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ASTM A240/A240M S40300 vs BS 970 (Part 1) 410S21

Strong Match — 86.8% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S40300 (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 S40300 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 S40300 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 S40300 vs BS 970 (Part 1) 410S21 is a 86.8% 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 86.8%.

Frequently Compared With ASTM A240/A240M S40300:
EN 10088-1 1.4845 ASTM A959 .- GB/T 3280 06Cr19Ni10 GOST 5632 06Kh23N28 GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4301 EN 10088-1 1.4401 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12Ni2Mo IS 1570 (Part 7) 12Cr13H
Match Breakdown
CHEMISTRY MATCH
86.8%
MECHANICAL MATCH
No shared data
OVERALL
86.8%
Specifications
Property ASTM A240/A240M S40300 BS 970 (Part 1) 410S21
Standard ASTM A240/A240M:2025 BS 970 (Part 1):1991
Category Stainless Steel Stainless Steel
C (%) <=0.15 0.09-0.15
Mn (%) <=1.00 <=1.0
P (%) <=0.040 <=0.040
S (%) <=0.030 <=0.030
Si (%) <=0.50 <=1.0
Cr (%) 11.5-13.0 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 S40300 BS 970 (Part 1) 410S21
Tensile Strength >=485 MPa Not specified
Yield Strength >=205 MPa Not specified
Elongation >=25% Not specified
Hardness <=217 HB Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S40300
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 S40300 Be Substituted With BS 970 (Part 1) 410S21?
ASTM A240/A240M S40300 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 S40300 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 S40300
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BS 970 (Part 1) 410S21
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S40300 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 S40300 be substituted with BS 970 (Part 1) 410S21?
ASTM A240/A240M S40300 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 S40300 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.