EN 1.4539 / UNS N08904 / 904L
MATERIAL DESCRIPTION
AISI 904L is a high nickel – molybdenum austenitic stainless steel with a very high corrosion resistance specifically for handling medium concentrated sulfuric acid solutions. Good weldability and excellent formability.
Applications
AISI 904L is a high alloy low carbon austenitic stainless steel with good general corrosion resistance. EN 1.4539 is fully austenitic but is less sensitive to precipitation of sigma phase than conventional austenitic grades with high molybdenum content.
Areas of applications are process equipment in chemical industry, petrochemical industry, bleaching equipment in the pulp and paper industry, flue gas cleaning, desalination, seawater handling, hydrometallurgy, food and beverage, pharmaceuticals and heat exchangers.
Heat Treatment
Solution annealing at 1050°C – 1150°C followed by rapid cooling in air or water.
Weldability
Very good. Low heat input recommended.
Chemical composition
| Weight % | C | Mn | Cr | Ni | Mo | N | Cu | S | P |
| Min. | 19,00 | 23,00 | 4,00 | 1,00 | |||||
| Max. | 0,06 | 2,00 | 28,00 | 5,00 | 0,10 | 2,00 | 0,035 | 0,045 |
Approvals: ASTM A240, ASTM A276, ASTM A479, ASTM A480, EN 10088.
Mechanical properties
| Yield strength Rp0.2, MPa |
Tensile strength Rm, MPa |
Elongation [%] |
Hardness [HB] |
Impact, Charpy-V, -196ºC [J] |
|
| ASTM A240 | ≥ 230 | 520 – 720 | ≥ 35 | ≤ 90 | 60 |
Plate stock
| MEASUREMENTS | KG/PLATE |
|---|---|
| 1,5 x 1500 x 3000 mm | 54 |
| 2 x 1500 x 3000 mm | 72 |
| 2 x 1500 x 6000 mm | 144 |
| 2 x 2000 x 6000 mm | 192 |
| 3 x 2000 x 1000 mm | 48 |
| 3 x 2000 x 4000 mm | 192 |
| 3 x 2000 x 6000 mm | 288 |
| 4 x 2000 x 1000 mm | 64 |
| 4 x 2000 x 4000 mm | 256 |
| 4 x 2000 x 6000 mm | 384 |
| 5 x 2000 x 1000 mm | 80 |
| 5 x 2000 x 4000 mm | 320 |
| 5 x 2000 x 6000 mm | 480 |
| MEASUREMENTS | KG/PLATE |
|---|---|
| 6 x 2000 x 1000 mm | 96 |
| 6 x 2000 x 4000 mm | 384 |
| 6 x 2000 x 6000 mm | 576 |
| 8 x 2000 x 6000 mm | 791 |
| 10 x 2000 x 6000 mm | 960 |
| 12 x 2000 x 6000 mm | 1152 |
| 15 x 2000 x 6000 mm | 1440 |
| 20 x 2000 x 6000 mm | 1920 |
| 25 x 2000 x 6000 mm | 2400 |
| 40 x 2000 x 6000 mm | 3840 |
| 50 x 2000 x 6000 mm | 4800 |
Coil stock
| 1300 MM | 1500 MM | 2000 MM |
|---|---|---|
| 0,5 mm | 0,7 mm | 3 mm |
| 1,5 mm | 4 mm | |
| 2 mm | 5 mm | |
| 3 mm | 6 mm | |
| 4 mm | ||
| 5 mm | ||
| 6 mm |
Equivalent standards
- ALLOY 1.4539
- UNS N08904
- AISI 904L