When to Use Special Alloys in Fabrication

Turbine shafts, heat exchangers, and curved panels aren’t your typical metal fabrication projects. High-spec applications like these involve complex engineering, tight tolerances, and special alloys for fabrication.

For engineers, OEMs, architects, and other high-spec buyers, a non-standard fabrication material is often necessary to achieve the right combination of strength, corrosion resistance, weight, appearance, and thermal stability. Here’s our guide to knowing when to pull a special alloy into your project.

Why Do High-Spec Fabrication Projects Require Special Alloys?

Material selection affects nearly every aspect of a fabricated component. Strength is always a top consideration, but engineers also need to consider moisture, chemicals, heat, weight restrictions, wear, maintenance requirements, and/or aesthetics.

Choosing a standard material for a high-spec project may technically work, but it’s likely to create compromises elsewhere. For example, a buyer might need better corrosion resistance without adding a coating. Likewise, they may need a lower component weight without giving up structural strength, or the project may include a distinctive architectural finish that conventional carbon steel can’t provide. In our experience, these types of requirements are best met with specialized, high-performance metals.

What Special Alloy Options Should Fabrication Buyers Consider?

The term “special alloy” refers to materials that aren’t commonly specified for fabrication, like mild steel, galvanized steel, standard stainless steel, or general-purpose aluminum. It covers a range of non-standard material options, including:

• Specialty stainless steel grades for applications that demand greater resistance to corrosion, chemicals, or temperature.
• High-strength aluminum alloys when both reduced component weight and mechanical performance are priorities.
• Copper and copper alloys when conductivity, corrosion resistance, appearance, or other application-specific properties matter.
• Brass and bronze for architectural, decorative, industrial, and specialty applications that demand a distinctive appearance and material characteristics.
• COR-TEN® steel when designers want a weathering steel that develops a distinctive protective patina.

When Does Corrosion Resistance Justify a Special Alloy?

Corrosion exposure is one of the main reasons to consider using special alloys in fabrication. We recommend identifying the component’s actual exposure instead of simply requesting “corrosion-resistant metal.” Consider whether the component will face continuous moisture, occasional weather exposure, chemicals, salt, cleaning agents, or other corrosive conditions. The severity and duration of exposure can significantly change your material requirements.

The component’s expected service life should also be part of this decision. A material with a higher initial cost may make sense when it reduces corrosion-related maintenance costs or helps the component maintain its performance over a longer period of time.

When Should Strength and Weight Drive Material Selection?

Some projects require engineers to balance keeping components light with maintaining strength and rigidity. Aluminum is often an appealing choice in these situations. However, buyers should look beyond the material name: different aluminum alloys and tempers provide different levels of strength, formability, weldability, and corrosion resistance.

This same principle applies when comparing special alloys for fabrication. Material properties influence the thickness that’s required to achieve a specified level of rigidity or durability. That means that substituting one material for another doesn’t always mean the existing gauge or thickness stays the same.

We always recommend high-spec buyers evaluate material and thickness together instead of treating them as separate decisions.

How Does the Operating Environment Affect Special Alloy Selection?

Before specifying a non-standard material, define where and how the component will operate. A part that’s installed inside a climate-controlled facility faces very different demands than a screen on forestry equipment, an exterior architectural panel, or a component that’s exposed to industrial processing conditions.

When making your material selection, ask:

• Will the component operate indoors or outdoors?
• Will it encounter water, humidity, chemicals, salt, dirt, or abrasive materials?
• Does the application involve elevated or changing temperatures?
• How much structural load or physical impact does the component have to handle?
• Does weight affect installation or equipment performance?
• Does the surface need to meet a particular aesthetic requirement?
• How long should the component remain in service?

Answering these questions helps your fabricator guide you to the right alloy for your application.

How Do Special Alloys Affect Perforated Metal Fabrication?

Once you specify your alloy, you need to confirm that it works with your application’s perforation and fabrication requirements. A design that works well in one material may need adjustments when it’s produced in another.

For perforated components, buyers should consider:

• Material thickness
• Hole size and shape
• Hole-to-hole spacing
• Required open area
• Blank margins and solid areas
• Bends, flanges, and forming
• Mounting holes and finished dimensions
• Surface finish requirements

Should You Specify a Special Alloy or Use a Standard Material?

Don’t assume that a more specialized alloy automatically means a better component. The best material is always the one that provides the properties the application requires and is practical to source, fabricate, and purchase.

We’ve found that a standard material makes sense when it easily meets the project’s mechanical and environmental requirements. On the other hand, using special alloys in fabrication makes sense when a standard option restricts performance, service life, weight, corrosion resistance, appearance, or other critical specifications.

Buyers should also consider material availability and lead time. A highly specialized material may require additional sourcing time or minimum purchase quantities. Discussing alternatives with your fabricator can help determine whether another grade or material can deliver the same performance results more efficiently.

What Information Should You Give Your Metal Fabricator?

The more your fabricator understands about your application, the easier it is to evaluate special alloys. Be sure to share not only your material specification, but the performance requirements behind it. That gives your fabricator a starting point for discussing practical material and manufacturing options.

You don’t need to have every spec finalized when requesting a quote, but try to provide as much information as possible.

• Material or alloy: Include the specified grade and temper when applicable.
• Material thickness: Provide the required gauge or thickness.
• Operating environment: Describe exposure to moisture, chemicals, heat, weather, or other demanding conditions.
• Performance requirements: Identify key strength, weight, corrosion, airflow, or durability targets.
• Perforation requirements: Provide hole size, shape, spacing, pattern, and open-area requirements.
• Finished dimensions: Include overall part or panel dimensions.
• Secondary fabrication: Identify bends, flanges, mounting holes, rolling, or other required operations.
• Quantity: Include prototype and production quantities when applicable.
• Drawings: Provide CAD files, prints, or other plans that define the component.

Choose Special Alloys in Fabrication With Roy Manufacturing

High-spec fabrication projects call for advanced materials. At Roy Manufacturing, we understand when a project requires more than an off-the-shelf material and how that material choice affects perforation, forming, performance, costs, and manufacturability. We’ve spent over 60 years helping OEMs, engineers, architects, and manufacturers turn demanding specifications into practical perforated metal solutions.

Our team works with stainless steel, aluminum, carbon steel, copper, brass, bronze, COR-TEN® steel, and other non-standard materials. Send us your drawings, specifications, and performance requirements, and we’ll help you find a fabrication approach that doesn’t add unnecessary cost or complexity. Contact us today for a same-day quote.