=12px[color=#000000]Because the shortening of fine casting of stainless steel is much greater than that of cast iron, in order to avoid the defects of shrinkage and porosity, riser, chill and subsidy are mostly used in casting technology to complete sequential condensation.[/color]=12px[color=#000000]In order to avoid shrinkage, porosity, porosity and cracks in stainless steel casting, uniform wall thickness, sharp and right angle structure,lujianshi.75ix.com liujiaomoju.75ix.comhuafenchim.75ix.com gelidun.75ix.com yadingmoju.75ix.cn liushui.75ix.cn sawdust addition in moulding sand, coke addition in moulding core, and hollow core and oil sand core selection should be made to improve the concession and permeability of sand moulds or cores.[/color]=12px[color=#000000]Due to the poor fluidity of molten steel, in order to avoid cold insulation and lack of pouring, the wall thickness of steel castings should not be less than 8 mm; dry or hot casting models should be selected; proper pouring temperature should be improved, generally from 1520 to 1600 C. Due to the high pouring temperature, the superheat of molten steel is high, and the time to keep liquid is long, so the fluidity can be improved. However, too high pouring temperature can cause coarse grain, hot cracking, porosity and sand sticking.[/color]=12px[color=#000000]Therefore, the pouring temperature of fine castings with small size, thin wall and disorderly shape is about steel melting point temperature + 150 C; the structure of the pouring system is simple and the cross-section size is larger than that of cast iron; and the pouring temperature of large and thick-wall castings is about 100 C higher than that of cast iron.[/color]

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