Materials :Stainless Steel Weldolet - SS Weldolet, ASTM A403 WPW Gr. 304, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904l. Carbon Steel Weldolet - CS Weldolet, ASTM A 234 WPW , WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 . Low Temperature Carbon Steel Weldolet - LTCS Weldolet& WPHY 70.ASTM A420 WPL3 A420WPL6.