1.4521 Stainless hlau yog dab tsi?

1.4521 stainless hlau, feem ntau hu ua 444 lossis UNS S44400, yog molybdenum- alloyed ferritic stainless hlau nrog zoo corrosion kuj, tshwj xeeb tshaj yog tiv thaiv chloride-induced pitting thiab crevice corrosion. Nws ntxiv ntawm molybdenum thiab titanium stabilization muab kev ua tau zoo mus txog ntawm 316L austenitic stainless hlau nyob rau hauv ntau qhov chaw, thaum tswj tus nqi qis thiab cov khoom zoo ntawm cov qib ferritic. Nws yog dav siv nyob rau hauv cov dej tso cua sov, tshav kub exchangers, thiab cov khoom ua zaub mov.

 

Qhov siab - qib ferritic kev ua tau zoo no yog tus qauv raws li cov txheej txheem thoob ntiaj teb tseem ceeb.

Txuj	Qib sib npaug
EN (Tebchaws Europe)	1.4521
ASTM / AISI (USA)	444, UA S44400
JIS (Nyiv)	SUS 444
KS (Korea)	STS 444

Nws muaj xws li molybdenum rau txhim kho corrosion kuj thiab titanium / niobium rau stabilization.

Lub ntsiab	C	Si	Mn	P	S	Cr	Mo	Ti + Nb
Cov ntsiab lus (%)	Tsawg dua lossis sib npaug li 0.025	Tsawg dua los yog sib npaug rau 1.0	Tsawg dua los yog sib npaug rau 1.0	Tsawg dua lossis sib npaug li 0.04	Tsawg dua los yog sib npaug li 0.03	17.5 - 19.5	1.75 - 2.5	Ntau dua lossis sib npaug rau 0.20+4(C+N)

Nws muaj cov khoom zoo txhua yam ua ke nrog kev ua haujlwm zoo corrosion.

Khoom	Yield zog (Rp0.2)	Tensile zog (Rm)	Elongation (A)	Hardness (HB)
Tus nqi	Ntau tshaj lossis sib npaug li 280 MPa	420 - 640 MPa	Ntau dua lossis sib npaug li 20%	Tsawg dua los yog sib npaug li 200

 

Cov yam ntxwv tseem ceeb thiab kev siv ntawm 1.4521 / 444

Zoo heev Chloride Resistance:Qhov sib ntxiv ntawm molybdenum muab qhov ua tau zoo dua rau pitting thiab crevice corrosion hauv chloride - muaj ib puag ncig ntau dua li cov qib ferritic, mus txog ntawm 316L.

Stress Corrosion Cracking Resistance:Ua ferritic, nws muaj qhov tsis kam tiv thaiv chloride kev nyuaj siab corrosion cracking, uas tuaj yeem cuam tshuam rau qib austenitic xws li 304 thiab 316.

Stabilized Structure:Titanium thiab niobium stabilization tiv thaiv rhiab heev thaum vuam, tswj corrosion kuj nyob rau hauv welded cheeb tsam.

Tsawg Thermal Expansion:Tsawg coefficient ntawm thermal expansion dua li qib austenitic, zoo rau kev siv nrog thermal cycling.

 

Cov ntawv thov tseem ceeb:

Dej rhaub:Cov tso tsheb hlau luam, cov kav hluav taws xob hloov hluav taws xob, thiab cov kav dej hauv cov kav dej hauv tsev thiab kev lag luam.

Thaum tshav kub kub Exchangers:Tubing rau cua sov rov qab systems, hnub ci dej rhaub, thiab industrial tshav kub exchangers.

Kev ua zaub mov:Cov khoom siv los tuav cov khoom noj uas muaj cov ntsiab lus chloride tsawg.

Brewing thiab dej haus:Tank thiab piping rau npias, cawv, thiab dej qab zib ua.

Architectural:Ru tsev, cladding, thiab gutters nyob rau hauv ntug hiav txwv dej los yog industrial cheeb tsam.

Automotive:Exhaust Cheebtsam yuav tsum muaj corrosion kuj ntau dua 409/439.

 

444 (1.4521) piv rau 316L (1.4404) stainless hlau li cas?
444 muaj corrosion kuj piv rau 316L nyob rau hauv ntau qhov chaw, tshwj xeeb tshaj yog tiv thaiv chloride pitting thiab dav corrosion, thaum muab superior tsis kam rau chloride kev nyuaj siab corrosion cracking. Nws muaj thermal conductivity ntau dua, qis dua thermal expansion, thiab yog sib nqus, qhov 316L tsis yog -magnetic{5}} feem ntau yog tus nqi ntau dua - ruaj khov vim nws cov ntsiab lus nickel qis (tsis muaj nickel ntxiv). Txawm li cas los xij, 316L muaj kev tsim tau zoo dua, muaj zog dua ntawm qhov kub thiab txias, thiab zoo dua weldability rau cov ntaub ntawv nyuaj. 444 feem ntau yog xaiv raws li tus nqi- siv tau zoo dua rau 316L rau cov ntawv thov xws li dej rhaub dej thiab cov khoom siv hluav taws xob uas nws cov khoom siv tau zoo - haum.

 

Dab tsi yog qhov kev txiav txim siab vuam rau 444 stainless hlau?
444 muaj qhov zoo weldability vim nws ruaj khov nrog titanium thiab niobium. Cov tswv yim siv hluav taws xob qis qis tau pom zoo kom txo qis kev loj hlob ntawm cov qoob loo hauv tshav kub - cuam tshuam cheeb tsam. Cov hlau sib xyaw ua ke muaj, txawm hais tias austenitic fillers zoo li 309L lossis 316L feem ntau siv rau qhov sib txawv. Preheating feem ntau tsis tas yuav tsum tau ua, tab sis tom qab -vuam tu yog qhov tseem ceeb los kho qhov corrosion. Qhov ruaj khov muaj pes tsawg leeg tiv thaiv rhiab heev, yog li tom qab -weld kev kho cua sov tsis tsim nyog rau kev tiv thaiv corrosion. Rau qhov zoo tshaj plaws corrosion kev ua tau zoo nyob rau hauv ib puag ncig hnyav, kev txiav txim siab yuav tsum tau muab rau cov khoom siv hlau xaiv kom phim lossis tshaj lub hauv paus hlau qhov corrosion kuj.

 

Nrhiav kev ntseeg siab ntawm 1.4521 / 444 Stainless Hlau?
GNEE Steel muab cov khoom siv siab -kev ua tau zoo 444 (1.4521) stainless hlau hauv cov ntawv, coil, phaj, raj, thiab cov ntaub ntawv strip, zoo tagnrho rau cov dej rhaub dej, cov khoom siv hluav taws xob, thiab cov ntawv ua zaub mov. Peb muab cov ntaub ntawv pov thawj tag nrho (EN 10204 3.1) thiab kev txhawb nqa suav nrog kev txiav, khoov, thiab kev pabcuam vuam. Yog tias koj muaj kev xav tau, thov koj xav tiv tauj peb.