S355J0WP steel is a structural weathering steel. It is also referred to as atmospheric corrosion resistant steel. The main alloying elements are chromium nickel and copper with added phosphorous which gives it excellent self protecting qualities.
S355J0WP chemical details:
For long products the P and S content can be 0.005% higher
The steels may show a Ni content of max. 0,65 %
The max. value for nitrogen does not apply if the chemical composition shows a minimum total Al content of 0,020 % or if sufficient other N binding elements are present. The N binding elements  shall be mentioned in the inspection document.
S355J0WP mechanical properties:
The S355j0wp grades have yield strength of"335"or"345"MPa, and ultimate tensile strength of"470-630"or"510-680"MPa. The fracture elongation of this steel is 20%. The tensile test values given in the table apply to longitudinal samples; in case of strip and sheet steel of widths of ≥600 mm they apply to transverse samples.

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