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ASTM A709 Grade HPS 70W vs ASTM A588 Grade B

Minimal Match — 48.5% match based on chemical composition and mechanical property overlap.

ASTM A709 Grade HPS 70W (ASTM A709) and ASTM A588 Grade B (ASTM A588) 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 ASTM A588 Grade B is commonly used for high-strength low-alloy structural steel with atmospheric corrosion resistance (weathering steel); bridges, transmission/communication towers, gusset plates, exposed structural applications. ASTM A709 Grade HPS 70W is defined under ASTM International, originating from United States, while ASTM A588 Grade B is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A709 Grade HPS 70W vs ASTM A588 Grade B is a 69.1% match. As per mechanical properties, the match is 7.1%. Combined, this makes them a minimal match overall at 48.5%.

Frequently Compared With ASTM A709 Grade HPS 70W:
CSA G40.21 350A EN 10025-5 S355J0WP ASTM A588 EN 10025-5 S355J2W ASTM A588 Grade A JIS G3114 SMA400 CSA G40.21 50W AS/NZS 3678 Grade 350WR EN 10025-5 S355J2WP CSA G40.21 260WT CSA G40.21 480A EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
69.1%
MECHANICAL MATCH
7.1%
OVERALL
48.5%
Specifications
Property ASTM A709 Grade HPS 70W ASTM A588 Grade B
Standard ASTM A709 ASTM A588
Category Structural Steel (Corten / Weathering) Structural Steel (Corten / Weathering)
C (%) <=0.11 <=0.20
Mn (%) 1.10-1.35 0.75-1.25
Si (%) 0.30-0.50 0.15-0.30
P (%) <=0.020 <=0.040
S (%) <=0.006 <=0.050
Cu (%) 0.25-0.40 0.20-0.40
Cr (%) 0.45-0.70 0.40-0.70
Ni (%) 0.70-1.00 <=0.50
Mo (%) 0.02-0.08 0.02-0.10
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 ASTM A588 Grade B
Tensile Strength 585 MPa min 485 MPa min
Yield Strength 485 MPa min 345 MPa min
Elongation 19% min 18% min
Hardness 170-210 HB 140-190 HB
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
ASTM A588 Grade B
High-strength low-alloy structural steel with atmospheric corrosion resistance (weathering steel); bridges, transmission/communication towers, gusset plates, exposed structural applications
Can ASTM A709 Grade HPS 70W Be Substituted With ASTM A588 Grade B?
ASTM A709 Grade HPS 70W and ASTM A588 Grade B 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)
ASTM A588 Grade B
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3100–3200 mm (122.05–125.98 in)
On M-EX Right Now
ASTM A709 Grade HPS 70W
2 active listings and RFQs →
ASTM A588 Grade B
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A709 Grade HPS 70W and ASTM A588 Grade B?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A709 Grade HPS 70W be substituted with ASTM A588 Grade B?
ASTM A709 Grade HPS 70W and ASTM A588 Grade B 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.