What are the common materials of stainless steel seamless pipes?

Answer: Common materials include:
Austenitic: 304, 304L, 316, 316L (excellent corrosion resistance, most widely used).
Duplex steel: 2205, 2507 (high strength, resistant to chloride corrosion).
Ferritic/Martensitic: 430, 410 (lower cost, relatively weak corrosion resistance).