304 Stainless Steel Uses, Advantages, Properties

304 Stainless Steel: Uses, Advantages, Properties

In our daily lives, many products are made from 304 stainless steel. For example, the water bottle we use often has a clear 304 mark at the bottom. How much do you know about 304 stainless steel?

304 Mark

What is 304 stainless steel?

What is 304 stainless steel

304 stainless steel is a grade of stainless steel according to the American ASTM standards. It’s the most widely used stainless steel and heat-resistant steel.

304 stainless steel is equivalent to China’s 0Cr19Ni9 (0Cr18Ni9) stainless steel. It contains 19% chromium and 9% nickel, which are the defining elements for 304 stainless steel.

 

What are other equivalents of AISI 304?

X5CrNi18-10, EN 1.4301, DIN 1.4301, UNS S30400, BS 304S15, BS 304S16, BS 304S31, BS EN58E

 

What is Chemical composition of AISI 304 and What are the uses of these Chemical elements?

What is Chemical composition of AISI 304 and What are the uses of these Chemical elements

ELEMENT WEIGHT USAGE
Iron 66.74 – 71.24% (Balance) It is the base element of 304, which contribute to basic mechanical properties and magnetic characteristics:
Chromium 17.5 – 19.5% It is the main alloy element and provide good corrosion resistance and oxidation resistance
Nickel 8 – 10.5% Another alloy element,
It provides good ductility and toughness
Manganese 2% It enhances strength and toughness.
Silicon 1% It improves oxidation resistance and high-temperature resistance
Nitrogen 0.11% It improves strength and pitting corrosion resistance.
Carbon 0.07% It increases strength and hardness but decreases ductility and toughness.
Phosphorus  0.05% It increases strength and hardness but decreases ductility and toughness
Sulphur 0.03% It improves machinability but reduces hot working performance and corrosion resistance

Which industries are 304 stainless steel used for?

Food Processing

Such as piping system, beverage equipment, storage tanks

Food Processing

Household Items

Such as kitchen appliances, sinks

Chemical Equipment

chemical processing equipment, reactors, and storage tanks

Medical Instruments

medical instruments, surgical tools, and implants

Construction Materials

handrails, windows, and decorative elements

Construction Materials

 

What are the advantages of 304 stainless steel?

Excellent corrosion resistance

Due to its high chromium and nickel content, 304 stainless steel can form a stable passive film in various environments, preventing further oxidation and corrosion.

Excellent oxidation resistance

Due to its high chromium and nickel content, 304 stainless steel can maintain a stable oxide film at high temperatures, preventing oxidation and corrosion under high temperature conditions.

Excellent ductility and toughness

Excellent ductility and toughness

with its high nickel content, 304 stainless steel can maintain an austenitic structure, offering good toughness even at low temperatures. This allows for both cold and hot forming processes.

Excellent processing performance

 With low levels of impurities such as carbon, sulfur, and phosphorus, 304 stainless steel can be easily machined through processes like cutting, welding, and bending, without prone to cracking or embrittlement.

Excellent surface finish

Thanks to its high chromium and nickel content, 304 stainless steel can achieve a bright surface finish, resistant to contamination and discoloration

 

Conclusion

Conclusion

304 is a stainless steel material with excellent overall performance. But it also has limits. When the products are used in seawater or high temperature environments, BT can provide other stainless steel like 316/316L/321 for your better choice based on the different applications.

 

FAQs about AISI 304 Stainless Steel

Is AISI 304 the same as SUS 304?

AISI 304, SS 304, SAE 304, and SUS 304 all refer to the same material but are labeled differently depending on the context in which they are cited.

SUS304, also known in the industry as 18/8 stainless steel, has a density of 7.93 g/cm³ and is a common material in everyday life.

Is AISI 304 the same as SUS 304

AISI 304 is a type of stainless steel that meets the American 304 standard. It has excellent resistance to intergranular corrosion in oxidizing acids, making it widely used in industrial applications.

 

Is AISI 304 magnetic?

304 stainless steel is non-magnetic in its annealed condition. However, after cold working processes such as stamping, drawing, bending, or rolling, some of its austenitic structure can transform into martensite, resulting in a slight magnetic property.

 

How to calculate the weight of 304 plates?

How to calculate the weight of 304 plates

To calculate the weight of a 304 stainless steel sheet, you first need to know its density, which is 7.93 g/cm³. The formula to calculate the weight of a 304 stainless steel sheet is:

weight (kg)=Thickness (mm)×Width (m)×Length (m)×Density (7.93 g/cm³)

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