Hastelloy alloy tshwj xeeb cov khoom siv thiab kev taw qhia
Hastelloy alloy
I. Kev Taw Qhia
Hastelloy yog ib hom nickel-based alloy. Nws yog tam sim no muab faib ua peb series: B, C, thiab G. Nws yog tsuas yog siv rau corrosion muaj zog uas tsis tuaj yeem siv hlau-raws li Cr-Ni los yog Cr-Ni-Mo stainless hlau, cov khoom tsis yog xim hlau, thiab lwm yam. tau siv dav hauv roj av, tshuaj lom neeg kev lag luam, kev tiv thaiv ib puag ncig thiab ntau lwm qhov chaw txawv teb chaws. Nws cov qib thiab cov xwm txheej siv tau raug pom nyob rau hauv cov lus hauv qab no.
Txhawm rau txhim kho corrosion kuj thiab txias thiab kub ua haujlwm ntawm Hastelloy, Hastelloy tau ua peb qhov kev txhim kho loj. Txoj kev txhim kho yog raws li nram no:
B series: B → B-2(00Ni70Mo28) → B-3
C series: C → C-276(00Cr16Mo16W4) → C-4(00Cr16Mo16) → C-22 (00Cr22Mo13W3) → C-2000(00Cr20Mo16)
G series: G → G-3 (00Cr22Ni48Mo7Cu) → G-30 (00Cr30Ni48Mo7Cu)
Cov ntaub ntawv siv dav tshaj plaws tam sim no yog N10665 (B-2), N10276 (C-276), N06022 (C-22), N06455 (C-4) thiab N06985 ( G-3). Cov khoom siv tiam thib peb N10675 (B-3), N10629 (B-4), thiab N06059 (C-59) yog nyob rau theem nce qib. Vim tias kev nce qib ntawm kev siv tshuab metallurgical, ntau lub npe hu ua "super stainless hlau" uas muaj ~ 6% Mo tau tshwm sim nyob rau xyoo tas los no, hloov G series alloys, ua rau poob sai hauv kev tsim khoom thiab siv G series alloys.
2. Cov tshuaj muaj pes tsawg leeg ntawm Hastelloy alloy
3. Mechanical zog
Cov khoom siv kho tshuab ntawm Hastelloy yog qhov zoo heev. Nws muaj cov yam ntxwv ntawm lub zog siab thiab siab toughness, yog li nws nyuaj rau tshuab. Ntxiv mus, nws cov strain hardening nyiam yog heev muaj zog. Thaum lub deformation tus nqi nce mus txog 15%, nws yog hais txog 18-8 ob zaug ntawm stainless hlau. Hastelloy kuj muaj qhov nruab nrab qhov kub thiab txias rhiab heev, thiab nws qhov kev xav tau nce ntxiv nrog qhov nce ntawm deformation tus nqi. Thaum qhov kub thiab txias, Hastelloy yooj yim nqus cov ntsiab lus teeb meem, ua rau nws cov khoom siv dag zog thiab corrosion kuj txo.
4. Feem ntau siv Hastelloy alloys
1: Hastelloy B-2 alloy (Hastelloy B-2 alloy)
1. Corrosion kuj
Hastelloy B-2 alloy yog Ni-Mo alloy uas tsis tshua muaj carbon thiab silicon cov ntsiab lus. Nws txo cov nag lossis daus ntawm carbides thiab lwm theem hauv thaj chaw vuam thiab tshav kub, yog li ua kom ntseeg tau tias txawm tias nyob rau hauv cov txheej txheem vuam kuj muaj qhov zoo corrosion kuj. Raws li peb txhua tus paub, Hastelloy B-2 alloy muaj corrosion kuj zoo heev nyob rau hauv ntau yam kev txo cov xov xwm thiab tuaj yeem tiv taus corrosion ntawm txhua qhov kub thiab txias ntawm hydrochloric acid nyob rau hauv ib txwm muaj siab. Nws muaj corrosion kuj zoo heev nyob rau hauv non-aerated nruab nrab-concentration non-oxidizing sulfuric acid, ntau yam phosphoric acid, high-temperature acetic acid, formic acid thiab lwm yam organic acids, bromic acid thiab hydrogen chloride gases. Nyob rau tib lub sijhawm, nws tseem tiv taus corrosion los ntawm halogen catalysts. Yog li ntawd, Hastelloy B-2 alloy feem ntau yog siv rau ntau yam roj av hnyav thiab cov txheej txheem tshuaj, xws li distillation thiab concentration ntawm hydrochloric acid; alkylation ntawm ethylbenzene thiab qis-siab oxo synthesis ntawm acetic acid thiab lwm yam txheej txheem ntau lawm. Txawm li cas los xij, nws tau pom nyob rau hauv daim ntawv thov kev lag luam ntawm Hastelloy B-2 alloy rau ntau xyoo:
(1) Hastelloy B-2 alloy muaj ob qhov chaw rhiab heev uas muaj kev cuam tshuam loj heev rau kev tiv thaiv corrosion: thaj chaw kub kub ntawm 1200 ~ 1300 degree thiab thaj chaw nruab nrab kub ntawm 550 ~ 900 degree;
(2) Vim yog dendrite sib cais nyob rau hauv weld hlau thiab tshav kub-kho cheeb tsam ntawm Hastelloy B-2 alloy, intermetallic theem thiab carbides precipitate raws cov nplej ciam teb, ua rau lawv rhiab heev rau intergranular corrosion;
(3) Hastelloy B-2 alloy muaj qhov tsis zoo nruab nrab-kub thermal stability. Thaum cov ntsiab lus hlau nyob rau hauv Hastelloy B-2 alloy poob qis dua 2%, lub alloy yog rhiab heev rau kev hloov pauv ntawm beta theem (piv txwv li, Ni4Mo theem, kev txiav txim intermetallic compound). Thaum cov hlau nyob hauv qhov kub ntawm 650 ~ 750 degree rau ib lub sij hawm ntev me ntsis, cov theem yog generated instantly. Lub neej ntawm theem txo cov tawv tawv ntawm Hastelloy B-2 alloy, ua rau nws rhiab heev rau kev ntxhov siab corrosion, thiab txawm ua rau Hastelloy B-2 alloy yuav puas thaum lub sij hawm raw khoom (xws li kub dov txheej txheem) thiab cov txheej txheem tsim khoom siv (xws li Hastelloy B-2 cov khoom siv alloy tom qab vuam zuag qhia tag nrho kev kho cua sov) thiab Hastelloy B{12}} cov khoom siv hlau tawg tawg hauv qhov chaw pabcuam. Niaj hnub no, tus qauv xeem txoj kev tsim los ntawm kuv lub teb chaws thiab lwm lub teb chaws thoob ntiaj teb rau cov intergranular corrosion kuj ntawm Hastelloy B-2 alloy yog lub siab kub boiling hydrochloric acid txoj kev, thiab txoj kev ntsuam xyuas yog txoj kev poob phaus. Txij li Hastelloy B-2 alloy yog ib qho alloy resistant rau hydrochloric acid corrosion, ib txwm siab boiling hydrochloric acid txoj kev yog heev insensitive mus ntsuam xyuas lub intergranular corrosion nyiam ntawm Hastelloy B-2 alloy. Cov tsev kawm tshawb fawb hauv tsev tau siv cov txheej txheem kub hydrochloric acid los kawm Hastelloy B{17}} alloy thiab pom tias qhov corrosion kuj ntawm Hastelloy B{18}} alloy tsis tsuas yog nyob ntawm nws cov tshuaj muaj pes tsawg leeg, tab sis kuj nyob ntawm nws cov thermal. kev tswj cov txheej txheem. Thaum cov txheej txheem thermal ua tsis raug, cov nplej ntawm Hastelloy B-2 alloy tsis tsuas yog loj hlob, tab sis kuj yog theem siab Mo σ precipitates ntawm cov nplej. Nyob rau lub sijhawm no, kev tiv thaiv rau intergranular corrosion ntawm Hastelloy B-2 alloy txo qis heev. , nyob rau hauv high-temperature hydrochloric acid test, lub grain ciam etching qhov tob ntawm cov coarse-grained phaj thiab cov phaj ib txwm txawv li ntawm ob zaug.
