Strong Match — 95.8% match
based on chemical composition and mechanical property overlap.
ASTM A572/A572M Grade 55 (ASTM A572/A572M:2018) and AS/NZS 3678 Grade 450 (AS/NZS 3678:2016) are both steel grades.
Both fall under the Structural Steel category.
ASTM A572/A572M Grade 55 is typically used for riveted, bolted or welded structures, while AS/NZS 3678 Grade 450 is commonly used for heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment..
ASTM A572/A572M Grade 55 is defined under ASTM International, originating from United States, while AS/NZS 3678 Grade 450 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.
As per chemical composition, ASTM A572/A572M Grade 55 vs AS/NZS 3678 Grade 450 is a 95.8% 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 95.8%.
Frequently Compared With ASTM A572/A572M Grade 55:
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
ASTM A572/A572M Grade 55
AS/NZS 3678 Grade 450
Tensile Strength
>=485 MPa
Not specified
Yield Strength
>=380 MPa
Not specified
Elongation
>=17%
Not specified
Condition
Tension test per Table 4; one set of minimum values for all product thicknesses; Elongation is in 200 mm gauge length, 50 mm values in the tensile block
Not specified
Typical Applications
ASTM A572/A572M Grade 55
Riveted, bolted or welded structures
AS/NZS 3678 Grade 450
Heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.
Can ASTM A572/A572M Grade 55 Be Substituted With AS/NZS 3678 Grade 450?
ASTM A572/A572M Grade 55 and AS/NZS 3678 Grade 450 overlap closely enough on chemistry and mechanical properties that AS/NZS 3678 Grade 450 is often considered as a substitute for ASTM A572/A572M Grade 55 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 ASTM A572/A572M Grade 55 and AS/NZS 3678 Grade 450?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A572/A572M Grade 55 be substituted with AS/NZS 3678 Grade 450?
ASTM A572/A572M Grade 55 and AS/NZS 3678 Grade 450 overlap closely enough on chemistry and mechanical properties that AS/NZS 3678 Grade 450 is often considered as a substitute for ASTM A572/A572M Grade 55 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.