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ASTM A709 Grade HPS 70W vs AS/NZS 3678 Grade 350WR

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

ASTM A709 Grade HPS 70W (ASTM A709) and AS/NZS 3678 Grade 350WR (AS/NZS 3678:2016) 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 AS/NZS 3678 Grade 350WR is commonly used for weather-resistant (corrosion-resistant) structural steel; exposed bridge and structural applications requiring atmospheric corrosion resistance. ASTM A709 Grade HPS 70W is defined under ASTM International, originating from United States, while AS/NZS 3678 Grade 350WR is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.

As per chemical composition, ASTM A709 Grade HPS 70W vs AS/NZS 3678 Grade 350WR is a 64.6% 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 EN 10025-5 S355J2W ASTM A588 ASTM A588 Grade A CSA G40.21 50W JIS G3114 SMA400 EN 10025-5 S355J2WP CSA G40.21 260WT ASTM A588 Grade B CSA G40.21 480A EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
64.6%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property ASTM A709 Grade HPS 70W AS/NZS 3678 Grade 350WR
Standard ASTM A709 AS/NZS 3678:2016
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) <=0.11 <=0.20
Mn (%) 1.10-1.35 <=1.70
Si (%) 0.30-0.50 <=0.50
P (%) <=0.020 <=0.035
S (%) <=0.006 <=0.035
Cu (%) 0.25-0.40 0.25-0.55
Cr (%) 0.45-0.70 0.40-0.80
Ni (%) 0.70-1.00 <=0.65
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 AS/NZS 3678 Grade 350WR
Tensile Strength 585 MPa min 480-620 MPa
Yield Strength 485 MPa min 350 MPa min
Elongation 19% min 20% min
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
AS/NZS 3678 Grade 350WR
Weather-resistant (corrosion-resistant) structural steel; exposed bridge and structural applications requiring atmospheric corrosion resistance
Key Differences
Can ASTM A709 Grade HPS 70W Be Substituted With AS/NZS 3678 Grade 350WR?
ASTM A709 Grade HPS 70W and AS/NZS 3678 Grade 350WR 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)
AS/NZS 3678 Grade 350WR
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–2800 mm (98.43–110.24 in)
On M-EX Right Now
ASTM A709 Grade HPS 70W
2 active listings and RFQs →
AS/NZS 3678 Grade 350WR
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A709 Grade HPS 70W and AS/NZS 3678 Grade 350WR?
ASTM A709 Grade HPS 70W specifies Mo which is not specified for AS/NZS 3678 Grade 350WR.
Can ASTM A709 Grade HPS 70W be substituted with AS/NZS 3678 Grade 350WR?
ASTM A709 Grade HPS 70W and AS/NZS 3678 Grade 350WR 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.