Xaiv txoj cai stainless hlau yeeb nkab yog ib qho tseem ceeb los xyuas kom meej durability, corrosion kuj thiab kev ua tau zoo nyob rau hauv industrial daim ntaub ntawv. 304, 304L thiab 304H stainless hlau kav yog tag nrho cov austenitic stainless hlau, tab sis lawv cov ntsiab lus carbon thiab mechanical zog ua rau lawv haum rau txawv ib puag ncig.
Cov lus qhia no yuav pab koj nkag siab txog qhov sib txawv, kev siv thiab qhov zoo ntawm txhua qib, tso cai rau koj los txiav txim siab kev yuav khoom rau kev lag luam tshuaj, khoom noj, tshuaj thiab kev tsim kho.
Dab tsi yog qhov zoo ntawm 304 stainless hlau?
304 stainless hlau, tseem hu ua A2 stainless hlau, yog cov feem ntau siv austenitic stainless hlau. Nws muaj 18-20% chromium thiab 8-10.5% npib tsib xee, pom zoo corrosion kuj, formability thiab mechanical zog. Nws yog feem ntau siv rau hauv cov khoom siv hauv chav ua noj, cov thawv ntim tshuaj, thiab kev tsim kho.
Dab tsi yog 304L khoom?
304L stainless hlau yog cov pa roj carbon tsawg ntawm 304. Cov "L" sawv cev rau "tsawg carbon", uas txhais tau hais tias nws cov ntsiab lus carbon feem ntau yog 0.03%, thaum tus qauv 304 muaj cov ntsiab lus carbon ntawm 0.08%. Cov ntsiab lus qis carbon tsawg txo qhov kev pheej hmoo ntawm carbide nag lossis daus thaum lub sijhawm vuam, txhim kho nws cov kev tiv thaiv rau intergranular corrosion. Yog li ntawd, 304L yog qhov zoo tagnrho rau cov ntawv thov uas yuav tsum tau siv dav dav, xws li cov khoom siv tshuaj thiab petrochemical industries.
Dab tsi yog 304H stainless hlau siv rau?
304H stainless hlau yog cov pa roj carbon ntau ntawm qib 304, tshwj xeeb yog tsim los rau kev kub siab zog thiab nkag siab, ua rau nws zoo tagnrho rau cov hlab ntsha siab, boilers thiab kub exchangers qhov twg tus qauv 304 yuav ua tsis tau. Nws cov ntsiab lus carbon ntau dua (0.04-0.1%) nce tensile lub zog thiab elastic txwv ntawm qhov kub thiab txias, tso cai rau kev ruaj ntseg ntawm cov txheej txheem siab tshaj 500 degrees (932 degrees F).
Cov ntsiab lus ntawm 304, 304L thiab 304H Stainless hlau kav
|
Qib |
UNS No. |
Cov ntsiab lus carbon |
Ntsiab nta |
|---|---|---|---|
|
304cov |
S30400 |
Tsawg dua lossis sib npaug li 0.08% |
Standard austenitic stainless hlau, zoo heev corrosion kuj, dav lub hom phiaj tubing |
|
304l uacov |
S30403 |
Tsawg dua lossis sib npaug li 0.03% |
Tsawg carbon version, optimized rau vuam, tiv thaiv carbide nag lossis daus |
|
3 04hcov |
S30409 |
0.04 - 0.10% |
High carbon version, ntau dua ua haujlwm rau qhov kub thiab txias |
Dab tsi yog qhov txawv ntawm 304, 304L thiab 304H?
Qhov sib txawv tseem ceeb yog cov ntsiab lus carbon. 304L yog cov pa roj carbon tsawg los tiv thaiv intergranular corrosion thaum vuam. 304H muaj cov pa roj carbon ntau los muab kev kub ntxhov ntxiv. 304 yog lub hom phiaj dav dav stainless hlau.
304 Stainless Steel Pipes vs . 304L vs . 304H: Tshuaj muaj pes tsawg leeg
|
Element |
304 |
304l ua |
3 04h |
|---|---|---|---|
|
Cov pa roj carbon (C) |
Tsawg dua lossis sib npaug li 0.08 |
Tsawg dua lossis sib npaug li 0.03 |
0.04-0.10 Nws |
|
Chromium (Cr) |
18 - 20% |
18 - 20% |
18 - 20% |
|
Nickel (Ni) |
8-10.5% yog ' |
8-10.5% yog ' |
8-10.5% yog ' |
|
Manganese (Mn) |
Tsawg dua lossis sib npaug li 2% |
Tsawg dua lossis sib npaug li 2% |
Tsawg dua lossis sib npaug li 2% |
|
Silicon (Yog) |
Tsawg dua lossis sib npaug li 1% |
Tsawg dua lossis sib npaug li 1% |
Tsawg dua lossis sib npaug li 1% |
|
Phosphorus (P) |
Tsawg dua lossis sib npaug li 0.045% |
Tsawg dua lossis sib npaug li 0.045% |
Tsawg dua lossis sib npaug li 0.045% |
|
Sulfur (S) |
Tsawg dua lossis sib npaug li 0.03% |
Tsawg dua lossis sib npaug li 0.03% |
Tsawg dua lossis sib npaug li 0.03% |
|
Nitrogen (N) |
Tsawg dua lossis sib npaug li 0.11% |
Tsawg dua lossis sib npaug li 0.11% |
Tsawg dua lossis sib npaug li 0.11% |
304 Stainless Steel Pipes vs . 304L vs . 304H: Mechanical Properties
|
Khoom |
304 |
304l ua |
3 04h |
|---|---|---|---|
|
Tensile zog |
500-700MPa |
485-690MPa |
515-720 MPa |
|
Elastic txwv |
205 MPa |
205 MPa |
215 MPa |
|
Elongation |
Ntau dua lossis sib npaug li 40% |
Ntau dua lossis sib npaug li 40% |
Ntau dua lossis sib npaug li 40% |
|
Hardness |
70-95 IB |
70-90 IB |
70-95 IB |
|
Qhov Kev Pab Cuam Siab Tshaj Plaws |
870 degree |
870 degree |
900 degrees |
304 Stainless Steel Pipes vs . 304L vs . 304H: Daim ntawv thov
Qhov kev xaiv ntawm qib nyob ntawm qhov tseem ceeb ntawm seb daim ntawv thov puas cuam tshuam nrog vuam lossis kub kub.
|
Daim ntawv thov |
304 |
304l ua |
3 04h |
Pom zoo siv |
|---|---|---|---|---|
|
Cov kav dej tshuaj |
✅ |
✅ |
⚪ |
304L yog qhov zoo dua yog tias xav tau kev vuam dav |
|
Cov kav dej thiab dej haus |
✅ |
✅ |
⚪ |
304 lossis 304L rau cov kav dej huv |
|
Kev lag luam kws tshuaj |
✅ |
✅ |
⚪ |
304L yog qhov zoo rau cov tshuab welded |
|
High Temperature Heat Exchangers |
⚪ |
⚪ |
✅ |
304H yog qhov zoo tagnrho rau kev pabcuam kub siab |
|
Marine Pipes |
✅ |
✅ |
⚪ |
304L yog pom zoo rau welded marine lug |
|
Boilers thiab Presses Vessels |
✅ |
✅ |
✅ |
304H yog qhov zoo dua rau kev pabcuam kub siab |
304 vs . 304L vs . 304H: Corrosion Resistance
Qhov yooj yim corrosion kuj ntawm 304, 304L thiab 304H yog qhov tseem ceeb zoo ib yam vim tias lawv txhua tus muaj cov ntsiab lus zoo ib yam ntawm chromium (18-20%) thiab npib tsib xee (8-10.5%), nthuav tawm zoo corrosion kuj nyob rau hauv cov huab cua, dej tshiab thiab feem ntau tsis muaj zog corrosive xov xwm.
Lub ntsiab sib txawv nyob rau hauv qhov kev pheej hmoo ntawm intergranular corrosion tom qab vuam: 304L, nrog cov ntsiab lus carbon tsawg dua los yog sib npaug rau 0.03%, txo qhov tshwm sim ntawm Cr₂₃C₆ carbides precipitating nyob rau hauv lub rhiab heev kub ntau yam ntawm 450-850 degrees, tswj zoo corrosion tsis kam; thaum 304 (C Tsawg dua lossis sib npaug li 0.08%) thiab 304H (C 0.04–0.10%) qhia tau tias muaj kev cuam tshuam ntau dua rau kev cuam tshuam ntawm intergranular corrosion tshaj 304L tom qab vuam lossis raug kub tsis muaj kev kho cua sov txaus. Raws li ASTM A262 cov qhabnias xeem, 304L feem ntau yuav dhau txoj kev E lossis C kev xeem hauv lub xeev as-welded.
Cov lus nug uas nquag nug
Q: Dab tsi qib yog qhov zoo tshaj plaws rau welded yeeb nkab?
A: 304L stainless hlau yog pom zoo rau welded yeeb nkab vim nws cov ntsiab lus carbon tsawg, uas txo qhov kev pheej hmoo ntawm corrosion hauv welds.
Q: Qib twg yog qhov tsim nyog rau kev siv kub kub?
A: 304H stainless hlau yog tsim los rau cov kev pab cuam kub kub, xws li nyob rau hauv tshav kub exchangers, boilers, thiab siab hlab ntsha.
Q: Tag nrho peb qib puas tuaj yeem siv rau hauv ib puag ncig marine?
A: Yog, tag nrho peb qhov muaj kev tiv thaiv corrosion zoo heev. Rau cov qauv welded hauv dej ntsev, 304L yog nyiam.
