Dab tsi yog cov khoom siv rau fasteners?
Dab tsi yog cov khoom siv rau fasteners?
Tam sim no, fasteners ntawm kev ua lag luam feem ntau suav nrog plaub cov ntaub ntawv raw: stainless hlau, carbon hlau, tooj liab, thiab txhuas alloy.
1. Carbon hlau. Tsawg carbon steel, nruab nrab carbon steel, siab carbon steel thiab alloy steel yog txawv los ntawm cov ntsiab lus carbon nyob rau hauv cov khoom siv carbon steel.
(1) Tsawg carbon steel C% Tsawg dua lossis sib npaug rau 0.25% feem ntau hu ua A3 steel hauv Suav teb. Txawv teb chaws, lawv yog lub hauv paus hu ua 1008, 1015, 1018, 1022, thiab lwm yam. Feem ntau yog siv rau hauv cov khoom uas tsis muaj zog cov qauv xws li qib 4.8 screws, qib 4 ceev, thiab me me screws. (Ceeb Toom: Laum tail screws feem ntau yog ua los ntawm 1022 raw khoom.)
(2) Nruab nrab carbon steel 0.25% 0.60%. Yeej tsis muaj kev siv cov khoom siv no hauv kev ua lag luam tam sim no.
(3) Alloy steel: Ntxiv cov khoom sib xyaw rau cov pa roj carbon zoo tib yam ntxiv rau qee qhov tshwj xeeb rau kev tsim steel: xws li 35, 40 chromium molybdenum, SCM435, 10B38. Qib 12.9 screws siv SCM435 chromium molybdenum alloy steel, thiab cov khoom tseem ceeb yog C thiab Si, Mn, P, S, Cr, Mo.
2. Stainless hlau. Cov qib khoom: 45, 50, 60, 70, 80 feem ntau muab faib ua martensite (18% Cr, 8% Ni) nrog kub tsis kam thiab zoo corrosion kuj. A1, A2, thiab A4 martensite (13% Cr) muaj qhov tsis muaj zog corrosion, siab zog, thiab hnav tsis kam. C1, C2, C4430 stainless hlau. 18% Cr zoo dua rau kev chim siab thiab muaj kev tiv thaiv corrosion zoo dua li austenite. Cov ntaub ntawv raw tam sim no nyob rau hauv kev ua lag luam feem ntau muab faib ua SUS302, SUS304 thiab SUS316 raws li lawv cov qib.
3. Tooj. Cov khoom siv feem ntau yog tooj dag thiab tooj liab alloy. Hauv kev ua lag luam, H62, H65, thiab H68 tooj liab feem ntau yog siv los ua cov khoom lag luam.
4. Txhuas Alloy muaj tsawg ntom ntom, tab sis muaj ntau compressive zog, uas yog ze rau lossis txawm tias ntawm tshav kub-resistant cam khwb cia hlau. Nws muaj cov yas zoo thiab tuaj yeem ua rau ntau yam txhuas profile. Nws muaj zoo hluav taws xob conductivity, tshav kub hloov thiab corrosion kuj. Industrially Nws yog dav siv thiab nws kev siv yog thib ob tsuas yog steel.
5. Alloy steel kuj hais txog chromium-molybdenum alloy steel, xws li SCM435, thiab lwm yam.
Common raw khoom rau fasteners
(I) Carbon steel, alloy steel, tshwj xeeb hlau
1. Bolts, screws, thiab screws ntawm qib 3.6, 4.6, 4.8, 5.6, 5.8, thiab 6.8 feem ntau siv cov pa roj carbon steel, thiab tsis tas yuav tsum muaj txheej txheem kev kho cua sov; Qib 8.8 thiab 9.8 feem ntau yog siv cov pa roj carbon tsawg ib puag ncig tus phooj ywg hlau lossis cov pa roj carbon nruab nrab, quenched thiab tempered; Qib 10.9 feem ntau yog siv qis- thiab nruab nrab-carbon alloy steel lossis hlau alloy, quenched thiab tempered; Qib 12.9 feem ntau siv hlau alloy, quenched thiab tempered.
2. Cov txiv ntseej qib 4, 5, thiab 6 feem ntau siv cov pa roj carbon steel, thiab tseem tuaj yeem ua los ntawm cov hlau tsis pub dawb, tsis tas yuav tsum muaj txheej txheem kev kho cua sov; Qib 8 thiab 9 feem ntau siv cov pa roj carbon nruab nrab, quenched thiab tempered; qib 10 thiab 12 yog los txhim kho lub cev. Yog tias tsim nyog, cov khoom siv hlau tuaj yeem ntxiv, quenched thiab tempered.
3. Teem screws 14H feem ntau yog ua los ntawm cov hlau, thiab tsis tas yuav tsum muaj txheej txheem kev kho cua sov; 22H thiab 33H feem ntau yog ua los ntawm carbon steel, quenched thiab tempered; 45H feem ntau yog ua los ntawm cov hlau alloy, quenched thiab tempered.
4. Flat washers HV140 feem ntau yog ua los ntawm cov pa roj carbon tsawg; HV300 feem ntau yog ua los ntawm cov pa roj carbon nruab nrab, thiab kev kho cua sov yuav tsum tau ua.
5. Self-tapping screws / laum rau tes feem ntau yog ua los ntawm cov pa roj carbon nruab nrab xws li SWRCH22A, thiab qhov chaw yuav tsum tau carburized.
6. Toothed thiab serrated locking washers, I-shaped thiab yoj-puab elastic washers feem ntau yog ua los ntawm 65Mn
7. Elastic washers feem ntau yog ua los ntawm cov cuab yeej steel 70/65Mn/60Si2Mn, quenched thiab tempered.
8. Pins feem ntau yog ua los ntawm cov hlau 35#, quenched thiab tempered HRC28-38, 45#, quenched thiab tempered HRC38-46; alloy steel 30CrMnSiA, quenched thiab tempered HRC 35-41; Tshwj xeeb steel 1Cr13/2Cr13, Cr17.i2, 1Cr18.I9Ti
(II) Stainless hlau raw khoom
Cov khoom siv steel hlau: Cov khoom siv ntawm cov hlau tsis muaj steel yog tsim los ntawm Q215 thiab Q235, nrog rau 25 thiab 45 steel cov ntaub ntawv. Cov xov ntawm cov bolts qee zaum xav tau qhov tseem ceeb txuas. Lub sijhawm no, 15Cr thiab 20Cr thiab 30CrMri steel alloys tuaj yeem raug xaiv los txhim kho cov khoom siv ntawm cov bolts. Nws muaj 9 yam tshuaj, xws li Ni, Cu, C, S, Si, P, Mn, thiab Cr. Stainless hlau cov ntaub ntawv:
201, 304, 316, 304L, 316L, 2205, 2507, 310S, 321, 904L, 667, thiab lwm yam.
Taw qhia rau hom: 302HQ feem ntau yog siv rau tapping; SUS304, A2 yog lwm lub npe rau nws, cov khoom siv tseem ceeb rau stainless hlau bolts, stainless hlau screws, stainless hlau washers thiab stainless hlau ceev, nrog ib tug me ntsis siab zog qib; SUS316 thiab SUS316L, uas yog, A4, muaj corrosive ntau dua A2, thiab kev tsim cov hlau stainless bolts, stainless hlau screws, stainless hlau washers thiab stainless hlau txiv ntseej muaj peev xwm muaj tib lub zog qib A2 los yog muaj zog dua A2.
