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ASTM A572 Grade 50 vs CSA G40.21 400A

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

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

As per chemical composition, ASTM A572 Grade 50 vs CSA G40.21 400A 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 ASTM A572 Grade 50:
ASTM A572 Gr.65 ASTM A283C GOST 19281 09G2S CSA G40.21 260W CSA G40.21 300W AS/NZS 3679.1 300 AS/NZS 3679.1 350 CSA G40.21 480W CSA G40.21 400W CSA G40.21 350W ASTM A1008 SS Grade 50 ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
91.2%
MECHANICAL MATCH
0%
OVERALL
60.8%
Specifications
Property ASTM A572 Grade 50 CSA G40.21 400A
Standard ASTM A572 CSA G40.21-13 (R2023)
Category Structural Steel Structural Steel
C (%) <=0.23 <=0.23
Mn (%) <=1.35 <=1.60
Si (%) <=0.40 <=0.40
P (%) <=0.040 <=0.035
S (%) <=0.050 <=0.035
Nb (%) <=0.05 Not specified
V (%) <=0.15 Not specified
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 ASTM A572 Grade 50 CSA G40.21 400A
Tensile Strength 450 MPa min 520-670 MPa
Yield Strength 345 MPa min 400 MPa min
Elongation 18% min 17% min
Hardness 137-187 HB Not specified
Impact Not specified 27J at 0°C
Typical Applications
ASTM A572 Grade 50
High-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication
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 ASTM A572 Grade 50 Be Substituted With CSA G40.21 400A?
ASTM A572 Grade 50 and CSA G40.21 400A 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
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)
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
ASTM A572 Grade 50
4 active listings and RFQs →
CSA G40.21 400A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A572 Grade 50 and CSA G40.21 400A?
ASTM A572 Grade 50 specifies Nb, V which are not specified for CSA G40.21 400A. CSA G40.21 400A specifies Cu which is not specified for ASTM A572 Grade 50.
Can ASTM A572 Grade 50 be substituted with CSA G40.21 400A?
ASTM A572 Grade 50 and CSA G40.21 400A 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.