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BS 970 (Part 1) 805A20 vs BS 970 (Part 1) 805M20

Strong Match — 94.1% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 805A20 (BS 970 (Part 1):1991) and BS 970 (Part 1) 805M20 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 805A20 is typically used for case hardening steel (section four), while BS 970 (Part 1) 805M20 is commonly used for case hardening steel (section four). BS 970 (Part 1) 805A20 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 805M20 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 1) 805A20 vs BS 970 (Part 1) 805M20 is a 91.1% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 94.1%.

Frequently Compared With BS 970 (Part 1) 805A20:
IS 1570 (Part 4) 10Mo6 NF A35-565 100C6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10 IS 11169 (Part 1) 10Ni5Cr4
Match Breakdown
CHEMISTRY MATCH
91.1%
MECHANICAL MATCH
100%
OVERALL
94.1%
Specifications
Property BS 970 (Part 1) 805A20 BS 970 (Part 1) 805M20
Standard BS 970 (Part 1):1991 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.18-0.23 0.17-0.23
Mn (%) 0.70-0.90 0.60-0.95
Cr (%) 0.40-0.60 0.35-0.65
Mo (%) 0.15-0.25 0.15-0.25
Ni (%) 0.40-0.70 0.35-0.75
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) 805A20 BS 970 (Part 1) 805M20
Condition Case hardened, 19 mm test bar Case hardened, 19 mm test bar
Tensile Strength 850 MPa min 850 MPa min
Elongation 11 % min 11 % min
Typical Applications
BS 970 (Part 1) 805A20
Case hardening steel (section four)
BS 970 (Part 1) 805M20
Case hardening steel (section four)
Can BS 970 (Part 1) 805A20 Be Substituted With BS 970 (Part 1) 805M20?
BS 970 (Part 1) 805A20 and BS 970 (Part 1) 805M20 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 805M20 is often considered as a substitute for BS 970 (Part 1) 805A20 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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BS 970 (Part 1) 805A20
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BS 970 (Part 1) 805M20
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 805A20 and BS 970 (Part 1) 805M20?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 1) 805A20 be substituted with BS 970 (Part 1) 805M20?
BS 970 (Part 1) 805A20 and BS 970 (Part 1) 805M20 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 805M20 is often considered as a substitute for BS 970 (Part 1) 805A20 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.