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CSA G40.21 260WT vs ASTM A588 Grade A

Related Material — 58.8% match based on chemical composition and mechanical property overlap.

CSA G40.21 260WT (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 260WT is typically used for weldable structural steel with guaranteed charpy v-notch low-temperature toughness; secondary members, stair stringers, bracing in cold-climate service, 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 260WT 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 260WT vs ASTM A588 Grade A is a 88.2% match. As per mechanical properties, the match is 0%. Combined, this makes them a related material overall at 58.8%.

Frequently Compared With CSA G40.21 260WT:
CSA G40.21 350A CSA G40.21 50W ASTM A588 JIS G3114 SMA400 EN 10025-5 S355J2W AS/NZS 3678 Grade 350WR EN 10025-5 S355J0WP EN 10025-5 S355J2WP ASTM A588 Grade B ASTM A709 Grade HPS 70W EN 10025-5 S235J2W CSA G40.21 480A
Match Breakdown
CHEMISTRY MATCH
88.2%
MECHANICAL MATCH
0%
OVERALL
58.8%
Specifications
Property CSA G40.21 260WT ASTM A588 Grade A
Standard CSA G40.21-13 (R2023) ASTM A588
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) <=0.20 <=0.19
Mn (%) <=1.35 0.80-1.25
Si (%) <=0.40 0.30-0.65
P (%) <=0.035 <=0.040
S (%) <=0.035 <=0.050
Cu (%) 0.20-0.40 0.25-0.40
Cr (%) 0.40-0.65 0.40-0.65
Ni (%) <=0.40 <=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 260WT ASTM A588 Grade A
Tensile Strength 380-480 MPa 485 MPa min
Yield Strength 260 MPa min 345 MPa min
Elongation 23% min 18% min
Impact 27J at -20°C Not specified
Hardness Not specified 140-190 HB
Typical Applications
CSA G40.21 260WT
Weldable structural steel with guaranteed Charpy V-notch low-temperature toughness; secondary members, stair stringers, bracing in cold-climate service
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 260WT Be Substituted With ASTM A588 Grade A?
CSA G40.21 260WT 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 260WT
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2600–2900 mm (102.36–114.17 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 260WT
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 260WT 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 260WT be substituted with ASTM A588 Grade A?
CSA G40.21 260WT 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.