ThePipingMart Blog Grades 318 Stainless Steel – Composition, Properties, and Uses

318 Stainless Steel – Composition, Properties, and Uses

316h stainless steel properties and uses

Stainless steel 318 is an incredibly useful material. It has impressive strength, durability, and corrosion resistance, making it ideal for various applications. Of all stainless steel, grade 318 is considered one of the most useful options due to its unique combination of properties. In this blog post, we’ll explore the properties and uses of 318 stainless steel.

What Forms is 318 Stainless Steel Available at Piping Mart?

  • Bars
  • Bolts
  • Pipes
  • Screw
  • Tubing
  • Valves
  • Washers
  • Flanges
  • Fasteners
  • Electrodes
  • Stud Bolts
  • Sheet Plates
  • Pipe Fittings

318 Stainless Steel Composition

SS 318 , commonly referred austenitic nickel-based stainless steel alloy. It has a composition of balanced Chromium and Nickel, combined with a high level of Molybdenum for superior corrosion resistance. This material is exceptionally hard, making it ideal for use in demanding applications such as marine and automotive engineering. It is also highly resistant to oxidation and corrosion from exposure to seawater and hot gases. In conclusion, Inconel sheet boasts unparalleled strength and toughness under extreme temperatures or conditions, making it the go-to material for industries that require reliable performance in harsh conditions.

318 Stainless Steel Physical Properties

318 stainless steel is an ideal product to use when seeking metal with high-performing physical properties. This type of stainless steel has a wide working temperature range, possesses excellent weldability and good formability capabilities, and has the ability to resist oxidation at higher temperatures. Additionally, its higher carbide levels make it strong enough to survive extreme levels of stress without deforming or breaking easily. Considering these impressive physical properties, this type of Inconel sheet can be used in fabricating complex mechanical structures as well as creating stable parts for use in more hazardous projects such as those found in aerospace engineering or chemical processing.

318 Stainless Steel Mechanical Properties

318 stainless steel can be used in a variety of applications due to the mechanical properties they possess. They are known for having a high strength-to-weight ratio, superior corrosion resistance, and good welding characteristics. Additionally, these sheets are known for their outstanding creep strength, making them ideal for applications such as fastener components and turbine blades. Furthermore, Inconel sheets manufactured with 318 stainless steel offer greater thermal stability, allowing for longer life expectancy and minimal maintenance. Making use of 318 stainless steel can help greatly with extending the lifespan of a product before it needs replacing or service.

318 Stainless Steel Properties

Grade 318 stainless steel is a type of austenitic stainless steel. This means that it has a higher chromium and nickel content than other types of stainless steel. Grade 318 is composed of around 18% chromium and 10% nickel, giving it superior corrosion resistance compared to other types of stainless steel, such as 304 or 316. As well as having excellent corrosion resistance, grade 318 also offers a number of other useful properties, including high tensile strength, good flexibility, and ease of fabrication.

General Properties

318 Stainless is a chromium-nickel austenitic stainless steel with molybdenum added. With its relatively low carbon content of 0.03%, 318 stainless steel is the most economical choice of all the chromium-nickel austenitic grades. It has good corrosion resistance in mild environments and good formability and weldability.

Corrosion Resistance

318 Stainless Steel has good corrosion resistance in mildly corrosive environments and is more resistant to corrosion than 304 stainless steel. However, it is not as resistant to corrosion as 316 stainless steel.

Heat Resistance

318 Stainless Steel has a good heat resistance and is more resistant to high temperatures than 304 stainless steel. However, it is less resistant to high temperatures than 316 stainless steel.

Formability and Weldability

AISI 318 has good formability and weldability. It can be formed by cold working and welded by the most common welding methods. However, it is not as easily welded as 304 or 316 stainless steel.


318 Stainless Steel is typically used in food processing equipment, chemical process vessels, paper mills, heat exchangers, oil refinery tubes, power generation turbines, and boiler tubes. It is also sometimes used in medical implants and aerospace applications

318 Stainless Steel Specifications

  • ASTM A959 (2004)
  • A276
  • A312
  • A632
  • A176
  • A580

318 Stainless Steel Uses

The unique combination of properties offered by grade 318 makes it suitable for many different applications across various industries. For example, it is commonly used in medical equipment due to its excellent corrosion resistance and ability to withstand extreme temperatures without losing its structural integrity. It is also often used in food processing equipment due to its high hygiene and cleanliness requirements. This type of stainless steel can also be used in chemical processing plants where highly corrosive materials are present due to its excellent corrosion resistance properties. Finally, grade 318 can also be found in aerospace components due to its high strength-to-weight ratio, making it ideal for lighter components that must remain strong under pressure or extreme temperatures.


Grade 318 stainless steel has several benefits that make it an extremely useful option for many different applications across a range of industries. Its high strength-to-weight ratio, excellent corrosion resistance, and flexibility make it ideal for medical equipment, food processing equipment, chemical processing plants, and aerospace components. Whatever your industry or application may be, grade 318 could be the perfect choice for you!

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