ASME SA182 F316Ti Stainless Steel Nozzle Flange B16.5
ASME SA182 specifies the chemical composition, mechanical properties, heat treatment, manufacturing, and testing requirements for wrought austenitic stainless steel, alloy steel, and stainless steel flanges, fittings, valves, and their components for high-temperature and high-pressure service. F316Ti, a specific austenitic stainless steel grade specified in the SA182 standard, is a modified form of 316 stainless steel and is also known as titanium-stabilized austenitic stainless steel. Nozzles typically extend from the vessel wall or main pipeline and are used to connect instruments, branch pipes, safety valves, manholes, inspection holes, etc., while nozzle flanges are flanges installed at the end of a vessel or equipment connection.
ASME SA182 F316Ti Stainless Steel Flange Chemical Composition
| GRA. | CHEMICAL COMPOSITION % MAXIMUM |
| C | MN | P | S | SI | CR | NI | MO | Ti | N |
| F316Ti | 0.08 | 2.00 | 0.03 | 0.03 | 1.0 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 5x(C+N)-0.7 | 0.1 |
ASME SA182 F316Ti, thanks to its high Cr and Mo contents and the stabilizing effect of Ti, offers excellent resistance to intergranular corrosion. It is also highly resistant to acidic and alkaline solutions, pitting and crevice corrosion in chloride environments, atmospheric corrosion, and aqueous corrosion. Its austenitic structure maintains excellent strength and oxidation resistance at high temperatures. The addition of Ti also helps F316Ti maintain high-temperature strength and good low-temperature toughness at low temperatures, preventing brittleness. While more difficult to machine than carbon steel, F316Ti remains one of the most machinable stainless steels.
ASME SA182 F316Ti Stainless Steel Flange Heat Treatment
| GRA. | UNS GRA. | Tensile Strength, min, ksi [MPa] | Yield Strength, min, ksi [MPa]B | Elongation in 2 in. [50 mm] or 4D, min, % |
| F316Ti | S31635 | 75[515] | 30[205] | 30 |
ASME SA182 F316Ti Stainless Steel Nozzle Flange Main Application Areas
ASME SA182 F316Ti stainless steel nozzle flanges are widely used in applications requiring stringent corrosion resistance or high-temperature performance, particularly in environments where there is a risk of post-weld or high-temperature sensitization.
- Chemical Process Industry: Flanges for reactors, towers, heat exchangers, and storage tanks exposed to various corrosive media, such as acids, alkalis, and saline solutions.
- Oil and Gas Industry: Equipment in upstream oil and gas production and processing facilities, and downstream refineries and petrochemical plants, particularly in environments containing sulfur (H2S), chlorides, or other corrosive components.
- Energy Industry: Boiler feedwater and steam systems in thermal power plants, and auxiliary systems in nuclear power plants.
- Pharmaceutical and Food Industry: Piping and equipment connections requiring high cleanliness and corrosion resistance.
- Pulp and Paper Industry: Equipment used to handle corrosive chemicals.
- Marine Engineering: Seawater cooling systems and offshore platform equipment.
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