Tam sim no peb cov khoom siv feem ntau siv cov qauv yog:
ISO (International)
GB (Tuam Tshoj)
DIN (Lub teb chaws Yelemees)
AISI/SAE (USA)
JIS (Nyiv)
Cov khoom siv rau bolts thiab lwm cov xov sab nraud:
Qee qhov qis carbon steel fasteners uas tsis muaj cov cuab yeej siv tshuab lossis ISO Class 4.8 SAE Qib 1-2 txaus nrog Q235A SAE 1015 DIN C15, tsis muaj kev kho cua sov, ua haujlwm txias, thiab qib siab dua me ntsis xws li xws li: ISO Class 6.8 SAE Qib 3-4 yog siv cov pa roj carbon ntau dua 0.2 feem pua ntawm cov hlau, xws li C1020 C1022 Ml20 ML35, xws li screws tsis xav tau kev kho cua sov, kev ua haujlwm txias tuaj yeem ua tau raws li qhov xav tau. Qhov tseeb, qhov siab dua cov ntsiab lus ntawm cov pa roj carbon monoxide, qhov txias txias dua, tsis tas yuav tsum muaj 6.8 qib ntsia hlau loj, qhov xwm txheej tshwj xeeb yog lwm qhov teeb meem.
Peb feem ntau siv cov ntsia hlau yog ISO Class 8.8 SAE Qib 5, feem ntau siv cov pa roj carbon nruab nrab, ML35 SAE 1035 DIN 35 JIS SWRCH35K tom qab kev kho cua sov (quenching plus tempering), kuj tuaj yeem siv SAE 5140 40Cr, thiab lwm yam. ntawm cov ntsiab lus alloying ntawm hardenability ntawm kev kho cua sov muaj kev pab zoo, yog li cov lus qhia loj ntawm cov ntsia hlau tuaj yeem xaiv siv cov hlau alloy, tsis txhob siv cov pa roj carbon steel ua rau lub hauv paus ntawm qhov peb feem ntau hais yog qhov tshwm sim ntawm "quench los ntawm" phenomenon. .
ISO Class 9. Cov ntaub ntawv rau 40Cr 35CrMo SAE5140 SCM435 SAE4135 SAE4137 JIS SCr440(H) DIN 41Cr4 thiab lwm yam, qhov tseeb, 45 # kuj tuaj yeem ua tiav cov khoom siv kho tshuab uas xav tau, tab sis nyob rau hauv cov khoom siv txhua yam ntau dua li cov hlau tsis zoo me ntsis.
ISO Class12.9 SATM A574 yog lub zog muaj zog bolt nrog cov khoom siv kho tshuab siab, uas yog kho cua sov (quenched ntxiv rau tempered) nrog cov pa roj carbon hlau nruab nrab, xws li SCM435 35CrMo SAE 4137 SAE4135 DIN 34CrMo4, Yog hais tias qhov chaw Kev kho mob ntawm hom no lub zog siab bolt yog mus los ntawm cov txheej txheem ntawm pickling, hydrogen embrittleness yuav tshwm sim, yog li nws yuav tsum muaj cov txheej txheem ntawm hydrogen tshem tawm (tshwj xeeb tshaj yog rau fasteners nrog ntse fab).
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