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ASTM A959 SS304 vs BS 970 (Part 1) 304S31

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

ASTM A959 SS304 (ASTM A959:2011) and BS 970 (Part 1) 304S31 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Stainless Steel category. ASTM A959 SS304 is typically used for food processing, chemical equipment, kitchen equipment, while BS 970 (Part 1) 304S31 is commonly used for austenitic stainless and heat resisting steel (section five). ASTM A959 SS304 is defined under ASTM International, originating from United States, while BS 970 (Part 1) 304S31 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, ASTM A959 SS304 vs BS 970 (Part 1) 304S31 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 ASTM A959 SS304:
EN 10088-1 1.4845 EN 10088-1 1.4301 GB/T 3280 06Cr19Ni10 GOST 5632 06Kh23N28 GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4401 GOST 5632 12Kh13 ASTM A959 .- IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12Ni2Mo
Match Breakdown
CHEMISTRY MATCH
96.7%
MECHANICAL MATCH
No shared data
OVERALL
96.7%
Specifications
Property ASTM A959 SS304 BS 970 (Part 1) 304S31
Standard ASTM A959:2011 BS 970 (Part 1):1991
Category Stainless Steel Stainless Steel
C (%) <=0.07 <=0.07
Cr (%) 17.5-19.5 17.0-19.0
Mn (%) <=2.00 <=2.0
Ni (%) 8.0-11.0 8.0-11.0
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 SS304 BS 970 (Part 1) 304S31
Condition Not specified Softened, 1000-1100 deg C
Tensile Strength Not specified 490 MPa min
Yield Strength Not specified 195 MPa min (0.2% proof)
Elongation Not specified 40 % min
Hardness Not specified 183 HB max
Typical Applications
ASTM A959 SS304
Food processing, chemical equipment, kitchen equipment
BS 970 (Part 1) 304S31
Austenitic stainless and heat resisting steel (section five)
Can ASTM A959 SS304 Be Substituted With BS 970 (Part 1) 304S31?
ASTM A959 SS304 and BS 970 (Part 1) 304S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 304S31 is often considered as a substitute for ASTM A959 SS304 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
ASTM A959 SS304
Sheet → (22 listings)
Thickness: 2–6 mm (0.08–0.24 in)
Width: 1250–1250 mm (49.21–49.21 in)
Length: 2500–4100 mm (98.43–161.42 in)
Round Bar → (6 listings)
Diameter: 50–65 mm (1.97–2.56 in)
Length: 2500–6900 mm (98.43–271.65 in)
Plate → (6 listings)
Thickness: 8–12 mm (0.31–0.47 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–3800 mm (98.43–149.61 in)
BS 970 (Part 1) 304S31
No active listings currently.
On M-EX Right Now
ASTM A959 SS304
34 active listings and RFQs →
BS 970 (Part 1) 304S31
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A959 SS304 and BS 970 (Part 1) 304S31?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A959 SS304 be substituted with BS 970 (Part 1) 304S31?
ASTM A959 SS304 and BS 970 (Part 1) 304S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 304S31 is often considered as a substitute for ASTM A959 SS304 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.