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ASTM A588

ASTM A588/A588M Specifications

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Scope

ASTM A588/A588M specification covers high-strength low-alloy structural steel shapes, plates, and bars for welded, riveted, or bolted construction but intended primarily for use in welded bridges and buildings where savings in weight or added durability are important. The atmospheric corrosion resistance of ASTM A588/A588M steel in most environments is substantially better than that of carbon structural steels with or without copper addition. When properly exposed to the atmosphere, ASTM A588/A588M steel is suitable for many applications in the bare (unpainted) condition. ASTM A588/A588M specification is limited to material up to 8 in. [200 mm] inclusive in thickness.

Chemical Composition

Element/Composition, %Carbon (C), maxManganese (Mn), maxPhosphorus (P), maxSulfur (S), maxSilicon (Si)Nickel (Ni)Chromium (Cr)Molybdenum (Mo)Copper (Cu), minVanadium (V)Columbium (Nb)
ASTM A588/A588M Grade A0.19 max0.80–1.250.04 max0.05 max0.30–0.650.40 max0.40–0.65…0.25–0.400.02–0.10…
ASTM A588/A588M Grade B0.20 max0.75–1.350.04 max0.05 max0.15–0.500.50 max0.40–0.70…0.20–0.400.01–0.10…
ASTM A588/A588M Grade C0.17 max0.50–1.200.04 max0.05 max0.25–0.500.40 max0.40–0.700.10 max0.30–0.50…0.005–0.05B

Mechanical Properties

TypeTensile strength, min, ksi [MPa]Yield point, min, ksi [MPa]Elongation in 8 in. [200 mm], min, %Elongation in 2 in. [50 mm], min, %

Plates and BarsA

For thicknesses 3⁄4 in.[20 mm], andunder70 [485]50 [345]18B,C21B,C
For thicknesses over3⁄4 to 11⁄2 in. [20 to 40 mm], incl67 [460]46 [315]…21B,C
For thicknesses over11⁄2 to 4 in. [40 to 100 mm], incl63 [435]42 [290]…21B,C
Structural ShapesAll70 [485]50 [345]18C21D
  • Note :
  • A See the Orientation subsection in the Tension Tests section of Specification A6/A6M.
  • B Elongation not required to be determined for floor plate.
  • C For plates wider than 24 in. [600 mm] the elongation requirement is reduced two percentage points.
  • D For wide flange shapes over 426 lb/ft [634 kg/m], elongation in 2 in. [50 mm] of 18 % minimum applies.

Certifications

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103