The molding of nozzle products is difficult at present, so it is urgent to introduce mold design professionals. Based on the existing moulding technology, through the innovation of die design, it is estimated that the increase of moulding height can be increased by about 100cm under the condition that the original moulding foundation remains the same as that of large foundry manufacturers. In March 2005, the company invested 250 million yuan, 650 new steel rolling production line, the third and fourth expansion of PC steel bar production line, the production of 240 slab, wing plate steel, light rail, large Angle steel, channel steel, round steel, mine i-steel, ball flat, slot for steel and other steel, design production capacity of 600000 tons, which can realize sales income is 2.5 billion yuan, profit tax of 150 million yuan. PC steel bar production line, the annual design production capacity of 50000 tons, the product specification 7.1, 9.0, 10.7 and 12.6 high strength, elongation and production of PC steel pipe pile, and can be widely used in bridge top bridge structure and the other basic components, short construction time, compared with the original grade Ⅱ wire, save 60% steel, is currently the Ⅲ substitute for hot rolled ribbed steel, is one of rapid casting gold smelting department as a promotion product. Prestressed reinforced brittle fracture in order to solve the static silos, longitudinal tensile, tube mill, steam curing, steam curing centrifugal forming and steam curing, even in the middle of the finished product field also need to use magnesium alloy (re -) - si - fe mg alloy casting foundry, low yield, low balling layer and molten iron cooling and pure magnesium processing, has the good spheroidizing effect, but the spheroidizing package need to seal, so magnesium steam pressure is too high, not safe.