317L vs 316L Stainless hlau: Lub Molybdenum{2}} Txhim kho kho dua tshiab

 

Dab tsi yog cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, thiab kev siv thawj zaug ntawm 317L thiab 316L?
Ob leeg yog tsawg-carbon, molybdenum-cov kabmob austenitic stainless hlau. Standard 316L muaj li ntawm 16-18% Cr, 10-14% Ni, thiab 2-3% Mo. 317L nce cov yam tsawg kawg nkaus, feem ntau yog 18-20% Cr, 11-15% Ni, thiab 3-4% Mo. Lawv cov khoom siv kho tshuab tsis zoo sib xws, muab qhov zoo toughness thiab formability. Thaum 316L yog universal alloy rau marine thiab kev siv tshuaj, 317L tau teev tseg rau cov kev pabcuam hnyav dua li cov pa roj desulfurization scrubbers, tshuaj reactor linings, thiab pulp & paper digesters.

Nyob rau hauv qhov tshwj xeeb corrosive tej yam kev mob puas 317L muab ib tug txiav txim kom zoo dua 316L?
Qhov zoo ntawm 317L dhau los ua kev txiav txim siab hauv ib puag ncig nrog cov tshuaj chloride ntau dua, qis pH, thiab qhov kub siab. Piv txwv xws li kub, concentrated sulfate thiab chloride ntws nyob rau hauv cov tshuaj nroj tsuag, acidic condensates nyob rau hauv cov pa phem tswj cov cuab yeej, thiab cov txheej txheem uas muaj phosphoric los yog sulfuric acid nyob rau hauv nruab nrab concentrations. Nyob rau hauv cov xwm txheej no, 316L tuaj yeem ntsib kev xeb los yog pitting thaum lub sijhawm, qhov 317L cov ntsiab lus ntxiv ntawm cov hlau muab qhov kev nyab xeeb loj dua thiab lub neej ua haujlwm ntev dua, txo qhov kev pheej hmoo ntawm kev ua tsis tiav.

Kev tsim thiab kev siv vuam sib txawv li cas ntawm ob qib zoo sib xws?
Fabrication kev coj ua zoo sib xws, tab sis cov ntsiab lus alloy siab dua ntawm 317L yuav tsum tau ua tib zoo saib xyuas thaum vuam los tiv thaiv nws cov corrosion. Thaum ob qib siv qis- carbon muab tub lim (piv txwv li, 316L lossis 317L muab tub lim), ua kom muaj kev tiv thaiv roj txaus thiab tswj qhov kub ntawm qhov sib txawv yog qhov tseem ceeb tshaj rau 317L txhawm rau tiv thaiv oxidation thiab sib cais ntawm cov hlau alloying. Nws ua haujlwm siab dua me ntsis- tus nqi hardening kuj tseem yuav xav tau lub zog ntau dua thaum ua haujlwm txias ua haujlwm piv rau 316L.

Los ntawm tag nrho cov kev xav txog tus nqi, thaum twg hloov kho mus rau 317L los ntawm 316L ua kev ncaj ncees?
Qhov kev hloov kho tshiab yog tsim nyog thaum tus nqi ntawm qhov ua tsis tau tiav - suav nrog lub sijhawm tsim khoom, kev tu ib puag ncig, lossis kev hloov cov khoom siv - deb tshaj qhov nqi ntawm cov khoom. Yog tias kev kuaj corrosion lossis kev ua haujlwm hauv cheeb tsam qhia tau hais tias 316L ua haujlwm ntawm ntug ntawm nws lub peev xwm, qhia txog 317L yog qhov kev nqis peev zoo. Nws kuj tseem tsim nyog rau cov cuab yeej siv tshiab hauv qhov chaw muaj kev kub ntxhov, vim tias nws lub neej ntev dua feem ntau ua rau tus nqi qis dua ntawm cov tswv cuab txawm tias tus nqi pib ntau dua.

Dab tsi yog qhov kawg, cov lus qhia tswv yim rau cov kws ua haujlwm tshwj xeeb ntawm cov qib no?
Siv cov ntaub ntawv - tsav mus kom ze. Tshawb xyuas qhov chaw pabcuam rau cov ntsiab lus chloride, qhov kub thiab txias, pH, thiab muaj cov crevices. Yog hais tias cov xwm txheej yog ciam teb rau 316L raws li cov kab kos corrosion lossis kev lag luam, qhia 317L. Rau cov qauv dej hiav txwv, tshuaj me me, lossis kev ua zaub mov, 316L tseem yog qhov kev xaiv zoo tshaj plaws thiab kev lag luam. Tsis txhob saib 317L raws li kev hloov ncaj qha; nws yog qib tshwj xeeb rau kev txheeb xyuas, mob hnyav dua.