ASTM A312 S31254 Duplex Stainless Steel Pipes For Heat Exchanger
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ASTM A312 S31254 Stainless Steel Seamless Pipe , offshore and platform application
254 SMO is a high-alloy austenitic stainless steel developed for use in seawater and other aggressive chloride-bearing media. The steel is characterized by the following properties:
The PRE is defined as, in weight of content %, PRE = Cr % + 3.3 x Mo % + 16 x N %
Standards
254 SMO Applications:
Intergranular corrosion254 SMO has a very low carbon content. This means that there is very little risk of carbide precipitation during heating, for example when welding. The steel passes the Strauss test (ASTM A262, practice E) even after sensitizing for one hour at 600–1000°C (1110–1830°F). However, due to the high alloying content of the steel, inter-metallic phases can precipitate at the grain boundaries in the temperature range 600–1000°C (1110–1830°F). These precipitations do not involve any risk of intergranular corrosion in the environments in which the steel is intended to be used. Thus, welding can be carried out without any risk of intergranular corrosion. Pitting corrosionThe pitting and crevice corrosion resistance of stainless steel is primarily determined by the content of chromium, molybdenum and nitrogen. Manufacture and fabrication, e.g. welding, are also of vital importance for the actual performance in service. A parameter for comparing the resistance to pitting in chloride environments is the PRE number (Pitting Resistance Equivalent). The PRE is defined as, in weight-%, PRE = %Cr + 3.3 x %Mo + 16 x %N Heat Treatment Mechanical Properties
a) Rp0.2 and Rp1.0 correspond to 0.2% offset and 1.0% offset yield strength,
respectively.
Weldding: Recommended filler metalsTIG/GTAW or MIG/GMAW welding |
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Product Tags: ASTM A312 S31254 Stainless Steel Pipes Heat Exchanger Duplex Stainless Steel Pipes Eddy Current Test Stainless Steel Pipes |
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