Weathering Steel Trademark CORTEN Steel performance and contrast

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American Standard Designations: The basic & fundamental CORTEN grade was designated in standard designation A 242 i.e. CORTEN grade A. Newer grades are specified in American Standard A 588 i.e. CORTEN grade B.
Dimensional Characteristics of Weathering steel: The applicable thickness for this grade A material is defined in the ASTM A242 starts from 19 mm to 102 mm. for grade B material; ASTM A 588 specifies thickness starts from 100 mm to 203 mm.
The Chemical Composition of Weathering steel: ASTM A defines the chemical composition of base metal of this steel as under:
Maximum percentage of Carbon(C) is 0.12 percent for grade A CORTEN steel & for grade B it is 0.16 percent.
Percentage of Manganese(Mn) is from 0.20 to 0.50 percent for grade A CORTEN grade & for grade B it is from 0.80 to 1.250 percent.
Percentage of Phosphorous(P) is from 0.01 to 0.20 percent for grade A material & for grade B it is 0.03 percent.
Percentage of Silicon(Si) is from 0.25 to 0.750 percent for grade A weathering material & for grade B it is from 0.30 to 0.50 percent.
Percentage of Sulphur(S) is to 0.30 percent for grade A material & for grade B it is also 0.30 percent.
Percentage of Chromium(Cr) is from 0.5 to 1.250 percent for grade A material & for grade B it is from 0.40 to 0.650 percent.
Percentage of Copper(Cu) is from 0.25 to 0.550 percent for grade A COR-TEN material & for grade B it is from 0.30 to 0.40 percent.
Percentage of Vanadium(V) is 0 percent for grade A COR-TEN material & for grade B it is from 0.02 to 0.10 percent.
Remaining is iron (Fe) percentage and with few negligible impurities.
(Note: These values are indicative & for information purpose only. Please refer to latest standard for actual values)
Mechanical Properties of Weathering steel: Following are some of the mechanical properties of this type:
The tensile strength of this steel type is expressed in Newton per millimeters and for different grades it is different, usually it starts from 290 N/mm2 (MPa) to 460 MPa.
The weld ability of these materials is complex to manage. Engineers have to ensure that weld-points rusts at the same magnitude as the other adjoining materials may require advance welding methodologies or different materials.
Applications of Weathering Structural Steels: Applications are as under
It is also applied in bridges and various large structural applications.
It is incredibly & extensively utilized in marine transportation.
It is also used in the manufacturing of intermodal shipment containers
It is also utilized in observant sheet piling on areas of motorway that are recently widened.
At some places in the world, all poles for supporting the catenary on railways are manufactured from this steel type due to aesthetic motives. 
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