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CSA G40.21 350A vs ASTM A709 Grade HPS 70W

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

CSA G40.21 350A (CSA G40.21-13 (R2023)) and ASTM A709 Grade HPS 70W (ASTM A709) are both steel grades. Both fall under the Structural Steel (Corten / Weathering) category. CSA G40.21 350A is typically used for exposed structural steelwork, bridges, retaining walls, coastal infrastructure, architectural facades., while ASTM A709 Grade HPS 70W is commonly used for high-performance steel (hps) with enhanced atmospheric corrosion resistance and toughness; primary bridge girders and structural members in bridge construction. CSA G40.21 350A is defined under Canadian Standards Association (CSA), originating from Canada, while ASTM A709 Grade HPS 70W is defined under ASTM International, originating from United States.

As per chemical composition, CSA G40.21 350A vs ASTM A709 Grade HPS 70W is a 68.8% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With CSA G40.21 350A:
ASTM A588 AS/NZS 3678 Grade 350WR EN 10025-5 S355J2WP CSA G40.21 260WT CSA G40.21 50W EN 10025-5 S355J2W JIS G3114 SMA400 EN 10025-5 S355J0WP ASTM A588 Grade A CSA G40.21 480A EN 10025-5 S235J2W ASTM A588 Grade B
Match Breakdown
CHEMISTRY MATCH
68.8%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property CSA G40.21 350A ASTM A709 Grade HPS 70W
Standard CSA G40.21-13 (R2023) ASTM A709
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) max 0.19 <=0.11
Mn (%) max 1.35 1.10-1.35
Si (%) max 0.65 0.30-0.50
P (%) max 0.035 <=0.020
S (%) max 0.035 <=0.006
Cu (%) 0.25-0.4 0.25-0.40
Cr (%) 0.4-0.65 0.45-0.70
Ni (%) 0.4-0.7 0.70-1.00
Mo (%) Not specified 0.02-0.08
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 350A ASTM A709 Grade HPS 70W
Yield Strength 350 MPa min 485 MPa min
Tensile Strength 480-650 MPa 585 MPa min
Elongation Not specified 19% min
Hardness Not specified 170-210 HB
Typical Applications
CSA G40.21 350A
Exposed structural steelwork, bridges, retaining walls, coastal infrastructure, architectural facades.
ASTM A709 Grade HPS 70W
High-performance steel (HPS) with enhanced atmospheric corrosion resistance and toughness; primary bridge girders and structural members in bridge construction
Key Differences
Can CSA G40.21 350A Be Substituted With ASTM A709 Grade HPS 70W?
CSA G40.21 350A and ASTM A709 Grade HPS 70W 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 350A
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3300–3400 mm (129.92–133.86 in)
ASTM A709 Grade HPS 70W
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–3800 mm (98.43–149.61 in)
On M-EX Right Now
CSA G40.21 350A
2 active listings and RFQs →
ASTM A709 Grade HPS 70W
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between CSA G40.21 350A and ASTM A709 Grade HPS 70W?
ASTM A709 Grade HPS 70W specifies Mo which is not specified for CSA G40.21 350A.
Can CSA G40.21 350A be substituted with ASTM A709 Grade HPS 70W?
CSA G40.21 350A and ASTM A709 Grade HPS 70W 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.