1. Lub ntsiab ua rau kev tawm tsam hauv spa-h steel
(1) cov pa roj carbon muaj sib npaug (CE) & Hardenability
Spa-h muajcov pa roj carbon (tsawg dua los yog sib npaug rau 0.12%)tab sis muajCU, CR, thiab P, Ua kom muaj zog ntxiv.
Sai sai txias (dej / roj quenching) tsimtus ntaus tswv, coj mus rau kev ntxhov siab sab hauv.
(2) Cov Tsis Muaj Zog Cua Txias & Kev ntxhov siab thermal
Cov nqi tsis ncaj (piv txwv, tuab vs. nyias seem) uathermal gradients, ua rau kev tawg.
(3) pre-expections
Suav nrog, microcracks, lossis cais cov lus qhia (piv txwv li, siab p ntsiab lus) ua raws li cov ntsiab lus pib tawg.
(4) tsis raug txiav txim siab
Overheating (>950 degree) ua raucoarse nplej qauv, nce brittleness.
(5) Tsis muaj kev npau taws tom qab quenching
Untempered martensite yogTsis tshua muaj nkigthiab nquag mus tawg ua kom muaj kev ntxhov siab.
2. Kev tiv thaiv kev tiv thaiv kom tsis txhob muaj qhov tawg
(1) Zam kev zam tsis tsim nyog
Spa-h yogtsis tsim rau quenching; kev sivLi qub (yog xav tau)Hloov chaw (~ 900 degree, cua txias).
(2) tswj tau txias tus nqi
Yog tias yuav tsum tau quenching, sivpolymer lossis roj quenchinghloov dej los txo thermal poob siab.
(3) preheating ua ntej quenching (yog muaj)
Kub rau400-600 degreeUa ntej zaum kawg quenching los txo cov kev ntxhov siab thermal no.
(4) post-quengen tempering (tseem ceeb!)
Tam sim ntawd kub heev550-650 degreeTxhawm rau hloov brittle martensite rau hauv kev nruj duaTempered Martensite / Ferrite-Pumpite.
(5) Cov Khoom Siv Khoom Zoo Tswj
Ua kom tau tiag tiagTsawg sulfur (s tsawg dua los yog sib npaug rau 0.030%) thiab phosphorus (p tsawg dua lossis sib npaug nrog 0.15%)Yuav kom txo qis cais kev pheej hmoo.
(6) Kev Txom Nyem Kev Pab Txhawb Kev Hloov (Lwm Yam)
Yog tias tsis tas yuav tawv tsis tas yuav, siv600-650 QIB DEGECT ntxhov siabhloov quenching.
3. Kev sib piv nrog lwm cov huab cua
| Qib hlau | Raug Kev Kho Cua Sov Cua Sov | Quenching kev pheej hmoo | Lwm txoj kev daws teeb meem |
|---|---|---|---|
| Spa-H (Jis G3125) | Raws li-rolled / normized | Siab(Yog hais tias quenched) | Kev sivli nofab ntxeev |
| Corten A (ASTM A588) | Raws li-dov | Tswj kav | Zam txhob quenching |
| S355J0WP (EN 10025-5) | Zoo li cas | Qi(yog hais tias yooj yim tempered) | Kev Ntsuas Siab Pom Zoo |
Tag
Spa-h yuav tsum tsis txhob quenchedHauv cov ntawv thov txheem vim yog nws cov cua ua hluav taws xob.
Yog hais tias quenching yog unavoidable:
Siv roj / polymer quenching(tsis yog dej).
Ib txwm npau taws tam sim ntawd(550-650 degree).
Preheat & tswj cov nqi txiaskom txo qis zuj zus.
Rau cov qauv siv,ib txwm los yog raws li-dovyog nyiam.
