Strong Match — 94.8% match
based on chemical composition and mechanical property overlap.
IS 6603 X04Cr18Ni10Ti (IS 6603:2024) and BS 970 (Part 3) 321S31 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Stainless Steel category.
IS 6603 X04Cr18Ni10Ti is typically used for general purposes, semi-finished products, bars, wire rods and bright bars, while BS 970 (Part 3) 321S31 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).
IS 6603 X04Cr18Ni10Ti is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 3) 321S31 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, IS 6603 X04Cr18Ni10Ti vs BS 970 (Part 3) 321S31 is a 94.8% 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 94.8%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
IS 6603 X04Cr18Ni10Ti
BS 970 (Part 3) 321S31
Tensile Strength
510-710 MPa
Not specified
Yield Strength
>=200 MPa
Not specified
Elongation
>=40%
Not specified
Condition
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 160 mm; Yield Strength is Rp0.2, Elongation is A (longitudinal)
Not specified
Typical Applications
IS 6603 X04Cr18Ni10Ti
General purposes, semi-finished products, bars, wire rods and bright bars
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)
Key Differences
IS 6603 X04Cr18Ni10Ti specifies Ti which is not specified for BS 970 (Part 3) 321S31.
Can IS 6603 X04Cr18Ni10Ti Be Substituted With BS 970 (Part 3) 321S31?
IS 6603 X04Cr18Ni10Ti and BS 970 (Part 3) 321S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 321S31 is often considered as a substitute for IS 6603 X04Cr18Ni10Ti 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 6603 X04Cr18Ni10Ti and BS 970 (Part 3) 321S31?
IS 6603 X04Cr18Ni10Ti specifies Ti which is not specified for BS 970 (Part 3) 321S31.
Can IS 6603 X04Cr18Ni10Ti be substituted with BS 970 (Part 3) 321S31?
IS 6603 X04Cr18Ni10Ti and BS 970 (Part 3) 321S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 321S31 is often considered as a substitute for IS 6603 X04Cr18Ni10Ti in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.