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ASTM A588 vs ASTM A709 Grade HPS 70W

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

ASTM A588 (ASTM A588) and ASTM A709 Grade HPS 70W (ASTM A709) are both steel grades. Both fall under the Structural Steel (Corten / Weathering) category. ASTM A588 is typically used for used for bridges, railway wagons, transmission poles, architectural structures, containers, and outdoor construction., 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. ASTM A588 is defined under ASTM International, originating from United States, while ASTM A709 Grade HPS 70W is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A588 vs ASTM A709 Grade HPS 70W is a 69.5% match. As per mechanical properties, the match is 7.1%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With ASTM A588:
EN 10025-5 S355J2W CSA G40.21 350A ASTM A588 Grade A AS/NZS 3678 Grade 350WR EN 10025-5 S355J0WP JIS G3114 SMA400 CSA G40.21 260WT EN 10025-5 S355J2WP CSA G40.21 50W ASTM A588 Grade B CSA G40.21 480A EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
69.5%
MECHANICAL MATCH
7.1%
OVERALL
35%
Specifications
Property ASTM A588 ASTM A709 Grade HPS 70W
Standard ASTM A588 ASTM A709
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) 0.19 max <=0.11
Mn (%) 0.80-1.25 1.10-1.35
Si (%) 0.30-0.65 0.30-0.50
Cu (%) 0.20-0.40 0.25-0.40
Cr (%) 0.40-0.70 0.45-0.70
Ni (%) 0.40 max 0.70-1.00
P (%) 0.04 max <=0.020
S (%) 0.05 max <=0.006
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 ASTM A588 ASTM A709 Grade HPS 70W
Tensile Strength 485-630 MPa 585 MPa min
Yield Strength 345 MPa min 485 MPa min
Elongation 18-21% 19% min
Hardness 140-190 HB 170-210 HB
Typical Applications
ASTM A588
Used for bridges, railway wagons, transmission poles, architectural structures, containers, and outdoor construction.
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 ASTM A588 Be Substituted With ASTM A709 Grade HPS 70W?
ASTM A588 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
ASTM A588
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–2700 mm (98.43–106.3 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
ASTM A588
2 active listings and RFQs →
ASTM A709 Grade HPS 70W
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A588 and ASTM A709 Grade HPS 70W?
ASTM A709 Grade HPS 70W specifies Mo which is not specified for ASTM A588.
Can ASTM A588 be substituted with ASTM A709 Grade HPS 70W?
ASTM A588 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.