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CSA G40.21 50W vs ASTM A588 Grade B

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

CSA G40.21 50W (CSA G40.21-13 (R2023)) and ASTM A588 Grade B (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 B 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 B is defined under ASTM International, originating from United States.

As per chemical composition, CSA G40.21 50W vs ASTM A588 Grade B is a 75.2% match. As per mechanical properties, the match is 33.3%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With CSA G40.21 50W:
CSA G40.21 260WT CSA G40.21 350A ASTM A588 Grade A 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 EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
75.2%
MECHANICAL MATCH
33.3%
OVERALL
35%
Specifications
Property CSA G40.21 50W ASTM A588 Grade B
Standard CSA G40.21-13 (R2023) ASTM A588
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) max 0.19 <=0.20
Mn (%) max 1.35 0.75-1.25
Si (%) max 0.65 0.15-0.30
P (%) max 0.035 <=0.040
S (%) max 0.035 <=0.050
Cu (%) 0.25-0.4 0.20-0.40
Cr (%) 0.4-0.65 0.40-0.70
Ni (%) 0.4-0.7 <=0.50
Mo (%) Not specified 0.02-0.10
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 B
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 B
High-strength low-alloy structural steel with atmospheric corrosion resistance (weathering steel); bridges, transmission/communication towers, gusset plates, exposed structural applications
Key Differences
Can CSA G40.21 50W Be Substituted With ASTM A588 Grade B?
CSA G40.21 50W and ASTM A588 Grade B 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 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)
On M-EX Right Now
CSA G40.21 50W
2 active listings and RFQs →
ASTM A588 Grade B
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between CSA G40.21 50W and ASTM A588 Grade B?
ASTM A588 Grade B specifies Mo which is not specified for CSA G40.21 50W.
Can CSA G40.21 50W be substituted with ASTM A588 Grade B?
CSA G40.21 50W and ASTM A588 Grade B 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.