Minimal Match — 50.3% match
based on chemical composition and mechanical property overlap.
IS 6603 X15Cr25Ni21Si (IS 6603:2024) and IS 1570 (Part 7) 12Cr13H (IS 1570 (Part 7):1992) are both steel grades.
Both fall under the Stainless Steel category.
IS 6603 X15Cr25Ni21Si is typically used for general purposes, semi-finished products, bars, wire rods and bright bars, while IS 1570 (Part 7) 12Cr13H is commonly used for boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature.
IS 6603 X15Cr25Ni21Si is defined under Bureau of Indian Standards (IS), originating from India, while IS 1570 (Part 7) 12Cr13H is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, IS 6603 X15Cr25Ni21Si vs IS 1570 (Part 7) 12Cr13H is a 68.4% match.
As per mechanical properties, the match is 14.3%.
Combined, this makes them a minimal match overall at 50.3%.
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 X15Cr25Ni21Si
IS 1570 (Part 7) 12Cr13H
Tensile Strength
550-750 MPa
470-670 MPa
Yield Strength
>=230 MPa
>=265 MPa (0.2 % proof stress)
Elongation
>=30%
>=20%
Condition
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 160 mm; Yield Strength is Rp0.2, Elongation is A (longitudinal)
Bars, forgings, plates, A, thickness up to 160 (first row of Table 3)
Typical Applications
IS 6603 X15Cr25Ni21Si
General purposes, semi-finished products, bars, wire rods and bright bars
IS 1570 (Part 7) 12Cr13H
Boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature
Can IS 6603 X15Cr25Ni21Si Be Substituted With IS 1570 (Part 7) 12Cr13H?
IS 6603 X15Cr25Ni21Si and IS 1570 (Part 7) 12Cr13H share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
What is the difference between IS 6603 X15Cr25Ni21Si and IS 1570 (Part 7) 12Cr13H?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can IS 6603 X15Cr25Ni21Si be substituted with IS 1570 (Part 7) 12Cr13H?
IS 6603 X15Cr25Ni21Si and IS 1570 (Part 7) 12Cr13H share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.