Strong Match — 93.5% match
based on chemical composition and mechanical property overlap.
ASTM A959 S30430 (ASTM A959:2011) and IS 6603 X03Cr18Ni9Cu4 (IS 6603:2024) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A959 S30430 is typically used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1), while IS 6603 X03Cr18Ni9Cu4 is commonly used for general purposes, semi-finished products, bars, wire rods and bright bars.
ASTM A959 S30430 is defined under ASTM International, originating from United States, while IS 6603 X03Cr18Ni9Cu4 is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, ASTM A959 S30430 vs IS 6603 X03Cr18Ni9Cu4 is a 93.5% 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 93.5%.
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 S30430
IS 6603 X03Cr18Ni9Cu4
Tensile Strength
Not specified
450-650 MPa
Condition
Not specified
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, rod only; Yield Strength is Rp0.2, Elongation is A (longitudinal)
Typical Applications
ASTM A959 S30430
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
IS 6603 X03Cr18Ni9Cu4
General purposes, semi-finished products, bars, wire rods and bright bars
Key Differences
IS 6603 X03Cr18Ni9Cu4 specifies N which is not specified for ASTM A959 S30430.
Can ASTM A959 S30430 Be Substituted With IS 6603 X03Cr18Ni9Cu4?
ASTM A959 S30430 and IS 6603 X03Cr18Ni9Cu4 overlap closely enough on chemistry and mechanical properties that IS 6603 X03Cr18Ni9Cu4 is often considered as a substitute for ASTM A959 S30430 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 S30430 and IS 6603 X03Cr18Ni9Cu4?
IS 6603 X03Cr18Ni9Cu4 specifies N which is not specified for ASTM A959 S30430.
Can ASTM A959 S30430 be substituted with IS 6603 X03Cr18Ni9Cu4?
ASTM A959 S30430 and IS 6603 X03Cr18Ni9Cu4 overlap closely enough on chemistry and mechanical properties that IS 6603 X03Cr18Ni9Cu4 is often considered as a substitute for ASTM A959 S30430 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.