Qhov sib txawv ntawm Stainless Hlau Thiab Galvanized Steel

Stainless hlau thiab galvanized steel ob leeg tiv thaiv corrosion zoo dua li cov pa roj carbon steel, tab sis lawv ua li ntawd nyob rau hauv txoj kev sib txawv: ib qho los ntawm nws cov alloy muaj pes tsawg leeg, lwm yam los ntawm zinc txheej. Qhov kev sib txawv ntawd cuam tshuam ntau dua li qhov tsos. Nws cuam tshuam txog kev ua haujlwm ntev, kev xav tau kev saib xyuas, nqi, kev ua haujlwm hauv qhov hnyav hnyav, thiab yuav ua li cas thaum cov khoom raug khawb lossis hnav dhau sijhawm. Qhov kev sib piv no piav qhia txog yuav ua li cas txhua yam khoom tsim tau, nws txoj kev tiv thaiv ua haujlwm li cas, qhov twg txhua qhov ua tau zoo tshaj plaws, thiab vim li cas qhov kev xaiv yog nyob ntawm daim ntawv thov yuav tsum tsis yog qhov kev xav yooj yim uas ib txwm ua tau zoo dua.

 

Stainless hlau vs Galvanized Steel Basics

Nkag siab txog qhov sib txawv ntawm cov hlau tsis muaj steel thiab cov hlau galvanized yog qhov tseem ceeb rau cov engineers, cov neeg ua haujlwm yuav khoom, thiab cov thawj tswj haujlwm. Ob qho khoom siv muaj kev txhim kho corrosion piv rau cov qauv liab qab carbon steel, tab sis lawv ua tiav qhov no los ntawm kev sib txawv ntawm cov hlau thiab tshuaj lom neeg.

Kev xaiv cov khoom siv tsis raug tuaj yeem ua rau lub cev tsis ua haujlwm ntxov, kev siv nyiaj ntau dhau, lossis kev siv nyiaj tsis tsim nyog ua ntej. Ib qho kev sib piv nruj yuav tsum tau tshuaj xyuas lawv cov qauv hauv paus, cov txheej txheem tiv thaiv, thiab kev lag luam profile kom ntseeg tau tias kev sib raug zoo nrog qhov project specifications.

 

Core txhais thiab muaj pes tsawg leeg

Thawj qhov sib txawv yog nyob ntawm seb txhua yam khoom siv li cas. Stainless hlau yog ib qho tseeb alloy, txhais tau tias nws corrosion- cov khoom tiv thaiv tau muab faib ua ib yam thoob plaws hauv nws qhov ntim tag nrho. Los ntawm kev txhais, stainless hlau yuav tsum muaj tsawg kawg yog 10.5% chromium los ntawm huab hwm coj. High- qib kev ua tau zoo feem ntau siv hauv kev lag luam, xws li 304 thiab 316, kuj tseem suav nrog feem pua ​​​​ntawm cov npib tsib xee thiab molybdenum los txhim kho cov khoom siv tshwj xeeb thiab tshuaj lom neeg. Vim tias qhov kev tiv thaiv no tau koom ua ke rau hauv cov hlau nws tus kheej, cov khoom tseem muaj tshuaj lom neeg zoo ib yam los ntawm qhov chaw mus rau qhov tseem ceeb.

Hloov pauv, galvanized steel yog cov qauv carbon steel uas tau kho nrog kev tiv thaiv saum npoo ntawm zinc. Cov txheej txheem kev lag luam feem ntau rau kev ua tiav qhov no yog kub -dip galvanizing, uas submerged cov hlau liab qab nyob rau hauv ib da dej ntawm molten zinc ntawm roughly 450℃(842℃F) los ua ib tug nruj bonded metallurgical alloy txheej. Tus qauv G90 galvanized txheej muab 0.90 ounces ntawm zinc ib square feet ntawm qhov chaw, txhais mus rau ib tug tuab ntawm kwv yees li 1.53 mils ib sab. Xwb, electrogalvanizing siv cov txheej txheej zinc txheej nyias dua, zoo dua siv cov hluav taws xob tam sim no, txawm hais tias nws yog feem ntau tshwj tseg rau cov ntawv thov sab hauv tsev uas xav tau hnyav dua - lub luag haujlwm tiv thaiv.

 

Yuav ua li cas rau kev sib piv

Txhawm rau tsim qhov kev sib piv, cov kws tshaj lij hauv kev lag luam yuav tsum saib cov hlau tsis muaj steel uas muab cov khoom siv hauv tsev, alloy- qib kev tiv thaiv, thaum galvanized steel muab extrinsic, barrier - qib kev tiv thaiv. Yog hais tias stainless hlau raug khawb, machined, los yog txiav, cov hlau tshiab tam sim ntawd reacts nrog ambient oxygen los tsim ib tug tshiab microscopic chromium oxide txheej. Qhov no tus kheej tsis tu ncua- kho tus yam ntxwv yog tshwj xeeb rau cov hlau.

Yog hais tias galvanized steel txhawb nqa ib tug tob gouge nkag mus rau hauv zinc txheej, lub hauv paus cov pa roj carbon steel raug nthuav tawm thiab dhau los ua qhov yooj yim rau oxidation. Cov zinc nyob ib puag ncig yuav muab kev tiv thaiv hauv cheeb tsam rau lub sijhawm txwv, kos cov ntsiab lus corrosive kom deb ntawm cov hlau, tab sis qhov thaiv yog qhov cuam tshuam. Qhov sib txawv ntawm qhov kev tiv thaiv no ua rau muaj kev sib txawv ntawm kev lag luam ntawm ob cov ntaub ntawv. Tsav los ntawm cov khoom lag luam siab ntawm chromium thiab npib tsib xee, kev lag luam stainless hlau feem ntau hais kom tus nqi ntawm plaub mus rau tsib npaug ntawm cov khoom siv ua ntej ntawm cov khoom siv galvanized.

 

Qhov tseem ceeb ntawm kev ua tau zoo sib txawv

Lub divergent manufacturing txheej txheem ntawm stainless thiab galvanized steel manifest nyob rau hauv drastically txawv teb kev ntsuas metrics. Kev ntsuam xyuas cov ntaub ntawv no rau kev xa mus rau kev lag luam yuav tsum tau saib xyuas lawv lub neej ntev, kev ua haujlwm ruaj khov nyob rau hauv kev ntxhov siab, thiab thermal tolerances nyob rau hauv ib puag ncig huab.

 

Corrosion kuj, lub zog, thiab kev txij nkawm

Kev tiv thaiv corrosion thiab kev tu lub sijhawm ntev - yog thawj qhov kev sib ntaus sib tua rau ob lub hlau no. Cov hlau tsis muaj steel siv nws cov yeeb yaj kiab chromium oxide passive los ua nws tus kheej zoo tiv thaiv tus qauv atmospheric corrosion, uas ua rau ze rau - xoom txij nkawm ntawm nws lub neej. Galvanized steel cia siab rau tag nrho cov zinc txheej ua raws li kev txi anode, lub ntsiab lus zinc corrodes nyiam los tiv thaiv lub hauv paus hlau. Hauv cov cheeb tsam me me nyob deb nroog, tus qauv kub-dip zinc txheej tuaj yeem kav li 50 txog 70 xyoo ua ntej cov hlau pib xeb. Txawm li cas los xij, nyob rau hauv cov cheeb tsam muaj kuab paug siab nrog cov qib sulfur dioxide siab, qhov kev ua neej no tuaj yeem poob qis dua 20 xyoo.

Structurely, stainless hlau alloys feem ntau muab superior txhua yam khoom. Piv txwv li, Qib 304 stainless hlau boasts lub zog tensile ntawm kwv yees li 505 MPa, whereas standard A36 galvanized carbon steel feem ntau plateaus nyob ib ncig ntawm 400 MPa. Tsis tas li ntawd, stainless hlau tuav nws cov qauv kev ncaj ncees ntawm kev ua haujlwm tsis tu ncua mus txog 870℃(1598℃F). Hauv qhov sib piv, cov zinc txheej ntawm cov hlau galvanized pib tev, tawg, thiab degrade ntawm qhov kub siab tshaj 200℃(392℃F), ua rau nws tsis tsim nyog rau siab -tshav kub manufacturing puag ncig.

 

Qhov zoo tshaj plaws kev sib piv rooj qauv

Consolidating cov specifications no muab lub moj khaum meej rau kev sib piv cov ntaub ntawv. Cov lus hauv qab no qhia txog qhov tseem ceeb ntawm kev ua haujlwm sib txawv ntawm cov qauv kev lag luam qib ntawm ob qho khoom siv, pab pawg neeg muag khoom hauv kev ntsuas cov peev txheej hauv paus.

Specification	Stainless hlau (Qib 304)	Galvanized hlau (G90)
Mechanism tiv thaiv	Intrinsic (Chromium Oxide)	Extrinsic (Sacrificial Zinc)
Tensile zog	~ 505 MPa	~ 400 MPa (Base Steel Dep.)
Max ua haujlwm Temp	870℃(1598℃F)	200℃(392℃F)
Tus kheej -Kev Muaj Peev Xwm Zoo	Yog (Infinite ntawm Oxidation)	Limited (Txog rau Zinc Depletes)
Tus nqi ntawm cov khoom siv txheeb ze	Siab (4x - 5x Base)	Tsawg (1.2x - 1.5x Base)
Kev Kho Kom Zoo	Tsawg kawg	Nruab nrab (Kov-yuav tsum tau nce)

 

Yuav Ua Li Cas Xaiv Cov Khoom Zoo

Lub tswv yim kev yuav khoom xav tau qhov kev ntsuam xyuas nruj ntawm qhov chaw thov tshwj xeeb, kev cia siab txog tus nqi ntawm lub neej, thiab kev tsim khoom. Xaiv cov hlau zoo tshaj plaws tsis tshua muaj teeb meem ntawm kev nrhiav cov khoom siv zoo tshaj plaws tab sis txheeb xyuas tus nqi tshaj plaws - cov kev daws teeb meem zoo uas ntseeg tau raws li cov txheej txheem engineering.

 

Cov kauj ruam kev txiav txim siab

Thawj kauj ruam ntawm kev txiav txim siab yog kev ntsuam xyuas ib puag ncig. Yog tias daim ntawv thov cuam tshuam txuas ntxiv mus rau thaj chaw hauv hiav txwv, de-cov ntsev ntsev, lossis cov tshuaj siv tshuaj hnyav, galvanized steel feem ntau tsis tsim nyog. Zinc coatings degrade sai nyob rau hauv ib puag ncig nrog cov tshuaj chloride siab lossis qhov chaw pH ambient poob qis dua 6.0 lossis tshaj 12.5. Nyob rau hauv xws li mob, 316 stainless hlau, fortified nrog 2% mus rau 3% molybdenum, yog qhov yuav tsum tau engineering qauv los tiv thaiv pitting thiab crevice corrosion.

Cov kauj ruam thib ob suav nrog suav nrog Tus Nqi Tag Nrho Cov Tswv Cuab (TCO).

 

Ntsiab Cai

Qhov tseem ceeb tshaj plaws cov lus xaus thiab lub laj thawj rau qhov sib txawv ntawm stainless hlau thiab galvanized

Cov kev qhia tshwj xeeb, kev ua raws cai, thiab kev pheej hmoo kuaj xyuas tsim nyog ua ntej koj cog lus

Cov kauj ruam tom ntej no thiab cov lus ceeb toom cov neeg nyeem tuaj yeem siv tam sim ntawd

 

Cov lus nug nquag

Dab tsi yog qhov txawv ntawm stainless hlau thiab galvanized hlau?

Stainless hlau yog ib qho corrosion-resistant alloy thoob plaws hauv cov hlau, thaum galvanized steel yog carbon hlau tiv thaiv los ntawm zinc txheej rau saum npoo.

Qhov twg nyob sab nraum zoov ntev dua?

Stainless hlau feem ntau kav ntev dua nrog kev saib xyuas tsawg dua. Galvanized steel tuaj yeem ua tau zoo sab nraum zoov, tab sis txheej txheej lub neej nyob ntawm ib puag ncig thiab kev puas tsuaj rau zinc txheej.

Puas yog stainless hlau muaj zog dua galvanized steel?

Hauv ntau qib sib xws, yog. Piv txwv li, 304 stainless feem ntau muaj zog tensile ntau dua li cov qauv galvanized carbon steel siv rau kev siv cov qauv siv.

Dab tsi yog qhov zoo dua rau kev siv siab -kub?

Stainless hlau. Galvanized coatings tuaj yeem degrade saum toj no txog 200 degree, thaum ntau qib stainless tuav kev ua haujlwm ntawm qhov kub thiab txias ntau dua.

Vim li cas stainless hlau kim dua galvanized hlau?

Nws cov ntsiab lus alloying, tshwj xeeb tshaj yog chromium thiab feem ntau nickel lossis molybdenum, nce nqi khoom. Koj them nyiaj ntau dua ua ntej tab sis feem ntau txo cov nqi kho thiab hloov pauv.