Standard fasteners nyob rau hauv kev ua lag luam feem ntau yog tsim los ntawm plaub hom ntaub ntawv: carbon steel, stainless hlau, tooj dag, thiab txhuas alloy.
1. Carbon hlau.
Cov pa roj carbon steel yog cais raws li cov ntsiab lus carbon rau hauv qis-carbon, nruab nrab- carbon, thiab siab- carbon steels, nrog rau cov hlau alloy.
Tsawg- carbon steel (C% Tsawg dua lossis sib npaug li 0.25%): Hauv tsev hu ua A3 steel; thoob ntiaj teb hu ua 1008, 1015, 1018, 1022, thiab lwm yam. Feem ntau siv rau cov khoom uas tsis muaj qhov tshwj xeeb hardness, xws li Qib 4.8 bolts, Qib 4 ceev, thiab cov ntsia hlau me me.
Bolts, screws, thiab studs: Qib 3.6, 4.6, 4.8, 5.6, 5.8, thiab 6.8 feem ntau siv carbon steel (tsis muaj kev kho cua sov); Qib 8.8 thiab 9.8 feem ntau siv qis-carbon alloy steel lossis nruab nrab- carbon steel (quenched thiab tempered); Qib 10.9 feem ntau siv qis / nruab nrab- carbon alloy steel lossis alloy steel (quenched thiab tempered); Qib 12.9 feem ntau siv hlau alloy (quenched thiab tempered).
Nruab nrab- carbon steel (0.25%
Siab - carbon steel (C% > 0.60%): Tsis tshua muaj siv nyob rau hauv kev ua lag luam tam sim no.
Alloy steel: Tsim los ntawm kev ntxiv cov ntsiab lus alloying rau cov pa roj carbon zoo tib yam los txhim kho cov khoom tshwj xeeb (xws li 35, 40CrMo, SCM435, 10B38). "Fangsheng" (Unbrako) Qib 12.9 cov ntsia hlau feem ntau siv SCM435 chromium-molybdenum alloy steel, tsim los ntawm C, Si, Mn, P, S, Cr, thiab Mo.
Stainless hlau
Feem ntau categorized rau hauv: Austenitic (18% Cr, 8% Ni) -zoo tshav kub tsis kam, corrosion kuj, thiab weldability (xws li, A1, A2, A4); Martensitic (13% Cr)- qis corrosion kuj tab sis siab zog thiab hnav tsis kam (xws li C1, C2, C4); thiab Ferritic-18% Cr, zoo taub hau / forging zog, thiab corrosion kuj superior rau qib martensitic.
Tooj. Cov khoom siv feem ntau suav nrog tooj dag thiab zinc- tooj liab alloys. H62, H65, thiab H68 tooj dag yog thawj qib siv rau cov qauv fasteners ntawm lub khw.
Aluminium Alloy. Tsawg ceev tab sis muaj zog siab (txog los yog tshaj qhov siab - zoo steel); zoo plasticity (tuaj yeem ua rau ntau yam profiles); zoo heev hluav taws xob conductivity, thermal conductivity, thiab corrosion kuj. Siv dav hauv kev lag luam; noj ntim yog thib ob tsuas yog steel.
Alloy Steel (tseem hais tshwj xeeb rau chromium-molybdenum alloy steel, xws li SCM435).2. Carbon Steel, Alloy Steel, thiab tshwj xeeb hlau pawg
Cov txiv ntseej: Qib 4, 5, thiab 6 feem ntau siv cov pa roj carbon steel lossis dawb- txiav hlau (tsis muaj kev kho cua sov); Qib 8 thiab 9 feem ntau siv nruab nrab - carbon steel (quenched thiab tempered); Qib 10 thiab 12 tuaj yeem suav nrog cov ntsiab lus alloying los txhim kho cov khoom siv kho tshuab yog tias tsim nyog (quenched thiab tempered).
Teem screws: Qib 14H feem ntau siv cov pa roj carbon steel (tsis muaj kev kho cua sov); Qib 22H thiab 33H feem ntau siv carbon steel (quenched thiab tempered); Qib 45H feem ntau siv hlau alloy (quenched thiab tempered).
Tus kheej-tapping screws/self-drilling screws: Feem ntau siv nruab nrab- carbon steel (xws li SWRCH22A); nto yuav tsum tau kho carburizing.
Plain washers: HV140 feem ntau siv qis- carbon steel; HV300 feem ntau siv nruab nrab - carbon steel (yuav tsum tau kho cua sov).
Caij nplooj ntoos hlav ntxhua khaub ncaws: Feem ntau siv lub caij nplooj ntoos hlav steel (70, 65Mn, lossis 60Si2Mn); quenched thiab tempered.
Toothed/serrated lock washers thiab eeb/yoj caij nplooj ntoos hlav ntxhua: Feem ntau siv 65Mn.
Pins: Feem ntau siv carbon steel (Qib 35 #, quenched thiab tempered rau HRC 28-38; Qib 45 #, quenched thiab tempered rau HRC 38-46); hlau alloy (30CrMnSiA, quenched thiab tempered rau HRC 35-41); los yog cov hlau tshwj xeeb (1Cr13/2Cr13, Cr17, 1Cr18Ni9Ti).