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ASTM A588 Grade B vs CSA G40.21 260WT

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

ASTM A588 Grade B (ASTM A588) and CSA G40.21 260WT (CSA G40.21-13 (R2023)) are both steel grades. Both fall under the Structural Steel (Corten / Weathering) category. ASTM A588 Grade B is typically used for high-strength low-alloy structural steel with atmospheric corrosion resistance (weathering steel); bridges, transmission/communication towers, gusset plates, exposed structural applications, while CSA G40.21 260WT is commonly used for weldable structural steel with guaranteed charpy v-notch low-temperature toughness; secondary members, stair stringers, bracing in cold-climate service. ASTM A588 Grade B is defined under ASTM International, originating from United States, while CSA G40.21 260WT is defined under Canadian Standards Association (CSA), originating from Canada.

As per chemical composition, ASTM A588 Grade B vs CSA G40.21 260WT is a 83.5% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With ASTM A588 Grade B:
ASTM A588 EN 10025-5 S355J2W EN 10025-5 S355J0WP JIS G3114 SMA400 CSA G40.21 350A ASTM A588 Grade A AS/NZS 3678 Grade 350WR EN 10025-5 S355J2WP CSA G40.21 50W CSA G40.21 480A ASTM A709 Grade HPS 70W EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
83.5%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property ASTM A588 Grade B CSA G40.21 260WT
Standard ASTM A588 CSA G40.21-13 (R2023)
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) <=0.20 <=0.20
Mn (%) 0.75-1.25 <=1.35
Si (%) 0.15-0.30 <=0.40
P (%) <=0.040 <=0.035
S (%) <=0.050 <=0.035
Cu (%) 0.20-0.40 0.20-0.40
Cr (%) 0.40-0.70 0.40-0.65
Ni (%) <=0.50 <=0.40
Mo (%) 0.02-0.10 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A588 Grade B CSA G40.21 260WT
Tensile Strength 485 MPa min 380-480 MPa
Yield Strength 345 MPa min 260 MPa min
Elongation 18% min 23% min
Hardness 140-190 HB Not specified
Impact Not specified 27J at -20°C
Typical Applications
ASTM A588 Grade B
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
Weldable structural steel with guaranteed Charpy V-notch low-temperature toughness; secondary members, stair stringers, bracing in cold-climate service
Key Differences
Can ASTM A588 Grade B Be Substituted With CSA G40.21 260WT?
ASTM A588 Grade B and CSA G40.21 260WT 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 A588 Grade B
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3100–3200 mm (122.05–125.98 in)
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)
On M-EX Right Now
ASTM A588 Grade B
2 active listings and RFQs →
CSA G40.21 260WT
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A588 Grade B and CSA G40.21 260WT?
ASTM A588 Grade B specifies Mo which is not specified for CSA G40.21 260WT.
Can ASTM A588 Grade B be substituted with CSA G40.21 260WT?
ASTM A588 Grade B and CSA G40.21 260WT 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.