Vim li cas cov hlau stainless bolts muaj Magnetism

Subconsciously, peb feem ntau ntseeg tias 304 thiab 316Stainless Hlau Boltsyog kiag li tsis muaj hlau nplaum . Cov neeg siv ntau yam yog qhov tsis muaj zog thiab yuav tsum muaj kev sib nqus yog qhov tsis muaj zog thiab yuav tsum tau muaj kev sib nqus yog qhov kev xav ntawm cov ntaub ntawv kev kawm txuj ci {}}

I {.} Cov khoom siv hauv kev faib tawm thiab sib nqus ntawm qhov steel bolts

Magnetism ntawm stainless hlau yog txiav txim siab los ntawm nws cov qauv crystalline, tsis yog ib leeg los ntawm nws cov ntsiab lus lossis cov ntsiab lus carbon:

1. Austenitic stainless hlau (300 series: tsis muaj sib nqus / nqus sib nqus)

Cov qib: Sus304 (06cr19NI10), Sus316 (06Cr17NI12MO2)

Cov Qauv Txheej Txheem: Feem ntau Austenite ntawm chav sov (lub ntsej muag sib xyaw ua ke sau lo lus teb chaws, tsis muaj zog lossis tsis muaj zog sib nqus (permeability} {{4 {4}

Qhov Chaw Sib Nqus Tiag:

Txias hau taub hau, xov dov, thiab lwm yam kev ua haujlwm txias ua haujlwm yuam cov kev hloov pauv ib nrab ntawm Austenite rau hauvtus ntaus tswv(Lub cev-chaw sau cov lus sau tseg, ferromagenetic), tsim kom muaj zog tsis muaj zog (Martensite cov ntsiab lus tuaj yeem ncav cuag ntau dua lossis sib npaug rau 20%) {4 {}

Annaling (e {{{0} g ., tuav ntawm 650℃rov qab mus rau Austenite rov qab mus rau Austenite rov qab mus rau Austeninism {}}

2. Martensitic Stainless Hlau (400 Series: Sib Nqus Sib Nqus)

Cov qib: Sus410 (12CR13, Sus420J2 (30cr13)

Cov Qauv Txheej Txheem: Daim duab martensite (Ferromagnetic qauv) tom qab muaj kev lom zem ntau dua lossis sib npaug los yog sib npaug los ntawm cov hlau nplaum muaj zog.

Tsim Kev Nkag:

Cov ntsiab lus ntau cov pa roj carbon ntau dua (0 {}} 1% -0.4}}}) kom tau raws li kev txiav txim siab rau tus kheej-tuj thiab drilling.

Magnetism yog qhov chaw muaj peev xwm ntawm Martensitic qauv, sterelated rau corrosion tsis kam (sholposion tsis zoo tshaj li 300 series).

Ii {.} kev cuam tshuam ntawm khaub thuas taub hau ntawm magnetism ntawm Austenitic Stainless hlau

1. Mechanism ntawm Magnetism los ntawm kev ua haujlwm txias

Thaum lub sij hawm txias, yas deformation ua rau Austenite (-fe) los hloov mus rau martensite ('-fe), nrog martensite cov ntsiab lus nce nrog deformation:

Ntawm 10% deformation, martensite cov ntsiab lus yog ~ 5%-8%, permeability}}}}} 2 (tsis muaj zog magnetism).

Ntawm 30% deformation, martensite cov ntsiab lus tuaj yeem ncav cuag 25%-30%, permeability}}}}}}}}}}}

2. Kev sib raug zoo ntawm cov hlau nplaum thiab kev ua tau zoo

Cov Khoom Siv Neeg Kho Tshuab: Lub taub hau txias ua rau muaj zog (e {. {1} {{1} {{{

Corrosion Kuj: Martensitic Transformation tsis ua kev puas tsuaj lub passive zaj duab xis (cr₂o₃), nrog rau ntsev kom ntau dua lossis sib npaug nrog tsis muaj hlau nplaum.

III {{.} Cov ntsiab lus thiab cov ntawv sau piav qhia txog cov txheej txheem Demagnetization

1. Lub cev demagnetization (ib ntus)

Txojkev: Muab qhov chaw nyob hauv ib qho kev sib txawv ntawm cov khoom sib nqus sib nqus (e {}}} g}!

Kev txwv: Magnetism tuaj yeem rov qab tau zoo vim tias qhov kev xav tau kub ntxiv, tsim nyog rau cov khoom siv hluav taws xob ib ntus ntawm cov khoom siv hluav taws xob) {3}

2. Kev kho cov tshuaj (tas mus li Demagnetization)

Kev ua: Cua sov rau {1050-1100℃(cua txias dua los ntawm 50℃rau inhibit martensite compation.

Ua rau: Martensite cov ntsiab lus<5%, permeability μ≤1.03, meeting permanent non-magnetic requirements (e.g., medical precision instruments, aerospace components).

Tus nqi: Ua tus nqi nce ntxiv los ntawm ~ 10%-15}}}%, tab sis tuaj yeem ua tau los ntawm huab hwm coj ntau dua .

IV {. Cov yam ntxwv sib txawv ntawm cov hlau dawb (noj sus303 ua piv txwv)

1. Kev sib xyaw-Magnetism cuam tshuam

Sulphur cov ntsiab lus: 0 {.}} {-0.30% (siab dua li 0.03%), sib sau Mns suav nrog machsiability.

Qhov Chaw Sib Nqus: Kev ntxhov siab hauv zos thaum lub sijhawm tig los ua Martensitic Transformation (cov ntsiab lus ~ 5%}}} 1.1-1.2.

2. Kev Ua Tau Zoo

Corrosion Kuj: Piv rau Sus304 (tib Chromium thiab Nickel cov ntsiab lus), Ntsev Tshuaj Tsuag Kuaj ntau dua lossis sib npaug rau 48 teev.

Daim Ntawv Thov Kev Pab Cuam: Haum rau me me-qaub screws (e . lathes, m} m5) ua tsis siv neeg lub tshuab ua kom tsis siv neeg rau machines efficient {}}

V . Kev Lag Luam Kev Lag Luam Horths thiab Kev Tshawb Fawb

HYTH 1: "Sib Nqus Stainless Hlau=qis dua steel hlau"

Counterexample: Sus410 yog cov khoom raug cai nyob rau hauv GB / T {1} {}} cov cuab yeej ntawm cov khoom ntiag tug ntawm martensitic qauv.

HYTH 2: "304/316 Yuav Tsum Ua Me Nyuam Tsis Sib Nqus"

Txheem siv: ASTM A {276-2020} Ua raws li cov hlau tsis muaj zog hauv cov khoom lag luam intergiancentic (EPR txoj kev xav tau) thiab cov khoom ntiag tug.

MYTH 3: "Demagnetization Txo cov hlau tsis muaj hlau"

Sim cov ntaub ntawv: Tom qab daws teeb meem, sud304 lub tensile lub zog, thiab corrosion resistiate tsawg dua lossis sib npaug}} ntawm tsis muaj cuam tshuam rau malrix prot {}}

VI {. sib nqus kev xeem thiab xaiv cov lus pom zoo

1. Cov hau kev qhia sai sai

2. Scenario-raws li xaiv rooj

Tag

Lub magnetism ntawmStainless Hlau BoltsCov txiaj ntsig los ntawm kev sib xyaw ua ke cov qauv crystalline (kev xaiv ua haujlwm ntawm 400 series yog qhov kev xav tau ntawm cov kev xav tau zoo li corrosion tsis kam, lub zog, thiab tsis muaj lub zog-Magnudgments, tsis txhob muaj kev sib cav sib ceg