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.
Contact us to discuss your requirements of oem investment casting stainless steel company. Our experienced sales team can help you identify the options that best suit your needs.
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:
China OEM custom stainless steel investmen casting and CNC machining products.
Investment (lost wax) casting is a method of precision casting complex near-net-shape details using replication of wax patterns. Investment casting or lost wax casting is a metal forming process that typically uses a wax pattern surrounded by a ceramic shell to make a ceramic mold. When the shell dries, the wax is melted away, leaving only the mold. Then the casting component is formed by pouring molten metal into the ceramic mold.
For more information, please visit oem precision lost wax investment casting company.
CNC machining refers to the machining process proceed by Computerized Numberical Control (CNC for short). It is aided by the CNC to reach a high and steady accuracy with less labor cost. Machining is any of various processes in which a piece of raw material is cut into a desired final shape and size by a controlled material-removal process. The processes that have this common theme, controlled material removal, are today collectively known as subtractive manufacturing, in distinction from processes of controlled material addition, which are known as additive manufacturing.
Exactly what the &#;controlled&#; part of the definition implies can vary, but it almost always implies the use of machine tools (in addition to just power tools and hand tools). This is a process used to manufacture many metal products, but it can also be used on materials such as wood, plastic, ceramic, and composites. The CNC machining covers many different processes such as milling, turning, lathing, drilling, honing, grinding...etc.
Also called precision machining, the CNC machining could reach a very high accuracy in geometical tolerance and dimensional tolerance. With our CNC machines and Horizontal Machining Centers (HMC) and Vertical Machining Centers (VMC), we can almost meet all of your required tolerance grades.
CNC Precision Machining Capabilities
Facilities
Quantity
Size Range
Annual Capacity
General Accuracy
Vertical Machining Center (VMC)
48 sets
mm × mm × 800mm
tonn or pieces
±0.005
Horizontal Machining Center (VMC)
12 sets
mm × 800mm × 600mm
tons or pieces
±0.005
CNC Machine
60 sets
Max turning dia. φ600mm
tons or pieces
Available Ferrous Metal Materials for Precision Machining Components:
&#; Cast Iron including gray iron and ductile iron
&#; Carbon Steel from low carbon steel, medium carbon steel and high carbon steel.
&#; Steel Alloys from standard grades to special grades on request.
&#; Aluminum and their alloys
&#; Brass and Copper
&#; Zinc and their alloys
&#; Stainless Steel, Duplex, Corrosion-resistant Steel, High-temperature Steel.
The precision machining workshop at RMC takes care probably the most important step in the supply chain after casting. State-of-the-art vertical and horizontal CNC machining centers and other CNC machines could make sure the accuracy of the castings and guarantee the machined castings are finished on time. All machines are well-organized and taken into production at high production effeciency and good cost-effective mothods. If needed, all the machined dimensions could be measured by the CMM and the related reports could be issued as per customer's requirements.
Applications of Our Custom Casting and Machining Parts:
1. Automobile Parts: Brake Disc, Connect Rod, Drive Axle, Drive Shaft, Control Arm, Gearbox Housing, Gearbox Cover, Clutch Cover, Clutch Housing, Wheels, Filter Housing, C.V. Joint Housing, Lock Hook.
2. Truck Parts: Rocker Arms, Transmission Gearbox, Drive Axles, Gear Housing, Gear Cover, Towing Eye, Connect Rod, Engine Block, Engine Cover, Joint Bolt, Power Takeoff, Crankshaft, Camshaft, Oil Pan.
3. Hydraulic Parts: Hydraulic Cylinder, Hydraulic Pump, Gerotor Housing, Vane, Bushing, Hydraulic Tank, Hydraulic Cylinder Head, Hydraulic Cylinder Triangle Bracket.
4. Agricultural Machinery and Tractor Parts: Gear Housing, Gear Cover, Connect Rod, Torque Rod, Engine Block, Engine Cover, Oil Pump Housing, Bracket, Hanger, Hook, Bracket.
5. Rail Trains and Freight Cars: Shock Absorber Housing, Shock Absorber Cover, Draft Gear Housing, Draft Gear Cover, Wedge and Cone, Wheels, Brake Systems, Handles, Guids.
6. Construction Machinery Parts: Gear, Bearing Seat, Gear Pump, Gearbox Housing, Gearbox Cover, Flange, Bushing, Boom Cylinder, Support Bracket, Hydraulic Tank, Bucket Teeth, Bucket.
7. Logistics Equipment Parts: Wheels, Caster, Bracket, Hydraulic Cylinder, Forklift Spare Parts, Lock Case,
8. Valve and Pump Parts: Valve Body (Housing), Butterfly Valve Disc, Ball Valve Housing, Flange, Connector, Camlock, Open Impeller, Close Impeller, Pump Housing (Body), Pump Cover.
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