Strong Match — 93.6% match
based on chemical composition and mechanical property overlap.
IS 6603 X10Cr18Ni9S (IS 6603:2024) and ASTM A959 303 (ASTM A959:2011) are both steel grades.
Both fall under the Stainless Steel category.
IS 6603 X10Cr18Ni9S is typically used for general purposes, semi-finished products, bars, wire rods and bright bars, while ASTM A959 303 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1).
IS 6603 X10Cr18Ni9S is defined under Bureau of Indian Standards (IS), originating from India, while ASTM A959 303 is defined under ASTM International, originating from United States.
As per chemical composition, IS 6603 X10Cr18Ni9S vs ASTM A959 303 is a 93.6% 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 93.6%.
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 X10Cr18Ni9S
ASTM A959 303
Tensile Strength
500-700 MPa
Not specified
Yield Strength
>=190 MPa
Not specified
Elongation
>=35%
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 X10Cr18Ni9S
General purposes, semi-finished products, bars, wire rods and bright bars
ASTM A959 303
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
IS 6603 X10Cr18Ni9S specifies N which is not specified for ASTM A959 303.
Can IS 6603 X10Cr18Ni9S Be Substituted With ASTM A959 303?
IS 6603 X10Cr18Ni9S and ASTM A959 303 overlap closely enough on chemistry and mechanical properties that ASTM A959 303 is often considered as a substitute for IS 6603 X10Cr18Ni9S 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 X10Cr18Ni9S and ASTM A959 303?
IS 6603 X10Cr18Ni9S specifies N which is not specified for ASTM A959 303.
Can IS 6603 X10Cr18Ni9S be substituted with ASTM A959 303?
IS 6603 X10Cr18Ni9S and ASTM A959 303 overlap closely enough on chemistry and mechanical properties that ASTM A959 303 is often considered as a substitute for IS 6603 X10Cr18Ni9S in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.