904L stainless steel wire mesh is a superaustenitic stainless steel alloy originally developed to have excellent corrosion resistance to environments containing dilute sulfuric acid.
Today, it is used in a broad range of different process environments, including in both inorganic and organic acid settings. With high chromium (21%), nickel (25.5%), molybdenum (4.5%), and copper (1.5%) content, 904L stainless steel wire mesh possesses great resistance to general corrosion. Its chromium and molybdenum additions further provide 904L with superior resistance to general corrosion, pitting, and chloride stress corrosion cracking as compared to T-316L. In cases where cost is a factor, 2205 duplex is often substituted for 904L given its similar corrosion resistance, higher mechanical strength, and lower cost (keep in mind, however, 2205 duplex should not be used above 570°F). In cases where both higher corrosion resistance and strength are required, 2507 super duplex or ZERON® 100 super duplex are often substituted in place of 904L. Some characteristics of 904L stainless steel wire mesh which dictate its use are:

Superaustenitic 904L stainless steel wire mesh.
Non-magnetic in all conditions.
Withstands outdoor exposure without rusting.
Good fatigue strength & excellent corrosion resistance in severe industrial and chemical settings.
Good resistance to inorganic acids (i.e. hot phosphoric acid) as well as most organic acids.
Lower resistance to nitric acid vs. T-304L (which is free of molybdenum).
Best used in temperatures below 750°F (undergoes embrittlement at higher temperatures).
Easily welded, more difficult to cut and form than T-316L (thus, higher cutting forces are required).

Specification parameter:
1. Raw material: sus 904 904L
2. Mesh count: 1-400mesh
3. Features: superior corrosion resistance in the non-oxidizing acid such as sulfuric acid, acetic acid, formic acid, phosphoric acid.
4. Applications: widely used in the sea-water treatment filtering industry.
Applications:
In acid, alkali environment conditions sieving and filtering.
Petroleum industry as mud mesh.
Chemical fiber industry as screen mesh.
Plating industry as acid cleaning mesh.

Industries & Applications
904L stainless steel wire mesh is primarily used in chemical/petrochemical, food processing, and oil field/refinery industries. Additional industries and applications which commonly use 904L stainless steel wire cloth include: 

Architectural (seashore/urban areas)
Biofuel Plants
Boat/Yacht Fittings
High Chloride Environments
Liquid Filtration & Particle Separation
Marine Applications
Power Plant
Textile
Wastewater Treatment
Common Aliases

904L stainless steel is also commonly referred to as:
UNS N08904
904L Stainless
1.4539 Stainless

HS code:7314140000

Related article: 321 Stainless Steel Wire Mesh