materail  
   304(0Cr18Ni9)  304L(00Cr19Ni10)   321(1Cr18Ni9Ti   310S(0Cr25Ni20)  316(0Cr18Ni12Mo2)    316L(00Cr17Ni14Mo2)
specification
   ourside diameter:6--762
   wall thickness: 0.5--50mm
   longestlength:18000
standard:   ASTM  A269,ASTM A213, ASTM A312