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

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

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

As per chemical composition, ASTM A709 Grade HPS 70W vs CSA G40.21 350A 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 ASTM A709 Grade HPS 70W:
EN 10025-5 S355J0WP ASTM A588 ASTM A588 Grade A EN 10025-5 S355J2W JIS G3114 SMA400 CSA G40.21 50W AS/NZS 3678 Grade 350WR CSA G40.21 260WT EN 10025-5 S355J2WP ASTM A588 Grade B CSA G40.21 480A EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
68.8%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property ASTM A709 Grade HPS 70W CSA G40.21 350A
Standard ASTM A709 CSA G40.21-13 (R2023)
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) <=0.11 max 0.19
Mn (%) 1.10-1.35 max 1.35
Si (%) 0.30-0.50 max 0.65
P (%) <=0.020 max 0.035
S (%) <=0.006 max 0.035
Cu (%) 0.25-0.40 0.25-0.4
Cr (%) 0.45-0.70 0.4-0.65
Ni (%) 0.70-1.00 0.4-0.7
Mo (%) 0.02-0.08 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 A709 Grade HPS 70W CSA G40.21 350A
Tensile Strength 585 MPa min 480-650 MPa
Yield Strength 485 MPa min 350 MPa min
Elongation 19% min Not specified
Hardness 170-210 HB Not specified
Typical Applications
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
CSA G40.21 350A
Exposed structural steelwork, bridges, retaining walls, coastal infrastructure, architectural facades.
Key Differences
Can ASTM A709 Grade HPS 70W Be Substituted With CSA G40.21 350A?
ASTM A709 Grade HPS 70W and CSA G40.21 350A 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 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)
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)
On M-EX Right Now
ASTM A709 Grade HPS 70W
2 active listings and RFQs →
CSA G40.21 350A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A709 Grade HPS 70W and CSA G40.21 350A?
ASTM A709 Grade HPS 70W specifies Mo which is not specified for CSA G40.21 350A.
Can ASTM A709 Grade HPS 70W be substituted with CSA G40.21 350A?
ASTM A709 Grade HPS 70W and CSA G40.21 350A 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.