Kev sib piv ntawm 440A, 440B thiab 440C Stainless Hlau: Siab -Carbon Martensitic Gradient Qib

440A, 440B thiab 440C yog qib gradient hauv 440 series, nrog rau qhov sib txawv ntawm cov ntsiab lus carbon. Nrog rau qhov nce ntawm cov ntsiab lus carbon (440A: 0.60-0.75%, 440B: 0.75-0.95%, 440C: 0.95-1.20%), lawv hardness thiab hnav tsis kam maj mam nce, thaum toughness maj mam txo. Qhov gradient no ua rau lawv haum rau qhov sib txawv hnav tsis kam thiab toughness tshuav nyiaj li cas.

Core Parameter Sib piv

Parameter	440A Stainless hlau	440B Stainless hlau	440C Stainless hlau
Chemical Composition (wt%)	C=0.60-0.75, Cr=16.00-18.00, Fe=Balance	C=0.75-0.95, Cr=16.00-18.00, Fe=Balance	C=0.95-1.20, Cr=16.00-18.00, Fe=Balance
Mechanical Properties (Quenched & Tempered)	Tensile Strength Ntau dua los yog sib npaug rau 795MPa, Tawm Zog Ntau dua lossis sib npaug rau 550MPa, Elongation Ntau dua lossis sib npaug li 12%, Hardness 55-57HRC	Tensile Strength Ntau dua los yog sib npaug rau 860MPa, Yield Strength Ntau dua lossis sib npaug rau 620MPa, Elongation Ntau dua lossis sib npaug rau 12%, Hardness 57-59HRC	Tensile Strength Ntau dua los yog sib npaug rau 950MPa, Tawm Zog Ntau dua lossis sib npaug rau 700MPa, Elongation Ntau dua lossis sib npaug li 10%, Hardness 60-62HRC
Kev Pabcuam Kub	-20℃rau 250 degree	-20℃rau 250 degree	-20℃rau 250 degree
Qib sib npaug	SUS440A (JIS), EN 1.4104, UNS S44002	SUS440B (JIS), EN 1.4109, UNS S44003	SUS440C (JIS), EN 1.4125, UNS S44004

Qhov tseem ceeb ntawm kev ua tau zoo sib txawv: 1. Hardness gradient: 440A (55-57HRC) < 440B (57-59HRC) < 440C (60-62HRC); 440C lub hardness yog qhov siab tshaj plaws, ze rau cov cuab yeej steel. 2. Hnav tsis kam gradient: Hauv cov qauv kev ntsuas abrasive, hnav poob 440A> 440B> 440C; 440C's hnav tsis kam yog 1.5-2 npaug ntawm 440A. 3. Toughness gradient: Impact toughness 440A (Ntau dua lossis sib npaug rau 20J)> 440B (Ntau dua lossis sib npaug rau 18J)> 440C (Ntau dua lossis sib npaug rau 15J); 440C yog qhov ua rau tawg tawg yooj yim. 4. Machinability: 440A yog qhov yooj yim tshaj rau tshuab, 440C yog qhov nyuaj tshaj plaws, xav tau cov cuab yeej tshwj xeeb thiab cov txheej txheem. 5. Tus nqi: 440C yog 15-20% kim dua 440A, 8-12% B kim tshaj 4.

Siv tau Scenario Distinction: 440A yog haum rau cov khoom uas yuav tsum tau sib npaug hardness, toughness thiab hnav tsis kam, xws li tsev neeg siab - qib chav ua noj riam, txiab, qis -ceev bearing rings, thiab dav precision pwm . 440B yog haum rau cov khoom uas yuav tsum tau hnav tsis kam thiab nruab nrab toughness, xws li yos hav zoov riam{4}}, nruab nrab siab -siab valve cores, thiab siab- hnav yas pwm cores. 440C yog haum rau cov khoom uas yuav tsum tau ultra-siab hnav tsis kam thiab tsis tshua muaj kev cuam tshuam, xws li kws ua zaub mov riam, phais scalpels, siab -ceev bearing raceways, ultra- thiab precision molding cov cuab yeej (micrometers).

Tswv yim Q&A

Q1: Vim li cas 440C yog cov khoom siv zoo tshaj plaws rau siab- riam phom tshaj lij? A1: Nws ultra-siab hardness (60-}62HRC) ua kom cov ntug tuav tau zoo, uas tuaj yeem tswj xyuas qhov ntse tom qab txiav cov ntaub ntawv nyuaj rau lub sijhawm ntev; iav- polished nto yog yooj yim los ntxuav; nws yog tus qauv kub rau high-end riam.

Q2: Dab tsi yog txoj cai xaiv ntawm 440A / B / C rau cov kabmob? A2: Xaiv 440A rau qis-ceev, qis-load bearings (xws li textile machine bearings); xaiv 440B rau nruab nrab- nrawm, nruab nrab-load bearings (xws li cov khoom siv dav dav); xaiv 440C rau siab-ceev, siab{11}}load bearings (xws li precision machine tool bearings).

Q3: Yuav ua li cas kom tsis txhob temper brittleness thaum kho cua sov ntawm 440 series? A3: nruj me ntsis tswj lub tempering kub, zam 300-450 degree; Qhov zoo tshaj plaws tempering kub rau 440A yog 180-220 degree, 440B yog 180-220 degree, 440C yog 150-200 degree; txias hauv huab cua sai sai tom qab tempering.

Q4: Dab tsi yog qhov corrosion kuj ntawm 440 series? A4: Zoo ib yam, txhua tus muaj qhov nruab nrab corrosion kuj nyob rau hauv ib puag ncig qhuav; 440C cov ntsiab lus siab dua me ntsis ua rau nws cov corrosion kuj me ntsis; txhua yam yog yooj yim rau xeb hauv av los yog chloride- muaj ib puag ncig, xav tau kev kho mob passivation.

Q5: Yuav ua li cas sib npaug tus nqi thiab kev ua haujlwm thaum xaiv 440A / B / C? A5: Xaiv 440A yog tias pob nyiaj siv tsawg thiab kev ua haujlwm sib npaug yuav tsum tau ua; xaiv 440B yog xav tau kev hnav siab thiab tus nqi nruab nrab; xaiv 440C yog tias ultra-siab hnav tsis kam yog qhov tseem ceeb thiab tus nqi tsis muaj kev txhawj xeeb.