S31254 Stainless Steel

S31254 Stainless Steel is a kind  of alloy material with corrosion resistance, its density is 8.0g/cm3, melting  point is 1320~1390℃.

S31254 Physical Performance:
 Denstity:8.0g/cm3
 Melting  point:1320-1390℃
 Strength of  extension RmN/mm2: 650
 Yield strength  RP0.2N/mm2: 300
 Ductility A5%:  35

Product Description

S31254 Stainless Steel Characteristics:

High molybdenum  content and high chromium and nitrogen content enable UNSS31254 to have  excellent corrosion resistance and crevice corrosion resistance. The addition  of copper improves the corrosion resistance in certain acids. In addition, due  to its high nickel content and high chromium and molybdenum content, UNSS31254  has a good anti-stress corrosion cracking performance.
 1. A lot of  field experiments and extensive use experience has shown that even at a  slightly higher temperature, UNSS31254 in sea water also has the very high  resistance crevice corrosion performance, only a few kinds of stainless steel  with the performance.
 2. The corrosion  resistance of UNSS31254 in the acidic solution and oxidized halide solution,  such as paper bleach production, is comparable to that of nickel base alloys  and titanium alloys with the strongest corrosion resistance.
 3. Due to the  high nitrogen content of UNSS31254, the mechanical strength of UNSS31254 is  higher than that of other types of austenitic stainless steel. In addition,  UNSS31254 also has high ductility and impact strength and good weldability.
 4. The high  content of molybdenum in UNSS31254 can make it have a higher oxidation rate  during annealing, thus having a rougher surface than ordinary stainless steel  after pickling. But this has no adverse effect on the corrosion resistance of  the steel.

S31254 Stainless Steel Structure:

UNSS31254 is the  face-centred cubic lattice structure. In order to obtain the austenite  structure, 254SMO is generally annealed at 1150-1200 degrees Celsius. In some  cases, the center of the material may have traces of a metal intermediate  phase. But in general, they have no adverse effect on impact strength and  corrosion resistance. When placed in a range of 600 to 1000 degrees Celsius,  these phases may be precipitated on the grain boundary.

S31254 Stainless Steel Corrosion resistance：

The carbon  content of UNSS31254 is very low, which means that the risk of carbide  precipitation due to heating is very small. The steel is still able to pass  through the straus intergranular corrosion test even after an hour of sensitive  treatment at 600-1000℃. However, due to the high alloy content of the steel. In the above  temperature range the metal intermediate phase may be precipitated on the grain  boundary. These precipitates do not make the steel dangerous for intergranular  corrosion in corrosive media. Therefore, welding can be done without  intergranular corrosion.

But in hot  concentrated nitric acid, these precipitates may cause intergranular corrosion  in the hot zone. The common type stainless steel in a solution containing such  as chloride, bromide, or iodide is immediately corroded by a point of  corrosion, crevice corrosion or stress corrosion cracking in the form of  localized corrosion. However, in some cases, the presence of halides  accelerates uniform corrosion.

 This is especially true in cases where there  is a halide presence in an oxygen-free acid. In pure sulphuric acid, 254SMO is  much more resistant to corrosion than 316 common stainless steel. However, the  corrosion resistance of UNSS31254 was slightly weaker than that of 904L  (NO8904) type stainless steel at high concentration. In sulfuric acid  containing chloride ion, UNSS31254 has the largest corrosion resistance.
 

Due to local  corrosion and uniform corrosion, 316 ordinary stainless steel can not be used  in hydrochloric acid, but 254SMO can be used in dilute hydrochloric acid at  normal temperature. There is no need to worry about corrosion in the following  areas of the boundary. But we must try to avoid gaps. In fluorosilicic acid  (H2SiF4) and hydrofluoric acid (HF), the corrosion resistance of ordinary  stainless steel is very limited, while UNSS31254 can be applied in a wide range  of concentration and temperature.

Product Application

S31254 Stainless Steel Application：

1. Oil and  petrochemical equipment, such as corrugated pipe in petrochemical equipment.
 2. Pulp and  paper bleaching equipment, such as pulp digester, bleaching equipment, cylinder  and press roller for filter washing equipment.
 3. The plant  flue gas desulfurization device mainly USES the tower body of the absorber, the  flue, the door panel, the inner part, the sprinkler system and so on.
 4. Marine  systems or sea water treatment, such as thin wall condensing pipes with  seawater cooled in power plants, seawater desalination processing equipment,  even in equipment where seawater may not flow.
 5. Desalination  industry, such as salt or desalination equipment.6. Heat exchangers, especially  in the working environment of chloride ion.

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