Strong Match — 100% match
based on chemical composition and mechanical property overlap.
AS/NZS 3678 Grade 400 (AS/NZS 3678:2016) and AS/NZS 3678 Grade 450 (AS/NZS 3678:2016) are both steel grades.
Both fall under the Structural Steel category.
AS/NZS 3678 Grade 400 is typically used for heavy structural fabrication, crane booms, mining machinery, earthmoving equipment, structural columns., while AS/NZS 3678 Grade 450 is commonly used for heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment..
AS/NZS 3678 Grade 400 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand, while AS/NZS 3678 Grade 450 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.
As per chemical composition, AS/NZS 3678 Grade 400 vs AS/NZS 3678 Grade 450 is a 100% 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 100%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
AS/NZS 3678 Grade 400
AS/NZS 3678 Grade 450
Yield Strength
400 MPa min (t<=12mm)
Not specified
Tensile Strength
~520 MPa min (approx, equivalent to ASTM A572 Gr.60)
Heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.
Can AS/NZS 3678 Grade 400 Be Substituted With AS/NZS 3678 Grade 450?
AS/NZS 3678 Grade 400 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 AS/NZS 3678 Grade 400 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 AS/NZS 3678 Grade 400 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 AS/NZS 3678 Grade 400 be substituted with AS/NZS 3678 Grade 450?
AS/NZS 3678 Grade 400 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 AS/NZS 3678 Grade 400 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.