Paduan pipa baja mulus minangka jinis pipa baja sing mulus, lan kinerjae luwih dhuwur tinimbang pipa baja mulus biasa.Paduan pipa baja mulus ngemot unsur kayata silikon, mangan, kromium, nikel, molibdenum, tungsten, vanadium, titanium, niobium, zirkonium, kobalt, aluminium, tembaga, boron, bumi langka, lsp.