We are offering butt-weld pipe fittings:stainless steel: astm a403 wp 304 304l 304h 316 316l 317 317l 321 310 347 904l etc.Carbon steel: astm a234 wpb a420 wpl3 a420 wpl6 mss-sp-75 wphy 42465256606570 etc.Alloy steel : astm a234 wp1 wp5 wp9 wp11 wp22 wp91 etc. Size: 18" nb to 48" nb. (seamless & welded) wall thickness: sch. 5s to sch. Xxs.