WR50A is a structural weathering steel which 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.
As the steel reacts with elements in the atmosphere, the material forms a layer of rust over time which in essence protects the steel from corrosion.
WR50A steel is the Equivalent grades as S355J0WP (1.8945) steel in EN 10025 - 5 : 2004 standard and FE510C1K1 steel in UNI standard and also E36WA3 steel in NFA 35-502 standard.

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WR50A steel chemical composition by [%]

Grade	Min. Yield Strength Mpa						Tensile Strength MPa			Impact
WR50A	Nominal Thickness (mm)						Nominal Thickness (mm)			degree	J
Thick mm	≤16	>16 ≤40	>40 ≤63	>63 ≤80	>80 ≤100	>100 ≤150	≤3	>3 ≤100	>100 ≤150	0	27
WR50A	355	345	….	….	….	….	510-680	470-630	….	0	27

C %	Mn %	Cr %	Si %	CEV %	S %
Max 0.12	Max 1	0.3-1.25	Max 0.75	Max 0.52	Max 0.035
Cu %	P %	N %
0.25-0.55	0.06 - 0.15	Max 0.009

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.
If WR50A mechanical properties have been significantly modified by heavy coldforming, either stress relief annealing or normalised may be applied. Normalised should also be applied following hotforming outside of the temperature range of 750 - 1.050 °C and after overheating.

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