254SMO Stainless Steel

Stainless Steel 254 SMO is a high-alloy austenitic chromium-nickel-molybdenum stainless steel developed for use in seawater, pulp and paper industry, brackish water and other aggressive chloride-bearing media. The specific levels of Cr, Ni, Mo, and N in this “super austenitic” chemical makeup allow 31254 to combine impact toughness resistance to corrosion cracking, with pitting and crevice corrosion resistance. The result is strength of nearly twice that of 300 series stainless steels. • UNS S31254 is often referred to as a “6% Moly” grade due to the molybdenum content; the 6% Moly family has the ability to withstand high temperatures and maintain strength under volatile conditions.

This grade has surpassed its original intent and overlapped into many industries proving useful owing to its high level of molybdenum amount other elements, which allows 31254 to be used successfully in various applications such as flue gas desulfurization and chemical environments. In some applications it has even been found to be a more cost effective substitute for high nickel and titanium alloys.

Chemical composition of 254SMO(1.4547）

Mechanical Properties of 254SMO (1.4547）

Bending

The excellent formability of 254 SMO permits cold bending to very tight bending radii. Annealing is not normally necessary after cold bending.

Welding

Welding of stainless steel grade 254 SMO™ requires filler material without which it results in poor strength properties. Filler metals such as AWS A5.14 ERNiCrMo-3, and alloy 625 are recommended. Electrodes used in the process, have to match with AWS A5.11 ENiCrMo-12.

Annealing

Annealing of this material should be performed at 1149-1204°C (2100-2200°F), which should be followed by a water quench.

Hot Working

Forging, upsetting and other operations relating to this material can be performed at 982 - 1149°C (1800 - 2100°F). It is recommended that temperatures do not exceed this range as it would result in scaling and reduction in the workability of the material. To re-attain maximum corrosion resistant properties, it is advisable to perform postprocess annealing.

Cold Working

Cold working can be carried out using all the traditional methods; however, the process would be tough due to its high work hardening rate. The result will provide the material with increased strength and toughness.

Hardening

Stainless steel grade 254 SMO™ does not respond to heat treatment. Hardening is possible only through cold reduction.

Forging

This is a highly alloyed material and the recommended forging temperature range is 2370/1920ºF (1300/1050ºC), followed by a solution anneal at 2100ºF (1150ºC) minimum temperature.

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Application 
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.