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ASTM A588 Grade A vs ASTM A959 443

Related Material — 65% match based on chemical composition and mechanical property overlap.

ASTM A588 Grade A (ASTM A588) and ASTM A959 443 (ASTM A959:2011) are both steel grades. ASTM A588 Grade A is classified under Structural Steel (Corten / Weathering), while ASTM A959 443 is classified under Stainless Steel — a different category, which is worth noting alongside the chemistry match below. ASTM A588 Grade A is typically used for high-strength low-alloy structural steel with atmospheric corrosion resistance (weathering steel); bridges, transmission/communication towers, gusset plates, exposed structural applications, while ASTM A959 443 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A588 Grade A is defined under ASTM International, originating from United States, while ASTM A959 443 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A588 Grade A vs ASTM A959 443 is a 74% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 65%.

Frequently Compared With ASTM A588 Grade A:
ASTM A588 CSA G40.21 50W CSA G40.21 260WT EN 10025-5 S355J2W EN 10025-5 S355J2WP JIS G3114 SMA400 CSA G40.21 350A AS/NZS 3678 Grade 350WR EN 10025-5 S355J0WP ASTM A709 Grade HPS 70W CSA G40.21 480A EN 10025-5 S235J2W
Match Breakdown
CHEMISTRY MATCH
74%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property ASTM A588 Grade A ASTM A959 443
Standard ASTM A588 ASTM A959:2011
Category Structural Steel (Corten / Weathering) Stainless Steel
C (%) <=0.19 <=0.20
Mn (%) 0.80-1.25 <=1.00
Si (%) 0.30-0.65 <=1.00
P (%) <=0.040 <=0.040
S (%) <=0.050 <=0.030
Cu (%) 0.25-0.40 0.90-1.25
Cr (%) 0.40-0.65 18.0-23.0
Ni (%) <=0.40 <=0.50
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 Grade A ASTM A959 443
Tensile Strength 485 MPa min Not specified
Yield Strength 345 MPa min Not specified
Elongation 18% min Not specified
Hardness 140-190 HB Not specified
Typical Applications
ASTM A588 Grade A
High-strength low-alloy structural steel with atmospheric corrosion resistance (weathering steel); bridges, transmission/communication towers, gusset plates, exposed structural applications
ASTM A959 443
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can ASTM A588 Grade A Be Substituted With ASTM A959 443?
ASTM A588 Grade A and ASTM A959 443 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 Grade A
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 A959 443
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ASTM A588 Grade A
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ASTM A959 443
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Frequently Asked Questions
What is the difference between ASTM A588 Grade A and ASTM A959 443?
Different category: ASTM A588 Grade A is Structural Steel (Corten / Weathering), ASTM A959 443 is Stainless Steel.
Can ASTM A588 Grade A be substituted with ASTM A959 443?
ASTM A588 Grade A and ASTM A959 443 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.