SAND CASTING EQUIPMENT.

Synthetic cast iron is a process in which the furnace charge is not made of pig iron, but mainly consists of scrap, reheated material and iron scrap, and carbon enhancer is added to the melt to obtain the required carbon in the molten iron, and the temperature characteristics of the medium frequency induction furnace and electromagnetic stirring are used to obtain high quality molten iron. It is a process method to obtain high quality cast iron products by reinforced breeding during pouring.
Xinyuanzhu summarizes the key points of making synthetic cast iron are mainly
1. high quality raw materials. Including scrap steel, carbon enhancer, inoculant, spheroidizer, etc. Scrap steel preferably low carbon, low sulfur, low phosphorus without impurity elements of carbon scrap. Now the carbon steel are aluminum quelling steel, residual aluminum in the cast iron may cause defects such as porosity, this point is necessary to pay attention to. Carbon enhancer preferably calcined petroleum coke after high temperature graphitization treatment. Now do carbon enhancer manufacturers are everywhere, the quality varies, this point is also need to pay attention to. According to the form of carbon, carbon enhancers can be divided into crystalline graphite carbon enhancers and amorphous graphite carbon enhancers. Crystalline graphite carbon additive after high temperature graphitization treatment, its C atoms from the original disorderly arrangement into flake orderly arrangement, can become a very good graphite nucleation core. Rusty, wet and serious furnace material will bring in a lot of oxygen and hydrogen, consuming the carbon in the carbon enhancer, and should be avoided as much as possible. Synthetic cast iron eliminates the adverse effects of raw materials such as pig iron heredity, stable melting process, uniform composition and stable organization. Synthetic cast iron can consume raw materials such as reheat charge, chips, etc., which can effectively reduce the production cost.

2. Selection of inoculant. The characteristics of electric furnace iron are very different from those of cupola iron, which has high supercooling and less crystal cores, and must be well bred. This point is crucial. According to the current breeding theory, do a good job of breeding with the flow, also known as instant breeding. Breeding agent is not recommended to use ordinary 75 ferrosilicon, you should choose a long-lasting breeder containing barium, calcium, strontium and other trace elements.

3. Silicon carbide pretreatment. Silicon carbide pretreatment is also a very hot process in recent years, but due to the uneven quality of silicon carbide, the inherent concept is not timely change, the operation process and details are not in place, resulting in a variety of problems in the use of silicon carbide, affecting its promotion. To carefully figure out the brand process suitable for their own use.

4. High-temperature superheat static processing. The benefit of high-temperature superheat is to improve the uniformity, conducive to the slag gas floating, the quality of the ferrofluid improved significantly.

5. Reasonable charging sequence and distribution system.
The controllable temperature of medium frequency induction furnace and the role of electromagnetic stirring provide good conditions for the production of synthetic cast iron. Reasonable distribution system and charging sequence can minimize the average energy consumption per ton. The mechanical properties of synthetic cast iron are better and the processing properties are also good, which deserve careful study.
5.1 The source of nitrogen in synthetic cast iron: some people think it is brought in the scrap steel, others think it is the scrap steel in the melting process, the nitrogen in the air ionized into the molten iron under the action of high temperature, Xinyuanzhu through practice found that the more important source is the nitrogen in the resin brought in through the casting back to the furnace material. The nitrogen in the iron liquid <100ppm can stabilize the pearlite, make the flake graphite shorter and thicker, and blunt the end; more than 100ppm will promote the formation of carbide, and if the nitrogen content >140ppm, white mouth and fissure-like nitrogen pores may appear.
5.2 Necessity and practicality of high temperature superheating. With the increasing cost of raw materials, there is a view that ordinary gray cast iron does not need to be overheated. Superheating temperature increases, and power consumption rises. In the premise of meeting the performance requirements, there is no need for overheating. Of course, only for the performance requirements of gray cast iron, alloy cast iron and ductile iron or the need for over heat treatment.
5.3 The use of chips. Need to add according to the actual situation of the casting, to find a limit ratio, significantly reduce production costs.
5.4 The research and use of trace elements. Once tested the use of trace elements such as Sn, Sb, Bi, etc., in mass production basically no significant effect, and in some cases even the opposite of the conclusion of the laboratory data, the need to explore the amount of trace elements and methods suitable for production practice.

Xinyuanzhu Group specializes in the production of Ductile iron castings, Pig iron gray iron casting, Steel casting, Brass Casting, Malleable Iron Casting, and undertakes batch casting processing of castings. Welcome guests to cooperate with pictures or samples.