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ASTM A709 Grade HPS 70W vs CSA G40.21 260WT

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

ASTM A709 Grade HPS 70W (ASTM A709) and CSA G40.21 260WT (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 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 A709 Grade HPS 70W 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 A709 Grade HPS 70W vs CSA G40.21 260WT is a 66.1% 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:
CSA G40.21 350A 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 EN 10025-5 S355J2WP ASTM A588 Grade B CSA G40.21 480A EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
66.1%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property ASTM A709 Grade HPS 70W CSA G40.21 260WT
Standard ASTM A709 CSA G40.21-13 (R2023)
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) <=0.11 <=0.20
Mn (%) 1.10-1.35 <=1.35
Si (%) 0.30-0.50 <=0.40
P (%) <=0.020 <=0.035
S (%) <=0.006 <=0.035
Cu (%) 0.25-0.40 0.20-0.40
Cr (%) 0.45-0.70 0.40-0.65
Ni (%) 0.70-1.00 <=0.40
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 260WT
Tensile Strength 585 MPa min 380-480 MPa
Yield Strength 485 MPa min 260 MPa min
Elongation 19% min 23% min
Hardness 170-210 HB Not specified
Impact Not specified 27J at -20°C
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 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 A709 Grade HPS 70W Be Substituted With CSA G40.21 260WT?
ASTM A709 Grade HPS 70W 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 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 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 A709 Grade HPS 70W
2 active listings and RFQs →
CSA G40.21 260WT
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A709 Grade HPS 70W and CSA G40.21 260WT?
ASTM A709 Grade HPS 70W specifies Mo which is not specified for CSA G40.21 260WT.
Can ASTM A709 Grade HPS 70W be substituted with CSA G40.21 260WT?
ASTM A709 Grade HPS 70W 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.