Ihe eji arụ ọrụ nke bolts na-emetụta ihe ọkụkụ na ọgwụgwọ okpomọkụ. N'ozuzu, ihe ndị na-emepụta ihe na-enwe mmetụta dị ukwuu na njirimara nke bolts n'ihi na ihe ndị dị na ngwaahịa na-ekpebi oke elu nke ọgwụgwọ okpomọkụ.. Ọmụmaatụ, akụrụngwa akụrụngwa na-enweghị Cr enweghị ike nweta ike tensile nke a 10.9 bolt ọkwa.

N'ozuzu, mgbe ndị ahịa na-enweghị kpọmkwem chọrọ, anyị na-akwado ikpebi akụrụngwa maka mmepụta bolt dabere na ọnọdụ ojiji nke ndị ahịa. Ọmụmaatụ, na ụlọ ọrụ ihe owuwu, a na-atụ aro ka iji bolts nke ọkwa 8.8 ma ọ bụ karịa maka ihe owuwu ígwè, na ụlọ ọrụ ụgbọ ala, bolts nke ọkwa 10.9 ma ọ bụ karịa ka akwadoro maka njikọ.

Mgbe ndị ahịa nwere ihe achọrọ maka ọkwa bolt, anyị na-ahọrọ bolts dịka ọkọlọtọ ISO898 si dị maka bolts metric.

Ihe ndị a bụ ihe achọrọ maka akụrụngwa bolt na ISO898:

Ngwongwo klasIhe onwunwe na ikpo ọkụ ọgwụgwọChemical mejupụtara okeIwe iwe okpomọkụ
(nkedo nyocha, %)a
CPSBbCelsius C
min.max.max.max.max.min.
4.6c dCarbon ígwè ma ọ bụ carbon ígwè nwere ihe mgbakwunye　0,550,0500,060Akọwapụtaghị ya—-
4.8d-
5.6c0,130,550,0500,060
5.8d-0,550,0500,060
6.8d0,150,550,0500,060
8.8fCarbon ígwè nwere ihe mgbakwunye (eg. Boron ma ọ bụ Mn ma ọ bụ Cr) emenyụ na iwe0,15e0,400,0250,0250,003425
ma ọ bụ
Carbon ígwè emenyụ na iwe
ma ọ bụ0,250,550,0250,025
Alloy ígwè emenyụ na iwe0,200,550,0250,025
9.8fCarbon ígwè nwere ihe mgbakwunye (eg. Boron ma ọ bụ Mn ma ọ bụ Cr) emenyụ na iwe0,15e0,400,0250,0250,003425
ma ọ bụ
Carbon ígwè emenyụ na iwe
ma ọ bụ0,250,550,0250,025
Alloy ígwè emenyụ na iwe0,200,550,0250,025
10.9fCarbon ígwè nwere ihe mgbakwunye (eg. Boron ma ọ bụ Mn ma ọ bụ Cr) emenyụ na iwe0,20e0,550,0250,0250,003425
ma ọ bụ
Carbon ígwè emenyụ na iwe
ma ọ bụ0,250,550,0250,025
Alloy ígwè emenyụ na iwe0,200,550,0250,025
12.9f h iAlloy ígwè emenyụ na iwe0,300,500,0250,0250,003425
12.9f h iCarbon ígwè nwere ihe mgbakwunye (eg. Boron ma ọ bụ Mn ma ọ bụ Cr ma ọ bụ Molybdenum) emenyụ na iwe0,280,500,0250,0250,003380
a Ọ bụrụ na esemokwu, nyocha ngwaahịa na-emetụta.
b Ọdịnaya boron nwere ike iru 0,005 %, Ọ bụrụ na a na-achịkwa boron na-adịghị arụ ọrụ site na mgbakwunye nke titanium na / ma ọ bụ aluminom.
c Maka oyi adịgboroja fasteners nke ihe onwunwe klaasị 4.6 na 5.6, ọgwụgwọ okpomọkụ nke waya eji eme oyi oyi ma ọ bụ nke oyi adịgboroja
fastener n'onwe ya nwere ike ịdị mkpa iji nweta ductility achọrọ.
d A na-ahapụ nchara nchara n'efu maka klaasị ihe onwunwe nwere sọlfọ kachasị na-esote,  phosphorus na ihe dị n'ime ya:S: 0,34 %; P: 0,11 %; Pb: 0,35 %.
e N'ihe banyere carbon boron ígwè larịị na a carbon ọdịnaya n'okpuru 0,25 % (nyocha nkedo), ọdịnaya manganese kacha nta ga-abụ 0,6 % maka klaasị ihe onwunwe 8.8 na 0,7 % maka klaasị ihe onwunwe 9.8 na 10.9.
f Maka akụrụngwa nke klaasị ihe onwunwe ndị a,  a ga-enwe ike siri ike zuru oke iji hụ na ihe owuwu nwere
ihe dị ka 90 % martensite na isi nke threaded ngalaba maka fasteners na "dị ka-ike" ọnọdụ tupu tempering. g nchara alloy a ga-enwe opekata mpe otu n'ime ihe ndị a na oke kacha nta enyere: chromium 0,30 %,  nickel 0,30 %, molybdenum 0,20 %, vanadium 0,10 %. Ebe akọwapụtara ihe ndị dị na ngwakọta nke abụọ, atọ ma ọ bụ anọ ma nwee ọdịnaya alloy na-erughị nke enyere n'elu, oke uru a ga-etinye maka mkpebi klaasị ígwè bụ 70 % nke nchikota nke onye oke ụkpụrụ kpọmkwem n'elu maka abụọ, ihe atọ ma ọ bụ anọ metụtara.
h A ga-ekpochapụ ihe nkedo emepụtara site na akụrụngwa phosphated tupu ọgwụgwọ okpomọkụ; enweghị nke ọcha phosphorus emeju oyi akwa ga-achọpụta ya site na usoro nnwale kwesịrị ekwesị.
A na-adụ ọdụ ịkpachara anya mgbe eji klas ihe onwunwe 12.9/12.9 a na-atụle. Ikike nke ihe nkedo emeputa, Ekwesịrị ịtụle ọnọdụ ọrụ na ụzọ mgbawa. Gburugburu ebe obibi nwere ike ime ka nrụgide corrosion na-agbawa ngwa ngwa dị ka esichara yana nke mkpuchi.

Ọ bụrụ na ị nwere ajụjụ ọzọ gbasara mmepụta bolts, pls chere ịkpọtụrụ anyị.

Sherry Cen

JMET Ụlọ ọrụ CORP., Otu òkè nke Jiangsu Sainty International Group

Adreesị: Ụlọ D, 21, Okporo ụzọ Software, Jiangsu, China

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