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.
EN 10217-7 Welded SS tubes for pressure purposes
EN 10296-2 Welded SS tubes for general purposes.
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
|
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 |
Excellent cold forming properties. The same properties as for other standard
austenitic stainless steels.
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).
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.
Chloride containing environments
Heat exchanger tubes
Pipe systems within
Chemical and Petrochemical
Hydrometallurgy