Minimal Match — 25.4% match
based on chemical composition and mechanical property overlap.
ASTM A387/A387M Grade 91 (ASTM A387/A387M:2011) and NF A35-565 100C6 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 NF A35-565 100C6 is commonly used for ball bearings, roller bearings, bearing races, rollers, precision tools, wear resistant parts.
ASTM A387/A387M Grade 91 is defined under ASTM International, originating from United States, while NF A35-565 100C6 is defined under Association Francaise de Normalisation (NF), originating from France.
As per chemical composition, ASTM A387/A387M Grade 91 vs NF A35-565 100C6 is a 38% match.
As per mechanical properties, the match is 0%.
Combined, this makes them a minimal match overall at 25.4%.
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
NF A35-565 100C6
Tensile Strength
585-760 MPa
850-1100 MPa
Yield Strength
>=415 MPa
Not specified
Elongation
>=18%
Not specified
Condition
Class 2 plates, no thickness ranges printed; elongation in 50 mm gauge length
Not specified
Hardness
Not specified
60-66 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 NF A35-565 100C6.
Can ASTM A387/A387M Grade 91 Be Substituted With NF A35-565 100C6?
ASTM A387/A387M Grade 91 and NF A35-565 100C6 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 NF A35-565 100C6?
ASTM A387/A387M Grade 91 specifies Mo, Ni, V, Nb which are not specified for NF A35-565 100C6.
Can ASTM A387/A387M Grade 91 be substituted with NF A35-565 100C6?
ASTM A387/A387M Grade 91 and NF A35-565 100C6 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.