Close Alternative — 74.3% match
based on chemical composition and mechanical property overlap.
ASTM A572/A572M Grade 55 (ASTM A572/A572M:2018) and CSA G40.21 400A (CSA G40.21-13 (R2023)) are both steel grades.
Both fall under the Structural Steel category.
ASTM A572/A572M Grade 55 is typically used for riveted, bolted or welded structures, 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/A572M Grade 55 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/A572M Grade 55 vs CSA G40.21 400A is a 94.7% match.
As per mechanical properties, the match is 33.3%.
Combined, this makes them a close alternative overall at 74.3%.
Frequently Compared With ASTM A572/A572M Grade 55:
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/A572M Grade 55
CSA G40.21 400A
Tensile Strength
>=485 MPa
520-670 MPa
Yield Strength
>=380 MPa
400 MPa min
Elongation
>=17%
17% min
Condition
Tension test per Table 4; one set of minimum values for all product thicknesses; Elongation is in 200 mm gauge length, 50 mm values in the tensile block
Not specified
Impact
Not specified
27J at 0°C
Typical Applications
ASTM A572/A572M Grade 55
Riveted, bolted or welded structures
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
CSA G40.21 400A specifies Cu which is not specified for ASTM A572/A572M Grade 55.
Can ASTM A572/A572M Grade 55 Be Substituted With CSA G40.21 400A?
ASTM A572/A572M Grade 55 and CSA G40.21 400A 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.
What is the difference between ASTM A572/A572M Grade 55 and CSA G40.21 400A?
CSA G40.21 400A specifies Cu which is not specified for ASTM A572/A572M Grade 55.
Can ASTM A572/A572M Grade 55 be substituted with CSA G40.21 400A?
ASTM A572/A572M Grade 55 and CSA G40.21 400A 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.