close
Choose Your Site
Global
Social Media
904L /1.4539/N08904
904L is a Molybdenum and Copper Alloyed Cr-Ni austenitic stainless steel with low Carbon content.
Its specific characteristics are:
Austenitic micro structure.
High resistance to:
Pitting and crevice corrosion.
Stress corrosion and corrosion fatigue.
Uniform corrosion.
Good ductility and weldability.
INSPECTION STANDARDS
Europe
EN 10217-7 Welded SS tubes for pressure purposes
EN 10296-2 Welded SS tubes for general purposes.
USA
ASTM A 249 Welded Austenitic SS Heat Exchanger Tubes
ASTM A 269 Welded and seamless Austenitic SS Tubing
ASTM A 312 Welded and seamless Austenitic SS Pipes
ASTM A 358 EF Welded Austenitic Pipe with filler metal
ASTM B 673 Welded Pipe
ASTM B 674 Welded Tube
CHEMICAL COMPOSITION, %
| Grade | Cmax | Cr | Ni | Mo | Cu | PRENmin |
| 904L | 0.020 | 19.5-20.5 | 19.5-20.5 | 24.0-26.0 | 1.2-2.0 | 35.0 |
| EN 1.4539 | 0.020 | 19.0-21.0 | 19.0-21.0 | 24.0-26.0 | 1.2-2.0 | 35.0 |
| UNS N08904 | 0.020 | 19.0-23.0 | 19.0-23.0 | 24.0-28.0 | 1.2-2.0 | 35.0 |
Cold forming
Excellent cold forming properties. The same properties as for other standard
austenitic stainless steels.
Hot forming
904L is slightly harder at higher temperatures than austenitic standard
grades. Forming at temperatures in the range 1000-1200 C does not require
any post heat treatment, if the operation is followed by a reasonable
fast cooling, (>600C/min).
Heat treatment
1120-1180 C followed by rapid cooling to at least 700 C. At
temperatures between 900-800 C, intermetallic phases that impair the
properties will form within a few minutes.
APPLICATIONS
Chloride containing environments
Heat exchanger tubes
Pipe systems within
Chemical and Petrochemical
Hydrometallurgy
