Strong Match — 85.7% match
based on chemical composition and mechanical property overlap.
IS 6603 X04Cr18Ni12Mo3 (IS 6603:2024) and ASTM A240/A240M S31600 (ASTM A240/A240M:2025) are both steel grades.
Both fall under the Stainless Steel category.
IS 6603 X04Cr18Ni12Mo3 is typically used for general purposes, semi-finished products, bars, wire rods and bright bars, while ASTM A240/A240M S31600 is commonly used for pressure vessels and general applications (plate, sheet and strip).
IS 6603 X04Cr18Ni12Mo3 is defined under Bureau of Indian Standards (IS), originating from India, while ASTM A240/A240M S31600 is defined under ASTM International, originating from United States.
As per chemical composition, IS 6603 X04Cr18Ni12Mo3 vs ASTM A240/A240M S31600 is a 78.6% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a strong match overall at 85.7%.
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 X04Cr18Ni12Mo3
ASTM A240/A240M S31600
Tensile Strength
>=515 MPa
>=515 MPa
Yield Strength
>=205 MPa
>=205 MPa
Elongation
>=40%
>=40%
Condition
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, all sizes; Yield Strength is Rp0.2, Elongation is A (longitudinal)
Plate, sheet and strip; yield by 0.2 percent offset
Hardness
Not specified
<=217 HB
Typical Applications
IS 6603 X04Cr18Ni12Mo3
General purposes, semi-finished products, bars, wire rods and bright bars
ASTM A240/A240M S31600
Pressure vessels and general applications (plate, sheet and strip)
Can IS 6603 X04Cr18Ni12Mo3 Be Substituted With ASTM A240/A240M S31600?
IS 6603 X04Cr18Ni12Mo3 and ASTM A240/A240M S31600 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S31600 is often considered as a substitute for IS 6603 X04Cr18Ni12Mo3 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 X04Cr18Ni12Mo3 and ASTM A240/A240M S31600?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can IS 6603 X04Cr18Ni12Mo3 be substituted with ASTM A240/A240M S31600?
IS 6603 X04Cr18Ni12Mo3 and ASTM A240/A240M S31600 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S31600 is often considered as a substitute for IS 6603 X04Cr18Ni12Mo3 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.