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