Author: Scott Bredemann
Updated: 06/22/2025 | Read Time: 9mins
Modern manufacturing relies on metal alloys—metals that have been combined with other elements to enhance specific properties like strength, hardness, corrosion resistance, or machinability. In the world of industrial automation, machinery, and precision tooling, alloys form the backbone of countless components. At MISUMI USA, customers most frequently use stainless steel, carbon steel, aluminum alloys, and tool steels. Stainless steel is valued for its corrosion resistance and clean appearance, making it ideal for cleanroom and food-grade applications. Carbon steel offers a strong, cost-effective option for structural and general-purpose use. Aluminum alloys are favored for their lightweight and high machinability, while tool steels—like SKD11 or SKH51—are essential in die components and high-wear tooling environments.
This article explores what alloys are, how they’re made, the most common types used in manufacturing, and why selecting the right alloy is critical to product performance and longevity.
What are Alloys?
At their simplest, alloys are metals that have been mixed with one or more other elements to change or improve their properties. The goal is to make a material that performs better than a pure metal alone. For example, adding a small amount of carbon to iron creates steel, which is much stronger and more durable than iron by itself.
Alloys are usually made to solve a specific problem—maybe the base metal is too soft, rusts too easily, or can’t handle high temperatures. By combining it with other elements, manufacturers can adjust things like hardness, corrosion resistance, electrical conductivity, or weight.
There are two main types of alloys: ferrous (iron-based, like steel and cast iron) and non-ferrous (not based on iron, like aluminum alloys, brass, or bronze). Each has its own set of strengths and tradeoffs, and they’re chosen based on what the part needs to do and the environment it’ll be used in.
Brief History of Metal Alloys
The use of metal alloys goes back thousands of years. One of the earliest known alloys is bronze, a combination of copper and tin. It was first developed around 3000 BCE and gave rise to what we now call the Bronze Age. People quickly realized that bronze was harder and more durable than pure copper, making it better for tools, weapons, and building materials.
- Later came the Iron Age, when blacksmiths began working with iron and discovered that adding small amounts of carbon made it much stronger—this was the beginning of steel. Over time, more advanced techniques were developed to refine these mixtures and control their properties more precisely.
- In the 19th and 20th centuries, as industry and science progressed, engineers began creating a wide range of new alloys to meet specific needs—stronger steels for buildings and bridges, lightweight aluminum alloys for aircraft, corrosion-resistant stainless steel for chemical and food equipment, and heat-resistant nickel alloys for engines.
- Today, alloy development is a highly specialized field, and nearly every metal product we use is made from some form of alloy, tailored for its job through careful control of chemistry and processing.
How are Alloys Made?
The general goal of making an alloy is to combine specific elements in controlled amounts to achieve the best possible performance for a particular use—whether that’s strength, corrosion resistance, machinability, or temperature tolerance. Heat and mixing are the first and main steps, and then it goes from there:
Melting and Mixing:
- The base metal (like iron, aluminum, or copper) is heated until it becomes molten.
- Additional elements—other metals or non-metals like carbon—are added to the liquid metal.
- The mixture is stirred or agitated to ensure even distribution of elements.
- Once fully combined, the molten alloy is poured into molds or cast into basic shapes.
Shaping and Forming:
- After cooling, the alloy is often rolled, forged, or drawn into usable forms like bars, sheets, rods, or custom shapes.
- Some alloys are cold-worked (shaped without reheating) to strengthen them through internal structural changes.
Heat Treatment (if needed):
- Many alloys go through heat treatments like quenching, tempering, or annealing.
- This step adjusts hardness, toughness, and other mechanical properties depending on the application.
Advanced Methods:
- Powder metallurgy: Metal powders are mixed, compressed, and heated to form solid parts without melting.
- Vacuum melting and remelting: Used for high-purity or high-performance alloys in industries like aerospace and medical.
- Additive manufacturing (metal 3D printing): An emerging method for creating complex alloy parts layer by layer.
Most Common Alloys
Alloys come in all kinds of combinations, but a few types show up more often than others in manufacturing. These are some of the most widely used:
- Steel
Steel is made by adding a small amount of carbon to iron. That one change makes the metal much stronger and harder than pure iron. There are lots of types of steel, depending on how much carbon is added and whether other elements like chromium, nickel, or molybdenum are included. It’s used in everything from construction and tools to machine frames and gears.
- Stainless Steel
This is a type of steel that includes chromium—usually at least 10.5%. The chromium creates a thin layer on the surface that protects the metal from rust. Stainless steel is popular in clean environments like food processing, labs, and medical equipment, but it’s also common in industrial settings where corrosion is a concern.
- Aluminum Alloys
Aluminum on its own is lightweight and resists corrosion, but it’s also pretty soft. When mixed with small amounts of copper, magnesium, silicon, or zinc, it becomes much stronger while staying light. These alloys are widely used in aerospace, automation equipment, and structural parts that need to be strong without adding much weight.
- Brass
Brass is made by combining copper and zinc. It’s easy to machine, has good electrical conductivity, and resists corrosion. It’s often used in fittings, valves, electrical connectors, and decorative hardware.
- Bronze
Bronze is mainly copper with a bit of tin, though modern versions can include other elements too. It’s known for its durability, resistance to wear, and low friction. You’ll see it used in bushings, bearings, springs, and marine hardware.
- Tool Steels
These are special steels made for cutting, forming, and shaping other materials. They include elements like tungsten, molybdenum, vanadium, and chromium to improve hardness and heat resistance. Common types include SKD11 (used for dies) and SKH51 (a high-speed steel). These are critical in stamping, molding, and other high-wear applications.
- Titanium Alloys
Titanium is strong, light, and resists corrosion—even in harsh environments. When alloyed with aluminum or vanadium, it becomes even tougher. These alloys are mostly found in aerospace, medical implants, and high-performance industrial parts where weight and durability both matter.
Comparison of Physical Properties of Common Alloys
Comparison of Chemical Properties of Common Alloys
Top 5 Applications of Alloys Within Manufacturing
- Automotive Manufacturing
Key Alloys: Steel alloys, aluminum alloys, magnesium alloys
Uses: Engine components, frames, wheels, and body panels
Why: Alloys provide strength, corrosion resistance, and reduced weight for better fuel efficiency and safety.
- Aerospace Industry
Key Alloys: Titanium alloys, nickel-based superalloys, aluminum-lithium alloys
Uses: Aircraft fuselages, turbine blades, engine components
Why: High strength-to-weight ratios and heat resistance are essential for performance and safety in extreme conditions.
- Tool and Die Making
Key Alloys: High-speed steel (HSS), tungsten carbide, tool steels
Uses: Cutting tools, molds, dies, and punches
Why: These alloys maintain hardness and cutting edges under extreme pressure and heat.
- Construction and Infrastructure
Key Alloys: Structural steel, stainless steel, rebar alloys
Uses: Bridges, buildings, pipelines, and reinforcing bars
Why: Structural alloys offer durability, load-bearing strength, and corrosion resistance.
- Medical Devices and Implants
Key Alloys: Titanium alloys, cobalt-chromium alloys, stainless steel
Uses: Joint replacements, surgical instruments, dental implants
Why: Biocompatibility, non-reactivity, and durability are crucial for safety and longevity inside the human body.
Parting Thoughts
MISUMI USA offers a wide range of components made from metal alloys—everything from aluminum extrusions and pipe fittings to ball bearings, bushings, and more. If you’re interested in learning more about how alloys are used in manufacturing, feel free to explore other articles on our blog. And if you have a project in mind or specific questions about materials or part selection, our team of engineers and product specialists is always here to help.