L-ewwelnett, is-saħħa tat-tensjoni tal-materja prima tal-bolt għandha relazzjoni kbira mal-proċess tat-tifi tagħha. Ġeneralment, huwa diffiċli li tissodisfa r-rekwiżiti tal-materja prima ta '10.9-boltijiet ta' saħħa għolja ta 'livell wara 40-grad ta' tkessiħ. Jekk ma jiġix spezzjonat b'mod strett, jista 'jkun ibbażat fuq il-prodott wara t-tifi. L-ebusija tal-wiċċ tintuża biex tiġġudika s-saħħa tat-tensjoni. Minbarra l-proprjetajiet differenti fil-proċess tal-ipproċessar, boltijiet ta 'saħħa għolja b'materja prima differenti għandhom ukoll proprjetajiet differenti ta' dewmien u ksur taħt pressjoni għolja.
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) jew 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.
