We are engaged in offering the most sought after range of Stainless Steel 904L. These are offered in diverse specifications such as 1. 4539 – x1nicrmocu25-20-5 acc. Din en 10088, vdtuv-wbl. 421 and sew 400, Equivalent to aisi 904l, uranus b 6, cronifer 1925 lc, uns n08904, Resistant to media containing phosphor, sulphur and chlorides. To be used in: sulphuric acid and phosphor plants, desulphurization, plants, fertilizer plants, pulp industry, chemical industry and pharmaceutical industry, linepipe constructions. Note
The low carbon content guarantees intergranular corrosion resistance of the welded condition. The high content of chromium and molybdenum ensures very good resistance to chlorides and stress corrosion cracking is prevented by nickel content from 24. 0 % up to 26. 0 % in conjunction with the addition of copper. Availability, a comprehensive range of products and quick service are the prerequisites of our well-kept stock in grade 1. 4539/904l. During the last years we could gather a lot of experience in forming, welding and surface technology of this specific material grade. Depending on the requirements, we are able to provide special surface conditions and to guarantee tight tolerances with regard to the outside and inside diameter. Give us a challenge.
We are looking Enquiries from Gulf, Brazil , Russia and African countries.
Fe, <0.02% C, 19-23% Cr, 23-28% Ni, 4-5% Mo, <2.0% Mn, <1.0% Si, <0.045% P, <0.035% S, 1.0-2.0% CuBackground
904L is a non-stabilised low carbon high alloy austenitic stainless steel. The addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulphuric acid. It is also highly resistant to chloride attack - both pitting / crevice corrosion and stress corrosion cracking.
This grade is non-magnetic in all conditions and has excellent weldability and formability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures.
904L does have very substantial contents of the high cost ingredients nickel and molybdenum. Many of the applications in which this grade has previously performed well can now be fulfilled at lower cost by duplex stainless steel 2205 (S31803 or S32205), so it is used less commonly than in the past.Key Properties
These properties are specified for flat rolled product (plate, sheet and coil) in ASTM B625. Similar but not necessarily identical properties are specified for other products such as pipe, tube and bar in their respective specifications.Composition
Table 1. Composition ranges for 904L grade of stainless steels.
Table 2. Mechanical properties of 904L grade stainless steels.
Tensile Strength (MPa) min
Yield Strength 0.2% Proof (MPa) min
Elongation (% in 50mm) min
Rockwell B (HR B)
Rockwell Hardness value range is typical only; other values are specified limits.