Hebei Canghai Nuclear Equipment Technology Co.Ltd. has more than 20 years of experience in the professional production of capss. Regarding the type of caps:Cap, end cap, pipe cap, seamless cap , butt welding cap, carbon steel cap(CS cap),mild steel cap(MS cap), alloy steel cap(AS cap), stainless steel cap(SS cap) so on.Standard:ANSI/ASTM/ASME B16 9/16.28,API5L, DIN2617, JIS B2311/2312/2313 etc.Material:Carbon steel: ASTM A234 GR WPB , ST37.2 . ST35.8...Alloy steel: A234 WP5/WP9/WP11WP22/WP91, A420 WPL6, A860 WHPY 42/52/60/65/70/80 Stainless stee: A403 WP304/TP304,WP304LTP304L,WP316/TP316.WP316LTP316L.WP321/TP321,WP310/TP310.