Investment casting, also known as precision casting or lost-wax casting, is a manufacturing process in which a wax pattern is used to shape a disposable ceramic mold.
First, a wax pattern is made in the exact shape of the item to be cast. Each wax pattern is coated with a refractory ceramic material. Once the ceramic material is hardened, it is turned upside-down and heated until the wax melts and drains out. The hardened ceramic shell becomes an expendable investment mold; its internal geometry matches the shape to be cast.
Molten metal is then poured into the mold, where it is allowed to solidify. The resulting metal casting is broken out of the spent mold.
The term investment casting is derived from the process of “investing” (surrounding) a pattern with refractory materials. Investment casting is often selected over other molding methods because the resulting castings present fine detail and excellent as-cast surface finishes. They can also be cast with thin walls and complex internal passageways. Unlike sand casting, investment casting does not require a draft.
These process qualities can provide net shape or near-net shape castings, which provide customers with significant cost savings in material, labor, and machining.
It can make use of most common metals, including aluminum, bronze, magnesium, carbon steel and stainless steel. Parts manufactured with investment casting include turbine blades, medical equipment, firearm components, gears, jewelry, golf club heads, and many other machine components with complex geometry.
Stainless Steel casting (stainless steel investment casting) include austenitic stainless steel casting ,martensitic stainless steel casting and ferric stainless steel casting.
Austenitic steels have austenite as their primary phase (face centered cubic crystal). These are alloys containing chromium and nickel (sometimes manganese and nitrogen), structured around the Type 302 composition of iron, 18% chromium, and 8% nickel. Austenitic steels are not harden by heat treatment. The most familiar stainless steel is probably Type 304, sometimes called T304 or simply 304. Type 304 surgical stainless steel is an austenitic steel containing 18-20% chromium and 8-10% nickel.
The characteristic orthorhombic martensite microstructure was first observed by German microscopic Adolf Martens around 1890. Martensitic steels are low carbon steels built around the Type 410 composition of iron, 12% chromium, and 0.12% carbon. They may be tempered and hardened. Martensite gives steel great hardness, but it also reduces its toughness and makes it brittle, so few steels are fully hardened.
Ferritic steels have ferrite (body centered cubic crystal) as their main phase. These steels contain iron and chromium, based on the Type 430 composition of 17% chromium. Ferritic steel is less ductile than austenitic steel and is not harden by heat treatment.
There are also other grades of stainless steels, such as precipitation-hardened, duplex, and cast stainless steels. Stainless steel can be produced in a variety of finishes and textures and can be tinted over a broad spectrum of colors
As professional supplier of castings in China, we have spectrum and electric furnace to make stainless steel castings. The mainly methods are sand casting and investment casting.
We serve and supply parts, components and products to wide varieties of industries as follow:
1. Valve fittings (valve body, wheel, disc, bonnet and others)
2. Pump Parts (Body, impeller and others)
3. Fastener (Bolt, nut, stud and gasket)
4. Automobile/Motorcycle (drum, bracket, steering knuckle housing, transmission housing, rear wheel hub)
5. Pipe Fittings (malleable iron fittings, threaded stainless steel fittings, ductile iron fittings and others)
6. Steel anchor products.
7. Food Processing.
8. Computer and communication Hardware.
9. Sporting Equipment.
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