1. Dab tsi yog qhov txawv ntawm 304 thiab 316 stainless hlau seamless kav?
Qhov sib txawv tseem ceeb nyob rau hauv qhov sib ntxiv ntawm molybdenum hauv 316 stainless hlau, uas txhim kho nws cov corrosion kuj: ① Tshuaj muaj pes tsawg leeg: 316 muaj 2.00-3.00% Molybdenum (Mo), thaum 304 tsis muaj molybdenum; 316 muaj cov ntsiab lus npib tsib xee siab me ntsis (10.00{12}}14.00%) dua 304. ② Corrosion kuj: 316 muaj kev tiv thaiv zoo heev rau chloride ion corrosion, pitting corrosion, thiab crevice corrosion, ua rau nws haum rau marine ib puag ncig thiab corrosive media uas muaj chloride ions; 304 yog nquag pitting corrosion nyob rau hauv high-chloride ib puag ncig. ③ Daim ntawv thov: 304 yog siv rau cov xwm txheej dav dav corrosion-resistant (xws li kev ua zaub mov, kho kom zoo nkauj architectural), thaum 316 yog siv rau marine, tshuaj, thiab tshuaj industries nrog hnyav corrosion.
2. Vim li cas 316L stainless hlau seamless yeeb nkab haum rau qis - qhov kub thiab txias tshaj 316?
316L yog qhov qis- carbon version ntawm 316 stainless hlau (C Tsawg dua lossis sib npaug li 0.03%, thaum 316 muaj C Tsawg dua lossis sib npaug li 0.08%), uas ua rau nws tsim nyog rau qis- qhov kub thiab txias ib puag ncig rau cov laj thawj hauv qab no: ① Cov ntsiab lus qis dua cov pa roj carbon monoxide txo qhov tsim ntawm chromium impurities, tsis txhob muaj cov kab mob sib kis ntawm cov kab mob carbides. toughness ntawm cov yeeb nkab ntawm qhov kub thiab txias. ② 316L muaj qhov zoo dua qis- qhov kub thiab txias qhov kev ua tau zoo, nrog rau qhov cuam tshuam tsawg kawg nkaus ntawm 40 J ntawm -196 degree, uas tuaj yeem zam qhov tawg tawg hauv ultra- qhov kub thiab txias ib puag ncig (xws li kua nitrogen thiab kua oxygen thauj mus los). ③ Nws muaj qhov zoo ductility thiab toughness ntawm qhov kub thiab txias, uas tuaj yeem hloov mus rau qhov thermal expansion thiab contraction ntawm cov yeeb nkab hauv qhov kub thiab txias yam tsis muaj deformation lossis tawg.
3. Qhov kev pabcuam siab tshaj plaws ntawm 316 stainless hlau seamless yeeb nkab yog dab tsi, thiab yuav tsum tau ceev faj dab tsi hauv qhov kub siab - kev pabcuam?
Qhov siab tshaj plaws kev pabcuam kub ntawm 316 stainless hlau seamless yeeb nkab yog 870 degree, thiab luv luv -lub sij hawm siab tshaj plaws kev pabcuam kub yog 925℃. Kev ceev faj rau siab - qhov kub thiab txias: ① Zam kev ua haujlwm ntev - lub sijhawm ua haujlwm ntawm 450-850℃, vim tias qhov ntsuas kub no yuav ua rau nag lossis daus ntawm chromium carbides ntawm cov ciam teb, ua rau muaj kev cuam tshuam ntawm intergranular corrosion thiab txo lub neej kev pab cuam ntawm cov yeeb nkab. ② Yog tias cov yeeb nkab siv nyob rau hauv qhov kub thiab txias thiab corrosive ib puag ncig, nws raug nquahu kom siv cov tshuaj kho cua sov (cua sov rau 1050-1100 degree, cua txias sai) kom yaj cov precipitated carbides thiab kho cov corrosion kuj. ③ Tsis tu ncua tshuaj xyuas qhov chaw ntawm cov yeeb nkab rau oxidation, scaling, thiab tawg, thiab hloov cov yeeb nkab rau lub sij hawm yog tias pom muaj kev puas tsuaj.
4. Puas yog 304 stainless hlau seamless yeeb nkab siv rau hauv kev lag luam ua zaub mov? Cov kev cai yog dab tsi?
Yog lawm, 304 stainless hlau seamless yeeb nkab yog dav siv hauv kev lag luam ua zaub mov, thiab nws yuav tsum tau ua raws li cov cai hauv qab no: ① Cov tshuaj muaj pes tsawg leeg yuav tsum ua raws li tus qauv, tshwj xeeb tshaj yog cov ntsiab lus carbon tsawg dua lossis sib npaug li 0.08%, thiab tsis muaj cov khoom tsis zoo (xws li txhuas, cadmium) tshaj qhov txwv. ② Qhov saum npoo tiav yuav tsum siab (feem ntau Ra tsawg dua lossis sib npaug li 0.8 μm), uas yooj yim los ntxuav thiab zam cov khoom noj khoom seem seem thiab cov kab mob loj hlob. ③ Nws yuav tsum dhau cov zaub mov- ntawv pov thawj qib (xws li FDA daim ntawv pov thawj), kom ntseeg tau tias cov yeeb nkab tsis tso cov tshuaj phem rau hauv cov zaub mov. ④ Nws muaj kev tiv thaiv corrosion zoo rau cov khoom noj acids (xws li kua txiv hmab txiv ntoo, kua txiv hmab txiv ntoo) thiab cov tshuaj ntxuav, tsis txhob xeb thiab paug ntawm cov zaub mov.
5. Lub luag haujlwm ntawm chromium thiab npib tsib xee hauv 304 stainless hlau seamless yeeb nkab yog dab tsi?
Chromium (Cr) thiab npib tsib xee (Ni) yog cov tseem ceeb alloying ntsiab nyob rau hauv 304 stainless hlau, thiab lawv lub luag hauj lwm yog: ① Chromium: Thaum cov ntsiab lus mus txog ntau tshaj 12%, ib tug ntom chromium oxide zaj duab xis (passive zaj duab xis) yog tsim nyob rau saum npoo ntawm cov yeeb nkab, uas cais lub hauv paus hlau los ntawm corrosive nruab nrab thiab muab zoo heev corrosion kuj. nws kuj tseem txhim kho oxidation tsis kam thiab siab -kub lub zog ntawm cov yeeb nkab. ② Nickel: Txhim kho cov ductility, toughness, thiab weldability ntawm cov hlau, ua rau cov yeeb nkab yooj yim rau txheej txheem (xws li khoov, vuam); nws kuj tseem txhim kho cov qauv austenitic ntawm cov hlau, kom ntseeg tau tias cov yeeb nkab tswj kev ua haujlwm zoo ntawm chav tsev kub thiab tsis kub.
