically used for case hardened gears, pins, shafts, cams, while BS 970 (Part 1) 527H17 is commonly used for case hardening steel (section four). AISI 5120 is defined under AISI, originating from United States, while BS 970 (Part 1) 527H17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, AISI 5120 vs BS 970 (Part 1) 527H17 is a 84.2% 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 84.2%.

Frequently Compared With AISI 5120:
GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A UNI 11234 100Cr6 NF A35-565 100C6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr4
Match Breakdown
CHEMISTRY MATCH
84.2%
MECHANICAL MATCH
No shared data
OVERALL
84.2%
Specifications
Property AISI 5120 BS 970 (Part 1) 527H17
Standard AISI BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.17–0.22 0.14-0.20
Mn (%) 0.70–0.90 0.70-1.00
Cr (%) 0.70–0.90 0.60-0.90
Si (%) 0.15–0.35 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property AISI 5120 BS 970 (Part 1) 527H17
Condition Carburized & Case Hardened Not specified
Tensile Strength 750–950 MPa Not specified
Case Hardness HRC 58–62 Not specified
Core Hardness HB 207–269 Not specified
Typical Applications
AISI 5120
Case hardened gears, pins, shafts, cams
BS 970 (Part 1) 527H17
Case hardening steel (section four)
Key Differences
Can AISI 5120 Be Substituted With BS 970 (Part 1) 527H17?
AISI 5120 and BS 970 (Part 1) 527H17 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.
Forms & Sizes Available on M-EX
AISI 5120
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5100–6500 mm (200.79–255.91 in)
BS 970 (Part 1) 527H17
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On M-EX Right Now
AISI 5120
2 active listings and RFQs →
BS 970 (Part 1) 527H17
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Frequently Asked Questions
What is the difference between AISI 5120 and BS 970 (Part 1) 527H17?
AISI 5120 specifies Si which is not specified for BS 970 (Part 1) 527H17.
Can AISI 5120 be substituted with BS 970 (Part 1) 527H17?
AISI 5120 and BS 970 (Part 1) 527H17 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.