Minimal Match — 45.5% match
based on chemical composition and mechanical property overlap.
ASTM A387/A387M Grade 91 (ASTM A387/A387M:2011) and IS 4367 10Cr9Mo10 (IS 4367:1991) are both steel grades.
Both fall under the Alloy Steel category.
ASTM A387/A387M Grade 91 is defined under ASTM International, originating from United States, while IS 4367 10Cr9Mo10 is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, ASTM A387/A387M Grade 91 vs IS 4367 10Cr9Mo10 is a 51.4% match.
As per mechanical properties, the match is 33.8%.
Combined, this makes them a minimal match overall at 45.5%.
Frequently Compared With ASTM A387/A387M Grade 91:
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
ASTM A387/A387M Grade 91
IS 4367 10Cr9Mo10
Tensile Strength
585-760 MPa
410-590 MPa
Yield Strength
>=415 MPa
245 MPa min
Elongation
>=18%
>=18%
Condition
Class 2 plates, no thickness ranges printed; elongation in 50 mm gauge length
Normalised and tempered, ruling section up to 50 mm
Izod Impact
Not specified
55 J min
Hardness (soft annealed)
Not specified
<=187 HB
Typical Applications
ASTM A387/A387M Grade 91
Welded boilers and pressure vessels for elevated temperature service
IS 4367 10Cr9Mo10
Not documented
Key Differences
ASTM A387/A387M Grade 91 specifies V, Nb, N, Al which are not specified for IS 4367 10Cr9Mo10.
Can ASTM A387/A387M Grade 91 Be Substituted With IS 4367 10Cr9Mo10?
ASTM A387/A387M Grade 91 and IS 4367 10Cr9Mo10 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 ASTM A387/A387M Grade 91 and IS 4367 10Cr9Mo10?
ASTM A387/A387M Grade 91 specifies V, Nb, N, Al which are not specified for IS 4367 10Cr9Mo10.
Can ASTM A387/A387M Grade 91 be substituted with IS 4367 10Cr9Mo10?
ASTM A387/A387M Grade 91 and IS 4367 10Cr9Mo10 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.