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A-588 Grades A, B, K

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

*Elements represented in percentage
Note – Where “-” appears in this table, there is no requirement.

Element Composition %
Grade A Grade B Grade 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

 

Tensile Requirements

Note 1 – Where “-” appears in this table, there is no requirement.

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

 

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