ER 304 is a common designation for a stainless steel welding filler metal (wire or rod) used to join 304-type stainless steels, offering excellent corrosion resistance, good strength at high temperatures, toughness at cryogenic temperatures, and suitability for food processing and chemical equipment due to its chromium-nickel composition (around 19%Cr-10%Ni) and stable arc characteristics, making it versatile for MIG (GMAW) and TIG (GTAW) welding in various positions.
Key Characteristics
Composition: Austenitic (non-magnetic in annealed state) stainless steel, typically 19% Chromium, 10% Nickel.
Corrosion Resistance: Superior resistance to many chemicals, moisture, and food products, with low carbon content (especially in 304L) preventing carbide precipitation and intergranular corrosion, says www.arihantmetal.net.
Mechanical Properties: Good strength at high temperatures, toughness at cryogenic temperatures, and excellent elongation, notes www.metalfed.com and www.arihantmetal.net.
Weldability: Provides a stable arc, low spatter, easy slag removal, and good bead formation, allowing all-position welding for many applications, according to Made-in-China.com and tianyu.en.made-in-china.com.
Common Applications
Welding base metals like 304, 304L, and 302 stainless steels.
Food processing equipment, chemical tanks, and pharmaceutical manufacturing.
Pipe welding, sheet metal work, and general industrial fabrication.
Welding Considerations
Shielding Gas: Typically pure Argon for TIG or Argon/CO2 mixes for MIG.
Current: DC electrode positive (DCEP) is often used.
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