Strong Match — 100% match
based on chemical composition and mechanical property overlap.
IS 6911 X04Cr18Ni10Nb (IS 6911:1992) and BS 970 (Part 1) 321S31 (BS 970 (Part 1):1983) are both steel grades.
Both fall under the Stainless Steel category.
IS 6911 X04Cr18Ni10Nb is typically used for stainless and heat-resisting steel plate, sheet and strip (clause 1.1), while BS 970 (Part 1) 321S31 is commonly used for austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (table 14, with table 15 for the cold drawn condition)..
IS 6911 X04Cr18Ni10Nb is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 1) 321S31 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, IS 6911 X04Cr18Ni10Nb vs BS 970 (Part 1) 321S31 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
IS 6911 X04Cr18Ni10Nb
BS 970 (Part 1) 321S31
Bend Test (180 deg)
Not required
Not specified
Elongation (50 mm, annealed)
>=35%
Not specified
Hardness (annealed, max)
192 HBS, 92 HRB
Not specified
Tensile Strength (annealed)
>=490 MPa
Not specified
Yield Strength (0.2% proof, annealed)
>=210 MPa
Not specified
Typical Applications
IS 6911 X04Cr18Ni10Nb
Stainless and heat-resisting steel plate, sheet and strip (clause 1.1)
BS 970 (Part 1) 321S31
Austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (Table 14, with Table 15 for the cold drawn condition).
Key Differences
IS 6911 X04Cr18Ni10Nb specifies Nb which is not specified for BS 970 (Part 1) 321S31.
BS 970 (Part 1) 321S31 specifies Ti which is not specified for IS 6911 X04Cr18Ni10Nb.
Can IS 6911 X04Cr18Ni10Nb Be Substituted With BS 970 (Part 1) 321S31?
IS 6911 X04Cr18Ni10Nb and BS 970 (Part 1) 321S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 321S31 is often considered as a substitute for IS 6911 X04Cr18Ni10Nb 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 IS 6911 X04Cr18Ni10Nb and BS 970 (Part 1) 321S31?
IS 6911 X04Cr18Ni10Nb specifies Nb which is not specified for BS 970 (Part 1) 321S31. BS 970 (Part 1) 321S31 specifies Ti which is not specified for IS 6911 X04Cr18Ni10Nb.
Can IS 6911 X04Cr18Ni10Nb be substituted with BS 970 (Part 1) 321S31?
IS 6911 X04Cr18Ni10Nb and BS 970 (Part 1) 321S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 321S31 is often considered as a substitute for IS 6911 X04Cr18Ni10Nb in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.