I-ASTM A193 IBakala B7 le nkcazo yempahla yemigangatho ye-Chromium-molybdenum ye-Alobdenum yamandla aphezulu, amaqondo aphezulu, kunye nezicelo ezizodwa. Ibanga B7 yi-RolybDum ye-chromium ye-chromium ye-chromium ye-chromium ene-100 imfuneko yobuncinci be-100 ksi, amandla esivuyiweyo nge-75 hrc. The ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat treatment, and recommended nut washers for Class B7 fasteners. I-ASTM A193 IBakala B7 le ngcaciso lubanzi lokuthatyathwa kwezinto, ifumaneka kwiibhotile okanye imibhobho, iinqanawa zoxinzelelo, iivalves, ezifungelweyo kunye nezixhobo.