254SMo

254 SMo

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Product Description

254 SMo

254 SMo

High molybdenum content and high chromium and nitrogen content to make 254 SMO has very good resistance to pitting and crevice corrosion resistance properties. Copper is added to improve the corrosion resistance in certain acids. In addition, due to its high nickel content and high chromium and molybdenum content, makes 254 SMO has good resistance to stress corrosion cracking performance.

 

A large number of field experiments and extensive experience shows that even at a slightly higher temperature, 254 SMO in seawater also highly resistant to crevice corrosion resistance, only a few types of stainless steel with this performance.

 

254 SMO in an acidic solution and an oxidizing halide solutions such as bleaching paper needed for the production of corrosion resistance and corrosion resistance can be the strongest of nickel-based alloys and titanium alloys compared to the United States.

 

Since 254 SMO has a high nitrogen content, and therefore its mechanical strength than other types of austenitic stainless steel is higher. In addition, 254 SMO also has high impact strength and good ductility and weldability.

 

254 SMO high molybdenum content can make a higher oxidation rate during annealing, which after pickling has rougher than ordinary stainless steel surface. But it has no adverse effect on the corrosion resistance of steel.

Applications of 254 SMo:

  • Seawater handling systems
  • Desalination plant equipment
  • Paper and pulp
  • Flue gas desulphurisation units in power plants
  • Chemical processing
  • Control and instrumentation tubes

Industries predominantly using this grade

  • Chemical processes
  • Oil and gas

Typical Chemical Composition (% by weight)

Title UNS Werkstoff C Si Mn P S Cr Ni Mo Cu N
316L S31603 1.4404 0.03 1 2 0.045 0.015 17.5 11.5 2.25 - -
317L S31703 1.4439 0.03 1 2 0.045 0.3 19 13 3.5 - -
904L N08904 1.4539 0.02 1 2 0.045 0.035 21 25.5 - - -
6mo S31254 1.4547 <0.02 0.7 1 0.3 0.01 20 18 6.1 0.75 0.2
625 N06625 2.4856 0.1 0.5 0.5 0.015 0.5 21.5 58 8.5 - -
C276 N10276 2.4819 0.01 0.08 1 0.04 0.03 15.5 55 16 Co
2.5
W
3.75

Physical Properties (Room Temperature)

Specific Heat (0-100°C) 500 J.kg-1.°K-1
Thermal Conductivity 14 W.m -1.°K-1
Thermal Expansion 16.5 mm/m/°C
Modulus Elasticity 196 GPa
Electrical Resistivity 8.5 μohm/cm
Density 8.0 g/cm3

Mechanical Properties

Temper Annealed
Tensile Rm 98 ksi (min)
Tensile Rm 675 MPa (min)
R.p. 0.2% Yield 45 ksi (min)
R.p. 0.2% Yield 310 MPa (min)
Elongation
(2” or 4D gl)
35 % (min)