... #--2500# 4: C/S ,S/S , Alloy Steel 5:Marking as Customer design. Carbon Steel Swivel Ring Flange Type Weld Neck,Slip-On ... Class 150#,300#,400#,600#,900#,1500#,2500# Specification Carbon Steel ASTM A105/A694 F42/46/52/60/A350 LF2 Stainless ... , 20000Psi, 25000Psi* Materials Includes:> Carbon Steel: ASME SA105N> Low Temperature Carbon Steel: ASME SA350 LF2> High Strength Steel: ASME SA694 F42/46/52/56 ...