Understanding the Properties and Applications of J4 Stainless Steel

J4 Stainless Steel

J4 stainless steel is widely used in commercial and industrial settings because of its high corrosion resistance, which is the result of its specific chemical composition.

Since you are here, we can assume that you are interested in learning more about the characteristics and potential uses of this particular steel grade.

So, what are you waiting for? Let’s get started!

What is J4 Stainless Steel?

J4 stainless steel is predominantly made of iron and chromium, with trace amounts of other elements, making it a ferritic stainless steel.

You should know that Japan added the J4 grade of stainless steel to the family of stainless steel in the late 20th century. It was developed as part of the “fourth generation” of stainless steel, which sought to fix problems with earlier iterations.

The full meaning of the code J4 is “Japanese 4th generation,” indicating that this stainless steel was produced in Japan. The outstanding performance of J4 stainless steel, however, has led to its widespread adoption and widespread use.

J4 stainless steel is frequently used in a range of products, including industrial machinery, culinary appliances, and parts for automobiles. Several industries favor it because of its superior mechanical and corrosion-resistant qualities.

Properties of J4 Stainless Steel

 So, let’s take a look at the properties of J4 stainless steel, including its chemical and physical composition, high corrosion resistance, high ductility and toughness, high strength and hardness, and magnetism.

stainless steel j4 pipe

In terms of physical properties, J4 stainless steel has a density of around 7.8 g/cm³ and a melting point of around 1400-1425°C. It is non-hardenable stainless steel, which means that it cannot be heat-treated to increase its hardness. However, it can be work-hardened by cold working to increase its strength and hardness.

High Corrosion Resistance

You wouldn’t be inaccurate if you said that J4 stainless steel is anti-rust. J4 stainless steel’s high chromium content creates a barrier on the surface of the metal that stops rust and other types of corrosion from developing. As a result, J4 stainless steel is perfect for demanding settings like maritime or industrial applications where corrosion is a major problem.

J4 stainless steel can also resist Pitting and crevice corrosion. t Pitting and crevice corrosion are two common forms of localized corrosion that can arise in demanding environments For this reason, projects that call for a high level of corrosion resistance can trust J4 stainless steel.


High Ductility and Toughness

High ductility and hardness are hallmarks of J4 stainless steel. Materials with high ductility can bend without breaking under stress, whereas those with high toughness can take more punishment before cracking. J4 stainless steel’s high ductility and toughness make it simple to shape and weld without sacrificing the metal’s strength or resistance to corrosion.

This quality makes J4 stainless steel perfect for use in the automotive and manufacturing industries, where forming and welding are commonplace. Applications that demand great durability and long-term performance can trust it because of its high ductility and toughness, which make it resistant to cracking and deformation.

High Strength and Hardness

J4 stainless steel is a great option if you need a stainless steel grade with high strength and hardness. Because of its strength and resistance to deformation under stress, this steel grade is frequently used in the construction of buildings and the manufacturing of industrial machinery. Among the ferritic stainless steels, J4 has one of the highest tensile strengths, at up to 620 MPa.

As J4 stainless steel can reach a Rockwell hardness of 93, it is extremely scratch- and bend-resistant. Because of its longevity and resilience to wear and tear, J4 stainless steel is a great material for a wide variety of uses.

Due in part to its low carbon content, J4 stainless steel is able to provide exceptional strength and hardness. Carbon is a typical steel alloying ingredient; it makes the metal stronger and harder but also more brittle. J4 stainless steel is robust and ductile while having a low carbon content. Its mechanical qualities are also remarkable.


J4 stainless steel possesses exceptional qualities for ferritic stainless steel. The corrosion resistance and magnetic characteristics of ferritic stainless steels like J4 are well-known. Thanks to its strong ferromagnetism, J4 stainless steel can be magnetized with little effort and keeps its magnetism even after the magnetic field is turned off.

Because of its magnetic properties, J4 stainless steel can be quickly and easily sorted and identified throughout production. Because of its magnetic properties, J4 stainless steel is often detected and sorted using magnetic detection techniques.

When compared to other ferritic stainless steels like 430 and 434, J4 stainless steel is highly ferromagnetic, but not quite as magnetic. This is because its chemical makeup is different from the other grades. It has less iron and more chromium than those other grades.


Because of its excellent formability, J4 stainless steel may be easily molded into a wide variety of sizes and shapes without breaking or cracking. Because of this feature, it is frequently used in components for vehicles and home appliances with intricate shapes and geometries.


J4 stainless steel is one of the least expensive stainless steel options. This makes it a desirable option in contexts where the price is a primary consideration, such as in mass-produced consumer goods.

Industrial Application of J4 Stainless Steel

J4 stainless steel is a multipurpose material with many applications because of its unique properties. Some common applications of J4 stainless steel in the industry are:

surgical J4 stainless steel

  • Automotive industry: Due to its superior strength, durability, and corrosion resistance, J4 stainless steel is widely used in the automotive industry. Manufacturers use J5 steel for exhaust systems, mufflers, and other parts that will be exposed to high temperatures and corrosion.
  • Manufacturing industry: Pressure vessels, tanks, and pipe systems are some of the industrial tools made from J4 stainless steel in the manufacturing sector. Because of its cleanliness and durability, J4 stainless steel is also used to make appliances for the food industry.
  • Construction industry: Due to its durability, longevity, and resistance to corrosion, J4 stainless steel is widely utilized in the construction industry. It’s used to build things like monuments, skyscrapers, and suspension bridges.
  • Chemical industry: J4 stainless steel is highly used in the chemical industry, where high corrosion resistance is required. Reactors, tanks, and pipelines used in the chemical industry all require this material.

High strength, superior ductility, and great corrosion resistance make J4 stainless steel stand out in these applications. Since it contains relatively little carbon, it is also resistant to intergranular corrosion. In addition to being suitable for use in corrosive and high-temperature applications, J4 stainless steel can tolerate both high temperatures and harsh chemical conditions.

Types of J4 Stainless Steel


Knowing the characteristics of J4 stainless steel can help you select the best material for a given task.

  • Sheet: J4 stainless steel sheet has a wide range of applications, from automobile parts to home appliances and building cladding. Sheets of J4 stainless steel come in a wide range of thicknesses and can be easily fabricated into custom shapes.
  • Coil: J4 stainless steel coil is a long, unbroken strip of metal that has been coiled up for convenient storage and transport. Automotive parts, industrial machinery, and electrical wiring all make use of coils of J4 stainless steel.
  • Tube: This cylindrical material has many different uses, from heat exchangers and chemical processing equipment to building framework. J4 stainless steel tube can be found in a wide range of diameters and wall thicknesses, and it can be fabricated into any length.
worker with helmet in production hall in front of steel sheet metal profiles
worker with helmet in production hall in front of steel sheet metal profiles
  • Rod: J4 stainless steel rod is a popular, adaptable material that may be utilized in a wide range of applications, including construction, transportation, and industry. You can obtain J4 stainless steel rod in a variety of diameters and lengths, and then have it cut to your specifications.
  • Angle: J4 stainless steel angle is an L-shaped material utilized for a variety of applications, including building construction, industrial machinery, and vehicle components. J4 stainless steel angle is available in a variety of thicknesses and can be cut to any length.
  • Strip: J4 stainless steel strip is a thin, flat material used for a wide range of applications, including but not limited to automotive components, industrial machinery, and electrical devices.
  • Flat Bar: J4 stainless steel flat bar, often known as “flat bar,” is a rectangular, flat material having a variety of applications in construction, industry, and the automobile sector, among others. J4 stainless steel flat bar is available in a variety of widths and thicknesses and can be cut to any length.

J4 Stainless Steel versus Other Steel Grade

How does the high-grade effectiveness of J4 stainless steel compare to the effectiveness of other grades of stainless steel? Let’s find out.

J4 vs J1

J1 stainless steel is an older generation of ferritic stainless steel that contains a higher amount of carbon than J4. This makes J1 steel harder and more brittle than J4. J4 stainless steel has a lower carbon content, making it easier to form and weld while still retaining excellent corrosion resistance. J4 also has better ductility than J1, making it a better choice for forming operations.

J4 vs J2

J2 stainless steel is a high-strength variant of ferritic stainless steel that contains a higher amount of molybdenum than J4. This gives J2 steel better resistance to pitting and crevice corrosion, but it is also more expensive than J4. J4 stainless steel is an excellent low-cost alternative to J2 for applications where high strength is not required.

J4 vs J3

J3 contains more silicon and less chromium than J4, which makes it less corrosion-resistant. J4 stainless steel is a better choice for applications where corrosion resistance is critical.

Austenitic stainless steel

Compared to austenitic stainless steels like 304 and 316, J4 stainless steel has lower corrosion resistance but higher magnetic permeability. It is also less expensive than austenitic steels, making it a good choice for cost-sensitive applications. Compared to martensitic stainless steels like 410 and 420, J4 stainless steel has better corrosion resistance and is easier to form and weld.

J4 stainless steel offers a favorable blend of corrosion resistance, formability, and affordability, making it a desirable material for a variety of applications. Its low carbon percentage makes it easier to shape and weld, while its high chromium content gives superior corrosion resistance.


Can J4 stainless steel be classified as food-safe?

Yes, J4 stainless steel is food-safe i.e safe for food contact. It is less susceptible to corrosion and contamination from food acids due to its low carbon content, and it is also simple to clean and maintain. Owing to its resistance to corrosion, tensile strength, and sanitary qualities, J4 stainless steel is frequently utilized in the manufacture of food processing equipment.

How much is J4 stainless steel?

Market conditions and other factors including the grade, size, and quantity of the material purchased can all affect the price of J4 stainless steel. Because of its particular qualities and applications, J4 stainless steel may command a greater price than other grades of stainless steel.

What exactly differentiates J4 from SS304?

Although both J4 stainless steel and SS304 (or AISI 304) are types of stainless steel, their chemical compositions and characteristics are slightly different. J4 stainless steel’s increased corrosion resistance and durability under extreme conditions are the result of its higher nickel content compared to that of SS304.

Since J4 stainless steel contains more nickel than SS304, it offers better corrosion resistance and is better suited for usage in challenging conditions. Nonetheless, SS304 is more suited for usage in high-temperature applications than J4 stainless steel due to its greater levels of chromium and carbon. In addition, it may be easily shaped and welded.


Feel free to get in touch with us if you have any inquiries about the properties, applications, or availability of J4 stainless steel.

Our team can help you explore the possibility of J4 stainless steel for your business’s needs.

One Stop Stainless Steel Supply.

Whether you need stainless steel materials for your business or fabrication projects, TuoLian is your best supplier. You can find all types, grades, and thicknesses based on your needs. Guaranteed that we provide the best quality at a reasonable cost.
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