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

Strong Match — 97.5% match based on chemical composition and mechanical property overlap.

CSA G40.21 400W (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 400W is typically used for heavy structural fabrication, bridges, offshore platforms, cranes, pressure vessels, mining equipment., 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 400W 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 400W vs AS/NZS 3678 Grade 450 is a 97.5% 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 97.5%.

Frequently Compared With CSA G40.21 400W:
AS/NZS 1595 C450 CSA G40.21 300W AS/NZS 3679.1 300 AS/NZS 3679.1 350 ASTM A1008 SS Grade 80 IS 2062 E250A IS 2062 E250B0 GOST 19281 09G2S AS/NZS 1595 C350 ASTM A1008 SS Grade 50 CSA G40.21 350W CSA G40.21 400A
Match Breakdown
CHEMISTRY MATCH
97.5%
MECHANICAL MATCH
No shared data
OVERALL
97.5%
Specifications
Property CSA G40.21 400W AS/NZS 3678 Grade 450
Standard CSA G40.21-13 (R2023) AS/NZS 3678:2016
Category Structural Steel Structural Steel
C (%) max 0.23 max 0.2
Mn (%) max 1.6 max 1.6
Si (%) max 0.5 max 0.55
P (%) max 0.035 max 0.03
S (%) max 0.035 max 0.03
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 400W AS/NZS 3678 Grade 450
Yield Strength 400 MPa min Not specified
Tensile Strength 520-690 MPa Not specified
Typical Applications
CSA G40.21 400W
Heavy structural fabrication, bridges, offshore platforms, cranes, pressure vessels, mining equipment.
AS/NZS 3678 Grade 450
Heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.
Can CSA G40.21 400W Be Substituted With AS/NZS 3678 Grade 450?
CSA G40.21 400W 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 400W 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 400W
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–5200 mm (98.43–204.72 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 400W
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 400W 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 CSA G40.21 400W be substituted with AS/NZS 3678 Grade 450?
CSA G40.21 400W 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 400W in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.