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ASTM A240/A240M S41008 vs BS 970 (Part 1) 410S21

Strong Match — 88.3% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S41008 (ASTM A240/A240M:2025) and BS 970 (Part 1) 410S21 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S41008 is typically used for pressure vessels and general applications (plate, sheet and strip), while BS 970 (Part 1) 410S21 is commonly used for ferritic and martensitic stainless and heat resisting steel (section five). ASTM A240/A240M S41008 is defined under ASTM International, originating from United States, while BS 970 (Part 1) 410S21 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, ASTM A240/A240M S41008 vs BS 970 (Part 1) 410S21 is a 88.3% 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 88.3%.

Frequently Compared With ASTM A240/A240M S41008:
IS 1570 (Part 7) 12Cr12MoVH GOST 5632 06Kh23N28 GOST 5632 08X18H10 EN 10088-1 1.4845 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12Ni2Mo GB/T 3280 06Cr19Ni10 EN 10088-1 1.4006 EN 10088-1 1.4301 EN 10088-1 1.4401 IS 1570 (Part 7) 12Cr12MoH ASTM A959 .-
Match Breakdown
CHEMISTRY MATCH
88.3%
MECHANICAL MATCH
No shared data
OVERALL
88.3%
Specifications
Property ASTM A240/A240M S41008 BS 970 (Part 1) 410S21
Standard ASTM A240/A240M:2025 BS 970 (Part 1):1991
Category Stainless Steel Stainless Steel
C (%) <=0.08 0.09-0.15
Mn (%) <=1.00 <=1.0
P (%) <=0.040 <=0.040
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=1.0
Cr (%) 11.5-13.5 11.5-13.5
Ni (%) <=0.60 <=1.00
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A240/A240M S41008 BS 970 (Part 1) 410S21
Tensile Strength >=415 MPa Not specified
Yield Strength >=205 MPa Not specified
Elongation >=22% Not specified
Hardness <=183 HB Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S41008
Pressure vessels and general applications (plate, sheet and strip)
BS 970 (Part 1) 410S21
Ferritic and martensitic stainless and heat resisting steel (section five)
Can ASTM A240/A240M S41008 Be Substituted With BS 970 (Part 1) 410S21?
ASTM A240/A240M S41008 and BS 970 (Part 1) 410S21 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 410S21 is often considered as a substitute for ASTM A240/A240M S41008 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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ASTM A240/A240M S41008
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BS 970 (Part 1) 410S21
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S41008 and BS 970 (Part 1) 410S21?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A240/A240M S41008 be substituted with BS 970 (Part 1) 410S21?
ASTM A240/A240M S41008 and BS 970 (Part 1) 410S21 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 410S21 is often considered as a substitute for ASTM A240/A240M S41008 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.