Minimal Match — 25.7% match
based on chemical composition and mechanical property overlap.
ASTM A387/A387M Grade 91 (ASTM A387/A387M:2011) and UNI 11234 100Cr6 (UNI 11234:2007) are both steel grades.
Both fall under the Alloy Steel category.
ASTM A387/A387M Grade 91 is typically used for welded boilers and pressure vessels for elevated temperature service, while UNI 11234 100Cr6 is commonly used for ball bearings,roller bearings,needle bearings,dies,punches,gauges,wear resistant components.
ASTM A387/A387M Grade 91 is defined under ASTM International, originating from United States, while UNI 11234 100Cr6 is defined under Ente Nazionale Italiano di Unificazione (UNI), originating from Italy.
As per chemical composition, ASTM A387/A387M Grade 91 vs UNI 11234 100Cr6 is a 38.2% match.
As per mechanical properties, the match is 0.8%.
Combined, this makes them a minimal match overall at 25.7%.
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
UNI 11234 100Cr6
Tensile Strength
585-760 MPa
750-1000 MPa
Yield Strength
>=415 MPa
400-600 MPa
Elongation
>=18%
10-14 %
Condition
Class 2 plates, no thickness ranges printed; elongation in 50 mm gauge length
Not specified
Hardness
Not specified
60-64 HRC
Typical Applications
ASTM A387/A387M Grade 91
Welded boilers and pressure vessels for elevated temperature service
ASTM A387/A387M Grade 91 specifies Mo, Ni, V, Nb which are not specified for UNI 11234 100Cr6.
Can ASTM A387/A387M Grade 91 Be Substituted With UNI 11234 100Cr6?
ASTM A387/A387M Grade 91 and UNI 11234 100Cr6 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 UNI 11234 100Cr6?
ASTM A387/A387M Grade 91 specifies Mo, Ni, V, Nb which are not specified for UNI 11234 100Cr6.
Can ASTM A387/A387M Grade 91 be substituted with UNI 11234 100Cr6?
ASTM A387/A387M Grade 91 and UNI 11234 100Cr6 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.