Data Sheet No. 4B:National Research Institute for Metals; 1986. DOI:10.11503/nims.1008  Sawada K, Kimura K, Abe F et al. Data Sheets on the Elevated-Temperature Properties of 18Cr
NIMS CREEPno.3b:data sheets on the elevated-temperature properties of 2.25cr-1mo steel for boiler and heat exchanger seamless tubes (stba 24) 1986:no.4b:data sheets on the elevated-temperature properties of 18cr-8ni stainless steel for boiler and heat exchanger seamless tubes (sus 304h tb) 1986:no.5b
May 12, 2008 · There is no "4B" finish recognized by ASTM and a colleague confirmed that there is no industry specific 4B. The relevant ASTM standard for stainless steel sheet and strip finishes is ASTM A480 [affil. link to spec at Techstreet]. Another potential source of confusion is that the Europeans and Japanese have two No. 4 finishes.