Strong Match — 100% match
based on chemical composition and mechanical property overlap.
BS 970 (Part 3) 321S31 (BS 970 (Part 3):1991) and IS 6911 X04Cr18Ni10Nb (IS 6911:1992) are both steel grades.
Both fall under the Stainless Steel category.
BS 970 (Part 3) 321S31 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 IS 6911 X04Cr18Ni10Nb is commonly used for stainless and heat-resisting steel plate, sheet and strip (clause 1.1).
BS 970 (Part 3) 321S31 is defined under British Standards (BS), originating from United Kingdom, while IS 6911 X04Cr18Ni10Nb is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, BS 970 (Part 3) 321S31 vs IS 6911 X04Cr18Ni10Nb is a 100% 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 100%.
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) 321S31
IS 6911 X04Cr18Ni10Nb
Bend Test (180 deg)
Not specified
Not required
Elongation (50 mm, annealed)
Not specified
>=35%
Hardness (annealed, max)
Not specified
192 HBS, 92 HRB
Tensile Strength (annealed)
Not specified
>=490 MPa
Yield Strength (0.2% proof, annealed)
Not specified
>=210 MPa
Typical Applications
BS 970 (Part 3) 321S31
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)
IS 6911 X04Cr18Ni10Nb
Stainless and heat-resisting steel plate, sheet and strip (clause 1.1)
Key Differences
IS 6911 X04Cr18Ni10Nb specifies Nb which is not specified for BS 970 (Part 3) 321S31.
Can BS 970 (Part 3) 321S31 Be Substituted With IS 6911 X04Cr18Ni10Nb?
BS 970 (Part 3) 321S31 and IS 6911 X04Cr18Ni10Nb overlap closely enough on chemistry and mechanical properties that IS 6911 X04Cr18Ni10Nb is often considered as a substitute for BS 970 (Part 3) 321S31 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
What is the difference between BS 970 (Part 3) 321S31 and IS 6911 X04Cr18Ni10Nb?
IS 6911 X04Cr18Ni10Nb specifies Nb which is not specified for BS 970 (Part 3) 321S31.
Can BS 970 (Part 3) 321S31 be substituted with IS 6911 X04Cr18Ni10Nb?
BS 970 (Part 3) 321S31 and IS 6911 X04Cr18Ni10Nb overlap closely enough on chemistry and mechanical properties that IS 6911 X04Cr18Ni10Nb is often considered as a substitute for BS 970 (Part 3) 321S31 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.