Technical Comparison of Stainless Steel 310 Pipe and Stainless Steel 321 Pipe for High-Temperature Applications
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Industries that require high-temperature resistant materials for their equipment often use Stainless Steel 310 Pipe components from furnace, radiant tubes, heat exchangers, and petrochemical lines. It is an austenitic chromium-nickel alloy that is usually made to ASTM A312 and ASTM A213 standards and has a composition of about 25% chromium and 20% nickel. The alloy offers high oxidation resistance service temperature to 1100°C in intermittent operation. Pipes are produced either as welded or seamless with thicknesses from SCH 10 to SCH XXS. These pipes are typically available in diameters from ½ inch to 24 inches. Localities like Riyadh and Dammam where EPC contractors handpick these grades for refineries and thermal plants use B2B portals that connect verified buyers and suppliers with documented mill test certifications.
However, if the 310 grade is chosen mainly for its superior oxidation resistance, it will not be appropriate for those parts where there will be stabilization of microstructures after long heating which require other alloy types. In petrochemical regions such as Jubail, project engineers compare strength at elevated temperature, mechanical properties, and corrosion resistance of the materials prior to purchasing. Austenitic titanium stabilized grades after welding exhibit less susceptibility to intergranular corrosion, in particular, in pressure piping to ASME B31.3 code. Products at pipingmaterial.sa in general group items by grade, class, end type, and pressure rating so as to enable customers to easily pick from different compliance stocks of genuine distributors.
For temperatures ranging from 427°C up to 816°C where the risk of carbide precipitation is high, the use of Stainless Steel 321 Pipe has been the preference by majority of specifying authorities. The titanium-stabilized grade that fully complies with the ASTM A312 TP321 standard of the main reference specification is available not only as seamless but also as ERW and EFW types with dual certification. The major reliable suppliers of Saudi-made products will reveal chemical analysis as well as third-party inspection reports that guarantee the material integrity at the customer end in highly demanding process conditions.
However, if the 310 grade is chosen mainly for its superior oxidation resistance, it will not be appropriate for those parts where there will be stabilization of microstructures after long heating which require other alloy types. In petrochemical regions such as Jubail, project engineers compare strength at elevated temperature, mechanical properties, and corrosion resistance of the materials prior to purchasing. Austenitic titanium stabilized grades after welding exhibit less susceptibility to intergranular corrosion, in particular, in pressure piping to ASME B31.3 code. Products at pipingmaterial.sa in general group items by grade, class, end type, and pressure rating so as to enable customers to easily pick from different compliance stocks of genuine distributors.
For temperatures ranging from 427°C up to 816°C where the risk of carbide precipitation is high, the use of Stainless Steel 321 Pipe has been the preference by majority of specifying authorities. The titanium-stabilized grade that fully complies with the ASTM A312 TP321 standard of the main reference specification is available not only as seamless but also as ERW and EFW types with dual certification. The major reliable suppliers of Saudi-made products will reveal chemical analysis as well as third-party inspection reports that guarantee the material integrity at the customer end in highly demanding process conditions.
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