IS 1570 (Part 7) 3Cr18Ni11H vs BS 970 (Part 3) 304S11
Strong Match — 97.9% match
based on chemical composition and mechanical property overlap.
IS 1570 (Part 7) 3Cr18Ni11H (IS 1570 (Part 7):1992) and BS 970 (Part 3) 304S11 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Stainless Steel category.
IS 1570 (Part 7) 3Cr18Ni11H is typically used for boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature, while BS 970 (Part 3) 304S11 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (table 18).
IS 1570 (Part 7) 3Cr18Ni11H is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 3) 304S11 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, IS 1570 (Part 7) 3Cr18Ni11H vs BS 970 (Part 3) 304S11 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%.
Frequently Compared With IS 1570 (Part 7) 3Cr18Ni11H:
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
IS 1570 (Part 7) 3Cr18Ni11H
BS 970 (Part 3) 304S11
Tensile Strength
490-690 MPa
Not specified
Yield Strength
>=175 MPa (0.2 % proof stress)
Not specified
Elongation
>=30%
Not specified
Condition
Tubes, forgings, plates, Q, thickness - (first row of Table 3)
Not specified
Typical Applications
IS 1570 (Part 7) 3Cr18Ni11H
Boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature
BS 970 (Part 3) 304S11
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (Table 18)
Can IS 1570 (Part 7) 3Cr18Ni11H Be Substituted With BS 970 (Part 3) 304S11?
IS 1570 (Part 7) 3Cr18Ni11H and BS 970 (Part 3) 304S11 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 304S11 is often considered as a substitute for IS 1570 (Part 7) 3Cr18Ni11H 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 1570 (Part 7) 3Cr18Ni11H and BS 970 (Part 3) 304S11?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can IS 1570 (Part 7) 3Cr18Ni11H be substituted with BS 970 (Part 3) 304S11?
IS 1570 (Part 7) 3Cr18Ni11H and BS 970 (Part 3) 304S11 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 304S11 is often considered as a substitute for IS 1570 (Part 7) 3Cr18Ni11H in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.