What is 254 SMO and its Features

 

What is 254 SMO and its Features

Stainless steel grade 254 SMO™ is a very high end austenitic stainless steel. It is designed with a combination of impact toughness resistance to chloride stress corrosion cracking, and pitting and crevice corrosion with strength that is twice that of the stainless steel 300 series.

For certain applications, grade 254 SMO™ has been reported to be a cost-effective substitute for high nickel and titanium alloys. It is known to possess excellent workability as well.

Fabrication and Heat Treatment

Machinability

Stainless steel grade 254 SMO™ is quite tough to machine due to the extremely high work hardening rate and lack of sulfur content; however using sharp tools, overpowered machine tools, positive feeds, good amount of lubrication, and slow speeds tend to provide good machining results.

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 post-process 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.

Applications

Stainless steel grade 254 SMO™ is used in the following areas:

- Saltwater handling

- Tall oil distillation columns

- Flue gas desulfurization scrubbers

- Components used in petroleum production

- Food processing equipment

- Process equipment in chemical industry

- Bleaching equipment in the pulp and paper industry

- Flue-gas cleaning

- Desalination

- Heat exchangers

What is SMO piping?

SMO 254 Round Pipes (UNS S31254) is an austenitic stainless steel designed for maximum resistance to pitting and crevice corrosion. SMO 254 Welded Pipes is a very high end, molybdenum and nitrogen alloyed super austenitic stainless steel with low carbon content.

What is AL6XN material?

AL6XN is a superaustenitic stainless steel with outstanding resistance to chloride pitting, crevice corrosion and stress corrosion cracking. AL6XN is primarily used for its improved pitting and crevice corrosion resistance in chlorides. It is a formable and weldable stainless steel.

What is super austenitic stainless steel?

Superaustenitic stainless steels are defined as austenitic, iron-based alloys that have pitting resistance number (PREN) greater than 40.

What is grade 904L stainless steel?

Alloy 904L (UNS N08904) is a superaustenitic stainless steel that is designed for moderate to high corrosion resistance in a wide range of process environments. The combination of high chromium and nickel content, coupled with additions of molybdenum and copper, assure good to excellent corrosion resistance.

What is 6 moly stainless steel?

6% Moly Alloys are often found to have high levels of chromium and nitrogen which makes it even be able to withstand corrosion and stress cracking. They are part of the austenitic steel group which is one of the most widely used grade of stainless steel and is known for its good formability and resistance to corrosion.

What are the 4 types of stainless steel?

4 Types of Stainless Steel

- Austenitic. The austenitic group comprises the most common types of stainless steel.

- Ferritic. Containing anywhere between 10.5% and 30% chromium, ferritic stainless steels usually have low carbon consistencies of not more than 0.1%.

- Duplex.

- Martensitic.

Is 904L harder than 316L?

Type 904L contains more chromium, molybdenum and nickel then 316L, plus also some copper, manganese and silicon, which makes it more corrosion resistant than 316L. But the main issue with 904L, besides its extremely high price, is that it is still harder to process than 316L.

What grade of stainless steel does Rolex use?

904L

1. Rolex has been using 904L stainless steel since the 1980’s. Rolex first started using the 904L steel for the Rolex Sea-Dweller, their line of ultra-resistant professional diving watches. The rest of their steel watches still used the industry standard 316L.

What kind of stainless steel is SMO 254?

SMO 254 is austenitic stainless steel product that is designed for the maximum resistant to crevice corrosion and pitting.

What is the chemical composition of stainless steel grade 254?

The chemical composition of stainless steel grade 254 SMO™ is outlined in the following table. The physical properties of stainless steel grade 254 SMO™ are tabulated below. The following table shows mechanical properties of stainless steel grade 254 SMO™. The thermal properties of stainless steel grade 254 SMO™ are tabulated below.

What kind of steel is Sandvik 254 SMO made of?

Sandvik 254 SMO is a high alloyed austenitic stainless steel and thus tougher inserts in metal cutting are needed than is the case for lower alloyed austenitic grades. When machining Sandvik 254 SMO considerably lower cutting speeds are recommended compared to the grades Sanmac 304/304L and Sanmac 316/316L, which have improved machinability.

Which is stronger alloy 254 or 300 stainless steel?

It demonstrates outstanding resistance to pitting, crevice corrosion stress cracking, and corrosion fatigue uniform corrosion. Alloy 254 SMO is substantially stronger than the common austenitic grades, with strength nearly twice that of 300 series stainless steel. It is also characterized by high ductility and impact strength.