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CSA G40.21 400A vs ASTM A572 Grade 50

Related Material — 60.8% match based on chemical composition and mechanical property overlap.

CSA G40.21 400A (CSA G40.21-13 (R2023)) and ASTM A572 Grade 50 (ASTM A572) 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 ASTM A572 Grade 50 is commonly used for high-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication. CSA G40.21 400A is defined under Canadian Standards Association (CSA), originating from Canada, while ASTM A572 Grade 50 is defined under ASTM International, originating from United States.

As per chemical composition, CSA G40.21 400A vs ASTM A572 Grade 50 is a 91.2% match. As per mechanical properties, the match is 0%. Combined, this makes them a related material overall at 60.8%.

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 IS 2062 E250A CSA G40.21 260W CSA G40.21 300W CSA G40.21 400W ASTM A283C IS 2062 E250B0
Match Breakdown
CHEMISTRY MATCH
91.2%
MECHANICAL MATCH
0%
OVERALL
60.8%
Specifications
Property CSA G40.21 400A ASTM A572 Grade 50
Standard CSA G40.21-13 (R2023) ASTM A572
Category Structural Steel Structural Steel
C (%) <=0.23 <=0.23
Mn (%) <=1.60 <=1.35
Si (%) <=0.40 <=0.40
P (%) <=0.035 <=0.040
S (%) <=0.035 <=0.050
Cu (%) 0.20-0.40 Not specified
Nb (%) Not specified <=0.05
V (%) Not specified <=0.15
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 ASTM A572 Grade 50
Tensile Strength 520-670 MPa 450 MPa min
Yield Strength 400 MPa min 345 MPa min
Elongation 17% min 18% min
Impact 27J at 0°C Not specified
Hardness Not specified 137-187 HB
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
ASTM A572 Grade 50
High-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication
Key Differences
Can CSA G40.21 400A Be Substituted With ASTM A572 Grade 50?
CSA G40.21 400A and ASTM A572 Grade 50 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.
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)
ASTM A572 Grade 50
Plate → (4 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2800–4600 mm (110.24–181.1 in)
On M-EX Right Now
CSA G40.21 400A
2 active listings and RFQs →
ASTM A572 Grade 50
4 active listings and RFQs →
Frequently Asked Questions
What is the difference between CSA G40.21 400A and ASTM A572 Grade 50?
CSA G40.21 400A specifies Cu which is not specified for ASTM A572 Grade 50. ASTM A572 Grade 50 specifies Nb, V which are not specified for CSA G40.21 400A.
Can CSA G40.21 400A be substituted with ASTM A572 Grade 50?
CSA G40.21 400A and ASTM A572 Grade 50 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.