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CSA G40.21 50W vs ASTM A588

Close Alternative — 73.3% match based on chemical composition and mechanical property overlap.

CSA G40.21 50W (CSA G40.21-13 (R2023)) and ASTM A588 (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 is commonly used for used for bridges, railway wagons, transmission poles, architectural structures, containers, and outdoor construction.. CSA G40.21 50W is defined under Canadian Standards Association (CSA), originating from Canada, while ASTM A588 is defined under ASTM International, originating from United States.

As per chemical composition, CSA G40.21 50W vs ASTM A588 is a 81.4% match. As per mechanical properties, the match is 56.9%. Combined, this makes them a close alternative overall at 73.3%.

Frequently Compared With CSA G40.21 50W:
CSA G40.21 260WT ASTM A588 Grade A CSA G40.21 350A AS/NZS 3678 Grade 350WR EN 10025-5 S355J2W EN 10025-5 S355J0WP 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
81.4%
MECHANICAL MATCH
56.9%
OVERALL
73.3%
Specifications
Property CSA G40.21 50W ASTM A588
Standard CSA G40.21-13 (R2023) ASTM A588
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) max 0.19 0.19 max
Mn (%) max 1.35 0.80-1.25
Si (%) max 0.65 0.30-0.65
P (%) max 0.035 0.04 max
S (%) max 0.035 0.05 max
Cu (%) 0.25-0.4 0.20-0.40
Cr (%) 0.4-0.65 0.40-0.70
Ni (%) 0.4-0.7 0.40 max
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
Yield Strength 345 MPa (50 ksi) min 345 MPa min
Tensile Strength 450-655 MPa (65-95 ksi) 485-630 MPa
Elongation 19% min 18-21%
Hardness Not specified 140-190 HB
Typical Applications
CSA G40.21 50W
Bridges, architectural structures, transmission towers, outdoor exposed structures, railway wagons.
ASTM A588
Used for bridges, railway wagons, transmission poles, architectural structures, containers, and outdoor construction.
Can CSA G40.21 50W Be Substituted With ASTM A588?
CSA G40.21 50W and ASTM A588 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 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
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
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between CSA G40.21 50W and ASTM A588?
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?
CSA G40.21 50W and ASTM A588 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.