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CSA G40.21 400A vs AS/NZS 3678 Grade 450

Strong Match — 93.7% match based on chemical composition and mechanical property overlap.

CSA G40.21 400A (CSA G40.21-13 (R2023)) and AS/NZS 3678 Grade 450 (AS/NZS 3678:2016) are both steel grades. Both fall under the Structural Steel category. CSA G40.21 400A is typically used for atmospheric corrosion-resistant (weathering) structural steel; exposed bridge girders and structural members where high strength and weathering resistance are both needed, while AS/NZS 3678 Grade 450 is commonly used for heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.. CSA G40.21 400A is defined under Canadian Standards Association (CSA), originating from Canada, while AS/NZS 3678 Grade 450 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.

As per chemical composition, CSA G40.21 400A vs AS/NZS 3678 Grade 450 is a 93.7% 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 93.7%.

Frequently Compared With CSA G40.21 400A:
CSA G40.21 480W CSA G40.21 350W ASTM A1008 SS Grade 50 AS/NZS 1595 C450 ASTM A1008 SS Grade 80 AS/NZS 1595 C350 CSA G40.21 260W CSA G40.21 300W IS 2062 E250A CSA G40.21 400W ASTM A572 Grade 50 IS 2062 E250B0
Match Breakdown
CHEMISTRY MATCH
93.7%
MECHANICAL MATCH
No shared data
OVERALL
93.7%
Specifications
Property CSA G40.21 400A AS/NZS 3678 Grade 450
Standard CSA G40.21-13 (R2023) AS/NZS 3678:2016
Category Structural Steel Structural Steel
C (%) <=0.23 max 0.2
Mn (%) <=1.60 max 1.6
Si (%) <=0.40 max 0.55
P (%) <=0.035 max 0.03
S (%) <=0.035 max 0.03
Cu (%) 0.20-0.40 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property CSA G40.21 400A AS/NZS 3678 Grade 450
Tensile Strength 520-670 MPa Not specified
Yield Strength 400 MPa min Not specified
Elongation 17% min Not specified
Impact 27J at 0°C Not specified
Typical Applications
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
AS/NZS 3678 Grade 450
Heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.
Key Differences
Can CSA G40.21 400A Be Substituted With AS/NZS 3678 Grade 450?
CSA G40.21 400A 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 CSA G40.21 400A in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
CSA G40.21 400A
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2800–4200 mm (110.24–165.35 in)
AS/NZS 3678 Grade 450
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–4200 mm (98.43–165.35 in)
On M-EX Right Now
CSA G40.21 400A
2 active listings and RFQs →
AS/NZS 3678 Grade 450
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between CSA G40.21 400A and AS/NZS 3678 Grade 450?
CSA G40.21 400A specifies Cu which is not specified for AS/NZS 3678 Grade 450.
Can CSA G40.21 400A be substituted with AS/NZS 3678 Grade 450?
CSA G40.21 400A 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 CSA G40.21 400A in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.