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BS 970 EN207 vs AISI 5120

Strong Match — 86.5% match based on chemical composition and mechanical property overlap.

BS 970 EN207 (BS 970:1955) and AISI 5120 are both steel grades. Both fall under the Alloy Steel category. BS 970 EN207 is defined under British Standards (BS), originating from United Kingdom, while AISI 5120 is defined under AISI, originating from United States.

As per chemical composition, BS 970 EN207 vs AISI 5120 is a 86.5% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 86.5%.

Frequently Compared With BS 970 EN207:
IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 NF A35-565 100C6 IS 1570 (Part 7) 10Mo6H IS 4367 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
86.5%
MECHANICAL MATCH
No shared data
OVERALL
86.5%
Specifications
Property BS 970 EN207 AISI 5120
Standard BS 970:1955 AISI
Category Alloy Steel Alloy Steel
C (%) 0.16-0.21 0.17–0.22
Si (%) 0.10-0.35 0.15–0.35
Mn (%) 0.60-0.80 0.70–0.90
Cr (%) 0.60-0.80 0.70–0.90
S (%) <=0.050 Not specified
P (%) <=0.050 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 BS 970 EN207 AISI 5120
Condition Not specified Carburized & Case Hardened
Tensile Strength Not specified 750–950 MPa
Case Hardness HRC Not specified 58–62
Core Hardness HB Not specified 207–269
Typical Applications
BS 970 EN207
Not documented
AISI 5120
Case hardened gears, pins, shafts, cams
Key Differences
Can BS 970 EN207 Be Substituted With AISI 5120?
BS 970 EN207 and AISI 5120 overlap closely enough on chemistry and mechanical properties that AISI 5120 is often considered as a substitute for BS 970 EN207 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
BS 970 EN207
No active listings currently.
AISI 5120
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5100–6500 mm (200.79–255.91 in)
On M-EX Right Now
BS 970 EN207
0 active listings and RFQs →
AISI 5120
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN207 and AISI 5120?
BS 970 EN207 specifies S, P which are not specified for AISI 5120.
Can BS 970 EN207 be substituted with AISI 5120?
BS 970 EN207 and AISI 5120 overlap closely enough on chemistry and mechanical properties that AISI 5120 is often considered as a substitute for BS 970 EN207 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.