butt-welded steel pipe cap material:cabon steel, alloy steel size:1/2"to48" wall thickness:Sch5s to Sch160 standard:GB, HGJ, SHJ, SY, DL, ISO, ANSI, JIS, and DIN.  we can also manufacture products according to clients demands and requirments You can find it pays for your attention and consideration of our products!