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BS 970 EN351 vs BS 970 (Part 3) 805M20

Close Alternative — 70.1% match based on chemical composition and mechanical property overlap.

BS 970 EN351 (BS 970:1955) and BS 970 (Part 3) 805M20 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN351 is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable for tensile strength 45 tons/sq in min., while BS 970 (Part 3) 805M20 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (table 15). BS 970 EN351 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 3) 805M20 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN351 vs BS 970 (Part 3) 805M20 is a 70.1% 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 70.1%.

Frequently Compared With BS 970 EN351:
IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H 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
Match Breakdown
CHEMISTRY MATCH
70.1%
MECHANICAL MATCH
No shared data
OVERALL
70.1%
Specifications
Property BS 970 EN351 BS 970 (Part 3) 805M20
Standard BS 970:1955 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) <=0.20 0.17-0.23
Si (%) <=0.35 0.10-0.40
Mn (%) 0.60-1.00 0.60-0.95
Ni (%) 0.60-1.00 0.35-0.75
Cr (%) 0.40-0.80 0.35-0.65
Mo (%) <=0.10 0.15-0.25
S (%) <=0.050 <=0.05
P (%) <=0.050 <=0.04
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 EN351 BS 970 (Part 3) 805M20
Tensile Strength ≥695 MPa (45 tons/sq in, converted) Not specified
Elongation ≥18% Not specified
Condition core, min (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN351
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for tensile strength 45 tons/sq in min.
BS 970 (Part 3) 805M20
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (Table 15)
Can BS 970 EN351 Be Substituted With BS 970 (Part 3) 805M20?
BS 970 EN351 and BS 970 (Part 3) 805M20 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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BS 970 EN351
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BS 970 (Part 3) 805M20
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Frequently Asked Questions
What is the difference between BS 970 EN351 and BS 970 (Part 3) 805M20?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN351 be substituted with BS 970 (Part 3) 805M20?
BS 970 EN351 and BS 970 (Part 3) 805M20 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.