Alloy 254 SMO is a very high-end molybdenum and nitrogen alloyed super austenitic stainless steel with low carbon content. It shows excellent resistance to pitting, crevice corrosion stress cracking and Corrosion fatigue uniform corrosion. Alloy 254 SMO is much stronger than common austenitic grades and has almost twice the strength of 300 series stainless steel. It also has the characteristics of high ductility and impact strength. Due to the high content of chromium, molybdenum, and nitrogen, alloy 254 SMO is often used in high chloride environments, such as salt water, seawater, pulp mill bleaching plants, and other chloride process streams. In some applications, it has even been found to be a more cost-effective alternative to high nickel and titanium alloys.
Application:
Due to its high content of molybdenum and nickel, alloy 254 SMO is often used in high chloride environments. Examples of applications that require the use of alloy 254 SMO include:
- Oil production
- Salt water treatment
- Food and chemical processing equipment
- Pulp Mill Bleaching System
- Flue gas desulfurization washing tower
- Tall oil distillation tower
- Offshore oil and gas production equipment
- Seawater desalination equipment
Standard:
ASTM/ASME：UNS S31254
EURONORM：FeMi35Cr20Cu4Mo2
DIN : 2.4660
Resistance
Corrosion resistance
Due to its high chromium, molybdenum, and nitrogen content, it has excellent resistance to pitting and crevice corrosion
The carbon content is extremely low, which means that the risk of carbide precipitation during the heating process is very low
It has excellent resistance in water containing chlorides, so it is suitable for use in seawater because it can be exposed to seawater for a long time without being subjected to crevice corrosion
machining
Solderability
Has good weldability
Should be completed without preheating
If executed correctly, no subsequent heat treatment will be required
Due to its low thermal conductivity and high thermal expansion, it is necessary to minimize the deformation of welded joints as much as possible
Welding without filler metal can lead to poor strength performance
Processability
High work hardening rate and lack of sulfur make it difficult to work
Low speed, sharp cutting tools, forward feed, machine tools with excessive power, and sufficient lubrication can provide the best results
