254SMo is an austenitic stainless steel, developed for use in halide-containing environments such as
seawater. The superiority of this steel manifests itself especially
in halide-containing acids. 254SMo also features good resistance to
uniform corrosion. As its carbon content is less than 0.02%, it is
called pure austenitic stainless steel; when its carbon content is
less than 0.01% , it can also be called super austenitic stainless steel.
Features of Inox 254SMo
Super stainless steel is a type of special stainless steel. First
of all, unlike ordinary stainless steel, it is a high-alloy
stainless steel containing high nickel, high chromium and high
molybdenum. The most well-known one is 254SMo with 6% Mo. Due to
high molybdenum content, this stainless steel features very good local corrosion resistance. Plus, it features
good resistance to pitting corrosion (PI ≥ 40) and stress corrosion
when used in harsh conditions like seawater, aeration, gap and low
speed scouring. Therefore, it can be a great substitute to
nickel-based alloys and titanium alloys. Secondly, it embodies
excellent high-temperature resistance and corrosion resistance,
which 304 stainless steel cannot match. In addition, from the classification of stainless
steel, the metallographic structure of special stainless steel is a
stable austenitic metallurgical structure.
According to the results of a large number of field experiments and
extensive experience, 254SMo has high crevice corrosion resistance
in seawater, even at slightly higher temperatures. Only a few types
of stainless steel embody this property. In acidic solutions and
oxidizing halide solutions necessary for paper bleaching, 254SMo
demonstrates strong corrosion resistance, comparable to that of the
most corrosion-resistant nickel-based alloys and titanium alloys.
Due to the high nitrogen content, 254SMo features better mechanical
strength than other types of austenitic stainless steel. In
addition, 254SMO features high ductility, impact strength and good
weldability. The high molybdenum content contained within allows
254SMO to acquire a high oxidation rate during annealing, resulting
in a rougher surface than common stainless steel after pickling.
However, this does no harm to the corrosion resistance of this
|254 SMO||S31254||1.4529||X1CrNiMoCuN20-18-7||2378*||Z1 CNDU 20.18.06AZ*|
The chemical composition of stainless steel grade 254 SMO™ is
outlined in the following table.
The following table shows mechanical properties of stainless steel
grade 254 SMOTM.
|Tensile strength||680 MPa||98600 psi|
|Yield strength||300 MPa||43500 psi|
|Modulus of elasticity||195 GPa||28300 ksi|
|Shear modulus||75 GPa||10900 ksi|
|Elongation at break||50 %||50 %|
- 254SMo Applications
- 1) Ocean: marine structures in the sea environment, seawater desalination,
marine aquaculture, seawater heat exchange, etc.;
- 2) Environmental Protection: flue gas desulfurization device for thermal power generation,
wastewater treatment, etc.;
- 3) Energy: atomic power generation, comprehensive utilization of coal, and
ocean wave power generation.;
- 4) Petrochemical Industry: refining, chemical equipment;
- 5) Food: salt making, soy sauce brewing, etc.;
- 6) High concentration chloride ion environment: paper industry, various bleaching devices;
- 7) Others.
Grade 254SMo, Type 254SMo, Inox 254SMo, AISI 254SMo, SUS 254SMo,
1.4547, UNS S31254, Acero 254SMo.