Post Stock Login Register

CSA G40.21 50W vs ASTM A588 Grade A

Related Material — 67.6% match based on chemical composition and mechanical property overlap.

CSA G40.21 50W (CSA G40.21-13 (R2023)) and ASTM A588 Grade A (ASTM A588) are both steel grades. Both fall under the Structural Steel (Corten / Weathering) category. CSA G40.21 50W is typically used for bridges, architectural structures, transmission towers, outdoor exposed structures, railway wagons., while ASTM A588 Grade A is commonly used for high-strength low-alloy structural steel with atmospheric corrosion resistance (weathering steel); bridges, transmission/communication towers, gusset plates, exposed structural applications. CSA G40.21 50W is defined under Canadian Standards Association (CSA), originating from Canada, while ASTM A588 Grade A is defined under ASTM International, originating from United States.

As per chemical composition, CSA G40.21 50W vs ASTM A588 Grade A is a 84.7% match. As per mechanical properties, the match is 33.3%. Combined, this makes them a related material overall at 67.6%.

Frequently Compared With CSA G40.21 50W:
CSA G40.21 260WT CSA G40.21 350A AS/NZS 3678 Grade 350WR EN 10025-5 S355J2W EN 10025-5 S355J0WP ASTM A588 EN 10025-5 S355J2WP ASTM A709 Grade HPS 70W CSA G40.21 480A JIS G3114 SMA400 ASTM A588 Grade B EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
84.7%
MECHANICAL MATCH
33.3%
OVERALL
67.6%
Specifications
Property CSA G40.21 50W ASTM A588 Grade A
Standard CSA G40.21-13 (R2023) ASTM A588
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) max 0.19 <=0.19
Mn (%) max 1.35 0.80-1.25
Si (%) max 0.65 0.30-0.65
P (%) max 0.035 <=0.040
S (%) max 0.035 <=0.050
Cu (%) 0.25-0.4 0.25-0.40
Cr (%) 0.4-0.65 0.40-0.65
Ni (%) 0.4-0.7 <=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 CSA G40.21 50W ASTM A588 Grade A
Yield Strength 345 MPa (50 ksi) min 345 MPa min
Tensile Strength 450-655 MPa (65-95 ksi) 485 MPa min
Elongation 19% min 18% min
Hardness Not specified 140-190 HB
Typical Applications
CSA G40.21 50W
Bridges, architectural structures, transmission towers, outdoor exposed structures, railway wagons.
ASTM A588 Grade A
High-strength low-alloy structural steel with atmospheric corrosion resistance (weathering steel); bridges, transmission/communication towers, gusset plates, exposed structural applications
Can CSA G40.21 50W Be Substituted With ASTM A588 Grade A?
CSA G40.21 50W and ASTM A588 Grade A 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 50W
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2700–4300 mm (106.3–169.29 in)
ASTM A588 Grade A
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–2700 mm (98.43–106.3 in)
On M-EX Right Now
CSA G40.21 50W
2 active listings and RFQs →
ASTM A588 Grade A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between CSA G40.21 50W and ASTM A588 Grade A?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can CSA G40.21 50W be substituted with ASTM A588 Grade A?
CSA G40.21 50W and ASTM A588 Grade A 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.