An Expert’s Guide to Stainless Steel 904l Plates

stainless steel 904l plates
An Expert’s Guide to Stainless Steel 904l Plates

If you’re in the market for stainless steel plates, you’ve probably come across the term 904L. While it may seem like just another type of stainless steel, this grade has unique properties that make it stand out. In this expert’s guide, we’ll explore everything there is to know about stainless steel 904L plates, from their composition to their applications.

What is Stainless Steel 904l Plates?

Stainless Steel 904l Plates are high-alloy austenitic stainless steel plates that offer superior corrosion resistance due to higher amounts of chromium, nickel and molybdenum. The increased alloying elements improve strength, pitting and crevice corrosion resistance compared to conventional 304/304L grade stainless steels, allowing them to be used in more aggressive environments. Furthermore, its excellent weldability makes it a popular choice for use in applications such as chemical processing equipment.


Firstly, let’s talk about the composition of stainless steel 904L plates. This grade of stainless steel is a non-stabilized austenitic stainless steel with low carbon content. It contains high levels of chromium, molybdenum, and nickel, which help to make it extremely resistant to corrosion. Additionally, 904L contains copper, which increases its resistance to strong reducing acids, such as sulphuric acid.

Due to its excellent corrosion resistance, stainless steel 904L plates are commonly used in harsh environments such as chemical and oil refineries, pharmaceutical plants, and seawater applications. 904L plates are often used in heat exchangers and piping systems in marine environments that demand high performance and reliability.

Benefits of stainless steel 904L plates

One of the unique benefits of stainless steel 904L plates is their ability to resist stress corrosion cracking. This type of corrosion occurs when a material is subjected to tensile stress and a corrosive environment. This can lead to small cracks forming in the material, ultimately leading to failure. However, due to the addition of molybdenum and copper, 904L is highly resistant to stress corrosion cracking, making it an ideal material for harsh environments.

Another benefit of 904L plates is their high resistance to pitting and crevice corrosion. These types of corrosion occur when a material is exposed to high concentrations of chloride ions, which can cause localized breakdowns in the protective oxide layer of the metal. However, with its high nickel and chromium content, 904L is extremely resistant to chloride ion-induced corrosion, making it ideal for seawater environments.

Processing and fabricating stainless steel 904L plates

Lastly, let’s discuss processing and fabricating stainless steel 904L plates. Due to its high nickel and chromium content, 904L is a tough material. However, the right tools and processes can be cut, welded, and formed to meet specific requirements. The correct welding procedures must be followed to ensure the material retains its corrosion resistance, and stress relief is used to prevent deformation.

Physical Properties of Stainless Steel 904l Plates.

Stainless Steel 904l Plates offer great strength and durability. Here are its key physical properties:

High tensile strength – 904L grade stainless steel is very strong, with a minimum yield strength of 220 MPa and a minimum tensile strength of 515 MPa;

Low thermal expansion coefficient – 904L has the lowest coefficient of thermal expansion among austenitic stainless steels, making it ideal for applications that require high dimensional stability;

Corrosion resistance – It’s highly resistant to corrosion in both acidic and alkaline environments, making it ideal for many corrosive applications;

Formability & weldability- It can be easily formed into various shapes as well as welded using conventional welding techniques on any type of workpiece without preheating or post-heat treatment;

Excellent chemical resistance: Its high chromium content makes it highly resistant to acids, chlorides and other chemicals at room temperature.


In conclusion, stainless steel 904L plates are an excellent choice in harsh environments that demand high performance and durability. With its unique properties, including high resistance to stress corrosion cracking, pitting and crevice corrosion, and its ability to resist strong reducing acids, 904L is highly sought after by industries such as chemical, oil and gas, and marine. Choosing the right material for your application is crucial, and 904L is a reliable option that delivers exceptional results cost-effectively.