The raw materials of Malleable-iron steel includes iron, recycling steel. In order to acquire the malleable iron properties, good duclitity, the chemical composition should strict control within certain ranges. Typically, 3.5% of the carbon, 2.5% to 0.5% of silicon. Recently, the mature melting technology is mainly through either cupola, gas generator or electric furnace.
Mechanical modelling adopts the mature sand modelling method. Compared with the artificial modelling, mechanical modelling is more efficiency, and the casting part is neater.
when the model has been built, pour molten iron into the cavity. After cooling and solidification of iron, the sand can be removed, and the semi-finished product was produced.
The semi-finished products must be putted into the annealing furnace in order to experience high temperature processing. Now annealing furnace is generally use electric or natural gas as a fuel source. When annealing treatment is completed, the product acquires its mechanical properties.
After to integer processing, the semi-finished products need to be dipped into hot zinc. Galvanized will greatly increase the corrosion resistance, thermal stability and hydrogen embrittlement of pipe-fittings.