Stainless steel precision casting mechanical properties than cast iron, but its casting performance than cast iron is poor, is called the investment casting or precision casting. Its high melting point, easy to oxidation of molten steel, poor fluidity of molten steel, contraction of large, stainless steel precision casting is not only applicable to all types, all kinds of alloy casting.
Stainless steel precision casting process characteristics:
1, due to the contraction of stainless steel precision casting significantly more than cast iron, castings in order to prevent shrinkage, shrinkage defects in the casting process are mostly riser and cold iron and subsidies and other measures to achieve the order of solidification.
To prevent the stainless steel castings shrinkage, shrinkage, porosity and crack defects, should make the wall thickness uniformity, to avoid the sharp corners and right angle structure, in the mold sand with sawdust, add coke in the core, and the use of hollow type Core and oil sand core, etc. to improve the sand or core of the concession and permeability.
2, due to the poor fluidity of molten steel, steel castings in order to prevent cold castings and pouring inadequate, cast steel wall thickness can not be less than 8mm; the use of dry-cast or hot cast; appropriate to improve the pouring temperature, generally 1520 ° ~ 1600 ℃, because the pouring temperature is high, the superheat degree of the molten steel is large, the time of keeping liquid is long, and the fluidity can be improved. But the temperature is too high, will cause coarse grain, hot crack, porosity and sticky sand and other defects.
So the general small, thin-walled and complex shape of the precision casting, the pouring temperature is about the melting temperature of steel + 150 ℃; casting system to simple structure, and cross-sectional size larger than cast iron; large, thick castings casting temperature Higher than its melting point of about 100 ℃.
Stainless steel precision casting process characteristics:
1, due to the contraction of stainless steel precision casting significantly more than cast iron, castings in order to prevent shrinkage, shrinkage defects in the casting process are mostly riser and cold iron and subsidies and other measures to achieve the order of solidification.
To prevent the stainless steel castings shrinkage, shrinkage, porosity and crack defects, should make the wall thickness uniformity, to avoid the sharp corners and right angle structure, in the mold sand with sawdust, add coke in the core, and the use of hollow type Core and oil sand core, etc. to improve the sand or core of the concession and permeability.
2, due to the poor fluidity of molten steel, steel castings in order to prevent cold castings and pouring inadequate, cast steel wall thickness can not be less than 8mm; the use of dry-cast or hot cast; appropriate to improve the pouring temperature, generally 1520 ° ~ 1600 ℃, because the pouring temperature is high, the superheat degree of the molten steel is large, the time of keeping liquid is long, and the fluidity can be improved. But the temperature is too high, will cause coarse grain, hot crack, porosity and sticky sand and other defects.
So the general small, thin-walled and complex shape of the precision casting, the pouring temperature is about the melting temperature of steel + 150 ℃; casting system to simple structure, and cross-sectional size larger than cast iron; large, thick castings casting temperature Higher than its melting point of about 100 ℃.
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Keywords:Stainless steel precision casting, the characteristics of processing technology
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