Due to the processing technology of the stainless steel precision casting
, stainless steel precision casting shrinkage considerably more than cast iron, to prevent the casting shrinkage cavity, shrinkage defects, using riser and mostly on the casting process, cold iron and subsidies and other measures, in order to realize sequential solidification, to prevent stainless steel castings, shrinkage cavity, shrinkage, porosity and crack defects, should make its uniform thickness, avoid sharp corners and rectangular structure, sawdust are added into the mould with sand, add coke to the core, and the empty heart core and sand core and so on to improve the sand mold or core of breathable and back down.
And because of the liquid steel illiquid, to prevent steel cold insulation and misrun, steel wall thickness not less than 8 mm;
Use dry mold or hot mould;
Properly increasing pouring temperature, average of 1520 & deg;
~ 1600 ℃, because of the high pouring temperature, liquid steel superheat, keep long liquid, liquid can be improved.
But the water temperature is too high, can cause coarse grains, defects such as hot cracking, porosity, and adhering sand.
So generally small, thin wall and complex shape precision castings, the pouring temperature is about steel melting point temperature of + 150 ℃;
Gating system to simple structure, and section size is bigger than cast iron;
Large, thick wall castings pouring temperature about 100 ℃ higher than the melting point.
Given all this, the mechanical properties of the stainless steel precision casting is higher than cast iron, but its performance is worse than cast iron casting, belong to the said revestment precision casting and precision casting.
Its high melting point, easy oxidation of liquid steel, poor liquidity, contraction of molten steel, stainless steel precision casting is suitable for various kinds, all kinds of alloy casting.
Nanjing foundry co. , LTD. , the history of professional strength and modern management mode to achieve the excellent complementary and fusion, through constant innovation and development, now has luxuriant turned, coruscate gives new vitality, casting products with annual production heat resistant, wear resistant cast steel, carbon steel, low alloy steel casting, grey iron castings, ductile iron parts, stainless steel castings and all kinds of large and medium-sized castings 80000 tons of capacity, is the domestic market competitiveness of the cast steel, cast iron, stainless steel castings and profile production base.
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