SMO 254 bars, also known as SMO 254 Round Bars, were primarily created for usage in hostile chloride carrying environments, such as saltwater. It has a chromium content between 19.5 and 20.5 percent, a molybdenum content between 6 and 6.5 percent, and a nitrogen content between.18 and.22 percent. It is described as being high stainless steel and austenitic. These various alloy element combinations enable 31254 to combine impact resistance, corrosion resistance, and pitting and crevice resistance.
Due to the molybdenum content, SMO 254 bars are sometimes referred to as 6 percent moly grade since they can easily withstand high temperatures and maintain strength even when exposed to volatile conditions. This grade exceeded the original aim and overlapped in several areas, proving to be quite helpful. This alloy is utilised in applications like flue gas desulfurization and chemical atmosphere because it contains a lot of molybdenum and other alloying elements. Additionally, it is discovered to be used at valves, pumps, pipes, and heat exchangers.
SMO 254 Bars’ resistance to corrosion
The presence of molybdenum, nitrogen, and chromium allows for a good resistance to pitting and crevice corrosion. Due to its low carbon content, there is little chance that carbide may precipitate when heated. It is providing good resistance to chloride-containing water, making it perfect to wear inside a sweater and allowing for extended use without experiencing crevice corrosion.
Weldability
It can be done without experiencing pre-heating and has good weldability. There is no need for additional heat treatment if done correctly. Because of its poor heat conductivity and higher thermal expansions, it must lessen distortion of the welding junction. But welding without filler metal produces poor strength characteristics.
Machinability
When paired with Sulphur, the high work hardening rate makes it slightly more difficult for the machine. A better result is provided by sharp tools, powerful machining equipment, slow speeds, etc.
Guidelines for SMO 254 Bars
Uses of SMO 254 Bars: ASTM/ASME – UNS S31254, DIN 2.4660, and EURONORM – FeMi35Cr20Cu4Mo2
SMO 254 is employed in the atmosphere with high chloride because of the high level of nickel alloy and molybdenum alloy. Below is a list of a few applications that call for it:
• Sector of the food industry
• Industry of construction
• Fabrication sector
• Defense sector
• Oil and gas sector
• The paper and pulp sector
• Chemical sector
• General-purpose software
• A water delivery system
• Plumbing
• heating
