BS 970 (Part 1) 304S11 vs IS 1570 (Part 7) 3Cr18Ni11H
Strong Match — 97.9% match
based on chemical composition and mechanical property overlap.
BS 970 (Part 1) 304S11 (BS 970 (Part 1):1983) and IS 1570 (Part 7) 3Cr18Ni11H (IS 1570 (Part 7):1992) are both steel grades.
Both fall under the Stainless Steel category.
BS 970 (Part 1) 304S11 is typically used for austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (table 14, with table 15 for the cold drawn condition)., while IS 1570 (Part 7) 3Cr18Ni11H is commonly used for boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature.
BS 970 (Part 1) 304S11 is defined under British Standards (BS), originating from United Kingdom, while IS 1570 (Part 7) 3Cr18Ni11H is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, BS 970 (Part 1) 304S11 vs IS 1570 (Part 7) 3Cr18Ni11H is a 97.9% 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 97.9%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
BS 970 (Part 1) 304S11
IS 1570 (Part 7) 3Cr18Ni11H
Tensile Strength
Not specified
490-690 MPa
Yield Strength
Not specified
>=175 MPa (0.2 % proof stress)
Elongation
Not specified
>=30%
Condition
Not specified
Tubes, forgings, plates, Q, thickness - (first row of Table 3)
Typical Applications
BS 970 (Part 1) 304S11
Austenitic stainless and heat resisting steel for mechanical and allied engineering purposes (Table 14, with Table 15 for the cold drawn condition).
IS 1570 (Part 7) 3Cr18Ni11H
Boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature
Can BS 970 (Part 1) 304S11 Be Substituted With IS 1570 (Part 7) 3Cr18Ni11H?
BS 970 (Part 1) 304S11 and IS 1570 (Part 7) 3Cr18Ni11H overlap closely enough on chemistry and mechanical properties that IS 1570 (Part 7) 3Cr18Ni11H is often considered as a substitute for BS 970 (Part 1) 304S11 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 BS 970 (Part 1) 304S11 and IS 1570 (Part 7) 3Cr18Ni11H?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 1) 304S11 be substituted with IS 1570 (Part 7) 3Cr18Ni11H?
BS 970 (Part 1) 304S11 and IS 1570 (Part 7) 3Cr18Ni11H overlap closely enough on chemistry and mechanical properties that IS 1570 (Part 7) 3Cr18Ni11H is often considered as a substitute for BS 970 (Part 1) 304S11 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.