Alloy Steel Investment Casting Lost Wax Castings OEM Impeller Parts

Alloy Steel Investment Casting Lost Wax Castings OEM Impeller Parts

Product Description and Process

Alloy Steel Investment Casting Lost Wax Castings OEM Impeller Parts & CNC Machining

Production process: green sand molding, pre-coated sand molding, lost wax investment casting process

Machining process: CNC machine, machining center, lathe, mill machine, drill machine, etc.

Surface treatment process: paint coating, electrophoretic coating, electrogalvanizing coating, black oxide coating, powder coating, etc.

Product Material and Uses

Normally produce with ASTM A148/148M, ZG40Mn, ZG40Cr, ZG20SiMn, ZG35SiMn, ZG35CrMo, ZG35CrMnSi, etc.

The alloy steel casting products are widely used for Auto-cars, trains, trucks, vehicle components, mining machinery components, agricultural machinery parts, textile machinery parts, construction machinery parts, etc.

Low and High Alloy Steels

Low Alloy Steels add alloying elements such as nickel (Ni), chromium (Cr), and molybdenum (Mo) to attain specific properties. Depending on the alloying elements used, there can be great variation between different low alloy steels.

The total alloy content can range from 2.07% to approximately 10.5%. For many low-alloy steels, the primary function of the alloying elements is to increase hardenability (the degree to which the steel will harden during heat treatment). Alloy additions can also be used to reduce environmental degradations under certain specified service conditions.

High Alloy Steels are usually a type of stainless steel, the most widely consumed commercial high alloy steel. Stainless steels contain at least 10.5% chromium, along with other alloys such as nickel to alter other properties (such as strength or weldability) in addition to corrosion resistance.

What Is an Investment Casting?

Investment casting refers to the ceramics formed around the wax patterns to create a casing for molten metal to be poured. Once the wax models are created, they are melted onto a gate system, dipped into slurry and sand to form a layered casing, then replaced with the melted metals such as carbon steel, alloy steel, stainless steel, aluminum, copper, and much more.

Investment casting, often referred to as "lost-wax" casting, uses an expendable-mold process to achieve complex forms with exceptional surface qualities. It is a precision casting technique that can achieve exceptional accuracy for products both small and large, in a range of materials.

To create a mold, a wax pattern is dipped into ceramic material. Once the ceramic dries, it is placed in a kiln which hardens the ceramic and causes the wax center to melt and run out. Molten metal is then poured into the now-empty cavity, and once solid, the mold is broken to reveal the final cast metal object.

The process is derived from one of the oldest known metal-forming techniques. There is evidence that humans used it to make cast metal objects since before 4000 BC. Traditional lost-wax techniques, however, have been improved and refined through history to meet the demands of modern industrial production.

Understanding the investment casting process is valuable to understand how it differs from other methods.

Advantages of Investment Casting

INVESTMENT CASTING VS. SAND CASTING

Sand castings are made by creating a negative in a bed of sand to create the cavity for casting. A sand shell creates a rough exterior to castings. Typical surface finish of sand castings are 250 Ra as cast, and need extensive work afterwards to create a surface finish that is acceptable in most applications. Sand castings can also not hold as tight of tolerances as Investment Castings, and will likely need more machining than an Investment Casting.

Investment casting uses a ceramic mold that can produce a much smoother finish, typically averaging 125 Ra surface finish as cast. Investment castings also greatly reduce the amount of machining that will be required after casting by holding a .005”/inch tolerance for the majority of applications.

Alloy Steel Grade Standard 

Alloy Structural Carbon Steel Grade Standard