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BS 970 (Part 1) 302S31 vs BS 970 (Part 3) 303S42

Strong Match — 97.9% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 302S31 (BS 970 (Part 1):1983) and BS 970 (Part 3) 303S42 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Stainless Steel category. BS 970 (Part 1) 302S31 is typically used for austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (table 14, with table 15 for the cold drawn condition)., while BS 970 (Part 3) 303S42 is commonly 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). BS 970 (Part 1) 302S31 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 3) 303S42 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 1) 302S31 vs BS 970 (Part 3) 303S42 is a 97.9% 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 97.9%.

Frequently Compared With BS 970 (Part 1) 302S31:
EN 10088-1 1.4006 GOST 5632 06Kh23N28 EN 10088-1 1.4845 IS 1570 (Part 7) 12Cr13H ASTM A959 .- EN 10088-1 1.4401 IS 1570 (Part 7) 12Cr12MoVH GB/T 3280 06Cr19Ni10 GOST 5632 08X18H10 EN 10088-1 1.4301 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH
Match Breakdown
CHEMISTRY MATCH
97.9%
MECHANICAL MATCH
No shared data
OVERALL
97.9%
Specifications
Property BS 970 (Part 1) 302S31 BS 970 (Part 3) 303S42
Standard BS 970 (Part 1):1983 BS 970 (Part 3):1991
Category Stainless Steel Stainless Steel
C (%) <=0.12 <=0.12
Si (%) <=1.0 <=1.0
Mn (%) <=2.0 <=2.0
P (%) <=0.045 <=0.060
S (%) <=0.030 <=0.060
Cr (%) 17.0-19.0 17.0-19.0
Ni (%) 8.0-10.0 8.0-10.0
Se (%) Not specified 0.15-0.35
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 1) 302S31
Austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (Table 14, with Table 15 for the cold drawn condition).
BS 970 (Part 3) 303S42
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)
Key Differences
Can BS 970 (Part 1) 302S31 Be Substituted With BS 970 (Part 3) 303S42?
BS 970 (Part 1) 302S31 and BS 970 (Part 3) 303S42 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 303S42 is often considered as a substitute for BS 970 (Part 1) 302S31 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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BS 970 (Part 1) 302S31
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BS 970 (Part 3) 303S42
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 302S31 and BS 970 (Part 3) 303S42?
BS 970 (Part 3) 303S42 specifies Se which is not specified for BS 970 (Part 1) 302S31.
Can BS 970 (Part 1) 302S31 be substituted with BS 970 (Part 3) 303S42?
BS 970 (Part 1) 302S31 and BS 970 (Part 3) 303S42 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 303S42 is often considered as a substitute for BS 970 (Part 1) 302S31 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.