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A High Strength, Low Alloy Copper Bearing Grade
 

A-588

Overview

A high-strength / low alloy copper bearing grade with a 50,000 minimum yield. The added copper enhances the corrosion resistance through a weathering process. Used primarily in bridges and other construction areas where durability and added strength are needed in an open air atmosphere.

Chemical Requirements

Note - Where "-" appears in this table, there is no requirement.

ElementComposition %
Grade AGrade BGrade K
CarbonA 0.19 max 0.20 max 0.17 max
ManganeseA 0.80-1.25 0.75-1.35 0.50-1.20
Phosphorus 0.04 max 0.04 max 0.04 max
Sulfur 0.05 max 0.05 max 0.05 max
Silicon 0.30-0.65 0.15-0.50 0.25-0.50
Nickel 0.40 max 0.50 max 0.40 max
Chromium 0.40-0.65 0.40-0.70 0.40-0.70
Molybdenum - - 0.10 max
Copper 0.25-0.40 0.20-0.40 0.30-0.50
Vanadium 0.02-0.10 0.01-0.10 -
Columbium - - 0.005-0.05B

AFor each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50%.
BFor plates under ½ in. [13 mm] in thickness, the minimum columbium is waived.

Tensile Requirements

Note 1 - Where "-" appears in this table, there is no requirement.

 Plates and BarsStructural Shapes
For Thicknesses 4 in. [100 mm] and UnderFor Thicknesses Over 4 in. [100 mm] to 5 in. [125 mm] inclFor Thicknesses Over 5 in. [125 mm] to 8 in. [200 mm] inclAll
Tensile strength, min, ksi [MPa] 70 [485] 67 [460] 63 [435] 70 [485]
Yield point, min, ksi [MPa] 50 [345] 46 [315] 42 [290] 50 [345]
Elongation in 8 in. [200 mm], min, % 18B,C - - 18C
Elongation in 2 in. [50 mm], min, % 21B,C 21B,C 21B,C 21D

ASee specimen orientation under the Tension Tests section of Specification A6/A6M.
BElongation not required to be determined for floor plate.
CFor plates wider than 24 in. [600 mm], the elongation requirement is reduced two percentage points. See elongation requirement adjustments in the Tension Tests section of Specification A6/A6M.
DFor wide flange shapes with flange thickness over 3 in. [75 mm], elongation in 2 in. [50 mm] of 18% minimum applies.