Related Material — 64.9% match
based on chemical composition and mechanical property overlap.
AS/NZS 3678 Grade 300 (AS/NZS 3678:2016) and CSA G40.21 400A (CSA G40.21-13 (R2023)) are both steel grades.
Both fall under the Structural Steel category.
AS/NZS 3678 Grade 300 is typically used for general fabrication, structural members, high-rise buildings, bridges, storage tanks, while CSA G40.21 400A is commonly used for atmospheric corrosion-resistant (weathering) structural steel; exposed bridge girders and structural members where high strength and weathering resistance are both needed.
AS/NZS 3678 Grade 300 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand, while CSA G40.21 400A is defined under Canadian Standards Association (CSA), originating from Canada.
As per chemical composition, AS/NZS 3678 Grade 300 vs CSA G40.21 400A is a 94.6% match.
As per mechanical properties, the match is 5.6%.
Combined, this makes them a related material overall at 64.9%.
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 300
CSA G40.21 400A
Tensile Strength
430-560 MPa
520-670 MPa
Yield Strength
300 MPa min
400 MPa min
Elongation
22% min
17% min
Impact
Not specified
27J at 0°C
Typical Applications
AS/NZS 3678 Grade 300
General fabrication, structural members, high-rise buildings, bridges, storage tanks
CSA G40.21 400A
Atmospheric corrosion-resistant (weathering) structural steel; exposed bridge girders and structural members where high strength and weathering resistance are both needed
Key Differences
CSA G40.21 400A specifies Cu which is not specified for AS/NZS 3678 Grade 300.
Can AS/NZS 3678 Grade 300 Be Substituted With CSA G40.21 400A?
AS/NZS 3678 Grade 300 and CSA G40.21 400A 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 AS/NZS 3678 Grade 300 and CSA G40.21 400A?
CSA G40.21 400A specifies Cu which is not specified for AS/NZS 3678 Grade 300.
Can AS/NZS 3678 Grade 300 be substituted with CSA G40.21 400A?
AS/NZS 3678 Grade 300 and CSA G40.21 400A 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.