ASTM 304 Stainless Steel: The Universal Workhorse of Austenitic Alloys

Introduction to Grade 304 Stainless Steel

Grade 304 is an austenitic stainless steel, part of the 18-8 family, meaning it contains approximately 18 percent chromium and 8 percent nickel. This balance of chromium and nickel provides excellent corrosion resistance while maintaining ductility and ease of fabrication.

Grade 304 is also known as:

UNS S30400

EN 1.4301

AISI 304

It is available in various forms including sheets, plates, bars, pipes, and fittings, making it suitable for countless applications.

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Key Features of Grade 304 Stainless Steel

Excellent Corrosion Resistance
The high chromium content allows 304 to form a passive oxide layer that protects against rust and corrosion in most environments.

Good Mechanical Properties
It provides a balance of strength and toughness across a wide range of temperatures.

Ease of Fabrication
304 can be easily formed, welded, and machined, making it adaptable for complex designs.

Hygienic and Easy to Clean
The smooth surface of stainless steel is ideal for sanitary environments like food and medical industries.

Affordable Compared to Other Alloys
While offering excellent performance, 304 is more cost-effective than higher alloyed grades such as 316 or 317L.