Post Stock Login Register

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

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

AS/NZS 3678 Grade 350WR (AS/NZS 3678:2016) and ASTM A709 Grade HPS 70W (ASTM A709) are both steel grades. Both fall under the Structural Steel (Corten / Weathering) category. AS/NZS 3678 Grade 350WR is typically used for weather-resistant (corrosion-resistant) structural steel; exposed bridge and structural applications requiring atmospheric corrosion resistance, 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. AS/NZS 3678 Grade 350WR is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand, while ASTM A709 Grade HPS 70W is defined under ASTM International, originating from United States.

As per chemical composition, AS/NZS 3678 Grade 350WR vs ASTM A709 Grade HPS 70W 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 AS/NZS 3678 Grade 350WR:
EN 10025-5 S355J0WP CSA G40.21 350A ASTM A588 JIS G3114 SMA400 EN 10025-5 S355J2W EN 10025-5 S355J2WP CSA G40.21 50W ASTM A588 Grade A CSA G40.21 260WT CSA G40.21 480A ASTM A588 Grade B EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
64.6%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property AS/NZS 3678 Grade 350WR ASTM A709 Grade HPS 70W
Standard AS/NZS 3678:2016 ASTM A709
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) <=0.20 <=0.11
Mn (%) <=1.70 1.10-1.35
Si (%) <=0.50 0.30-0.50
P (%) <=0.035 <=0.020
S (%) <=0.035 <=0.006
Cu (%) 0.25-0.55 0.25-0.40
Cr (%) 0.40-0.80 0.45-0.70
Ni (%) <=0.65 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 AS/NZS 3678 Grade 350WR ASTM A709 Grade HPS 70W
Tensile Strength 480-620 MPa 585 MPa min
Yield Strength 350 MPa min 485 MPa min
Elongation 20% min 19% min
Hardness Not specified 170-210 HB
Typical Applications
AS/NZS 3678 Grade 350WR
Weather-resistant (corrosion-resistant) structural steel; exposed bridge and structural applications requiring atmospheric corrosion resistance
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 AS/NZS 3678 Grade 350WR Be Substituted With ASTM A709 Grade HPS 70W?
AS/NZS 3678 Grade 350WR 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
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)
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
AS/NZS 3678 Grade 350WR
2 active listings and RFQs →
ASTM A709 Grade HPS 70W
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AS/NZS 3678 Grade 350WR and ASTM A709 Grade HPS 70W?
ASTM A709 Grade HPS 70W specifies Mo which is not specified for AS/NZS 3678 Grade 350WR.
Can AS/NZS 3678 Grade 350WR be substituted with ASTM A709 Grade HPS 70W?
AS/NZS 3678 Grade 350WR 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.