GB/T4171 Q235NH weathring and corrosion resistant steel plates refer to the low alloy structural steel, which can form corrosion resistant rust layer. GB/T4171 Q235NH weathring and corrosion resistant steel plates can be used in the manufacture of steel structures such as vehicles, bridges, towers, containers and other steel structures.
Compared with the common carbon steel, Q235NH weatherproof steel has better corrosion resistance in the atmosphere. Compared with stainless steel, GB/T4171 Q235NH weathring and corrosion resistant steel plates contain only a few trace elements, such as phosphorus, copper, chromium, nickel, molybdenum, niobium, vanadium and titanium. The total amount of Q235NH weathring steel alloying elements is only a few percent, not as much as that of stainless steel. So GB/T4171 Q235NH weathring and corrosion resistant steel plates price is relatively low.
GB/T4171 Q235NH weathring and corrosion resistant steel plates usually adopt fining material into furnace-smelting (converter, electric furnace- micro alloying- argon blowing - LF refining - low superheat continuous casting (feeding rare earth wire), controlled rolling and controlled cooling. During smelting, scrap steel is added into the furnace with furnace charge. After smelting by conventional process, the deoxidizer and alloy are added after tapping. The molten steel is processed by argon blowing, and then casted. The steel after argon blowing is tempered and cast into slab by continuous casting machine. Because of the addition of rare earth elements, the GB/T4171 Q235NH weathring and corrosion resistant steel plate is purified and the content of inclusions is greatly reduced.
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