416 vs 303 Dawb-Machining Stainless Steels: Martensitic vs Austenitic Machinability

 

Dab tsi yog lawv cov ntsiab lus tseem ceeb thiab qhov sib txawv ntawm kev ua haujlwm tseem ceeb?

416 (UNS S41600) muaj 11.5–13.5% Cr, Tsawg dua lossis sib npaug li 0.15% C, 0.15–0.35% S, thiab tsis muaj nickel. Nws tuaj yeem ua kom sov-kho rau 45 HRC rau kev hnav tsis kam, ua rau nws zoo tagnrho rau siab - lub zog machined qhov chaw.303 (UNS S30300) muaj 17-19% Cr, 8-10% Ni, 0.15-0.35% S, nrog cov pa roj carbon tsawg. Nws tsis yog-sib nqus, tsis tuaj yeem ua kom sov- hardened, thiab muaj corrosion kuj piv rau 304 stainless hlau.Ob qib muaj sulfur inclusions uas tawg chips thaum machining, txo cov cuab yeej hnav thiab txhim kho nto tiav.

Yuav ua li cas lawv cov khoom pub dawb -machining khoom haum raws li kev xav tau ntau lawm?

416's sulfur ntxiv thiab cov qauv martensitic tso cai rau siab -kev ceev machining ntawm qhov chaw xws li valve stems, twj tso kua mis, thiab fasteners uas yuav tsum tau post-machining tshav kub kev kho mob rau hardness.303's austenitic qauv thiab sulfur cov ntsiab lus ua kom precision machining ntawm tsis yog- cov khoom siv rau cov khoom siv, cov khoom siv thiab cov khoom siv tawv tawv xws li cov khoom siv, cov khoom siv thiab cov khoom siv hlau. xav tau zoo corrosion kuj.416 tshuab sai dua 303 nyob rau hauv unhardened tej yam kev mob, thaum 303 ua smoother nto finishes rau aesthetic los yog precision - daim ntaub ntawv tseem ceeb.

Lawv cov corrosion kuj thiab hardness piv li cas rau qhov kawg - siv daim ntawv thov?

416 muaj kev tiv thaiv corrosion tsis zoo- txwv rau qhov chaw qhuav hauv tsev xws li cov tshuab ua haujlwm sab hauv. Nws yuav xeb sai sai hauv cov av ntub lossis cov ntug dej hiav txwv yam tsis muaj cov txheej tiv thaiv.303 muaj qhov nruab nrab corrosion tsis kam, zam me me ya raws thiab sab hauv tsev / sab nraum zoov huab cua, txawm hais tias nws tsis pom zoo rau marine los yog tshuaj ib puag ncig.416 lub tshav kub-kho hardness (txog 45 HRC) outperforms siab tshaj plaws ntawm HRC (txog li 303's). xaiv rau hnav- ntu ntu.

Dab tsi yog daim ntawv thov raug cai rau ob qib no?

416 yog siv rau machined mechanical qhov chaw uas yuav tsum tau muaj zog thiab hnav tsis kam: lub cav li qub, cov khoom siv phom, thiab cov khoom siv fasteners rau qhov chaw qhuav.303 yog teev rau precision machined qhov chaw uas xav tau corrosion kuj: instrumentation Cheebtsam, khoom noj khoom haus ua machinery fittings, thiab hluav taws xob cov khoom vaj tse.Neeg qib yog tsim nyog rau welded sib dhos - sulfuring ntxiv.

Dab tsi yog cov lus qhia tseem ceeb ntawm kev tsim khoom thiab kev txwv?

Tshuab ob qib nrog cov cuab yeej carbide thiab siab -siab coolant kom txo cov cuab yeej hnav los ntawm cov sulfur inclusions.Heat- kho 416 tam sim ntawd tom qab machining (quench ntawm 980 degree, temper ntawm 200 degree) kom ua tiav qhov siab tshaj plaws hardness thiab hnav tsis kam. Zam txhob siv 416 hauv siab 393} ib puag ncig thiab corrosive. daim ntawv thov- xaiv 17-4 PH lossis 316L ua lwm txoj hauv kev rau kev sib tshooj.