SMO 254 Products

The alloy 254SMO is also known by the names 6Mo Stainless Steel alloy ( 6Mo ) or 6 Molybdenum Stainless Steel alloy. There are a number of different names for 254 SMO. It consists of a high-molybdenum alloy designed specifically for use in aggressive chloride environments, as well as in saline water. It is an entirely unique high alloy austenitic stainless steel that was developed specifically for this purpose.

Alloy SMO 254 is a Super Austenitic Stainless Steel Alloy with a low Carbon content alloyed with Molybdenum and Nitrogen.

In its chemical composition, 254 SMO is composed of Nickel and Copper, which in combination, provides it with high impact toughness resistance. It will not crack under chloride stress corrosion cracking, along with pitting and crevice corrosion. Moreover, the alloys of this series are also stronger than those of the 300 series stainless steel alloys, particularly in environments containing halide ions, such as environments where chloride ions, bromide ions, and fluoride ions, are present. In cases such as pitting corrosion, crevice corrosion or stress corrosion cracking, conventional stainless steels may be easily attacked by local corrosion caused by ions, bromide ions, or fluoride solutions. Generally, halides cause general corrosion to accelerate in acidic environments.

6 Molybdenum SMO exhibits excellent impact strength at both room and cryogenic temperatures because of its austenitic microstructure.

It is highly ductile and impact-resistant as well (ck3mcun). Considering its high concentration of chromium, molybdenum, and nitrogen in its chemical composition, UNS S31254 SMO Stainless Steel is ideal for environments containing high chloride levels like seawater, pulp mills, beach plants, brackish water, etc. Stainless Steel UNS S31254 fulfills all European standards even at -196C. Higher nickel and molybdenum contents increase resistance to Stress Corrosion Cracking in austenitic steels.

Stainless Steel 254 SMO performs better in pure sulphuric acid environments than Stainless Steel 316, and in naturally aerated sulphuric acid environments with chloride ions, 254 SMO performs better than Stainless Steel 904L.

The Strauss test passes even after sensitizing for one hour at 600–1000 C, as it contains very low carbon content. 254 SMO has a very low chance of carbide precipitation during heating. This type of precipitation does not present any type of risk of intergranular corrosion as intermetallic phases are precipitated at given temperatures. 254 SMO should not be exposed for extended periods at these temperatures. The method can be used during welding and there is no risk of intergranular corrosion.

As part of the 254 SMO products, tubes are heat treated. If a further heat treatment process is required, solution annealing at 1150-1200°C (2100-2190°F) is recommended, followed by quenching in water. Thin-walled tubes should be quenched in air or water at a minimum temperature of 1130°C (2060°F).

This welding grade exhibits excellent welding properties. If it is performed correctly, no subsequent heat treatment is required. Fusion welding involves manual metal arc welding using covered electrodes, as well as gad shield arc welding with TIG and MIG electrodes.

Since 254 SMO alloys are designed to withstand severe corrosive environments, welding has to be done using thorough cleaning techniques to ensure optimal corrosion resistance.

During multipass welding, the interpass temperatures shouldn't exceed 100, and the welding heat input shouldn't exceed 1.5KJ per mm.

In India, Mehta Metals is the leading manufacturer of stainless steel 254 UNS S31254. This stainless steel grade is an austenitic stainless steel of the highest quality. It has a strength twice that of stainless steel 300 series stainless steels. There is no crevice corrosion or pitting with the alloy 254 SMO UNS S31254. It is also very workable due to its resistance to corrosion and pitting from chloride stress. In India, mehtametals.com is a major proponent of SMO 254 products due to the high demand for this product. Besides SMO 254 Sheet and Plate, SMO 254 Round Bars, SMO 254 Pipe Fittings, SMO 254 Forged Fittings, SMO 254 Flanges, SMO 254 Fasteners, SMO 254 Valves, and SMO 254 Gaskets, we also manufacture Cobalt Manufacturer and similar products.

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