410 vs 420 Stainless hlau: Martensitic Hardness Spectrum

 

Dab tsi yog cov tshuaj muaj pes tsawg leeg, muaj peev xwm hardening, thiab kev siv ntawm 410 thiab 420 stainless hlau?
Ob leeg yog chromium martensitic steels ncaj, nrog 410 muaj 11.5-13.5% Cr thiab 420 muaj 12-14% Cr. Lub ntsiab lus sib txawv yog carbon: 410 muaj qhov siab tshaj plaws ntawm 0.15%, thaum 420 muaj qhov tsawg kawg nkaus ntawm 0.15%, feem ntau yog siab dua. Qhov no tso cai rau 420 kom ua tiav qhov hardness siab dua (txog HRC 54-56) tom qab kev kho cua sov piv rau 410 (txog HRC 45). 410 yog siv rau cov khoom siv dav dav xws li fasteners, twj tso kua mis, thiab li qub . 420 tau teev tseg rau kev txiav cov npoo, cov cuab yeej phais, cov pwm yas, thiab cov khoom siv phom sij.

Cov ntsiab lus carbon sib txawv li cas cuam tshuam rau lawv cov khoom siv kho tshuab kawg tom qab kev kho cua sov?
Carbon yog lub hauv paus tseem ceeb uas tso cai rau martensite kom tawv. Cov pa roj carbon ntau dua hauv 420 tso cai tsim cov ntim ntau dua ntawm cov tawv chromium carbides thaum lub sij hawm austenitizing thiab quenching txheej txheem. Qhov no ua rau lub martensitic matrix nrog ntau dua intrinsic hardness thiab superior tsis kam rau abrasive hnav. Txawm li cas los xij, qhov no tseem txo cov tawv nqaij . 410, nrog rau nws cov pa roj carbon tsawg, ua tiav cov tawv tawv nrog cov ductility zoo dua thiab kev cuam tshuam. Qhov kev xaiv yog kev lag luam ncaj qha-tawm: 420 rau qhov siab tshaj plaws hardness, 410 rau qhov zoo dua toughness.

Hauv daim ntawv thov twg yog qhov tseem ceeb rau xaiv 420 tshaj qhov ntau thiab feem ntau pheej yig dua 410?
Xaiv 420 thaum lub luag haujlwm tseem ceeb ntawm cov khoom cuam tshuam nrog kev txiav, shearing, lossis tiv thaiv kev hnav tsis zoo. Qhov no suav nrog cov kws tshaj lij thiab cov neeg siv khoom siv cutlery, scalpels thiab txiab txiab, cov hniav siv rau kev txiav cov yas lossis textiles, thiab cov khoom siv hauv cov khoom noj khoom haus uas yuav tsum muaj lub ntsej muag ntse. Rau cov ntawv thov xws li lub qia valve lossis lub fastener, qhov kev tiv thaiv corrosion thiab nruab nrab lub zog xav tau tab sis tsis muaj zog hnav tsis kam, 410 zoo kawg nkaus tsim nyog thiab pheej yig dua.

Dab tsi yog cov ntsiab lus tseem ceeb rau kev kho cua sov ntawm ob qib no kom ua tiav qhov kev ua tau zoo?
Ob leeg xav tau kev kho cua sov zoo: austenitizing, quenching, thiab tempering. Rau 420, cov pa roj carbon ntau dua yuav tsum tau ceev faj tswj ntawm qhov kub thiab txias thiab lub sijhawm kom yaj cov carbides tag nrho yam tsis ua rau cov qoob loo loj hlob lossis khaws cia austenite. Nws tempering ntau yam yuav tsum tau ua tib zoo xaiv kom ua tau raws li qhov xav tau sib npaug ntawm hardness thiab toughness . 410 txoj kev kho mob feem ntau zam txim ntau dua. Ob qib yog raug rau decarburization, yog li tswj huab cua los yog lub tshuab nqus tsev kho cua sov yog pom zoo rau qhov tseem ceeb los xyuas kom meej tag nrho cov tawv nqaij.

Cov lus qhia kawg dab tsi yuav tsum yog tus neeg yuav khoom lossis tus tsim qauv ua raws thaum xaiv ntawm cov qib martensitic?
Cia lub luag haujlwm tseem ceeb uas yuav tsum tau txiav txim rau qhov kev xaiv. Nug: Puas yog qhov no yuav tsum nyob twj ywm ntse lossis tiv thaiv hnav tshaj lwm yam? Yog tias muaj, xaiv 420 thiab qhia qhov yuav tsum tau ua kom tawv. Puas yog qhov kev xav tau zoo corrosion kuj, lub zog nruab nrab, thiab kev cuam tshuam zoo dua tseem ceeb dua? Yog tias muaj, 410 yog qhov kev xaiv tsim nyog. Ib txwm xav txog tag nrho ib puag ncig: 420's hardness siab dua tuaj yeem txo qis me ntsis hauv kev tiv thaiv corrosion piv rau 410. Rau welded fabrications, nco ntsoov tias ob qib yuav tsum tau ua ntej - thiab tom qab -weld heat treatment.