Ar an gcéad dul síos, tá caidreamh iontach ag neart teanntachta an amhábhar bolt lena phróiseas múchta. Go ginearálta, tá sé deacair na riachtanais amhábhar de 10.9-boltaí ard-láidre a chomhlíonadh tar éis 40-múchadh céime. Mura ndéantar iniúchadh dian air, is féidir é a bheith bunaithe ar an táirge tar éis múchadh. Úsáidtear cruas dromchla chun an neart teanntachta a mheas. Chomh maith leis na hairíonna éagsúla sa phróiseas próiseála, tá airíonna moille agus briste éagsúla faoi bhrú ard ag boltaí ard-neart le hamhábhair éagsúla.
Secondly, high-strength bolts made of 40Cr quenching treatment are mainly used in bolt ball joint grids. The design strength is generally 390MPa (d>=30mm) nó 430MPa (d<30mm). There is no high pre-conditioning during use. Tensile pressure, if a high pre-tension force is to be added, attention should be paid to understanding and ensuring its delayed fracture performance. In order to produce qualified high-strength bolt products, it is best to strictly follow the requirements.
