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

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

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

As per chemical composition, BS 970 (Part 1) 304S31 vs ASTM A959 SS304 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 1) 304S31:
GOST 5632 06Kh23N28 GOST 5632 08X18H10 EN 10088-1 1.4301 GB/T 3280 06Cr19Ni10 EN 10088-1 1.4006 EN 10088-1 1.4401 EN 10088-1 1.4845 IS 1570 (Part 7) 12Cr12MoH ASTM A959 .- IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo
Match Breakdown
CHEMISTRY MATCH
96.7%
MECHANICAL MATCH
No shared data
OVERALL
96.7%
Specifications
Property BS 970 (Part 1) 304S31 ASTM A959 SS304
Standard BS 970 (Part 1):1991 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.07 <=0.07
Si (%) <=1.0 <=1.00
Mn (%) <=2.0 <=2.00
P (%) <=0.045 <=0.045
S (%) <=0.030 <=0.030
Cr (%) 17.0-19.0 17.5-19.5
Ni (%) 8.0-11.0 8.0-11.0
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 1) 304S31 ASTM A959 SS304
Condition Softened, 1000-1100 deg C Not specified
Tensile Strength 490 MPa min Not specified
Yield Strength 195 MPa min (0.2% proof) Not specified
Elongation 40 % min Not specified
Hardness 183 HB max Not specified
Typical Applications
BS 970 (Part 1) 304S31
Austenitic stainless and heat resisting steel (section five)
ASTM A959 SS304
Food processing, chemical equipment, kitchen equipment
Can BS 970 (Part 1) 304S31 Be Substituted With ASTM A959 SS304?
BS 970 (Part 1) 304S31 and ASTM A959 SS304 overlap closely enough on chemistry and mechanical properties that ASTM A959 SS304 is often considered as a substitute for BS 970 (Part 1) 304S31 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
BS 970 (Part 1) 304S31
No active listings currently.
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)
On M-EX Right Now
BS 970 (Part 1) 304S31
0 active listings and RFQs →
ASTM A959 SS304
34 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 1) 304S31 and ASTM A959 SS304?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 1) 304S31 be substituted with ASTM A959 SS304?
BS 970 (Part 1) 304S31 and ASTM A959 SS304 overlap closely enough on chemistry and mechanical properties that ASTM A959 SS304 is often considered as a substitute for BS 970 (Part 1) 304S31 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.