Material of B480GNQR Weathering steel plate/sheet

B480GNQR steel standards: Q/BQB 340

B480GNQR weathering steel alloy components and weight percentage contents: C:0.12 ~ 0.21, Si:0.2 ~ 2.0, Mn:0.7 ~ 2.0, s is less than or equal to 0.036, P < 0.034, Cu:0.10 ~ 0.40, Al<0.2, for the rest of the Fe and trace impurities. Through the Cu, Mn, Si, Al and other alloying, and simple adjustment of ordinary low carbon steel (Q235 steel) part of the element content.

B480GNQR Weathering steel plate after the addition of phosphorus, copper, chromium, nickel, microelements, steel surface forming dense and strong protective film attached, hindering the corrosion to the spread and development of the, the protective rust layer below the matrix to slow the corrosion rate.