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BS 970 (Part 3) 320S31 vs BS 970 (Part 1) 316S31

Strong Match — 96.6% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 320S31 (BS 970 (Part 3):1991) and BS 970 (Part 1) 316S31 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Stainless Steel category. BS 970 (Part 3) 320S31 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 BS 970 (Part 1) 316S31 is commonly used for austenitic stainless and heat resisting steel (section five). BS 970 (Part 3) 320S31 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 316S31 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 3) 320S31 vs BS 970 (Part 1) 316S31 is a 96.6% 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 96.6%.

Frequently Compared With BS 970 (Part 3) 320S31:
GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4301 EN 10088-1 1.4401 IS 1570 (Part 7) 12Cr12MoH ASTM A959 .- GB/T 3280 06Cr19Ni10 GOST 5632 06Kh23N28 EN 10088-1 1.4845 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo
Match Breakdown
CHEMISTRY MATCH
96.6%
MECHANICAL MATCH
No shared data
OVERALL
96.6%
Specifications
Property BS 970 (Part 3) 320S31 BS 970 (Part 1) 316S31
Standard BS 970 (Part 3):1991 BS 970 (Part 1):1991
Category Stainless Steel Stainless Steel
C (%) <=0.08 <=0.07
Si (%) <=1.0 <=1.0
Mn (%) <=2.0 <=2.0
P (%) <=0.045 <=0.045
S (%) <=0.030 <=0.030
Cr (%) 16.5-18.5 16.5-18.5
Mo (%) 2.00-2.50 2.00-2.50
Ni (%) 11.0-14.0 10.5-13.5
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 3) 320S31 BS 970 (Part 1) 316S31
Condition Not specified Softened, 1000-1100 deg C
Tensile Strength Not specified 510 MPa min
Yield Strength Not specified 205 MPa min (0.2% proof)
Elongation Not specified 40 % min
Hardness Not specified 183 HB max
Typical Applications
BS 970 (Part 3) 320S31
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) 316S31
Austenitic stainless and heat resisting steel (section five)
Can BS 970 (Part 3) 320S31 Be Substituted With BS 970 (Part 1) 316S31?
BS 970 (Part 3) 320S31 and BS 970 (Part 1) 316S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 316S31 is often considered as a substitute for BS 970 (Part 3) 320S31 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 3) 320S31
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BS 970 (Part 1) 316S31
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Frequently Asked Questions
What is the difference between BS 970 (Part 3) 320S31 and BS 970 (Part 1) 316S31?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 3) 320S31 be substituted with BS 970 (Part 1) 316S31?
BS 970 (Part 3) 320S31 and BS 970 (Part 1) 316S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 316S31 is often considered as a substitute for BS 970 (Part 3) 320S31 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.