Koj Paub Ntau npaum li cas txog Bolt Performance Grade

Qib kev ua tau zoo ntawmboltsyog tus qauv siv los txheeb xyuas cov khoom siv ntawm cov khoom siv bolt. Nws feem ntau muaj ob ntu, xws li 8.8, 10.9, 12.9, thiab lwm yam. Thawj tus lej sawv cev rau lub zog tensile, thiab tus lej thib ob sawv cev rau lub zog yield.

Cov hauv qab no yog cov ntsiab lus ntawm qee qhov kev ua tau zoo ntawm bolt:
Qib 4.6: Lub zog tensile yog 400N / mm ² thiab lub zog tawm los yog 240N / mm ². Qhov no yog ib qho ntsia liaj qhov rooj uas feem ntau siv nyob rau hauv qhov chaw qis thiab qhov kub thiab txias.
Qib 8.8: Lub zog tensile yog 800N / mm ² thiab lub zog tawm los yog 640N / mm ². Qhov no yog qhov nruab nrab lub zog ntsia liaj qhov rooj dav siv rau ntau yam kev sib txuas ntawm cov tshuab thiab cov qauv.
3. Qib 10.9: Lub zog tensile yog 1000N / mm ² thiab lub zog tawm los yog 900N / mm ². Qhov no yog ibsiab zog boltfeem ntau siv rau hauv cov khoom siv tshuab tseem ceeb thiab cov qauv loj.
4. Qib 12.9: Lub zog tensile yog 1200N / mm ² thiab lub zog tawm los yog 1080N / mm ². Qhov no yog lub siab tshaj plaws qib bolt, feem ntau yog siv nyob rau hauv tshwj xeeb high-pressure thiab high-temperature ib puag ncig.
Nws yuav tsum tau muab sau tseg tias thaum xaiv cov qib kev ua tau zoo ntawmbolts, tsis tsuas yog yuav tsum xav txog lawv lub zog tensile thiab lub zog tawm los, tab sis kuj yog lawv lub zog, qaug zog, kev tiv thaiv corrosion, thiab lwm yam khoom. Ntxiv mus, qhov chaw sib txawv thiab cov ntawv thov yuav xav tau ntau qib kev ua tau zoo, yog li thaum xaiv, nws yog qhov yuav tsum tau xav txog tag nrho cov kev siv tiag tiag.