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BS 970 (Part 3) 410S21 vs ASTM A240/A240M S41000

Strong Match — 96.7% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 410S21 (BS 970 (Part 3):1991) and ASTM A240/A240M S41000 (ASTM A240/A240M:2025) are both steel grades. Both fall under the Stainless Steel category. BS 970 (Part 3) 410S21 is typically used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; martensitic stainless steel (table 17), while ASTM A240/A240M S41000 is commonly used for pressure vessels and general applications (plate, sheet and strip). BS 970 (Part 3) 410S21 is defined under British Standards (BS), originating from United Kingdom, while ASTM A240/A240M S41000 is defined under ASTM International, originating from United States.

As per chemical composition, BS 970 (Part 3) 410S21 vs ASTM A240/A240M S41000 is a 96.7% 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 96.7%.

Frequently Compared With BS 970 (Part 3) 410S21:
IS 1570 (Part 7) 12Cr13H ASTM A959 .- IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoVH GB/T 3280 06Cr19Ni10 GOST 5632 08X18H10 EN 10088-1 1.4006 IS 1570 (Part 7) 12Cr12Ni2Mo GOST 5632 06Kh23N28 EN 10088-1 1.4301 EN 10088-1 1.4401 EN 10088-1 1.4845
Match Breakdown
CHEMISTRY MATCH
96.7%
MECHANICAL MATCH
No shared data
OVERALL
96.7%
Specifications
Property BS 970 (Part 3) 410S21 ASTM A240/A240M S41000
Standard BS 970 (Part 3):1991 ASTM A240/A240M:2025
Category Stainless Steel Stainless Steel
C (%) 0.09-0.15 0.08-0.15
Si (%) <=1.0 <=1.00
Mn (%) <=1.0 <=1.00
P (%) <=0.040 <=0.040
S (%) <=0.030 <=0.030
Cr (%) 11.5-13.5 11.5-13.5
Ni (%) <=1.00 <=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 3) 410S21 ASTM A240/A240M S41000
Tensile Strength Not specified >=450 MPa
Yield Strength Not specified >=205 MPa
Elongation Not specified >=20%
Hardness Not specified <=217 HB
Condition Not specified Plate, sheet and strip; yield by 0.2 percent offset
Typical Applications
BS 970 (Part 3) 410S21
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; martensitic stainless steel (Table 17)
ASTM A240/A240M S41000
Pressure vessels and general applications (plate, sheet and strip)
Can BS 970 (Part 3) 410S21 Be Substituted With ASTM A240/A240M S41000?
BS 970 (Part 3) 410S21 and ASTM A240/A240M S41000 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S41000 is often considered as a substitute for BS 970 (Part 3) 410S21 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 3) 410S21
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ASTM A240/A240M S41000
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Frequently Asked Questions
What is the difference between BS 970 (Part 3) 410S21 and ASTM A240/A240M S41000?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 3) 410S21 be substituted with ASTM A240/A240M S41000?
BS 970 (Part 3) 410S21 and ASTM A240/A240M S41000 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S41000 is often considered as a substitute for BS 970 (Part 3) 410S21 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.