Forged Carbon Steel (A105) with SS internals 15 NB, 20 NB, 25 NB, 40 NB,50NB in socket weld, Butt Weld ends as well as Screwed BSPT NPT Ends For socket weld, Butt Welded ends, Max Operating Pressure : 78 kgcm2 Max Operating Temperature : 427 deg. C Cast Carbon Steel (ASTM A 216 WCB ) WITH SS INTERNALS 15NB to 200NB in ANSI Class-150 and Class-300 Max working Conditions: 40 kgcm2 at 400 deg C.