Stainless Steel Grade 304

Considered to be one of the most popular steel alloys because of its adaptability, parts forged in stainless steel grade 304 are highly sought after. This alloy mostly consists of chromium (Cr) (18% – 20%) and nickel (Ni) (8.0% – 12%). Other elements that make up stainless steel 304 include manganese (Mn), silicon (Si), phosphorous (P), sulfur (S), and nitrogen (N). Stainless steel grade 304 is classified as UNS S30400.

There are three classes of grade 304 stainless steel – 304, 304L and 304H. All classes contain roughly the same amount of chromium and nickel – though 304 contains less nickel then 304L. The main difference lies within the amount of carbon (C) used for these classes. At Weldaloy, we forge low carbon or carbonless stainless steel alloys – for 304 grade stainless steel, we forge parts in 304 and 304L and not in 304H. 

Known for its incredible strength at lower weight, and excellent corrosion and oxidation resistance, stainless steel 304 is used in a variety of industries, including aerospace, marine, and the food industry.

Chemical Compostion

(%max., unless shown as range or min.)

304 Cr Ni Mg Si C N P S Fe
Min./Max.
18.0 - 20.0
8.0 - 10.5
2.0
0.75
0.08
0.10
0.045
0.03
Balance
304L Cr Ni Mg Si C N P S Fe
Min./Max.
18.0 - 20.0
8.0 - 12.0
2.0
0.75
0.08
0.10
0.045
0.03
Balance

Applicable Specifications

Product Specification
Forgings - Rolled Rings
ASME SA-182, ASTM A 182, ASTM A 240, ASTM A 276, ASTM A 473, ASTM A 829

Common Fabrication Processes

  • Jet and engine rocket components
  • Kitchen and food equipment
 

Industries that use Stainless Steel Grade 304 Forgings:

  • Aerospace and Aviation Engineering
  • Chemical and Petrochemical 
  • Food Industry
  • Marine
  • Oil and Gas
  • Power Generation 
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