1.4521 Stainless hlau yog dab tsi?

1.4521 stainless hlau, feem ntau hu ua 444 los yog UNS S44400, yog molybdenum-alloyed ferritic stainless hlau uas muaj corrosion kuj zoo heev, tshwj xeeb tshaj yog tiv thaiv chloride-induced pitting thiab crevice corrosion. Nws ntxiv ntawm molybdenum thiab titanium / niobium 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. Qhov no ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov dej rhaub dej, cov khoom siv hluav taws xob, thiab cov khoom siv ua zaub mov uas muaj kev tiv thaiv corrosion thiab kev lag luam tseem ceeb.

 

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 tiv thaiv rhiab heev.

Element	C	Si	Mn	P	S	Cr	Mo	Ti + Nb
Cov ntsiab lus (%)	≤ 0.025	≤ 1.0	≤ 1.0	≤ 0.04	≤ 0.03	17.5 - 19.5	1.75 - 2.5	≥ 0.20+4(C + N)

Nws muaj cov khoom zoo txhua yam ua ke nrog kev txhim kho corrosion zoo heev.

Khoom	Yield zog (Rp0.2)	Tensile zog (Rm)	Elongation (A)	Hardness (HB)
Tus nqi	≥280 MPa	420 - 640 MPa	≥ 20%	≤ 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 austenitic stainless hlau.

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

Stabilized Structure:Titanium thiab niobium stabilization tiv thaiv rhiab heev thaum vuam, tswj kev tiv thaiv corrosion nyob rau hauv qhov chaw welded yam tsis tas yuav tsum tau post-weld heat treatment.

Tsawg Thermal Expansion:Tsawg coefficient ntawm thermal expansion dua li qib austenitic (kwv yees li 30% tsawg), muaj txiaj ntsig zoo rau kev siv nrog thermal cycling thiab koom nrog carbon steel.

 

Cov ntawv thov tseem ceeb:

Lub tshuab rhaub dej:Cov tso tsheb hlau luam, cov kav dej kub hloov pauv, cov kav dej flue, thiab cov khoom siv sab hauv hauv cov tsev nyob thiab cov khoom siv hluav taws xob.

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

Kev ua zaub mov:Cov khoom siv rau kev tuav cov khoom noj uas muaj cov ntsiab lus chloride nruab nrab, brewing tanks, thiab cov khoom siv ua cawv.

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

Automotive:Exhaust Cheebtsam uas yuav tsum tau corrosion kuj siab dua 409/439, tshwj xeeb tshaj yog nyob rau hauv cov cheeb tsam uas siv txoj kev de-icing ntsev.

Hluav taws xob Enclosures:Txee thiab enclosures nyob rau hauv ntug hiav txwv dej los yog industrial ib puag ncig.

 

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 cov thermal conductivity ntau dua (kwv yees li 25% siab dua), qis thermal expansion (kwv yees li 30% qis), thiab yog hlau nplaum, whereas 316L tsis yog -sib nqus. 444 feem ntau yog tus nqi ntau dua- ruaj khov vim nws cov ntsiab lus qis nickel (tsis muaj npib tsib xee ntxiv), zam nickel nqi volatility. 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 cov dej rhaub dej thiab cov khoom siv hluav taws xob uas nws cov khoom siv tau zoo- haum thiab cov nqi txuag tseem ceeb.

 

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, uas tiv thaiv chromium carbide nag lossis daus thiab rhiab heev. 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 - thaj tsam cuam tshuam. Muab cov hlau sib xyaw ua ke muaj (piv txwv li, ER444), txawm hais tias austenitic fillers zoo li 309L lossis 316L feem ntau siv rau qhov sib txawv ntawm cov welds rau carbon steel lossis rau kev txhim kho weld pas dej fluidity. Preheating feem ntau tsis tas yuav tsum tau ua, tab sis tom qab-vuam tu yog qhov tseem ceeb los ua kom muaj kev tiv thaiv 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, vuam, thiab cov kev pabcuam nto tiav. Yog tias koj muaj kev xav tau, thov koj xav tiv tauj peb.