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A Steel Casting Foundry consists of machines and equipment that are used in the manufacturing process. This equipment includes a high-tech furnace that is loaded with metal and heated to a temperature above its melting point. The molten metal is then ladled from the furnace into a refractory-lined steel pouring ladle. It is then skimmed to remove slag and is tipped to pour into a mold cavity.The workers at a steel casting foundry must be physically fit. The work environment in a foundry is extremely hot, and any little mistake could lead to the destruction of equipment or to an injury or fatality. For this reason, workers at a foundry must wear heavy-duty safety gear and protective clothing. In addition, they must be knowledgeable in the use of power tools, which can cause accidents. There are also simple safety precautions that can be taken to minimize the risk to workers and equipment.Stainless steels have a different set of requirements. They must be easier to clean, which is helpful in sanitary applications. A polished surface is better for these types of applications. A rough surface, on the other hand, is better for lubrication. For example, a pattern may be removed more easily from a shape by cutting it with a knife, which makes it easier for the foundry to clean. Hollow gaps are also used instead of a draft, which is why they're so important.Another factor that must be considered before choosing a steel casting foundry is the pattern quality. An excellent pattern will ensure an accurate and near-net shape, and dimensional accuracy is essential. A good foundry will be able to produce various shapes, including internal and external holes. They will also have the ability to control shrinkage, which is an important consideration when casting steel. A long, slender part will shrink faster than a rounded or stout one.The benefits of steel castings include enhanced mechanical properties, corrosion resistance, magnetic response, and thermal expansion, making designed products more flexible. These properties can be impossible to achieve with other manufacturing methods. The process of steel casting is extremely complex and should only be undertaken by an experienced metal worker. There are several ways of casting steel and choosing the right one depends on the type of metals and the size of the run. This is why a steel casting foundry should only be chosen for such tasks.The composition of steel has a large effect on its toughness. For instance, high-alloy steels contain a high proportion of chromium and nickel. Moreover, they are highly resistant to corrosion. Steel castings are also categorized according to their chemical composition. They can be divided into two broad categories ' carbon steel and alloyed steel. The alloy content of the steel determines their toughness and machinability.
Factory Foundry Metal Silica Sol/Lost Wax-Investment-Precision-Precise-Alloy /Carbon /Metal/Stainless Steel CastingSpecification
item
steel casting
Place of Origin
China Zhejiang
Brand Name
nbkeming
Model Number
KM-SC002
Material
Carbon steel, alloy steel, stainless steel
Size
Customized according to customer's requirements
Features
OEM processing customization
Usage
Auto parts, agricultural machinery, construction machinery, metal products, outdoor metal products, hydraulic parts
Stainless steel has its characteristics of rust resistance, corrosion resistance and shining appearance, therefore, it is always preferred as the forming material of various metal products. Stainless steel casting, as its name implies, is the casting process of stainless steel alloys. Investment casting or lost wax casting, is the most precise casting method to manufacture stainless steel products, especially those irregular or complex structures, so stainless steel investment casting is almost equal to stainless steel precision casting. The whole casting stainless steel process contains several steps: mold making, wax model making, tree assembly, dipping and dewaxing, pouring, etc.
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CFS Stainless Steel Foundry, located in Ningbo, China, has started its business of stainless steel investment casting since 30 years ago. In recent years, we continuously improve our production and management experience, and have become one of the largest stainless steel casting manufacturers and exporters in China. Currently, we can supply our customers all types of stainless steel castings with OEM services. To serve our customers better, value added services including heat treatment, post machining, surface finish are all available. We aim to supply our customers best quality, while competitive prices.
Chemical Compositions Grades Elements C Si Mn S P Cr Ni Mo 304 '0.08 '1.00 '2.00 '0.03 '0.045 18 ~ 20 8 ~ 11 ' 304L '0.03 '1.00 '2.00 '0.03 '0.035 18 ~ 20 8 ~ 12 ' 316 '0.08 '1.00 '2.00 '0.03 '0.045 16 ~ 18 10 ~ 14 2 ~ 3 316L '0.03 '1.00 '2.00 '0.03 '0.045 16 ~ 18 10 ~ 14 2 ~ 3 410 '0.03 '1.00 '1.00 '0.03 '0.040 11 ~ 13.5 '0.6 ' 416 '0.15 '1.00 '1.25 '0.15 '0.060 12 ~ 14 '0.6 ' 17-4 ph '0.07 '1.00 '1.00 '0.03 '0.040 15.5 ~ 17.5 3 ~ 5 ' '0.03 '1.00 '2.00 '0.03 '0.040 21 ~ 24 4.5 ~ 6.5 2.5 ~ 3.5
1. Wax Model Making & Assembly
Once the mold is ready, inject wax material into the mold cavity, then take out the wax model from the mold after cooling. Repair some appearance defects of wax models, such as slot, wax injection nozzle, flow pattern, etc. After inspection wax models, weld them to the casting system one by one to form a assembly, which looks like a tree.
2. Shell Building
Shell making process is a whole silica sol process, namely dip the assembly into good colloidal silica coating, sprinkle with fire-resistant sand, dry and harden shell under certain temperature,thus to form dense refractory coating surface outside the surface of wax models, and then repeat the step 5-6, finally form a certain strength and refractoriness of silica sol shell.
3. Dewaxing
Dewaxing is a process in which the wax inside the shell is melted by high temperature steam and then drained out, resulting in a cavity that can be poured into the mold.
4. Pouring
Melt stainless steel ingots into liquid status under a certain high temperature, then pour the liquid into the shell and cool under room temperature. After solidification, knock out the blacks and clean sand.
5. Cutting, Grinding & Surface Finishing
Cut the stainless steel casting blanks from assembly one by one, remove the sprue gate by grinding machine and smooth the surface by various surface finishes, such as shot blasting, sand blasting, electropolishing, mirror polishing, etc.
6. Inspection
After finishing production, inspection is also an indispensable process before delivery. The inspection of stainless steel castings includes dimensional inspection, defects inspection and material inspection. Only qualified products can be shipped to customers.
Heat Treatment: Solution Treatment
Solution treatment is a kind of heat treatment process in which stainless steel castings are heated to a high temperature and maintained constant temperature in the single-phase zone, so that the excess phase is fully dissolved into the solid solution and then cooled rapidly, so as to obtain the su-saturated solid solution. The purpose of solution treatment is mainly used to elimate the internal stress and improve the mechanical properties of cast stainless steel components, which will be easier to operate post machining.
Unlike heat treatment for other steel investment castings, solution treatment is the only heat treatment method used after stainless steel investment casting process. And we suggest heat treatment process especially for those stainless steel castings to be post machined, as the hardness of stainless steel castings is high, which is difficult to machine, and solution treatment will reduce the hardness effectively!
Post Machining
Investment casting is preferred to produce cast stainless steel parts mainly because it can creat near net shape products, even without secondary machining. But due to the limitations of stainless steel investment casting, this casting process can not creat net shape parts in most cases when there is a higher size accuracy and higher surface finish requirement. In this condition, post machining is operated to remove excess material by grinding, milling, drilling, etc. CNC machining is the most precise machining process, while the cost is high.
To serve our customers better, CFS has its machining capability to supply machined stainless steel castings for our customers when there is such requirement. With in house machining, we can do the inspection timely and solve problems in the shorest time. In addition, the machining cost is ideal compared with outsourced factory.
Surface Finish
For stainless steel castings, there are several surface finish methods to improve its appearance, including shot blasting, sand blasting, electropolishing, mirror polishing, powder coating, etc.
Shot blasting: The most common and cost-optimal surface finish method to remove mill scales, burrs. It is the process to smooth stainless steel castings by the grinding of small steel balls in shot blasting machine.
Sand blasting: The process of cleaning the surface of stainless steel castings by the impact of high speed sand flow. The surface is more smooth than that of sand casting, while the cost is higher.
Electropolishing: A technique in which stainless steel castings are used as the anode for electrolysis in an appropriate electrolyte to selectively remove its rough surface and improve its surface smoothness. The surface is a bit shinning after electropolishing.
Mirror Polishing: Like its name, it is the manual polishing process operated with grinding wheel, and the surface will looks very shinning like a mirror, which is most time costing surface finish method. And due to its high requirement, the cost is highest compared with other surface finish ways.
Powder Coating: A surface treatment method for spraying plastic powder onto stainless steel castings. Like painting, there are different colors selected.
For metal castings requiring corrosion resistance and high strength, stainless steel casting is an ideal choice. The stainless steel investment casting process is used to create components for a range of industries including aerospace, petrochemical, medical, automotive, and food and dairy. Some of the parts and components commonly produced through stainless steel casting include:
For more information, please visit oem precision lost wax investment casting manufacturers.