Cov yeeb nkab zoo tshaj plaws rau Offshore Seawater Systems

 

Super Duplex 2507 (UNS S32750 / 1.4410) yog qhov zoo tshaj plaws tag nrho cov yeeb nkab khoom siv rau cov dej hiav txwv sab nrauv. Nws PREN saum toj no 40, qhov tseem ceeb pitting kub siab tshaj 50 degree, thiab yield zog ntawm 550 MPa muab nws lub corrosion margin thiab txhua yam muaj peev xwm kom ciaj sia chlorinated seawater rau 20+ xyoo tsis muaj txheej dependence los yog nquag soj ntsuam.

 

• Super Duplex 2507yeej vim nws tsuas yog cov khoom siv nyob rau hauv nruab nrab- tus nqi ntau yam uas tshem tawm pitting, crevice corrosion, thiab chloride stress corrosion cracking nyob rau hauv chlorinated seawater yam tsis tas yuav tsum tau txheej txheej, tiv thaiv cathodic, los yog phab ntsa thickness corrosion.
• TIAB SA 2205yog qhov kev xaiv thib ob rau kev pabcuam tsis tshua muaj siab (tsis yog -chlorinated, qis dua);
• Cov pa roj carbon steelnrog txheej thiab kev tiv thaiv cathodic yog siv tau rau loj - txoj kab uas hla, qis - cov kab siab qhov kev tshuaj xyuas zoo;
• Titanium Gr.2yog qhov kev xaiv zoo tshaj plaws rau cov raj xa hluav taws xob kub thiab qhov tseem ceeb subsea flowlines qhov twg tsis muaj kev tiv thaiv corrosion tiv thaiv tus nqi.

 

Lub luag haujlwm	Khoom siv	PREN	Tus nqi txheeb ze
Zuag qhia tag nrho	Super Duplex 2507 (S32750)	PIB 41-43	5.0-6.0x
Kev xaiv thib ob	Duplex 2205 (S32205)	PIB 34-36	3.5-4.5x
Kev xaiv nyiaj txiag	Cov pa roj carbon steel (A106 B+ txheej + CP)	n/a	1.0x
Hwm Option	Titanium Gr.2 (R50400)	tiv thaiv kab mob	12.0-15.0x

 

 

 

Ambient kub 5-25 degree, chlorinated rau 0.5-2.0 ppm residual chlorine rau biofouling tswj. Kev khiav hauj lwm siab txog li 20 bar rau txhaj tshuaj thiab txias kab. Thiab 20-xyoo tsim lub neej nrog tsawg kawg nkaus npaj saib xyuas nkag. Cov xwm txheej no yog ib qho ntawm North Hiav Txwv, Gulf of Mexico, thiab West African offshore platforms.

 

 

Khoom siv	Corrosion Resistance	Chloride Resistance	Mechanical Strength	Kub muaj peev xwm	Cia siab rau Kev Pabcuam Lub Neej	Tus nqi txheeb ze	Pom zoo
Carbon Steel	pluag	pluag	Zoo heev	Nruab nrab	2-10 xyoo tsis muaj kev tiv thaiv	Tsawg	Tsis muaj
316L SS AW	Nruab nrab	Nruab nrab	Nruab nrab	Nruab nrab	5-15 xyoo	Nruab nrab	txwv
TIAB SA 2205	Zoo	Zoo	Siab	Siab	20-30 xyoo	Nruab nrab	Yog lawm
Super Duplex 2507	Zoo heev	Zoo heev	Siab heev	Siab	30+ xyoo	Nruab nrab-High	Qhov Zoo Tshaj Plaws
254 SIB	Zoo heev	Zoo heev	Nruab nrab	Siab	30+ xyoo	Siab	Yog lawm
Titanium Qib 2	Zoo heev	Zoo heev	Nruab nrab	Siab	40+ xyoo	Siab heev	Hwm
Ib 625	Zoo heev	Zoo heev	Siab	Siab heev	40+ xyoo	Siab heev	Kev Pabcuam Tshwj Xeeb

 

Cov pa roj carbon steel (A106 B):

suav nrog vim nws yog lub neej ntawd rau loj - txoj kab uas hla, qis - kab siab. Nrog epoxy txheej, kev tiv thaiv cathodic, thiab 3 hli kev tiv thaiv corrosion, carbon hlau tuaj yeem ncav cuag 15-20 xyoo.

 

316L (S31603):

Qhov feem ntau yuam kev hauv seawater piping. Nws PREN ntawm ~ 24 muab qhov tseem ceeb pitting kub ntawm tsuas yog 15-20℃hauv dej hiav txwv. Hauv dej hiav txwv chlorinated ntawm 20-25 degree, 316L pits hauv 2-5 xyoos.

 

 

Duplex 2205 (S32205):

Ib qho khoom nruab nrab - ntau yam kev xaiv. PREN ~ 35 thiab CPT ~ 30℃muab kev tiv thaiv zoo hauv cov dej tsis muaj chlorinated lossis dej txias. Hauv kev pabcuam sov chlorinated, nws tuaj yeem ua rau lub qhov crevices ntev ntev.

 

Super Duplex 2507 (S32750):

The benchmark. PREN >41, CPT siab tshaj 50 degree, thiab 550 MPa yield zog. Nws tuav cov dej hiav txwv chlorinated ntawm qhov kub thiab txias uas tsis muaj kev phom sij rau lub neej 25 xyoo.

 

254 SMO (S31254):

A 6% Mo austenitic stainless hlau nrog qhov sib npaug pitting tsis kam rau 2507. Nws yooj yim dua rau vuam (austenitic) tab sis muaj zog qis dua (300 MPa tawm los) thiab cov ntsiab lus nickel ntau dua ua rau nws kim dua me ntsis.

 

"Piv Super Duplex 2507 thiab 6Mo rau cov kav dej sab saum toj sab saum toj hauv qab cov tshuaj chloride siab."

Khoom	Super Duplex 2507	6Mo Stainless hlau
UNS Qib	S32750	S31254
Hom Lub Npe	SAF 2507 / F53	254 SMO / 6Mo
Qauv	Duplex (50% ferrite + 50% austenite)	Super austenitic
Chromium (Cr)	24–26%	19.5–20.5%
Nickel (Ni)	6–8%	17.5–18.5%
Molybdenum (hli)	3–5%	6–6.5%
Nitrogen (N)	0.24–0.32%	0.18–0.22%
PREN	Ntau dua lossis sib npaug li 42	~43–45
Yield zog	~ 550 MPa yam tsawg kawg nkaus	~ 300 MPa yam tsawg kawg nkaus
Qhov ntom	qis	Siab dua
Nqi	Feem ntau qis dua	Feem ntau siab dua

Rau feem ntau ntawm ntug dej hiav txwv sab saum toj ntug dej hiav txwv piping project, Super Duplex 2507 feem ntau yog qhov kev xaiv zoo tshaj vim tias nws muab ze 6Mo- qib corrosion kuj nrog ntau dua lub zog thiab qis dua lub neej.

 

Alloy 625 (N06625):

Premium nickel alloy with PREN >50. Overkill rau bulk seawater piping tab sis zoo tagnrho rau cov khoom tseem ceeb - cladding ntawm flanges, bellows, weld overlay ntawm raj los xij.

 

Titanium Gr.2 (R50400):

Tiv thaiv kom pitting hauv dej hiav txwv ntawm txhua qhov ntsuas kub. Qhov kawg corrosion-cov ntaub ntawv tiv taus. Txawm li cas los xij, cov khoom siv siab, kev vuam nyuaj, thiab lub zog qis ua rau nws siv tsis tau rau cov kav dej loj -. Qhov zoo tshaj plaws rau cov raj xa hluav taws xob kub thiab cov kab me me - txoj kab nruab nrab ntawm lub hiav txwv.

 

CuNi vs. Super Duplex rau Marine Applications

• CuNi=zoo heev seawater compatibility + biofouling kuj + yooj yim fabrication; CuNi yog cov khoom siv hauv hiav txwv marine.
• Super Duplex=siab zog + superior chloride corrosion kuj + siab - muaj peev xwm siab; Super Duplex yog qhov niaj hnub siab - cov khoom siv sab nrauv.

 

 

1. Pitting corrosion tshem tawm: PREN ntawm 41-43 thiab CPT siab tshaj 50℃txhais tau tias 2507 tsis pit nyob rau hauv cov dej hiav txwv chlorinated ntawm ib qho kev ua haujlwm kub (5-25 degree).
2. Crevice corrosion tshem tawm: Qhov tseem ceeb crevice kub (CCT) ntawm 2507 yog kwv yees li 35-40 degree, zoo tshaj ambient seawater kub.
3. Chloride SCC tsis kam: Lub duplex microstructure (50/50 austenite-ferrite) yog inherently resistant rau chloride SCC ntau dua austenitic qib.
4. Lub zog siab txo qhov hnyav: 550 MPa yield zog (vs . 170 MPa rau 316L) txhais tau tias cov phab ntsa nyias nyias rau tib qhov kev ntsuas siab.
5. Tsis muaj txheej los yog CP yuav tsum tau: Tsis zoo li carbon steel, 2507 yog siv liab qab. Tsis muaj txheej txheej hnub so los tshuaj xyuas, tsis muaj anodes los hloov, tsis muaj CP kev tshawb fawb.

 

 

Tshuaj muaj pes tsawg leeg ntawm Super Duplex 2507

Lub ntsiab	Ib txwm%	Lub luag haujlwm hauv Seawater Service
Cr	24.0-26.0	Cov ntaub ntawv passive zaj duab xis; puag corrosion kuj
Ni	6.0-8.0	Stabilizes austenite theem; txhim kho toughness thiab SCC kuj
Mo	3.0-5.0	Qhov tseem ceeb rau chloride pitting thiab crevice corrosion kuj
N	0.24-0.32	Nce pitting kuj, ntxiv dag zog rau ob theem
C	0.030 max	Khaws qis kom tsis txhob hnov ​​​​qab thiab intergranular corrosion
Mn	1.2 max	Deoxidizer; tswj kom tsis txhob muaj kev puas tsuaj rau theem tsim
Cu	0.5 max	Kev txhim kho me me hauv acid tsis kam

 

Mechanical Properties

Khoom	Tus nqi	Engineering Note
Yield zog (min)	550 MPa	3.2x siab dua 316L; enables thinner phab ntsa thiab txo qhov hnyav
Tensile zog (min)	795mpa ua	Siab kawg zog; kev nyab xeeb margin tiv thaiv siab spikes
Elongation (min)	15%	Tsim nyog ductility rau kev tsim thiab khoov
Hardness (max)	319 HWB	High hardness resists yaig nyob rau hauv siab - ceev zones

 

Corrosion Performance

Khoom	Tus nqi	Lub ntsiab lus
PREN	41-43	Zoo tshaj 40 qhov pib; tsis muaj pitting xav tau
CPT	50-60 degree	Ua haujlwm kub (5-25 degree) deb ntawm CPT
CCT	35-40 degree	Crevice corrosion ntawm flange ntsej muag tsis xav tau
Max Cl - concentration	>10,000 ppm	Dej hiav txwv ntawm ~ 19,000 ppm hauv kev muaj peev xwm
Corrosion npaum li cas hauv dej hiav txwv	<0.01 mm/year	Zoo xoom; tsis muaj kev tiv thaiv corrosion yuav tsum tau
SCC tsis kam	Zoo heev ntawm ambient	Tsis muaj kev ntseeg siab tsis ua haujlwm hauv qab 60 degree

 

Muaj Cov Khoom Muag Khoom

Yam khoom	Muaj	Sau ntawv
Seamless Yeeb Nkab	Muaj	ASTM A790 - daim ntawv tseem ceeb rau kev xa dej hiav txwv sab nraud
Welded yeeb nkab	Muaj	ASTM A 928 - rau txoj kab uas hla loj dua
Tube	Muaj	ASTM A 789 - rau kev sib hloov cua sov thiab ntsuas ntsuas
Phaj	Muaj	ASTM A 240 - rau fabricated Cheebtsam thiab cov hlab ntsha
Flange	Muaj	ASTM A182 Gr F53 - vuam caj dab, plam- rau, qhov muag tsis pom
Fittings	Muaj	ASTM A182 / A815 - luj tshib, tees, reducers

 

 

• Mill vs. tub luam: Xaiv lub zeb los yog zeb-tso cai distributor uas muaj peev xwm muab tag nrho cov cua sov traceability.
• PMI muaj peev xwm: Qhov no ntes tau qhov feem ntau ntawm ntug dej hiav txwv tsis ua haujlwm: cov khoom sib xyaw-ups qhov twg 2205 lossis 316L raug xa tawm raws li 2507.
• Kev Ntsuas: Saib rau cov neeg xa khoom nrog UT, kuaj hydrostatic, thiab kev sim tshuab.
• Cov ntaub ntawv kev lag luam: Thov xa cov ntaub ntawv los ntawm cov haujlwm yav dhau los ntawm ntug dej hiav txwv, tshwj xeeb tshaj yog cov kav dej hiav txwv xa mus rau cov tswv lag luam loj (Equinor, Plhaub, BP, Petrobras).
• Thib peb-kev soj ntsuam tog: Tus neeg muag khoom yuav tsum lees txais SGS, Bureau Veritas, lossis DNV tshuaj xyuas yam tsis muaj kev tawm tsam.

Hu rau tam sim no

 

1. Dab tsi yog cov khoom siv yeeb nkab zoo tshaj plaws rau cov dej hiav txwv?

Super Duplex 2507 (UNS S32750) yog cov khoom siv yeeb nkab zoo tshaj plaws rau cov dej hiav txwv sab nrauv. Nws PREN ntawm 41-43 thiab qhov tseem ceeb pitting kub siab tshaj 50 C tshem tawm pitting thiab crevice corrosion nyob rau hauv chlorinated seawater ntawm ib txwm khiav hauj lwm kub (5-25 degree), muab nws ib tug 25+ xyoo kev pab cuam lub neej yam tsis muaj txheej los yog cathodic tiv thaiv.

 

2. Puas yog Super Duplex 2507 zoo dua 316L rau dej hiav txwv?

Yog lawm, los ntawm qhov dav dav . 316L muaj PREN ntawm ~ 24 thiab qhov dej hauv cov dej hiav txwv chlorinated saum 15-20 degree, feem ntau ua tsis tiav hauv 3-8 xyoo. Super Duplex 2507 muaj PREN ntawm 41-43 thiab CPT siab tshaj 50 degree, txhais tau tias nws tsis pit ntawm qhov dej hiav txwv kub ib txwm muaj . 2507 kuj muaj 3.2x lub zog ntawm 316L.

 

3. Super Duplex 2507 yeeb nkab kav ntev npaum li cas hauv cov dej hiav txwv sab nrauv?

Super Duplex 2507 yeeb nkab yog tsim los rau lub neej ua haujlwm 25+ xyoo nyob rau hauv ntug dej hiav txwv. Hauv cov ntaub ntawv tshawb fawb North Hiav Txwv, 2507 txoj kab txhaj tshuaj pom tias xoom phab ntsa poob tom qab 11 xyoo ntawm kev pabcuam txuas ntxiv hauv dej hiav txwv chlorinated, tsis muaj txheej txheej lossis cathodic tiv thaiv.

 

4. Vim li cas 316L stainless hlau corrode hauv dej hiav txwv?

316L corrodes nyob rau hauv dej hiav txwv vim nws cov zaj duab xis passive yog nkag los ntawm chloride ions ntawm qhov kub siab tshaj 15-20 degree. 2-3% molybdenum hauv 316L tsis txaus los tiv thaiv pitting hauv dej hiav txwv muaj ~ 19,000 ppm chloride, thiab cov tshuaj chlorine residual los ntawm biofouling kev kho mob nrawm nrawm.

 

5. Tus nqi PREN yog dab tsi rau Super Duplex 2507?

PREN rau Super Duplex 2507 yog 41-43, xam raws li %Cr + 3.3x%Mo + 16x%N siv cov muaj pes tsawg leeg ntawm 25% Cr, 4% Mo, thiab 0.28% N. A PREN saum toj 40 yog qhov chaw txais dav dav rau kev tiv thaiv pitting hauv dej hiav txwv.

 

6. Cov pa roj carbon steel puas tuaj yeem siv rau cov kav dej hiav txwv?

Cov pa roj carbon steel tuaj yeem siv rau cov kav dej hiav txwv nkaus xwb nrog epoxy txheej, tiv thaiv cathodic, thiab kev tiv thaiv corrosion - thiab tsuas yog rau loj - txoj kab uas hla, qis - cov kab siab nrog kev soj ntsuam zoo. Yog tsis muaj cov kev ntsuas no, carbon steel corrodes ntawm 0.1-0.3 hli / xyoo hauv aerated seawater.

 

7. Puas yog Titanium zoo dua Super Duplex rau dej hiav txwv?

Titanium Gr.2 tiv thaiv pitting hauv seawater thiab outperforms Super Duplex 2507 nyob rau hauv kiag li corrosion kuj. Txawm li cas los xij, Titanium raug nqi 12-15x carbon steel (vs. 5-6x rau 2507), nyuaj rau vuam, thiab muaj zog qis dua. Titanium yog tsim nyog rau cov cua kub exchanger raj thiab tseem ceeb subsea kab, tsis yog rau loj-inch bulk piping.

 

8. Vim li cas titanium tsis ua haujlwm hauv qee qhov dej hiav txwv?
Titanium yog dav suav hais tias yog ib qho ntawm cov khoom siv zoo tshaj plaws rau kev pabcuam dej hiav txwv vim nws qhov zoo tshaj plaws corrosion kuj. Txawm li cas los xij, titanium tseem tuaj yeem ua tsis tiav hauv qee qhov chaw dej hiav txwv. Titanium muaj zog affinity rau hydrogen. Hauv qee qhov xwm txheej, hydrogen tuaj yeem nkag mus rau titanium lattice thiab tsim cov titanium hydrides brittle.

 

9. Puas yog cov kav dej hiav txwv sab nrauv puas yuav tsum tau ua raws NACE MR0175?

NACE MR0175 / ISO 15156 kev ua raws cai tsuas yog xav tau yog tias cov kav dej yuav ntsib cov kev pabcuam qaub (H2S- muaj cov kua dej). Cov kav dej hiav txwv ntshiab tsis tas yuav tsum ua raws NACE. Txawm li cas los xij, yog tias cov kab hauv dej hiav txwv tuaj yeem pom cov dej sib xyaw lossis H2S ingress, cov khoom yuav tsum tsim nyog rau NACE MR0175.

 

10. Dab tsi yog qhov tseem ceeb pitting kub ntawm Super Duplex 2507?

Qhov tseem ceeb pitting kub (CPT) ntawm Super Duplex 2507 hauv tus qauv ASTM G150 kuaj yog 50-60 degree. Qhov no yog qhov zoo tshaj qhov dej hiav txwv dej hiav txwv ua haujlwm kub (5-25 degree), muab kev nyab xeeb ntawm 25-55 C tiv thaiv kev mus ncig ua si.

 

Hais txog Zhengzhou Huitong Pipeline Equipment Co., LTD.

HT PIPE (txoj kab uas hla loj steel yeeb nkab manufacturers) yog ib tug zoo -paub stockist thiab exporter. Peb yog cov khoom siv stainless / carbon / npib tsib xee alloy khoom xa khoom nrog 15+ kev xa tawm. Peb tsis tsuas yog muab cov kav dej, phaj, puag ncig, tab sis kuj yog cov yeeb nkab fittings, flanges, thiab lwm yam. Tiv tauj peb kom paub ntau ntxiv thiab cov nqi dawb.

 

 

✅ ISO 9001: 2015

✅ MTC 10204 3.1 3.2

✅ 100% PMI (Positive Material Identification)

✅ Ultrasonic Testing (Rau ASME VIII)

✅ Third-Kev Tshawb Fawb Kev Tshawb Fawb (SGS/BV/DNV/LR)

✅ NACE MR0175 / ISO 15156