Tshwj xeeb Engineering Insight: Raws li peb re-cov ntaub ntawv tshuaj xyuas los ntawm 137 duplex steel tej yaam num nyob rau tsib xyoos dhau los,Tshaj 30% ntawm cov teeb meem engineering pib los ntawm kev tsis meej pem S31803 thiab S32205 thaum xaiv cov khoom. Kab lus no yuav qhia meej meej txog qhov sib txawv tseem ceeb ntawm ob cov ntaub ntawv no, txhawb koj kom txiav txim siab "tsis muaj- tu siab" kev txiav txim yuav khoom.
Qhov txawv ntawm S31803 thiab S32205 yog dab tsi?
Ua ntej dhia mus rau hauv kev paub meej, cia peb tsim kom muaj kev nkag siab zoo los ntawm lub rooj sib piv. Ib lo lus nug uas peb tau txais los ntawm cov neeg siv khoom yog:
| Dimension ntawm kev sib piv | UNS S31803 | UNS S32205 | BaoHui Steel Kev txhais lus |
|---|---|---|---|
| Chemical Composition (Qhov txawv tseem ceeb) | Cr: 21.0-23.0% Mov: 2.5-3.5% N: 0.08-0.20% |
Cr: 22.0-23.0% Mov: 3.0-3.5% N: 0.14-0.20% |
S32205 ua tiav nce qhov tsawg kawg nkaus txwv. Qhov nce hauv qhov tsawg kawg nkaus nitrogen cov ntsiab lus los ntawm 0.08% mus rau 0.14% yog qhov tseem ceeb rau kev ua kom muaj kev sib txuas. |
| Pitting Resistance Equivalent Number (PREN) | 30-36 (Wide fluctuation ua tau) | Ntau dua lossis sib npaug rau 35 (Guaranteed stability) | Rau txhua txhua 1-point nce hauv PREN, Critical Pitting Temperature (CPT) feem ntau nce 3-5℃. |
| Raws li -Welded Properties | Thaum nitrogen nyob rau qis qis, chromium nitrides tuaj yeem ua rau hauv HAZ, ua rau txo cov tawv nqaij. | Cov nitrogen ntau dua ua kom muaj kev hloov pauv ntawm austenite txaus hauv thaj chaw weld, ua rau cov khoom ruaj khov. | Qhov no yog qhov laj thawj tseem ceeb S32205 tau tsim. |
| ASTM Txuj Taw Qhia | Ib txwm qib, tseem ceeb ua ntej ~ 2000. | Qib raws li txoj cai los ntawm ASTM rau 2205 tom qab-2000. | ASTM redefined 2205 nrog S32205, imposing stricter cov cai. |
| Dual{0}} Muaj peev xwm ua pov thawj | Tsis tuaj yeem thim rov qab- ntawv pov thawj raws li S32205. | Muaj peev xwm ua tau raws li qhov yuav tsum tau ua rau S31803 thiab S32205. | BaoHui Steel pom zoo: qhia meej tias yuav tsum tau "Ua rau S32205 + Dual Certification" hauv koj qhov kev qhia tshwj xeeb. |
| Tej kev siv | General corrosive ib puag ncig, tsis yog - cov khoom tseem ceeb. | Ib puag ncig corrosive hnyav (muaj chlorides, kub / siab, dynamic loads). | Qhov kev xaiv nyob ntawm qhovkev nyab xeeb tsis tau pom duaxav tau los ntawm cov kev ua haujlwm. |
| Tus nqi sib txawv | Lub hauv paus | Kwv yees li ntawm . 3-5% premium (vim cov ntsiab lus alloy siab dua me ntsis) | Kev nqis peev<3% additional cost for >30% kev txhim kho hauv kev tiv thaiv corrosion kev nyab xeeb margin. |
Puas yog S31803 duplex?
Lo lus teb yog: Yog. S31803yog thawj zaug - tiam duplex stainless hlau, Ameslikas tsim nyob rau hauv 1930s rau kev lag luam pulp thiab ntawv. Nws microstructure muajkwv yees li 50% austenite thiab 50% ferrite. Qhov no dual -theem qauv muab lub zog tawm los kwv yees li ob zaug ntawm cov khoom siv austenitic stainless hlau (xws li 316L). Txawm li cas los xij, nws txoj kev sib raug zoo nrog S32205 yog qhov nkag siab zoo tshaj plaws raws li kev hloov pauv los ntawm "cov qauv hauv paus" mus rau "txhim kho version."
Technical Depth: Los ntawm Microstructure mus rau "Vim li cas S32205 yog qhov tseeb 2205."
2.1 Ib qho Overlooked Metallurgical Fact
Ntau tus tsis paub txog qhov ntawdS31803 yeej tsis tau txhais los ntawm ASTM ua tus qauv kawg rau "2205."
Qhov tseeb, ua ntej xyoo 2000, qib 2205 duplex stainless hlau feem ntau tau txheeb xyuas los ntawmUNS S31803. Txawm li cas los xij, nrog kev saws dav dav ntawm AOD (Argon Oxygen Decarburization) refining thev naus laus zis, mills tau txais lub peev xwm los tswj cov ntsiab lus ntawm alloying ntawm cov kev txwv sab saud. Kev paub txog kev coj ua tau pom tias:Cov ntaub ntawv tsim los rau qis qis ntawm S31803 muaj pes tsawg leeg (tshwj xeeb tshaj yog nrog nitrogen tsawg li 0.08%) pom cov khoom degraded loj tom qab vuam.
S31803 cov khoom sib npaug yog dab tsi?
Cov npe sib npaug thoob ntiaj teb rau S31803 suav nrog:
DIN / EN Txuj: 1.4462
Japanese JIS TxujQauv: SUS329J3L
ASTM TxujTom ntej: A182 F51 (rau forging)
Rau S32205, tus qauv tsim rau forgings yog A182 F60. Nws yog noteworthy tiasNippon Yakin Kogyo qhia meej meej nws qib NAS329J3L ua tau raws li qhov yuav tsum tau ua rau UNS S31803 thiab UNS S32205, qhia tias cov neeg ua haujlwm siab tshaj plaws tau hloov pauv lawv cov qauv tsim khoom kom tau raws li S32205 cov kev cai nruj dua.
2.2 Kev sib piv Vuam: Qhov txawv ntawm 0.12% N thiab 0.18% N
Classic metallographic kev tshawb fawb qhia txog qhov tseem ceeb ntawm nitrogen:
Tsawg-Nitrogen (0.12%) S31803 Weldment: Solidification ua rau coarse ferrite nplej. Thaum lub caij txias, kev hloov pauv austenite tsis txaus, ua rau chromium nitride nag lossis daus ntawm cov ciam teb.Qhov tshwm sim: Txo weld toughness thiab txo corrosion kuj.
Siab -Nitrogen (0.18%) S32205 Weldment: Austenite pib tsim nyob rau ntawm qhov kub siab dua, ua kom zoo dua cov pob zeb ferrite qub. Tsis pom muaj nitride nag lossis daus.Qhov tshwm sim: Weld hlau khoom yog ze li zoo tib yam rau lub hauv paus hlau.
Qhov xaus yog qhov tseeb: Yog tias koj qhov project cuam tshuam nrog cov qauv welded, qhia S32205 tsuas yog qhov kev xaiv raug.
2.3 Cov Ntaub Ntawv Tshwj Xeeb: BaoHui Steel's PREN Distribution Analysis ntawm 137 Batches
Kev tshuaj xyuas ntawm cov khoom sib xyaw ua ke re-cov ntaub ntawv tshuaj xyuas los ntawm 137 batch ntawm cov kav dej xaim xaim xaim los ntawm BaoHui Steel nyob rau peb lub xyoos dhau los qhia:
| Qib | Qauv Loj | Nruab nrab PREN | PREN Standard Deviation | Yam tsawg kawg nkaus PREN tus nqi |
|---|---|---|---|---|
| S31803 (Muaj rau tus qauv qub) | 42 | 33.2 | 2.1 | 29.8 |
| S32205 (Yuav tau nruj me ntsis rau tus qauv) | 95 | 36.4 | 0.8 | 34.9 |
S32205 tsis tsuas yog ua tiav qhov nruab nrab siab dua PREN tab sis, qhov tseem ceeb tshaj, cov khoom pov thawjzoo heev khoom sib xws- qhov tseem ceeb tshaj plaws rau kev nyab xeeb hauv kev tsim qauv engineering. Cov ntaub ntawv txuj ci los ntawm ATI lees paub tias lawv cov 2205 alloy ua tiav PREN txog li 35.8.
Dab tsi yog qhov sib npaug rau qib duplex 2205?
Cov npe sib npaug rau Duplex 2205 (seb S31803 lossis S32205) yog:
| Standard System | Lub Npe / Lub Npe |
|---|---|
| UNS (Unified Numbering System) | S31803los yogS32205 |
| EN / DIN (European / German) | 1.4462 |
| JIS (Japanese) | SUS329J3L |
| ASTM (American Society for Testing and Materials) | A240 (Plate), A790 (Tube / Pipe), A182 F51 / F60 (Forgings) |
| Common Industry Name | TIAB SA 2205, 22Cr Duplex |
Tiag -Kev Tshawb Fawb Ntiaj Teb: Tus Nqi ntawm Missteps vs. Qhov khoom plig ntawm Kev Txiav Txim Siab
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Case Study 1: Middle East Seawater Cooling System (Tus nqi ntawm kev xaiv yuam kev)
Keeb kwm: Hauv xyoo 2019, cov nroj tsuag tshuaj tau xaiv S31803 seamless kav (muab mus rau tus qauv qub) rau lub seawater heat exchanger, nrog rau 15 xyoo tsim lub neej.
Ua tsis tiav: Tom qab tsuas yog 14 lub hlis ntawm kev ua haujlwm, ntau lub pitting leaks tshwm sim nyob rau hauv lub raj ntim.
Kev tsom xam: Re-kev tshuaj xyuas qhia qhov tseeb PREN ntawm cov kav dej tsuas yog 31.2, nrog rau cov ntsiab lus nitrogen ntawm 0.09%. Chromium nitride nag lossis daus tau pom nyob rau hauv qhov chaw vuam cua sov- cuam tshuam cheeb tsam. Hauv 60℃chloride- muaj cov dej hiav txwv ib puag ncig, qhov kev tiv thaiv corrosion yog qhov tsis txaus.
Nqi: Downtime poob ntxiv rau cov nqi hloov pauv ntau duaUSD 2 lab.
Zaj lus qhia: Rau cov tshuaj chloride-muaj cov kev pabcuam, S32205 yuav tsum tau teev tseg, yuav tsum muaj daim ntawv pov thawj zeb kuaj (MTR) lav PREN Ntau dua lossis sib npaug rau 35.
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Case Study 2: Northern European Pharmaceutical Plant Clean Steam Piping (Qhov khoom plig ntawm kev xaiv raug)
Keeb kwm: Hauv xyoo 2022, lub chaw biopharmaceutical tshiab yuav tsum muaj cov kav dej uas muaj 25- xyoo kev pab cuam lub neej rau chav huv huv thiab lub sijhawm CIP (Clean-}hauv Chaw) tu (suav nrog hypochlorous acid).
Kev xaiv khoom: Cov kev qhia tshwj xeeb qhia meej yuav tsum tauS32205 duplex stainless hlau, nrog cov kev xav tau ntxiv: cov ntsiab lus nitrogen Ntau dua lossis sib npaug rau 0.16%, thiab PREN Ntau dua lossis sib npaug rau 35.
Cov xwm txheej tam sim no: Kev tshuaj xyuas tom qab 3 xyoos ntawm kev ua haujlwm tsis pom muaj cov tsos mob ntawm corrosion nyob rau hauv cov cheeb tsam weld, thiab cov zaj duab xis passive tseem nyob twj ywm.
Tus nqi: Txawm hais tias tus nqi ntawm cov khoom siv yog kwv yees li 5% siab dua li siv S31803, nws tshem tawm qhov kev pheej hmoo ntawm kev hloov hauv 5 xyoo tom ntej. Tus neeg siv khoom Tus Thawj Coj Zoo tau hais tias: "Qhov no yog tib lub kav dej uas peb tau teeb tsa uas peb tuaj yeem tsis nco qab txog - nws tsuas yog ua tiav."
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Case Study 3: Domestic LNG Terminal Project (Tshaj tawm hauv Loj -Diameter Thin-Wall Pipe)
Ib qhov project loj -LNG davhlau ya nyob twg yuav tsum tau uaφ1016 × 9.53mmloj- txoj kab uas hla, nyias- phab ntsa duplex steel kav rau nws cov dej hiav txwv txias. Thaum lub sij hawm xaiv cov khoom siv, BaoHui Steel tau pom zoo kom qhia txog tus qauv S32205, nrog rau cov hauv qab no ntxiv cov kev cai:
Nitrogen cov ntsiab lus tswj ntawm 0.16-0.18%
PREN Ntau dua lossis sib npaug rau 35.5
ASTM A923 Txoj Kev B cuam tshuam kev kuaj rau txhua qhov cua sov / ntau
Qhov project tau ua tiav tiav raws sijhawm. Tus neeg siv khoom tus thawj tswj hwm tau sau tseg tias: "Muaj qhov tseeb, nruj kev qhia tshwj xeeb tso cai rau peb kom tsis txhob muaj kev pheej hmoo cuam tshuam nrog qis - cov nqi sib tw uas yuav tsis ua tau raws li qhov yuav tsum tau ua tiag tiag."
Kev Ua Zoo Tshaj Plaws: Zam Peb Qhov Tseem Ceeb Rau S32205 Pipes
Raws li BaoHui Steel qhov kev paub txog kev tuav 47 qhov teeb meem tsis sib haum xeeb, ntawm no yog cov lus qhia tseem ceeb kom tsis txhob muaj cuab yeej:
🚫 Pitfall 1: Kev ntseeg kev muag khoom hais tias "S31803 thiab S32205 yog tib yam."
Kev muaj tiag: Thaum zoo sib xws, "zoo ib yam" tsis sib npaug "zoo tib yam," tshwj xeeb tshaj yog hais txog cov khoom siv yam tsawg kawg nkaus.
Cov tswv yim txo qis:
ThovCov ntaub ntawv txheeb xyuas qhov zoo (PMI) cov ntawv xeemlos ntawm tus neeg muag khoom. Siv lub spectrometer los txheeb xyuas Cr, Mo, thiab Ni cov ntsiab lus ntawm cov khoom siv tiag tiag.
Ua tib zoo saib xyuas cov ntsiab lus Nitrogen(Ceeb Toom: PMI spectrometers txheem handheld tsis tuaj yeem ntsuas Nitrogen; kev pov thawj yuav tsum yog los ntawm daim ntawv pov thawj Mill Test Report).
Qhia meej meej xav tau cov khoom uas yogdual{0}} ntawv pov thawj kom ua tau raws li S31803 thiab S32205 cov cai(lub ntsiab lus nws ua tau raws li S32205 chemistry txwv).
🚫 Pitfall 2: Tsis quav ntsej qhov sib xws ntawm "Pall Thickness" nrog "Kev Tsim Khoom."
Rau kev thov siv xws li kev ua tshuaj lom neeg lossis kev pabcuam dej hiav txwv:
Teem rau qhov tsawg kawg nkaus phab ntsa thickness tsawg kawg yog 3 hli. Cov phab ntsa nyias nyias (xws li, qis dua 2.5mm) tej zaum yuav tsis yog- tus qauv lossis tsim los ntawm cov khoom siv rov ua dua tshiab nrog cov khoom tsis zoo.
Xaiv Seamless vs. Welded Yeeb Nkab: Rau siab - kev siv siab, cov yeeb nkab seamless feem ntau nyiam. Rau qhov loj - txoj kab uas hla, qis- cov ntawv siv siab, cov yeeb nkab welded tej zaum yuav siv tau tab sis yuav tsum tau nrog 100% kev kuaj xyuas tsis muaj kev puas tsuaj (NDE), xws li kev ntsuas ultrasonic lossis eddy tam sim no.
Tsis lees txais "Pib" lossis "Txiav-ups": High- cov yeeb nkab zoo yog muab rau hauv qhov ntev yam tsis muaj qhov nruab nrab ntawm qhov sib txuas. Cov khoom sib koom los ntawm qhov luv luv tsim cov ntsiab lus tsis ua haujlwm ntawm cov welds.
🚫 Pitfall 3: Relying on "Experiential" Welding Parameters
Txawm hais tias muaj qhov raug muab los ntawm S32205 yeeb nkab, cov txheej txheem vuam tsis raug yuav cuam tshuam nws qhov zoo:
Thaum tshav kub kub Input Control: Kev pom zoo cua sov yog feem ntau 1.0-2.5 kJ / mm. Tsawg dhau (<0.5 kJ/mm) results in insufficient austenite formation; too high (>2.5 kJ / mm) txaus ntshai nag lossis daus ntawm cov theem teeb meem intermetallic.
Interpass kub: Tswj nruj me ntsis, ua kom qis dua 150 degree. Tsis txhob cuam tshuam ntev rau qhov kub thiab txias ntawm cov weld hla.
Rov qab Purging Gas: Rau cov ntawv thov tseem ceeb, tshwj xeeb tshaj yog rau cov hauv paus hla, siv cov nitrogen-cov kabmob (piv txwv li, 2-5% N₂) rov qab roj tau pom zoo kom them nyiaj rau nitrogen poob hauv cov hlau vuam thiab HAZ.
FAQs (Cov lus nug nquag nug)
Q1: Puas tuaj yeem siv S31803 thiab S32205 sib hloov?
A: Muaj peev xwm nyob rau hauv tsis yog - qhov tseem ceeb, ib puag ncig me me, tab sis nws poob siab heev.
Rau ib puag ncig qhuav, tsis muaj chlorides, tsis muaj dynamic loading, thiab tsis muaj vuam, qhov kev ua tau zoo yuav sib piv. Txawm li cas los xij, rauib daim ntawv thov uas muaj vuam, chloride- muaj cov xov xwm, qaug zog, lossis kev ntxhov siab loj, S32205 yuav tsum tau teev tseg. Raws li cov ntaub ntawv kev kawm ntawm duplex stainless hlau hais tias: "Rau vuam fabrication ntawm 2205 duplex stainless hlau, qhov tsawg kawg nkaus nitrogen cov ntsiab lus ntawm 0.14% yog tsim nyog."
Q2: Ntau npaum li cas kim dua S32205 piv rau S31803? Puas yog tus nqi - zoo?
A: Tus nqi pib ntawm cov khoom siv yog kwv yees li 3-5% siab dua, tab sis tag nrho cov nqi ntawm lub neej feem ntau yog qis dua 30%.
Siv 2025 kev lag luam kwv yees raws li kev siv, S32205 seamless yeeb nkab yuav nyob rau hauv thaj tsam ntawm USD 4,800 - 5,200 ib metric ton, thaum S31803 tej zaum yuav yog USD 4,500 - 4,900 ib metric ton. Txawm li cas los xij, hauv kev pabcuam chloride, qhov kev pheej hmoo ntawm kev ua tsis tiav ntxov nrog S31803 txhais tau tiasrau txhua txhua USD 1,000 txuag ntawm cov khoom siv, koj tuaj yeem tsim kom muaj peev xwm USD 100,000 lav.
Q3: Tus nqi PREN tau txais rau S32205 yog dab tsi?
A: Tus qauv xam yuav tsum tau ntau dua los yog sib npaug rau 35, tab sis BaoHui Steel pom zoo kom qhia ntau tshaj los yog sib npaug rau 36 kom paub tseeb tias kev ua tau zoo.
Tus qauv PREN yog:PREN=%Cr + 3.3 × %Mo + 16 × %N. Kev suav siv S32205 yam tsawg kawg nkaus txwv (22% Cr, 3.0% Mo, 0.14% N) muab 34.6. Txawm li cas los xij, kev paub dhau los tau lees paub tias qhov muaj zog pitting tiv thaiv tiag tiag xav tau PREN Ntau dua lossis sib npaug rau 35. Cov neeg tsim khoom lag luam ATI cov ntaub ntawv tshaj lij tau lees paub lawv cov khoom 2205 cov khoom raug PREN yog 35.8.
Q4: Kuv tuaj yeem txheeb xyuas li cas yog tias cov khoom xa tuaj yog S32205 lossis S31803?
A: Ua raws li peb - cov txheej txheem pov thawj no:
Tshawb xyuas Mill Test Report (MTR): Xyuas kom tseeb tias cov tshuaj muaj pes tsawg leeg ua tau raws li S32205 cov kev cai, ua tib zoo saib xyuasN Ntau dua lossis sib npaug rau 0.14% thiab Mo Ntau dua lossis sib npaug rau 3.0%.
Ua PMI (Positive Material Identification): Siv lub spectrometer ntawm cov khoom tau txais los txheeb xyuas Cr, Mo, thiab Ni. (Ceeb Toom: Nitrogen pov thawj nyob ntawm MTR.
Tshawb xyuas cov cim: Reputable manufacturers yuav lub cev kos cov yeeb nkab nrog "S32205" los yog "2205," tsis yog "S31803."
Q5: Dab tsi yog qhov siab - qhov kev txwv kub rau S32205?
A: Rau lub sijhawm ntev - kev pabcuam txuas ntxiv, qhov kub yuav tsum tsis pub tshaj 280℃; luv- lub sij hawm mus ncig ua si mus txog 300℃tej zaum yuav ua tau, tab sis yuav tsum tau ua tib zoo soj ntsuam.
Kev raug ncua ntev tshaj li 300℃tuaj yeem ua rau nag lossis daus ntawm sigma theem (σ), nkig intermetallic compound, uas ua rau embrittlement thiab poob ntawm corrosion kuj tseem ceeb. Engineering cov txheej txheem (piv txwv li, los ntawm Becht) kuj tseem hais txog qhov yuav tsum tau tswj cov ntsiab lus ntawm weld ferrite thiab xav txog qhov chaw tshwj xeeb (xws li, siab - qhov kub thiab txias kev pab cuam hydrogen) thaum siv duplex stainless hlau.
Lus Nug: Qib twg yog txoj cai rau koj qhov project?
| Hom phiaj | BaoHui Steel Recommended Qib | Kev Ncaj Ncees |
|---|---|---|
| Seawater Cooling Systems | S32205 | Kev tiv thaiv rau chloride pitting yog qhov tseem ceeb. |
| Chemical Pressure Vessels | S32205 | Weldability thiab raws li -welded zog txiav txim siab ntev - lub sij hawm kev nyab xeeb thiab lub neej. |
| Khoom noj khoom haus qib Piping | S31803 / S32205 | Kev ua tau zoo sib piv hauv cov xov xwm benign; xaiv raws li tus nqi thiab muaj. |
| Kev them nyiaj yug tus qauv (sab hauv tsev) | S31803 | Tsis muaj kev pheej hmoo corrosion tseem ceeb; xaiv tus nqi -kev xaiv zoo. |
| Roj & Gas Downhole Tubing | S32205 | Yuav tsum muaj PREN siab los tiv thaiv H₂S thiab chloride corrosion. |
| Kub Exchanger Tube Bundles | S32205 | Xav tau ob qho tib si hloov tshav kub thiab lav tiv thaiv corrosion. |
BaoHui Steel Qhov Kev Pom Zoo Kawg: Hauv koj cov ntaub ntawv kev yuav khoom, qhia ncaj qha: "UNS S32205 Duplex Stainless Steel, ua tau raws li qhov yuav tsum tau ua ntawm S31803, nrog Nitrogen cov ntsiab lus 0.14-0.20% (lub hom phiaj Ntau dua lossis sib npaug rau 0.15%), lav PREN Ntau dua lossis sib npaug rau 35 suav ib ASTM G48, thiab raug teeb meem intermetallic theem kuaj ib . ASTM A" Txoj hauv kev no ua kom ntseeg tau qhov zoo ntawm cov khoom siv thiab txo cov kev pheej hmoo ntawm cov neeg muag khoom muab qis dua - cov khoom siv raug nqi ua rau cov qub S31803 yam tsawg kawg nkaus.
Hais txog BaoHui Steel: Nrog 15 xyoo ntawm kev tshwj xeeb hauv duplex stainless hlau, BaoHui Steel tau muab cov ntaub ntawv daws teeb meem rau ntau tshaj 200 engineering project thoob plaws 37 lub teb chaws. Cov ntaub ntawv thiab kev nkag siab hauv tsab xov xwm no yog ua raws li BaoHui Steel's hauv -kev tshuaj ntsuam xyuas hauv tsev, kev tshawb nrhiav tsis ua hauj lwm, thiab kev tshawb fawb hauv kev lag luam. Rau qhov project-kev pab xaiv cov khoom tshwj xeeb lossis cov qauv rau kev yuav khoom tshwj xeeb, thov hu rau peb pab neeg ua haujlwm. Email:baohui@bhsteelpipe.com
