Stainless Steel Casting Poor Performance
Stainless steel casting casting performance is poor, Stainless Steel Casting poor mobility, body shrinkage and line shrinkage larger, thermal stress, easy to produce cracks. Once the castings crack, not only the heavy workload, serious may also be scrapped, resulting in significant economic losses.
Casting to fully consider the casting structure, shape, large, Stainless Steel Casting wall thickness and its impact on the casting liquid and solid shrinkage factors, select the appropriate process parameters to prevent shrinkage and other casting defects. Casting riser system design should be reasonable, Stainless Steel Casting if you want to use cold iron and other technical measures, the placement of the site to be reasonable, it is necessary to ensure the internal organization of the compact, but also try to avoid the stress concentration of the situation.
Smelting process, try to reduce the P, S and other harmful elements, reduce the N, H, O and other gases and inclusions. Through the use of low-phosphorus steel alloy, Stainless Steel Casting can play a very good effect.
Through the appropriate extension of the casting in the sand in the holding time, mainly to control the box temperature below 70 ℃, Stainless Steel Casting to ensure that the casting in the sand to fully complete the liquid and solid shrinkage, to avoid external factors caused by stress concentration occurs.
In the process of sand casting in the casting process, it is strictly forbidden to water the sand and castings when the box is strictly forbidden. It is forbidden to use sand, Stainless Steel Casting such as collision box, to avoid the external force and the internal stress interaction of the casting.
According to the casting conditions to select the appropriate thermal cutting riser process to ensure that the thermal start temperature of not less than 300 ℃. Operation, gas cutting torch and oxygen tube with vibration cutting. Important pieces of gas cut after the timely use of asbestos cloth cover or into the furnace heat treatment. For the crown and axial flow of a class of complex structure, the process to take special measures of the castings, the use of secondary thermal cutting.
In the stainless steel casting defect handling, Stainless Steel Casting to adhere to the principle of warm-up. In the blowing, welding process, the workpiece should be preheated to above 108 ℃ before operation. If you find a large crack defects, should be carried out to stress annealing, and then processed.
For a major stainless steel castings to be a final elimination of stress annealing process, Stainless Steel Casting strictly control the holding time and baked temperature. Its purpose is to reduce the production process to produce new stress concentration, more completely eliminate the casting stress, to prevent the occurrence of cracks.
With the technical progress and product quality requirements to further enhance the current heavy machinery industry in steel products, the performance requirements of the coating more stringent. Such as hydraulic press frame, thermal power unit cylinder head, turbine blades and other castings, due to the casting weight (general weight 40-100 tons, the maximum thickness of 500-1000mm, after casting temperature close to 10 days), Stainless Steel Casting the requirements of the casting paint is very harsh. So the conventional sense of the cast steel coating has been unable to meet the actual needs, the need for higher performance, higher refractorability of the professional paint to solve such problems. To this end, Chengdu Branch deep company specializes in TS-157-type high-purity "zircon powder alcohol-based paint" to meet the higher standards of the actual needs of customers, and achieved good market response.