Strong Match — 88% match
based on chemical composition and mechanical property overlap.
ASTM A240/A240M S31700 (ASTM A240/A240M:2025) and IS 6603 X04Cr18Ni12Mo3 (IS 6603:2024) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A240/A240M S31700 is typically used for pressure vessels and general applications (plate, sheet and strip), while IS 6603 X04Cr18Ni12Mo3 is commonly used for general purposes, semi-finished products, bars, wire rods and bright bars.
ASTM A240/A240M S31700 is defined under ASTM International, originating from United States, while IS 6603 X04Cr18Ni12Mo3 is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, ASTM A240/A240M S31700 vs IS 6603 X04Cr18Ni12Mo3 is a 98.6% match.
As per mechanical properties, the match is 66.7%.
Combined, this makes them a strong match overall at 88%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
ASTM A240/A240M S31700
IS 6603 X04Cr18Ni12Mo3
Tensile Strength
>=515 MPa
>=515 MPa
Yield Strength
>=205 MPa
>=205 MPa
Elongation
>=35%
>=40%
Hardness
<=217 HB
Not specified
Condition
Plate, sheet and strip; yield by 0.2 percent offset
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, all sizes; Yield Strength is Rp0.2, Elongation is A (longitudinal)
Typical Applications
ASTM A240/A240M S31700
Pressure vessels and general applications (plate, sheet and strip)
IS 6603 X04Cr18Ni12Mo3
General purposes, semi-finished products, bars, wire rods and bright bars
Can ASTM A240/A240M S31700 Be Substituted With IS 6603 X04Cr18Ni12Mo3?
ASTM A240/A240M S31700 and IS 6603 X04Cr18Ni12Mo3 overlap closely enough on chemistry and mechanical properties that IS 6603 X04Cr18Ni12Mo3 is often considered as a substitute for ASTM A240/A240M S31700 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 A240/A240M S31700 and IS 6603 X04Cr18Ni12Mo3?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A240/A240M S31700 be substituted with IS 6603 X04Cr18Ni12Mo3?
ASTM A240/A240M S31700 and IS 6603 X04Cr18Ni12Mo3 overlap closely enough on chemistry and mechanical properties that IS 6603 X04Cr18Ni12Mo3 is often considered as a substitute for ASTM A240/A240M S31700 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.