Skip to content
Investment Casting Company | DFAR & ITAR Compliant
A worker pouring molten metal into a cast at RLM Industries.

Unveiling the Secrets of Stainless Steel Investment Casting

Have you ever wondered how those shiny, durable stainless steel parts are made? From kitchen appliances to medical equipment, stainless steel is everywhere around us. But what makes it so special? With over 800 years of combined experience, RLM Industries is here to explain the world of stainless steel investment casting and explore how we create these tough, long-lasting components.

What is Stainless Steel?

Stainless steel is a type of steel that contains chromium, giving it excellent resistance to corrosion and rust. This makes it perfect for products that need to withstand harsh environments or frequent exposure to moisture. Stainless steel isn’t just tough on the outside—it’s also incredibly strong and durable.

Unlike regular carbon steel, stainless steel contains at least 10.5% chromium by mass. This chromium content allows a thin, invisible layer of oxide to form on the surface, acting as a protective barrier against corrosion and rust. Stainless steel can also be alloyed with other metals like nickel, molybdenum, and manganese to enhance specific properties like strength, heat resistance, or formability for different applications.

With over 150 grades available, each with unique characteristics, stainless steel offers a wide range of options to meet the demanding requirements of various industries. Its low maintenance and long service life make it a popular choice for countless products we use every day.

The Investment Casting Process

How do companies like RLM Industries turn this super-strong material into intricate parts? We use a process called investment casting, also known as lost-wax casting. Here’s a quick overview of how it works:

  1. First, we create a wax pattern of the part we want to make.
  2. Next, the wax pattern is dipped into a ceramic slurry, which hardens into a mold.
  3. The wax is then melted out of the mold, leaving a hollow space in the shape of the desired part.
  4. Molten stainless steel is poured into the mold, filling the cavity.
  5. Once the metal has cooled and solidified, the ceramic mold is broken away, revealing the finished stainless steel part.

This process allows for the creation of incredibly detailed and complex shapes that would be difficult to make using other manufacturing methods.

Benefits of Stainless Steel Investment Casting

So, why choose stainless steel investment casting? Here are a few key benefits:

  • Corrosion Resistance: As mentioned earlier, stainless steel is highly resistant to corrosion and rust, making it ideal for products that will be exposed to moisture, chemicals, or harsh environments.
  • High Strength-to-Weight Ratio: Stainless steel is incredibly strong for its weight, which means parts can be made lighter without sacrificing durability.
  • Extreme Temperature Tolerance: Stainless steel can withstand extremely high and low temperatures, making it suitable for applications like automotive exhaust systems or cryogenic equipment.
  • Precision & Detail: The investment casting process allows for the creation of parts with intricate details and tight tolerances, ensuring a high-quality finished product.

Applications of Stainless Steel Investment Castings

Thanks to its unique properties, stainless steel investment castings are used in a wide range of industries, including:

  • Aerospace & Defense: Stainless steel components are used in aircraft, missiles, and other military applications where strength and corrosion resistance are critical.
  • Automotive: From exhaust systems to turbochargers, stainless steel castings play a vital role in modern vehicles.
  • Medical & Pharmaceutical: Stainless steel’s corrosion resistance and biocompatibility are ideal for surgical instruments, implants, and pharmaceutical equipment.
  • Food & Beverage: Stainless steel’s easy-to-clean surface and resistance to bacteria make it a popular choice for food processing and handling equipment.

Frequently Asked Questions About Stainless Steel Investment Casting


What is stainless steel investment casting?

Stainless steel investment casting, also known as lost-wax casting, is a manufacturing process to create intricate and precise metal parts. It involves creating a wax model, coating it with ceramic to form a mold, melting away the wax, and then pouring molten stainless steel into the mold. This process allows for detailed and complex shapes, making it ideal for producing high-quality components.

Which industries commonly use stainless steel castings?

Stainless steel castings are widely used in aerospace and defense, automotive, medical, pharmaceutical, and food industries. For example, in aerospace, they are used for aircraft components, while in the medical field, they are used for surgical instruments and implants. The material’s versatility and reliability make it valuable across multiple sectors.

What types of stainless steel are used in investment casting?

Depending on the final product’s required properties, various grades of stainless steel are used in investment casting. Common types include austenitic, martensitic, and duplex stainless steel. Each type offers specific benefits, such as enhanced corrosion resistance, increased strength, or improved hardness, tailored to meet the needs of different applications.

RLM Industries: Your Partner in Stainless Steel Investment Casting

At RLM Industries, we’re proud to be a leading provider of stainless steel investment casting services. Our team of skilled professionals has decades of experience working with this versatile material. We use state-of-the-art equipment and techniques to guarantee the highest quality results.

Whether you need a simple component or a complex assembly, we have the expertise to bring your design to life. We work closely with our clients to understand their unique requirements and provide tailored solutions to meet their needs. If you’re looking for a reliable partner for your stainless steel investment casting needs, look no further than RLM Industries. Contact us today to learn more about how we can help bring your project to fruition.

Find Stainless Steel Investment Casting in Oxford, MI at RLM

At RLM Industries, we have over 800 years of combined experience in metal casting. From rapid prototyping to investment casting, our team of professionals can help you with your next project. Contact us online or give us a call at (248) 965-5227 to get started today.