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CSA G40.21 50W vs ASTM A709 Grade HPS 70W

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

CSA G40.21 50W (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 50W is typically used for bridges, architectural structures, transmission towers, outdoor exposed structures, railway wagons., 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 50W 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 50W vs ASTM A709 Grade HPS 70W is a 68.8% 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 ASTM A588 Grade A CSA G40.21 350A AS/NZS 3678 Grade 350WR EN 10025-5 S355J2W ASTM A588 EN 10025-5 S355J0WP EN 10025-5 S355J2WP JIS G3114 SMA400 CSA G40.21 480A ASTM A588 Grade B EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
68.8%
MECHANICAL MATCH
33.3%
OVERALL
35%
Specifications
Property CSA G40.21 50W 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 50W ASTM A709 Grade HPS 70W
Yield Strength 345 MPa (50 ksi) min 485 MPa min
Tensile Strength 450-655 MPa (65-95 ksi) 585 MPa min
Elongation 19% min 19% min
Hardness Not specified 170-210 HB
Typical Applications
CSA G40.21 50W
Bridges, architectural structures, transmission towers, outdoor exposed structures, railway wagons.
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 50W Be Substituted With ASTM A709 Grade HPS 70W?
CSA G40.21 50W 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 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 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 50W
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 50W and ASTM A709 Grade HPS 70W?
ASTM A709 Grade HPS 70W specifies Mo which is not specified for CSA G40.21 50W.
Can CSA G40.21 50W be substituted with ASTM A709 Grade HPS 70W?
CSA G40.21 50W 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.