Cov khoom siv dab tsi yog 904L alloy? Puas yog 904L yuav hloov tag nrho los ntawm duplex stainless hlau?

Cov khoom siv dab tsi yog 904L alloy? Puas yog 904L yuav hloov tag nrho los ntawm duplex stainless hlau?

Cov khoom siv dab tsi yog 904L alloy? Raws li 20% chromium thiab 25% npib tsib xee cov ntsiab lus, 904L alloy yog ntau dua alloyed austenitic stainless hlau uas tau tsim los rau cov ntawv thov uas muaj dilute liu acids.

904L Cov khoom xyaw tsom xam:

Cov pa roj carbon tsawg dua lossis sib npaug rau 0.02% Chromium 19.00-23.00%

Manganese Tsawg dua lossis sib npaug rau 2.00% Nickel 23.00-28.00%

Silicon Tsawg dua lossis sib npaug rau 1.00% Molybdenum 4.00-5.00%

Phosphorus Tsawg dua lossis sib npaug rau 0.045% Copper 1.00-2.00%

Sulfur Tsawg dua lossis sib npaug rau 0.035%

Austenitic stainless hlau yog dav siv vim lawv muaj, tus nqi qis, tsim nyog corrosion kuj thiab zoo cuam tshuam toughness. Ua kom cov chromium thiab molybdenum cov ntsiab lus yuav ua tau zoo txhim kho pitting corrosion kuj ntawm austenitic stainless hlau. Nyob rau hauv cov ntaub ntawv ntawm 904L alloy (UNS N08904, 1.4539), 1-2% tooj liab kuj ntxiv, uas paub tias muaj zog tiv taus cov acids xws li leucine thiab phosphoric acid. Yog li ntawd, nws tau siv dav hauv ntau cov txheej txheem tshuaj lom neeg kev lag luam ntawm daim hlau thiab cov pas nrig.

Qhov hnyav, siab nickel cov ntsiab lus ntawm 904L alloy txhais tau tias nws kim dua li cov hlau tsis huv. Raws li qhov tshwm sim, 904L alloy tau raug hloov los ntawm tus nqi ntau dua super duplex stainless hlau (SDSS). Lub zog tawm los ntawm super duplex stainless hlau yog 2-3 zaug ntawm 904L alloy, uas txhais tau hais tias nws tuaj yeem siv rau hauv cov thicknesses me me kom ua tiav cov haujlwm zoo ib yam. Lub PREN ntawm super duplex hlau yog ntau dua 40, thaum lub PREN ntawm alloy 904L yog ntau dua 43, yog li lawv yog roughly piv. Txawm li cas los xij, Ferralium 255 (UNS S32550, F61, 1.4507) kuj tseem siv tib cov ntsiab lus tooj liab ntxiv li 904L alloy, uas ua rau muaj kev tiv thaiv zoo heev hauv ntau yam kev txo cov kua qaub. Lub zog muaj zog kuj tseem ua rau nws zoo dua hnav tsis kam piv rau Ferralium 255, ua rau nws zoo tagnrho rau siv hauv cov khoom sib tov thiab cov khoom sib tov.

Lub ntsiab yog vim li cas mus txuas ntxiv siv 904L alloy es tsis txhob super duplex stainless hlau yog tias qhov kev khiav hauj lwm kub yog qis dua los yog siab tshaj qhov tsim nyog kev khiav hauj lwm ntau ntawm SDSS. Vim tias nws yog austenite, nws tseem tuaj yeem tuav nws qhov cuam tshuam rau qhov kub thiab txias (-196 degree ).