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BS 970 (Part 3) 303S31 vs ASTM A959 .-

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 303S31 (BS 970 (Part 3):1991) and ASTM A959 .- (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. BS 970 (Part 3) 303S31 is typically used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (table 18), while ASTM A959 .- is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). BS 970 (Part 3) 303S31 is defined under British Standards (BS), originating from United Kingdom, while ASTM A959 .- is defined under ASTM International, originating from United States.

As per chemical composition, BS 970 (Part 3) 303S31 vs ASTM A959 .- is a 65.6% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With BS 970 (Part 3) 303S31:
GB/T 3280 06Cr19Ni10 GOST 5632 08X18H10 IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo IS 1570 (Part 7) 12Cr13H GOST 5632 06Kh23N28 EN 10088-1 1.4006 EN 10088-1 1.4301 EN 10088-1 1.4401 EN 10088-1 1.4845 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH
Match Breakdown
CHEMISTRY MATCH
65.6%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property BS 970 (Part 3) 303S31 ASTM A959 .-
Standard BS 970 (Part 3):1991 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.12 <=0.030
Si (%) <=1.0 <=1.00
Mn (%) <=2.0 <=1.00
P (%) <=0.060 <=0.040
S (%) 0.15-0.35 <=0.030
Cr (%) 17.0-19.0 18.0-20.0
Ni (%) 8.0-10.0 <=0.50
Cb (%) Not specified 0.10-0.60
N (%) Not specified <=0.030
Ti (%) Not specified 0.07-0.30
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
BS 970 (Part 3) 303S31
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (Table 18)
ASTM A959 .-
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can BS 970 (Part 3) 303S31 Be Substituted With ASTM A959 .-?
BS 970 (Part 3) 303S31 and ASTM A959 .- share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
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BS 970 (Part 3) 303S31
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ASTM A959 .-
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Frequently Asked Questions
What is the difference between BS 970 (Part 3) 303S31 and ASTM A959 .-?
ASTM A959 .- specifies Cb, N, Ti which are not specified for BS 970 (Part 3) 303S31.
Can BS 970 (Part 3) 303S31 be substituted with ASTM A959 .-?
BS 970 (Part 3) 303S31 and ASTM A959 .- share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.