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

Close Alternative — 79.1% match based on chemical composition and mechanical property overlap.

CSA G40.21 400A (CSA G40.21-13 (R2023)) and AS/NZS 3678 Grade 400 (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 400 is commonly used for heavy structural fabrication, crane booms, mining machinery, earthmoving equipment, structural columns.. CSA G40.21 400A is defined under Canadian Standards Association (CSA), originating from Canada, while AS/NZS 3678 Grade 400 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 400 is a 93.7% match. As per mechanical properties, the match is 50%. Combined, this makes them a close alternative overall at 79.1%.

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
50%
OVERALL
79.1%
Specifications
Property CSA G40.21 400A AS/NZS 3678 Grade 400
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 400
Tensile Strength 520-670 MPa ~520 MPa min (approx, equivalent to ASTM A572 Gr.60)
Yield Strength 400 MPa min 400 MPa min (t<=12mm)
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 400
Heavy structural fabrication, crane booms, mining machinery, earthmoving equipment, structural columns.
Key Differences
Can CSA G40.21 400A Be Substituted With AS/NZS 3678 Grade 400?
CSA G40.21 400A and AS/NZS 3678 Grade 400 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
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 400
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3000–3700 mm (118.11–145.67 in)
On M-EX Right Now
CSA G40.21 400A
2 active listings and RFQs →
AS/NZS 3678 Grade 400
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between CSA G40.21 400A and AS/NZS 3678 Grade 400?
CSA G40.21 400A specifies Cu which is not specified for AS/NZS 3678 Grade 400.
Can CSA G40.21 400A be substituted with AS/NZS 3678 Grade 400?
CSA G40.21 400A and AS/NZS 3678 Grade 400 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.