Close Alternative — 73.7% match
based on chemical composition and mechanical property overlap.
BS 970 EN353 (BS 970:1955) and BS 970 (Part 3) 820M17 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Alloy Steel category.
BS 970 EN353 is typically used for heavily loaded gears, cams, camshafts, while BS 970 (Part 3) 820M17 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 EN353 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 3) 820M17 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, BS 970 EN353 vs BS 970 (Part 3) 820M17 is a 73.7% 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 73.7%.
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 EN353
BS 970 (Part 3) 820M17
Tensile Strength
≥1004 MPa (65 tons/sq in, converted)
Not specified
Elongation
≥12%
Not specified
Condition
core, min (lowest-strength condition of the standard)
Not specified
Typical Applications
BS 970 EN353
Heavily loaded gears, cams, camshafts
BS 970 (Part 3) 820M17
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 EN353 Be Substituted With BS 970 (Part 3) 820M17?
BS 970 EN353 and BS 970 (Part 3) 820M17 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.
What is the difference between BS 970 EN353 and BS 970 (Part 3) 820M17?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN353 be substituted with BS 970 (Part 3) 820M17?
BS 970 EN353 and BS 970 (Part 3) 820M17 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.