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ASTM A959 321 vs BS 970 (Part 1) 321S31

Strong Match — 97.2% match based on chemical composition and mechanical property overlap.

ASTM A959 321 (ASTM A959:2011) and BS 970 (Part 1) 321S31 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Stainless Steel category. ASTM A959 321 is typically used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1), while BS 970 (Part 1) 321S31 is commonly used for austenitic stainless and heat resisting steel (section five). ASTM A959 321 is defined under ASTM International, originating from United States, while BS 970 (Part 1) 321S31 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, ASTM A959 321 vs BS 970 (Part 1) 321S31 is a 97.2% 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 97.2%.

Frequently Compared With ASTM A959 321:
GB/T 3280 06Cr19Ni10 EN 10088-1 1.4301 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12Ni2Mo EN 10088-1 1.4401 EN 10088-1 1.4845 IS 1570 (Part 7) 12Cr13H ASTM A959 .- GOST 5632 06Kh23N28 EN 10088-1 1.4006
Match Breakdown
CHEMISTRY MATCH
97.2%
MECHANICAL MATCH
No shared data
OVERALL
97.2%
Specifications
Property ASTM A959 321 BS 970 (Part 1) 321S31
Standard ASTM A959:2011 BS 970 (Part 1):1991
Category Stainless Steel Stainless Steel
C (%) <=0.08 <=0.08
Cr (%) 17.0-19.0 17.0-19.0
Mn (%) <=2.00 <=2.0
N (%) <=0.10 Not specified
Ni (%) 9.0-12.0 9.0-12.0
P (%) <=0.045 <=0.045
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=1.0
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A959 321 BS 970 (Part 1) 321S31
Condition Not specified Softened, 1000-1100 deg C
Tensile Strength Not specified 510 MPa min
Yield Strength Not specified 200 MPa min (0.2% proof)
Elongation Not specified 35 % min
Hardness Not specified 183 HB max
Typical Applications
ASTM A959 321
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
BS 970 (Part 1) 321S31
Austenitic stainless and heat resisting steel (section five)
Key Differences
Can ASTM A959 321 Be Substituted With BS 970 (Part 1) 321S31?
ASTM A959 321 and BS 970 (Part 1) 321S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 321S31 is often considered as a substitute for ASTM A959 321 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 A959 321
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Frequently Asked Questions
What is the difference between ASTM A959 321 and BS 970 (Part 1) 321S31?
ASTM A959 321 specifies N which is not specified for BS 970 (Part 1) 321S31.
Can ASTM A959 321 be substituted with BS 970 (Part 1) 321S31?
ASTM A959 321 and BS 970 (Part 1) 321S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 321S31 is often considered as a substitute for ASTM A959 321 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.