- EN / Grade
- 1.4539
- Other designations / UNS
- 904L / X1NiCrMoCu25-20-5
UNS N08904 - Family
- Austenitic
Start selection with the medium
904L offers a different option from standard austenitic grades in some acidic and chloride-bearing processes. Concentration, temperature and other constituents matter alongside the acid name. Higher alloy content does not mean resistance to every chemical, so provide process data at the enquiry stage.
Fabrication and surface cleanliness
Work hardening, tool life and post-weld surface condition influence fabrication of high-alloy austenitic material. Correct grade selection does not remove the effects of iron contamination, deposits or unsuitable weld cleaning. Define the machining section and final surface requirement together.
Do not classify by the UNS letter alone
Although designated UNS N08904, 904L is considered an austenitic stainless steel. Use the 904L name with 1.4539 or the complete designation in the specified standard. Plate, pipe and bar acceptance requirements and delivery conditions are then defined separately.
Typical application areas
Chemical plants, process tanks and equipment components for acid service.
Product and cutting options
Share the section and dimensions you require for this grade. Availability is assessed for each request; the catalogue does not represent live stock.
What to specify in your enquiry
- Grade designation and applicable material standard
- Section, finished dimensions and machining allowance
- Quantity, delivery condition and certificate requirements
Frequently asked questions
Can I request 1.4539 in cut lengths?+
Share your required section, dimensions and quantity. Our team will assess suitable supply and cutting options for the specific grade.
Are the listed grade designations interchangeable?+
Designation systems can overlap, but they do not make every specification identical. Use the exact standard and certificate requirements defined by your project.