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An Overview of 321 Stainless Steel Circle Plate

Are you looking for a metal plate that can withstand high temperatures? Then 321 stainless steel circle plate is the perfect material for your project. This type of metal plate is made from a stainless steel alloy optimized for use in extreme temperature environments, making it an ideal choice for applications like welding, food processing, and aerospace. Let’s look at what makes this type of metal plate so unique

What is 321 Stainless Steel?

321 stainless steel is one of the most popular grades of stainless steel. It is well known for its excellent corrosion, durability, and heat resistance. This grade of stainless steel is often used in applications such as pressure vessels, chemical processing equipment, and food processing equipment. Let’s take a closer look at the properties of this exciting material.

Chemical Composition

321 stainless steel contains an alloying element called titanium. This addition gives it superior strength and corrosion resistance compared to other grades of stainless steel. The chemical composition of this grade also includes chromium (17-19%), nickel (9-12%), iron (67-72%), carbon (0.08%), phosphorus (0.045%), sulfur (0.030%) and manganese (2%).

Physical Properties

321 stainless steel has a density of 7.9 g/cm3, similar to 304 stainless steel. But slightly higher than 316 stainless steel. It also has a melting point between 2540°F – 2800°F / 1399°C – 1538°C and a high tensile strength between 80 ksi – 95 ksi / 550 MPa – 655 MPa, depending on the form it takes on. The yield strength for this grade ranges from 30 ksi – 40 ksi / 205 MPa – 275 MPa, depending on its shape. Additionally, 321 stainless steel has an elongation rate between 35% – 45%.

Key Highlighting Properties

  • It’s important to note that 321 stainless steel has a lower coefficient of thermal expansion than other grades of stainless steel due to its titanium content. Therefore, it will not expand or contract as much when exposed to changes in temperature as different types do. This property makes it ideal for high-pressure applications, such as power plants or chemical processing plants.
  • Due to its ability to maintain stability under these conditions.  Its excellent heat resistance also makes it perfect for use in the kitchen or food processing equipment where frequent exposure to high temperatures can occur; you won’t have to worry about the material warping or becoming distorted over time due to these conditions!
  • The 321 stainless steel is among today’s most versatile and durable grades. Its excellent corrosion resistance, durability, and heat resistance properties make it suitable for various applications, including pressure vessels, chemical processing equipment, and food processing equipment. Its low coefficient of thermal expansion also makes it ideal for use in areas where temperature fluctuations are typical.
  • At the same time, its high tensile strength ensures that it can withstand heavy loads without deforming or breaking down over time, as some other materials may do under similar conditions! With all these benefits combined, there’s no denying why 321 stainless steel continues to be so popular today!

stainless steel circle plates

What Is 321 Stainless Steel Circle Plate? 

A 321 stainless steel circle plate is a type of metal plate made from an alloy of iron, chromium, and nickel. It has been optimized for extreme temperature environments and contains titanium for added strength. The chromium content also helps increase the metal plate’s corrosion resistance.

Thus, making it suitable for wet or humid conditions. Additionally, because it contains titanium, the 321 stainless steel circle plate has an excellent strength-to-weight ratio, making it an ideal choice for applications where weight is a significant factor. 

Properties of 321 SS Circles

If you are in the market for stainless steel circle plates, then the 321 grade is an excellent option. This type of product is perfect for a variety of applications due to its combination of strength and corrosion resistance. Let’s look at some properties that make 321 stainless steel circle plates popular with fabricators and engineers.

Corrosion Resistance

Corrosion resistance is one of the essential qualities of 321 stainless steel circle plates. This metal alloy is renowned for its robust resistance to oxidation, rust, and other forms of corrosion. It is a beneficial choice for applications where strength, longevity, and safety are paramount, such as chemical and medical equipment.

With its superior corrosion protection, the 321 stainless steel circle plate can be used in various environments, including harsh chemicals or extreme environmental conditions. Additionally, this strong material has excellent heat resistance properties that make it a great option for high-temperature applications. Whether you’re looking for enhanced strength and durability or superior corrosion protection, 321 stainless steel circle plate offers an ideal solution.

Heat Resistant

321 stainless steel circle plate offers excellent heat resistance properties, making it an ideal choice for high-temperature applications. This robust metal alloy can withstand temperatures up to 1800°F (982℃) without significantly degrading its corrosion protection or mechanical strength.

Furthermore, 321 stainless steel does not become brittle at cryogenic temperatures and is also suitable for cryogenic applications. These excellent heat resistance qualities make 321 stainless steel circle plates exceptionally versatile and reliable, allowing them to be used in various settings. This metal is the perfect choice whether you’re looking for superior heat resistance or enhanced strength and durability.


321 stainless steel circle plate offers superior weldability and can be quickly joined to other metals by various methods. It is commonly used for welding applications because of its low carbon content, reducing the cracking risk during cooling. This metal alloy can be welded using traditional fusion and resistance welding techniques and with the most modern welding processes.

Additionally, it is compatible with many common filler materials, making it an ideal choice for many welding applications. With its superior weldability and enhanced strength and durability, the 321 stainless steel circle plate suits any project requiring high-quality results.

The 321 stainless steel circle plates offer the following: 

  • Superior strength
  • Heat resistance
  • Corrosion resistance properties

Thus, making them ideal for fabrication projects in various industries, including food processing equipment manufacturing, aerospace engineering, medical device production, and pharmaceutical processing equipment production. If you’re looking for a reliable material that will withstand harsh conditions, then 321 stainless steel circle plates should be at the top of your list!

Advantages of 321 Stainless Steel Circle Plates

Stainless steel circle plates are an essential part of many industrial manufacturing processes. They come in various sizes and grades of stainless steel, and one such grade—321 stainless steel—has several unique properties that make it particularly useful in specific applications. Here, we’ll take a closer look at this grade of stainless steel to understand its advantages and disadvantages better.

321 stainless steel is an austenitic grade of stainless steel that contains slightly more nickel than the standard 304 grade. Certain conditions result in its superior corrosion resistance, and it can be used for applications that require higher temperatures up to 800°C (1470°F). Its excellent weldability is also well-known, making it suitable for applications where welding may be necessary.

The most common uses for 321 stainless steel circle plates require high temperature-resistant materials. This use includes airplane exhaust systems, pipes used in the oil and gas industry, food processing equipment, medical instruments, and chemical processing plants. The material’s non-magnetic properties make it ideal for use in medical settings, near magnetic fields, or other sources of interference.

Few Drawbacks

One drawback to consider with 321 stainless steel circle plates is their cost. Since this material contains slightly more nickel than regular 304-grade stainless steel, it tends to be more expensive than other grades of stainless steel on the market today. However, it is worth the investment if your application requires the added heat resistance or non-magnetic properties offered by this particular grade.

Available Sizes of 321 Stainless Steel Circles

The 321 stainless steel circles are a versatile and cost-effective material for various applications. Different sizes, thicknesses, and diameters are available; people can use them for multiple projects. But how do you know which size is right for your needs? Read on to find out!

The Standard Size Range

The 321 stainless steel circles come in standard sizes that range from 12 inches to 36 inches in diameter. The standard thickness ranges from 0.125 inches to 0.250 inches thick. If you require something outside the expected range, it’s usually possible to order custom sizes.

What Size Do I Need?

Your 321 stainless steel circle size will depend on the intended application. For most projects, the standard size range should cover most needs, but if you’re unsure what size to use, there are several factors to consider:

Project Type – Different projects may call for different sizes or thicknesses of 321 stainless steel circles. For example, thinner circles are suitable for making pie plates or thin griddles, whereas thicker ones might work better for heat exchangers or other industrial components.

Material Strength – The strength of the material also affects the choice of size and thickness; thicker circles tend to be stronger than thinner ones with the same diameter. This thickness is essential when choosing a circle because its strength determines how much weight it can bear without breaking or becoming distorted over time.

Amount Needed – The amount needed will also influence your decision; if you only need one circle, any size within the standard range should work fine. But if you need more, larger diameters may be preferable as they may provide more material at a lower cost per unit than smaller diameters.

Many factors go into choosing the right size and thickness of 321 stainless steel circles for your project. Consider all your options before committing to one particular length, as this will ensure your project runs smoothly and efficiently without any unexpected hiccups along the way! With this guide in mind, finding the perfect fit should be easy!

Uses of 321 Stainless Steel Circle Plate

If you’re looking for a material that is resistant to corrosion and has excellent weldability, 321 stainless steel might be the right choice. This type of stainless steel is primarily used in high-temperature applications, such as aircraft exhaust systems, exhaust manifolds, and furnace parts. But what other uses are there for 321 stainless steel circle plates? Let’s take a closer look.

Construction Industry

Construction Applications

321 stainless steel circle plate is often used in construction applications due to its resistance to corrosion and heat. It can be used for many different projects, from handrails on stairs to window frames. Its resistance to corrosion means it won’t rust or corrode over time as other metals can. Its strength makes it ideal for structural applications where weight must be considered.

Circle plate marine applications

Marine Applications

Another use for 321 stainless steel circle plates is in marine applications such as boat hulls and propeller shafts. Due to its strong corrosion resistance, it’s an ideal material for these applications since they are constantly exposed to water and saltwater environments. Additionally, it has excellent weldability, so it can quickly be joined together without worrying about the joints becoming undone over time.

SS circle plate chemical industry

Chemical Processing

321 stainless steel circle plate has several uses in chemical processing plants due to its ability to resist corrosion and heat up to 1,900 degrees Fahrenheit (1,038°C). Due to its durability and strength, it is often used in reactors, heat exchangers, distillation columns, valves, and piping systems. Its weldability makes it extremely useful when welding components that need extra strength or pressure ratings, such as pipes and valves.

As you can see from this overview, 321 stainless steel circle plate has many uses across numerous industries, from construction to marine applications. Whether you need a material that can withstand high temperatures or one with excellent weldability properties—or both—321 stainless steel might be what you’re looking for! With its impressive resistance to corrosion and heat combined with its strength and easy weldability qualities. This type of stainless steel should be at the top of your list when considering materials for your project needs!


There’s no denying that 321 stainless steel circle plates can be handy depending on your application needs. Its corrosion resistance and weldability make it an excellent choice for high-temperature environments where welding may be necessary.

Additionally, its non-magnetic properties make it ideal for use in medical environments, near magnetic fields, or other sources of interference. Although they tend to be more expensive than different grades of stainless steel due to their high nickel content.

They are still worth investing in if you need the extra protection this type of metal plate offers.  Whatever your needs when considering purchasing a 321 stainless plate, you can rest assured that with proper care and usage, they will provide you with years of reliable service!

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