ASTM A312 304 201 316 309 310 321 409 439 2205 2507 904L Seamless Pipe Sch40 Sch60 Sch80

The ASTM A312 specification covers seamless and welded austenitic stainless steel pipes for high-temperature and general corrosive service. Here’s a brief overview of the various materials and schedules you mentioned:

Stainless Steel Grades
304: Commonly used for its excellent corrosion resistance and formability. Ideal for many applications, including food and beverage processing.
201: A lower-cost alternative to 304, with good oxidation resistance but lower corrosion resistance.
316: Offers superior corrosion resistance, particularly against chlorides, making it suitable for marine environments.
309: Known for high-temperature strength and oxidation resistance; often used in furnace applications.
310: Similar to 309 but with a higher chromium and nickel content, making it suitable for extreme temperatures.
321: Stabilized with titanium, offering good resistance to intergranular corrosion and high temperatures.
409: Ferritic stainless steel, good for automotive applications, particularly exhaust systems.
439: Offers good corrosion resistance and formability; often used in automotive and industrial applications.
2205: A duplex stainless steel that combines the advantages of austenitic and ferritic steels, offering high strength and corrosion resistance.
2507: A super duplex stainless steel with excellent resistance to pitting and crevice corrosion; suitable for harsh environments.
904L: A high alloy austenitic stainless steel with low carbon content, highly resistant to corrosion in sulfuric acid environments.
Pipe Schedules
Sch 40: Standard wall thickness; suitable for many applications.
Sch 60: Thicker wall than Sch 40; used for higher pressure applications.
Sch 80: Even thicker wall, providing additional strength and pressure capacity.
Sch 100: Offers more strength, ideal for high-pressure systems.
Sch 120: Thickest wall in this list, used in extreme pressure applications.
Applications
These stainless steel pipes are widely used in various industries, including:

Oil and Gas: For transporting fluids and gases.
Chemical Processing: In environments where high corrosion resistance is needed.
Food and Beverage: For hygienic applications.
Marine: Where resistance to saltwater corrosion is crucial.
Power Generation: In high-temperature and high-pressure systems.

Application field: