Yuav ua li cas xaiv cov khoom ntawm bolts ntau lawm

Cov khoom siv kho tshuab ntawm bolts raug cuam tshuam los ntawm cov khoom siv raw thiab kev kho cua sov. Feem ntau, cov khoom siv raw muaj kev cuam tshuam ntau dua rau cov khoom ntawm cov bolts vim tias cov khoom ntawm cov khoom siv raw khoom txiav txim siab qhov txwv ntawm kev kho cua sov.. Piv txwv li, raw cov ntaub ntawv uas tsis muaj Cr tsis tuaj yeem ua tiav lub zog tensile ntawm a 10.9 qib bolt.

Feem ntau, thaum cov neeg siv khoom tsis muaj cov cai tshwj xeeb, peb pom zoo kom txiav txim siab cov khoom siv raw rau bolt ntau lawm raws li tus neeg siv khoom siv scenario. Piv txwv li, nyob rau hauv kev tsim kho kev lag luam, nws raug pom zoo kom siv bolts ntawm qib 8.8 los yog siab dua rau steel qauv, thiab hauv kev lag luam automotive, bolts ntawm qib 10.9 lossis siab dua yog pom zoo rau kev sib txuas.

Thaum cov neeg siv khoom muaj cov kev xav tau tshwj xeeb rau qib bolt, peb feem ntau xaiv bolts raws li ISO898 tus qauv rau metric bolts.

Cov hauv qab no yog cov cai rau cov khoom siv raw khoom hauv ISO898:

Khoom chav kawm	Khoom siv thiab kub kev kho mob	Tshuaj muaj pes tsawg leeg txwv					Tempering kub
		(pov tseg tsom xam, %)ib
		C		P	S	B^b	°C
		min.	max.	max.	max.	max.	min.
4.6^{c ua d}	Carbon steel los yog carbon steel nrog additives		0,55	0,050	0,060	Tsis tau teev tseg	—-
4.8^d		—
5.6^c		0,13	0,55	0,050	0,060
5.8^d		—	0,55	0,050	0,060
6.8^d		0,15	0,55	0,050	0,060
8.8^f	Carbon steel nrog additives (e.g. Boron los yog Mn los yog Cr) quenched thiab tempered	0,15e	0,40	0,025	0,025	0,003	425
	los yog
	Carbon steel quenched thiab tempered
	los yog	0,25	0,55	0,025	0,025
	Alloy steel quenched thiab tempered	0,20	0,55	0,025	0,025
9.8^f	Carbon steel nrog additives (e.g. Boron los yog Mn los yog Cr) quenched thiab tempered	0,15e	0,40	0,025	0,025	0,003	425
	los yog
	Carbon steel quenched thiab tempered
	los yog	0,25	0,55	0,025	0,025
	Alloy steel quenched thiab tempered	0,20	0,55	0,025	0,025
10.9^f	Carbon steel nrog additives (e.g. Boron los yog Mn los yog Cr) quenched thiab tempered	0,20e	0,55	0,025	0,025	0,003	425
	los yog
	Carbon steel quenched thiab tempered
	los yog	0,25	0,55	0,025	0,025
	Alloy steel quenched thiab tempered	0,20	0,55	0,025	0,025
12.9^{f h ua} ⁱ	Alloy steel quenched thiab tempered	0,30	0,50	0,025	0,025	0,003	425
12.9^{f h i}	Carbon steel nrog additives (e.g. Boron los yog Mn los yog Cr los yog Molybdenum) quenched thiab tempered	0,28	0,50	0,025	0,025	0,003	380
a Thaum muaj kev sib cav, cov khoom tsom xam siv.
b Cov ntsiab lus Boron tuaj yeem ncav cuag 0,005 %, muab boron tsis zoo yog tswj los ntawm kev sib ntxiv ntawm titanium thiab / lossis txhuas.
c Rau txias forged fasteners ntawm cov cuab yeej chav kawm 4.6 thiab 5.6, Kev kho cua sov ntawm cov hlau siv rau txias forging los yog txias forged
fastener nws tus kheej tej zaum yuav tsim nyog kom ua tiav qhov xav tau ductility.
d Dawb txiav steel yog tso cai rau cov cuab yeej cuab tam chav kawm nrog cov sulfur siab tshaj plaws hauv qab no, phosphorus thiab txhuas cov ntsiab lus:S: 0,34 %; P: 0,11 %; Pb: 0,35 %.
e Nyob rau hauv cov ntaub ntawv ntawm dawb carbon boron steel nrog ib tug carbon cov ntsiab lus hauv qab no 0,25 % (kev tsom xam), qhov tsawg kawg nkaus manganese cov ntsiab lus yuav tsum yog 0,6 % rau chav kawm khoom vaj khoom tsev 8.8 thiab 0,7 % rau cov chav kawm khoom vaj khoom tsev 9.8 thiab 10.9.
f Rau cov ntaub ntawv ntawm cov chav kawm khoom vaj khoom tsev, yuav tsum muaj ib tug txaus harden peev xwm los xyuas kom meej ib tug qauv uas muaj
kwv yees 90 % martensite nyob rau hauv cov tub ntxhais ntawm threaded seem rau cov fasteners nyob rau hauv lub "as-hardened" mob ua ntej tempering. g Cov hlau alloy no yuav tsum muaj tsawg kawg yog ib qho ntawm cov ntsiab lus hauv qab no hauv qhov tsawg kawg nkaus uas tau muab: chromium 0,30 %, npib tsib xee 0,30 %, molybdenum 0,20 %, vanadium 0,10 %. Qhov twg cov ntsiab lus tau teev nyob rau hauv ob peb ua ke, peb lossis plaub thiab muaj cov ntsiab lus alloy tsawg dua li cov uas tau hais los saum no, tus nqi txwv yuav tsum tau thov rau kev txiav txim siab hauv chav kawm steel yog 70 % ntawm tus lej ntawm tus kheej txwv tus nqi teev saum toj no rau ob, peb lossis plaub yam kev txhawj xeeb.
h Fasteners uas tsim los ntawm phosphate raw khoom yuav tsum dephosphated ua ntej kev kho cua sov; qhov tsis muaj phosphorus enriched txheej yuav tsum tau kuaj pom los ntawm ib txoj kev kuaj tsim nyog.
Kuv Ceev faj yog qhia thaum siv cov khoom vaj khoom tsev 12.9/12.9 raug txiav txim siab. Lub peev xwm ntawm cov fastener tsim tawm, cov kev pab cuam thiab cov txheej txheem wrenching yuav tsum tau txiav txim siab. Ib puag ncig tuaj yeem ua rau muaj kev ntxhov siab corrosion tawg ntawm fasteners raws li kev ua tiav nrog rau cov coated.

Yog tias koj muaj lwm lo lus nug txog kev tsim cov bolts, pls xav tiv tauj peb.

Sherry Cen

JMET CORP., Jiangsu Sainty International Group

Chaw nyob: Tsev D, 21, Software Avenue, Jiangsu, Tuam Tshoj

Tel. 0086-25-52876434

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