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

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

AS/NZS 3678 Grade 450 (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 450 is typically used for heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment., 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 450 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 450 vs CSA G40.21 400A 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 AS/NZS 3678 Grade 450:
IS 2062 E250A AS/NZS 3679.1 350 AS/NZS 1595 C350 CSA G40.21 300W IS 2062 E250B0 CSA G40.21 350W ASTM A1008 SS Grade 80 AS/NZS 3679.1 300 ASTM A1008 SS Grade 50 ASTM A283C ASTM A572 Gr.65 AS/NZS 1595 C450
Match Breakdown
CHEMISTRY MATCH
93.7%
MECHANICAL MATCH
No shared data
OVERALL
93.7%
Specifications
Property AS/NZS 3678 Grade 450 CSA G40.21 400A
Standard AS/NZS 3678:2016 CSA G40.21-13 (R2023)
Category Structural Steel Structural Steel
C (%) max 0.2 <=0.23
Mn (%) max 1.6 <=1.60
Si (%) max 0.55 <=0.40
P (%) max 0.03 <=0.035
S (%) max 0.03 <=0.035
Cu (%) Not specified 0.20-0.40
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 450 CSA G40.21 400A
Tensile Strength Not specified 520-670 MPa
Yield Strength Not specified 400 MPa min
Elongation Not specified 17% min
Impact Not specified 27J at 0°C
Typical Applications
AS/NZS 3678 Grade 450
Heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.
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
Can AS/NZS 3678 Grade 450 Be Substituted With CSA G40.21 400A?
AS/NZS 3678 Grade 450 and CSA G40.21 400A overlap closely enough on chemistry and mechanical properties that CSA G40.21 400A is often considered as a substitute for AS/NZS 3678 Grade 450 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
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)
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)
On M-EX Right Now
AS/NZS 3678 Grade 450
2 active listings and RFQs →
CSA G40.21 400A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AS/NZS 3678 Grade 450 and CSA G40.21 400A?
CSA G40.21 400A specifies Cu which is not specified for AS/NZS 3678 Grade 450.
Can AS/NZS 3678 Grade 450 be substituted with CSA G40.21 400A?
AS/NZS 3678 Grade 450 and CSA G40.21 400A overlap closely enough on chemistry and mechanical properties that CSA G40.21 400A is often considered as a substitute for AS/NZS 3678 Grade 450 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.