Shuruudaha Qalabka
Maaddada birta diskiga ah waxay qaadataa daloolka cawska ee doogga birta 250, oo loo yaqaan 'HT250', oo u dhiganta HT2000, oo u dhiganta heerka American G3000. Shuruudaha saddexda qaybood ee ugu waaweyn ee ka kooban kiimikada waa: c: 3.1∽3.4 si: 1.9∽2.3 mn: 0.6∽0.9. Shuruudaha waxqabadka farsamada: Awooda TSenlisle> = 206mpa, xoogga foosha> = 1000mpa, scllions, prollions, = 5.1mm, shuruudaha adag ee u dhexeeya: 187∽241hbs.