440C stainless hlau phaj

440C(UNS npe S44004) yog martensitic 400 series stainless hlau,^[1]thiab muaj cov ntsiab lus siab tshaj plaws ntawm 400 stainless hlau series. Nws tuaj yeem raug kho kom sov kom ncav cuag hardness ntawm 58 txog 60 HRC. Nws tuaj yeem siv los ua dov hu rau stainless bearings, xws li pob bearings thiab cov menyuam bearings. Nws kuj yog siv los ua cov hniav riam.

 

Q1: Dab tsi yog cov tshuaj muaj pes tsawg leeg ntawm 440C stainless hlau?

A1: 440C yog siab tshaj -carbon martensitic stainless hlau nrog cov tshuaj lom neeg muaj pes tsawg leeg (wt%): Carbon (C) 0.95-1.20, Chromium (Cr) 16.00-18.00, Molybdenum (Mo) 0.75-1.25, Manganese. dua li (Mn) sib npaug (Mn) los yog sib npaug li 1.00, Phosphorus (P) Tsawg dua lossis sib npaug ntawm 0.040, Sulfur (S) Tsawg dua lossis sib npaug rau 0.030, thiab Nickel (Ni) Tsawg dua lossis sib npaug rau 0.60. Cov ntsiab lus siab carbon thiab chromium pab txhawb rau nws zoo heev hardness thiab corrosion kuj.

 

Q2: Dab tsi yog cov khoom tseem ceeb ntawm 440C stainless hlau tom qab kev kho cua sov?

A2: Thaum kho cua sov kom zoo (quenched thiab tempered), 440C nthuav tawm cov khoom siv kho tshuab zoo: Tensile zog Ntau dua lossis sib npaug rau 1900 MPa, Lub zog muaj zog ntau dua lossis sib npaug li 1550 MPa, Elongation Ntau dua lossis sib npaug li 5%, txo thaj tsam Ntau dua lossis sib npaug rau 25%, thiab Cov Khoom Zoo Tshaj Plaws (HRC) . siab -load thiab hnav- daim ntaub ntawv tiv taus.

 

Q3: Dab tsi yog cov ntawv thov tseem ceeb ntawm 440C stainless hlau hauv kev lag luam thiab kev lag luam?

A3: 440C yog dav siv nyob rau hauv cov xwm txheej uas yuav tsum tau muaj siab hardness, hnav tsis kam, thiab nruab nrab corrosion kuj, xws li: Precision bearings, riam hniav thiab cutlery, cov cuab yeej phais, valve Cheebtsam, twj tso kua mis shafts, zog, nozzles, thiab txhua yam nyob rau hauv hnyav ib puag ncig. Nws kuj yog ib qho khoom siv rau siab -kev ua tau zoo stainless hlau fasteners thiab cuab yeej.

 

Q4: Ua li cas 440C stainless hlau txawv ntawm lwm yam 440-series stainless hlau (xws li, 440A, 440B)?

A4: Qhov sib txawv tseem ceeb nyob hauv lawv cov ntsiab lus carbon, uas cuam tshuam ncaj qha rau hardness thiab hnav tsis kam: 440A (C: 0.60-0.75) muaj cov ntsiab lus qis tshaj plaws, muab cov tawv tawv zoo dua tab sis qis dua hardness; 440B (C: 0.75-0.95) sib npaug toughness thiab hardness; 440C (C: 0.95-1.20) muaj cov ntsiab lus carbon siab tshaj plaws, muab qhov siab tshaj plaws hardness, hnav tsis kam, thiab ntug tuav, tab sis me ntsis txo toughness thiab weldability piv rau 440A thiab 440B.

 

Q5: Dab tsi yog cov txheej txheem kho cua sov pom zoo thiab kev txiav txim siab vuam rau 440C stainless hlau?

A5: - Kev kho cua sov: Cov txheej txheem pom zoo yog quenching (1010-1070 degree, roj lossis cua txias) ua raws li tempering (150-300℃rau qhov siab tshaj plaws hardness, lossis 400-600℃rau kev txhim kho toughness). Tsis txhob tempering ntawm 475-550℃los tiv thaiv embrittlement.