Stainless hlau 440: Ultra-Hard Martensitic Alloy rau siab - Hnav Precision Cheebtsam

Stainless hlau 440 yog ib tsev neeg ntawm qib siab -carbon martensitic qib (440A/B/C/F) renowned rau lawv qhov hnyav hnyav thiab hnav tsis kam, ua rau lawv tus qauv kub rau kev lag luam bearings, premium cutlery, thiab precision saib cov khoom. Nrog 16-18% chromium thiab mus txog 1.20% carbon, nws muab lub siab tshaj plaws hardness ntawm txhua hom stainless hlau qib.

Tshuaj muaj pes tsawg leeg (Key, % per ASTM A240)

Cov pa roj carbon (C): 0.60–1.20

Chromium (Cr): 16.00–18.00

Molybdenum (Mo): Tsawg dua lossis sib npaug rau 0.75 (440C nkaus xwb)

Manganese (Mn): Tsawg dua lossis sib npaug rau 1.00

Mechanical Properties (Kub-Kho)

Tensile Strength: Ntau dua lossis sib npaug rau 860 MPa

Yield zog: Ntau dua lossis sib npaug rau 620 MPa

Elongation hauv 50mm: Ntau dua lossis sib npaug li 8%

Hardness: mus txog 60 HRC (440C)

Kev Ua Haujlwm Zoo

Kev lag luam-Kev Ua Haujlwm Hardness: 440C mus txog 60 HRC, zoo tagnrho rau hnav-cov khoom tiv taus.

Superior Edge Retention: Cov kev xaiv saum toj kawg nkaus rau cov hniav nyiaj hniav kub zoo nkauj thiab cov tawv nqaij phais.

Dimensional Stability: Txhim kho qhov ua tau zoo tom qab kev kho cua sov rau cov saib thiab cov kabmob.

Daim ntawv thov

High- riam hniav thiab cov cutters muaj

Pob bearings thiab cov menyuam bearings

Saib iav thiab precision pwm Cheebtsam

Qib sib npaug

EN 1.4125 (440C), JIS SUS440A/B/C, DIN X90CrMoV18 (440C)

5 Cov Lus Nug & Cov Lus Teb

Dab tsi yog qhov txawv ntawm 440A, 440B, 440C, thiab 440F subtypes?Cov tsev neeg 440 txawv ntawm cov ntsiab lus carbon thiab molybdenum: 440A (0.60–0.75% C, tsis muaj Mo) yog cov ductile tshaj plaws, haum rau txiab thiab qis- hnav cutlery; 440B (0.75–0.95% C, tsis muaj Mo) sib npaug hardness thiab toughness rau kev yos hav zoov riam; 440C (0.95–1.20% C, 0.40–0.75% Mo) yog qhov nyuaj tshaj plaws (txog 60 HRC) thiab feem ntau hnav- tiv taus, siv rau cov kabmob thiab cov tshuab txiav; 440F yog ib qho dawb-machining variant ntawm 440C nrog ntxiv sulfur (0.15–0.30%) kom yooj yim dua precision machining ntawm watch gears. Molybdenum nyob rau hauv 440C txhim kho corrosion kuj thiab hardness, thaum sulfur nyob rau hauv 440F txo cov machining kev sib txhuam yam tsis muaj kev txi cov khoom tseem ceeb.

Vim li cas 440C yog qhov kev xaiv sab saum toj rau kev lag luam bearings?440C's ultra-siab hardness (60 HRC) muab qhov tshwj xeeb hnav tsis kam, tseem ceeb rau cov bearings uas tau txais kev sib cuag dov tsis tu ncua nrog lubrication tsawg. Nws cov ntsiab lus molybdenum txhim khu kev tiv thaiv corrosion rau cov khoom siv roj nplua nyeem thiab cov dej noo, tiv thaiv kev qaug dab peg thiab ncua kev pab cuam lub neej. Tsis zoo li carbon steel bearings, 440C tsis xeb, ua rau nws haum rau kev siv sab nraum zoov lossis ntub dej (piv txwv li, marine propeller shafts). Nws qhov kev ruaj ntseg zoo tom qab kev kho cua sov kom paub meej meej cov kabmob clearances, uas yog qhov tseem ceeb rau kev ua haujlwm du, qis - suab nrov hauv tshuab thiab tsheb. Tsis muaj lwm yam qib stainless hlau tuaj yeem phim 440C kev sib xyaw ua ke ntawm hardness thiab corrosion kuj rau kev siv cov kabmob.

Kev kho cua sov ua kom zoo li cas 440C lub zog rau kev siv sib txawv?440C yog cua sov-kho los ntawm peb cov txheej txheem- kauj ruam: austenitization (cua sov rau 980-1040℃kom yaj cov carbides), quenching hauv roj (kom tsim hard martensite), thiab tempering (kom sib npaug hardness thiab toughness). Tsawg-kub tempering (150-200 degree) khaws 60 HRC hardness rau tsis yog{10}} cuam tshuam qhov chaw xws li bearings, tab sis tawm ntawm cov hlau nkig. Nruab nrab-kub tempering (300–400 degree) txo qhov hardness mus rau 50–55 HRC thaum ua kom tawv, ua rau nws haum rau riam hniav uas yuav tiv taus me me. Tshaj- tempering saum 400℃ua rau softening ntau dhau (qis dua 50 HRC), yog li kev tswj qhov kub thiab txias yog qhov tseem ceeb kom phim cov hlau cov khoom rau daim ntawv thov kev xav tau.

Dab tsi yog qhov kev txwv tsis pub corrosion ntawm 440 qib?440 qib muaj kev tiv thaiv corrosion qis dua li qib austenitic zoo li 304 vim lawv cov ntsiab lus carbon siab, uas txo qhov txuas ntxiv ntawm cov txheej txheem tiv thaiv chromium oxide. 440A / B yog qhov yooj yim rau xeb hauv qhov chaw ntub dej, qab ntsev thiab yuav corrode nyob rau hauv kev sib cuag nrog dilute acids, thaum 440C's molybdenum cov ntsiab lus tseem muaj kev cuam tshuam rau cov tshuaj molybdenum. 316. Kev ua kom zoo (kev kho cov kua qaub kom tshem tawm cov kab mob hlau saum npoo) tuaj yeem txhim kho cov txheej txheem oxide thiab txhim kho corrosion, tab sis 440 qib tseem yuav tsum tau zam nyob rau hauv marine lossis tshuaj ib puag ncig. Rau cov teeb meem hnyav no, 316 bearings lossis cov cuab yeej nyiam dua, txawm tias lawv softer dua 440C.

Yog vim li cas 440F nyiam rau precision machining ntawm watch Cheebtsam?440F muaj sulfur (0.15-0.30%), uas ua raws li cov roj nplua nyeem hauv lub sijhawm ua haujlwm, txo kev sib txhuam ntawm cov cuab yeej txiav thiab cov khoom ua haujlwm. Qhov no tso cai rau kom ceev machining ceev, smoother nto tiav, thiab lub neej ntev lub cuab tam piv rau tus qauv 440C, uas yog notoriously nyuaj rau tshuab vim nws siab hardness . 440F khaws cia 440C lub core zog (txog 58 HRC tom qab tshav kub kev kho mob), yog li nws tseem xa cov hnav tsis kam rau cov saib iav thiab precision Cheebtsam. Yog tsis muaj leej faj, machining 440C yuav tsum tau hloov cov cuab yeej nquag thiab qeeb qeeb, nce cov nqi tsim khoom thiab txo qhov precision{10}} ua 440F qhov kev xaiv tsuas yog rau siab - ntim precision machining ntawm 440-series qhov chaw.