Qib 12.9 bolts khoom

Muaj peb yam khoom tseem ceeb rau qib 12.9 bolts (12.9 Nws, 12.9 mus rau bolt): carbon steel wedge thauj tog rau nkoj, stainless hlau wedge thauj tog rau nkoj, thiab tooj liab.

(1) Carbon steel (xws licarbon steel Wedge Anchor Bolts). Peb paub qhov txawv ntawm cov pa roj carbon tsawg, nruab nrab carbon steel, siab carbon steel thiab alloy steel raws li cov ntsiab lus carbon hauv cov khoom siv carbon steel.

1. Tsawg carbon steel nrog C% <0.25% feem ntau hu ua A3 steel hauv Suav teb. Txawv teb chaws, lawv yeej hu ua 1008, 1015, 1018, 1022, thiab lwm yam.

2. Cov pa roj carbon steel 0.25%

Alloy steel: Ntxiv cov ntsiab lus alloy rau cov pa roj carbon zoo tib yam kom nce qee cov khoom tshwj xeeb ntawm cov hlau: xws li 35, 40 chromium nyiaj, SCM435

3.10B 38. Fangsheng screws mas siv SCM435 chromium-platinum alloy steel, uas nws lub ntsiab Cheebtsam yog C, Si, Mn, P, S, Cr, thiab Mo.

(2) Stainless hlau (xws li stainless hlau threaded rods). Qib Kev Ua Haujlwm: 45, 50, 60, 70, 80, feem ntau austenite (18% Cr, 8% Ni), ua haujlwm kub zoo

Zoo corrosion kuj thiab zoo weldability. A1, A2, A4 martensite thiab 13% Cr muaj tsis zoo corrosion kuj, siab zog thiab zoo hnav tsis kam. C1, C

2. C4 ferritic stainless hlau. 18% Cr muaj zoo forgeability thiab muaj zog corrosion kuj tshaj martensite. Tam sim no, cov ntaub ntawv tuaj txawv teb chaws ntawm kev ua lag luam yog tsim nyob rau hauv Nyiv.

Saj. Raws li qib, nws feem ntau muab faib ua SUS302, SUS304 thiab SUS316.

3) tooj liab. Cov khoom siv feem ntau yog tooj dag… zinc-tooj ​​liab alloy. H62, H65, thiab H68 tooj liab feem ntau yog siv los ua tus qauv hauv kev ua lag luam.

12.9 Kev cuam tshuam ntawm ntau yam hauv cov khoom siv ntsia liaj qhov rooj ntawm cov khoom ntawm cov hlau:

1. Carbon (C): Txhim kho lub zog ntawm cov hlau qhov chaw, tshwj xeeb tshaj yog nws cov khoom kho cua sov, tab sis raws li cov ntsiab lus ntawm cov pa roj carbon monoxide nce, cov plasticity thiab toughness txo.

Thiab nws yuav cuam tshuam rau qhov txias vuam kev ua tau zoo thiab vuam kev ua tau zoo ntawm steel qhov chaw.

2. Manganese (Mn): Txhim kho lub zog ntawm cov hlau qhov chaw thiab txhim kho hardenability rau qee yam. Ntawd yog hais tias, qhov kev siv zog ntawm kev nkag mus rau qhov nyuaj yog nce thaum lub sij hawm tsim hluav taws.

Nws kuj tuaj yeem txhim kho qhov zoo ntawm qhov chaw, tab sis ntau dhau ntawm manganese ua rau muaj kev puas tsuaj rau ductility thiab weldability. Thiab nws yuav cuam tshuam rau kev tswj ntawm txheej thaum electroplating.

3. Nickel (Ni): Txhim kho lub zog ntawm cov hlau qhov chaw, txhim kho toughness ntawm qhov kub thiab txias, txhim khu kev tiv thaiv atmospheric corrosion, thiab ua kom ruaj khov kho cua sov.

Cov nyhuv kho yog txo cov nyhuv ntawm hydrogen embrittlement.

4. Chromium (Cr): Nws tuaj yeem txhim kho hardenability, txhim kho hnav tsis kam, txhim kho corrosion kuj, thiab pab tswj lub zog ntawm qhov kub thiab txias.

5. (Mo): Nws tuaj yeem pab tswj cov khoom tsim tau, txo qhov rhiab heev ntawm cov hlau rau temper brittleness, thiab ua lub luag haujlwm tseem ceeb hauv kev txhim kho lub zog tensile ntawm qhov kub thiab txias.

Kev cuam tshuam loj.

6. Boron (B): Nws tuaj yeem txhim kho lub hardenability thiab pab ua kom cov pa roj carbon tsawg ua cov lus teb rau kev kho cua sov.

7. Alum (V): refines austenite nplej thiab txhim kho toughness

8. Silicon (Si): Ua kom lub zog ntawm cov hlau qhov chaw. Cov ntsiab lus tsim nyog tuaj yeem txhim kho plasticity thiab toughness ntawm steel qhov chaw.

35CrMo steel yog cov khoom siv zoo heev rau qib 129 txuas lub cav bolts thiab tuaj yeem ua tau raws li cov cuab yeej cuab tam ntawm qib 12.9 bolts cov ntaub ntawv.

Nws yog cov txheej txheem ua tau los txais yuav kev tiv thaiv nitrogen tiv thaiv kev kho cua sov rau 12.9 qib txuas txuas bolts, thinning thiab txias ntawm tus pas nrig, thiab xov dov tom qab kev kho cua sov, thiab tuaj yeem tsim.

Ua tau zoo, high-precision bolts

Cov qib kev ua tau zoo ntawm bolts siv rau kev sib txuas steel qauv tau muab faib ua ntau tshaj 10 qib xws li 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, thiab 12.9.

Ntawm lawv, bolts ntawm qib 8.8 thiab siab dua yog ua los ntawm cov hlau tsis tshua muaj hlau lossis cov pa roj carbon nruab nrab thiab tau raug kho cua sov (quenched thiab tempered), feem ntau hu ua bolts siab zog.

Tus so yog feem ntau hu ua bolts zoo tib yam. Daim ntawv qhia qib qib bolt muaj ob feem ntawm tus lej, uas sawv cev rau tus nqi nominal tensile lub zog ntawm cov khoom siv ntsia liaj qhov rooj thiab

Yield-strength ratio. Piv txwv li, lub bolt nrog kev ua haujlwm qib 4.6 txhais tau tias:

1. Lub nominal tensile lub zog ntawm cov khoom siv ntsia liaj qhov rooj ncav cuag 400MPa;

Lub zog piv ntawm cov khoom siv ntsia liaj qhov rooj yog 0.6:

2. Lub nominal yield zog ntawm cov khoom siv ntsia liaj qhov rooj ncav cuag 400 × 0.6 = 240MPa kev ua tau zoo qib 10.9 siab zog bolts. Cov khoom tau raug cua sov

3. Tom qab ua tiav, nws tuaj yeem ua tiav:

1. Cov khoom siv ntsia liaj qhov rooj muaj lub zog tensile nominal ntawm 1000MPa.

2. Qhov kev tawm los-rau-lub zog piv ntawm cov khoom siv ntsia liaj qhov rooj yog 0.9:

3. Lub nominal yield zog ntawm cov khoom siv ntsia liaj qhov rooj ncav cuag 1000 × 0.9 = 900MPa qib

10.9 qib screws yuav tsum nruab nrab carbon alloy steel quenching thiab tempering kub kho, xws li 35CRMO 40CR thiab lwm yam ntaub ntawv

Lub bolt qib tshuaj xyuas qhov ntsuas yog lub zog tensile ntawm lub ntsia liaj qhov rooj. Nws tsis't teeb meem dab tsi cov khoom yog, dab tsi's tseem ceeb yog txhua yam ntsuas xws li tensile zog