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ASTM Corten A Introduction
Corten A plate is weather resistant steel which is better suited for heavy and load bearing structures.Corten A is produced from billet castings from blast furnace and hot rolled in a continuous mill for smaller thicknesses and on a four high mill for others. The purity of the steel of fine grade austenitic quality and the addition of special alloys, and provide this steel plates, excellent mechanical characteristics, even at high temperatures and self-passivating properties when exposed tocorrosive agents present in urban atmosphere. This property allows this steel to face down corrosion for longer periods when compared to common steel, even if not painted.

Hot Forming: Normally it is carried out in a temperature range of 800 °C to 1050 °C. If it is required in different temperature, it is advisable to carry out a normalizing treatment at the end.
Flame Cutting: Normally it is carried out with the usual methods. In general, no preheat is required, but working on plates with a temperature of less than 10 °C shall be avoided.
Drawing: In spite of its excellent mechanical Properties, Corten A can be moderately drawn.
Welding: Corten A plate can be easily welded using common procedures used for mild steel plate (spot, TIG, MIG, MAG, electrode etc.). It is however advisable to avoid tempering in the heated zone and therefore to limit the ratio of linear energy to the thickness. Considering the chemical composition, it can be stated that Corten A steel is not subject to cold cracking. Welded structures fabricated with corten a steel does not normally need thermal stress relief treatment.
Refercence Standards: Corten A steel plate to be following standards: NFA35-502-E36W, ASTMA242 and A588, EN10155-Fe510A1K1/DD2K1, S.E.W087.

ASTM Corten A Chemical Composition

Grade C Max SI Mn S Max Cr Ni Cu Nb Nb+V=Ti P
Corten A 0.12 0.25-0.75 0.20-0.50 0.07-0.15 0.50-1.25 0.65 0.25-0.55 0.25-0.55 - 0.07-0.15

Resistance to Atmospheric Corrosion - The chemical component of Corten A has been designed to provide a high resistance to atmospheric corrosion, in particular to urban environments. It can therefore be used even without shop primed; in this case, a thin layer of stable oxides will be formed, thus preventing further corrosion inside.

ASTM Corten A Mechanical Properties

Grade Permissible yield point
ratio
Yield Strength
MPa(min)
Tensile Strength
MPa
Elongation
% (min)
Bend
Corten A - 345 485 20 1t

Corten A Weathering Steel Parameters

RECOMMENDED BENDING RADII, WITHOUT SPECIAL REQUIREMNETS
Thickness mm 2-3 4 5 6 7 8 10 12
Radius mm 4 8 10 12 21 24 30 36

ASTM Corten A Application
The mechanical characteristics and the resistance to atmospheric corrosion make this steel, the best product for the fabrication of agricultural vans and railway wagons, structures of bridges, water pipes, fans, chimneysand boilers.
The material forms its own protective layer when exposed to atmospheric elements. Essentially, the top layer corrodes and then protects the steel beneath it. The natural finish does not normally require any form of maintenance such as painting, which makes the material a highly cost effective alternative to other structural steels.
Mainly used for construction of tanks, containers, bridges, frame structures, vehicles, etc with the request of welded, bolted, etc.

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