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BS 970 (Part 1) 304S15 vs BS 970 (Part 3) 347S31

Strong Match — 91.7% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 304S15 (BS 970 (Part 1):1991) and BS 970 (Part 3) 347S31 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Stainless Steel category. BS 970 (Part 1) 304S15 is typically used for austenitic stainless and heat resisting steel (section five), while BS 970 (Part 3) 347S31 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) 304S15 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 3) 347S31 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 1) 304S15 vs BS 970 (Part 3) 347S31 is a 91.7% 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 91.7%.

Frequently Compared With BS 970 (Part 1) 304S15:
ASTM A959 .- GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4401 IS 1570 (Part 7) 12Cr12Ni2Mo GB/T 3280 06Cr19Ni10 GOST 5632 06Kh23N28 EN 10088-1 1.4301 EN 10088-1 1.4845 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12MoVH
Match Breakdown
CHEMISTRY MATCH
91.7%
MECHANICAL MATCH
No shared data
OVERALL
91.7%
Specifications
Property BS 970 (Part 1) 304S15 BS 970 (Part 3) 347S31
Standard BS 970 (Part 1):1991 BS 970 (Part 3):1991
Category Stainless Steel Stainless Steel
C (%) <=0.06 <=0.08
Si (%) <=1.0 <=1.0
Mn (%) <=2.0 <=2.0
P (%) <=0.045 <=0.045
S (%) <=0.030 <=0.030
Cr (%) 17.5-19.0 17.0-19.0
Ni (%) 8.0-11.0 9.0-12.0
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) 304S15 BS 970 (Part 3) 347S31
Condition Softened, 1000-1100 deg C Not specified
Tensile Strength 480 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) 304S15
Austenitic stainless and heat resisting steel (section five)
BS 970 (Part 3) 347S31
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)
Can BS 970 (Part 1) 304S15 Be Substituted With BS 970 (Part 3) 347S31?
BS 970 (Part 1) 304S15 and BS 970 (Part 3) 347S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 347S31 is often considered as a substitute for BS 970 (Part 1) 304S15 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) 304S15
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BS 970 (Part 3) 347S31
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 304S15 and BS 970 (Part 3) 347S31?
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) 304S15 be substituted with BS 970 (Part 3) 347S31?
BS 970 (Part 1) 304S15 and BS 970 (Part 3) 347S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 347S31 is often considered as a substitute for BS 970 (Part 1) 304S15 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.