Failed Again? The Hidden Cost of Choosing the Wrong Clad Plate
Have you watched a hydrocracker vaa fail after only three years? Chloride stress corrosion cracking found its way through the welded overlay. The repair bill exceeded the original fabrication cost. Solid titanium was proposed—until procurement flagged the $2 million price tag for a 50-meter column.
This scenario repeats. Engineers bet on cheaper roll-bonded sheets or thin weld overlays. O le taunuuga? High corrosion rates, unplanned shutdowns, and lost gaosiga. The root cause is not cost—it’s the wrong bond technology.
Titanium ofu steel plate for petroleum refining solves this. Explosion bonding creates a metallurgical bond with zero dilution. Leai ni mea fe'avea'i malepelepe. E sili atu le malosi o le soli 140 MPa. O le lagolago u'amea e tu'uina atu le fa'amaoni fa'atulagaina i 60% itiiti ifo le mamafa nai lo titanium malo. Ae e te manaʻomia le faʻamatalaga saʻo, le faiga sa'o o le fausiaina, ma se sapalai agavaa.
O lenei tusiga e tuʻuina atu faʻamatalaga. Leai se fulufulu. O tulaga nei, i'uga o su'ega, ma fa'aalia le poto masani fa'atino.
Aisea e le manuia ai le tamaoaiga o le Titanium Solid. Aisea e le mafai ai ona fa'aa'oa'o le fa'auluuluga.
Ole filifiliga ile va ole titanium malosi, fa'apipi'i u'amea, ma faaofuina ipu e le'o a'oa'oga. E iloa ai pe tumau lau va'a 20 tausaga pe 3.
| Meafaitino / Faiga | Tete'e a'e | Amiotonu o noataga | Tapulaa Mafiafia | Tau Fa'atatau (i le m² mo 25 mm mafiafia atoa) |
|---|---|---|---|---|
| Titanium Malosi (Gr. 2) | Lelei | N/A (tutusa) | le gata, ae mamafa | 100% (laina faavae) |
| Uila fau (Titanium i luga o le sila) | Lelei, ae dilution i le interface | 15-30% uʻamea faʻavaivai e faʻavaivaia ai le pala | Ufiufi ≤ 5 mm masani; tulaga lamatia o le dilution i tua atu 8 mm | 55-65% |
| Papa u'amea Fa'aofuofu Titanium Pa'u | Lelei (mama titanium layer) | Fa'ameamea moni; 0% fa'avaivai | Ufiufi: 1.5–10 mm; Backing: i luga 100+ mm | 40–55% |
Data from a 2023 study by the Materials Technology Institute (MTI) confirms: in simulated sour service (5% H2S, 200°C, pH 3.5), weld overlay showed localized corrosion at the interface after 500 itula. Explosion-bonded papatusi showed no attack after 2,000 itula.
The cost argument is straightforward. Solid titanium Gr. 2 costs roughly $45–55 per kg. Steel backing costs $1–2 per kg. A vessel requiring 25 mm total thickness with solid titanium costs twice as much as an explosion-bonded plate with 5 mm titanium + 20 mm SA516 Gr. 70. The weight difference is also critical. Lighter vessels reduce foundation costs and simplify lifting.
Titanium clad steel plate for petroleum refining is not a compromise. It is the engineering optimum.
The Explosion Bonding Process: Why It Creates the Strongest Metallurgical Bond
Feso'ota'iga pa (also called explosive welding) is a solid-state welding process. O le fa'atonuina o mea pāpā e fa'aoso ai le fa'alava o le titanium i le saosaoa maualuga i luga o le sila. O le a'afiaga e faia ai se va'alele plasma e fa'amamā ai luga. E fusifusia uamea e aunoa ma le liusuavai.
E taua tele lenei mea. E le pei o le u'u u'amea—lea e fefiloi ai le titanium ma le u'amea ma fau ai ni mea fe'avea'i o le TiFe—o le pa'u o le fusi e leai se sone fa'afefeteina.. O le atinaʻe e mama, laina fusiga galu.
Fa'ailoga autu mo le fa'amamaina o fa'aoga:
- Malosi sele: ≥ 140 MPa ile ASTM B898. Fa'amaonia.
- Su'ega Ultrasonic: Taliaina ile ASTM A578 Level 1. Leai se vaega motumotu e sili atu nai lo 75 mm i soo se itu.
- Ufiufi mafiafia: E masani lava 3 mm mo alauni e pala; i luga 10 mm mo siosiomaga ogaoga.
- Uamea lagolago: SA516 Gr. 70, SA387 Gr. 11/22 (mo auaunaga oona), poʻo le ASTM A105 mo mea faʻapipiʻi.
Aisea e taua tele ai le malosi o sootaga? I totonu o se mea fa'aola fa'avavevave le uila vevela (amataga/tapuni), faʻalauteleina faʻavela eseese i le va o le titanium (8.5 µm/m·°C) ma uamea (11.7 µm/m·°C) generates shear stress at the interface. A weak bond fails. Explosion-bonded plates survive thousands of cycles.
Case in point: A major refinery in the Middle East replaced weld-overlay clad reactors with explosion-bonded titanium clad steel plates in 2019. Ina ua uma 4 years of operation with high-chloride crude, no disbonding or corrosion was detected. The previous weld-overlay vessels required repair after 18 masina.
Critical Applications: Where Titanium Clad Steel Plate Excels in Refining
Not every vessel needs titanium cladding. But when the process stream contains chlorides, H2S, or organic acids at high temperature, titanium is the only cost-effective option.
| Equipment | Service Conditions | Failure Mode without Titanium Cladding | Titanium Clad Steel Solution |
|---|---|---|---|
| Desulfurization Reactors (RDS/VRDS) | 350-425°C, 14 MPa, H₂S+H₂, chlorides from catalyst | Sulfide stress cracking (SSC) o uamea uamea ua ufiufi; osofaʻiga polythionic acid | O Gr. 2 fa'apipi'i e tete'e SSC ma polythionic acid; uamea lagolago au'u mamafa |
| Tu'ufa'atasi o Koluma (Atmospheric/Vacuum) | Luga: 150°C, HCl/H₂S; Lalo: 350°C, naphthenic acids | Mata'utia HCl pala ile vaega pito i luga; naphthenic acid corrosion i le ogatotonu | Ti ufiufi i luga 1/3 o koluma; 317L po'o le duplex mo vaega maualalo ile su'esu'ega tau |
| Su'e vevela (Fafaga/Tafe) | Atigi: 300°C, faiga e tumu i le chloride; Faila: 200°C, vai malulu | Chloride fa'amamafa a'a ta'e o austenitic uamea | Pepa fa'au'u fa'a'ofu Titanium ma alavai; faagaau Ti malo; atigi uamea mo le tamaoaiga |
| Va'a Hydrocracker | 400°C, 17 MPa, maualuga H₂S, amonia, chloride | Ammonium bisulfide pala; ta'e o le hydrogen (HIC) i le uamea | O Gr. 12 ufiufi (sili atu ona fa'asa'o ile fa'a'ele'ele); uamea lagolago agavaa mo NACE MR0175 |
O talosaga ta'itasi e mana'omia ai fa'amatalaga fa'aeteete o le togi fa'apipi'i. O Gr. 2 e fetaui mo le tele o siosiomaga faʻamamaina. O Gr. 12 fa'aopoopo 0.3% Mo ma 0.8% Ni e fa'aleleia atili ai le tete'e atu i le fa'a'ele'ele o le ga'o i 'au'aunaga o le chloride maualuga. ASTM B898 e aofia uma togi.
ASTM B898: O le tulaga e tatau ona e iloa a'o le'i fa'atauina
ASTM B898 o le faʻatonuga faʻapitoa mo uamea fa'aofuina titanium mo le fa'amamaina o le suau'u. E fa'amatalaina mea uma e te mana'omia e fa'amaoti, agavaa, ma asiasia le oloa.
Manaoga autu ile B898:
- Fa'avasegaga o noataga: Vasega 1 (malosi sele ≥ 140 MPa, noataga atoa) po o le Vasega 2 (malosi sele ≥ 105 MPa, talia mo auaunaga le taua). Mo le faamamaina, fa'asino tonu Vasega 1.
- Ufiufi mafiafia faapalepale: ± 0.5 mm mo le mafiafia fa'apitoa e o'o atu i 5 mm; ±1.0 mm mo le 5–10 mm.
- Su'ega ole Ultrasonic: I le ASTM A578 Level 1 po'o Tulaga 2. Tulaga 1 e sili atu le mamafa (leai se vaega e le fa'atasia tagata ta'ito'atasi > 75 mm i le pito sili ona umi).
- Su'ega sele: Fa fa'ata'ita'iga ile ipu (pito taitasi ma totonugalemu). E tatau ona ausia le fa'atapula'a o vasega.
- Su'ega punou: 180° punou e aunoa ma le ta'e.
- Su'esu'ega vaila'au: Fa'apipi'i ile ASTM B265 (Oe Fausia 1, 2, 7, 12, ma isi.); lagolago ile ASME SA-516, SA-387, ma isi.
Aua ne'i talia se ipu fa'aofuofu e aunoa ma se lipoti fa'amaonia ASTM B898. Ua tele naua tagata fa'atau oloa e suitulaga i mea fa'apipi'i ta'avale (sootaga vaivai, leai se atigi galu) po'o ufi fa'alava (fa'afitauli fa'afefeteina). O le tulaga e taofia ai lena mea.
Fausia: Tulaga Uila e Faia pe Moti ai le Vaa
E mafai ona e fa'atauina le ipu u'amea sili ona lelei o le titanium. Afai e sese le uelo, e tafe le vaa i totonu o masina.
E tali atu le titanium ma le okesene, nitrogen, ma le hydrogen i luga atu o le 300°C. E tatau ona puipuia nofoaga e uelo ai i le kesi lega (argon) se'ia mālūlū i lalo ole 250°C. O le fa'asologa fa'amaonia lea mo le ueloina o fanua po'o faleoloa uamea fa'aofuina titanium mo le fa'amamaina o le suau'u:
- Pa'u le itu uamea fa'atasi ai ma se fa'amea fa'avae nikeli (e.g., ERNiCrMo-3) e faʻamaufaʻailogaina le uamea mai le hydrogen pickup i le taimi o le titanium uelo.
- Uu le uamea lagolago fa'aaogā fa'atumu fa'amaonia (e.g., E7018 mo SA516). Ia mautinoa le ulufale atoatoa. Tu'u tua le itu uamea e aveese ai le pata a'o le'i pasi mulimuli.
- Aveese le fa'amaufa'ailoga (pe a fa'aaogaina). Faʻamama le pito i luga ole titanium. Aua le olo i uili ua pisia—fa'aaoga meafaigaluega uamea fa'apitoa.
- Uu fa'apipi'i titanium fa'aaoga ERTi-2 fa'atumu mo Vasega 2, po'o le ERTi-12 mo le Vasega 12. Fa'amama i argon (itu uma e lua). Fa'aaogā se talita fa'asolo e puipui ai le sone uelo vevela.
- Fai fa'amau fa'amau i pito e puipuia ai le ulufale atu o sua fa'agasologa i le va o le fa'apipi'i ma le tua.
- Asiasi: Vaaia (lanu lanumoana e ta'u mai ai le faaleagaina—teena), fa'alanu fa'afefe (o luga uma titanium uelo), ultrasonic (mo le motusia i lalo o le uelo HAZ), ma le su'ega leak (helium).
Mata'utia: Aua ne'i u'u sa'o le titanium i le uamea kaponi ma se fa'atumu uamea. The TiFe intermetallic is brittle and cracks immediately. Use a buttering layer or a nickel transition piece.
A qualified fabricator who knows these steps is rare. Insist on a Welding Procedure Specification (WPS) qualified per ASME Section IX with your exact material combination. Do not accept a generic procedure.
Sourcing: Five Questions to Ask Before You Place the Order
Sourcing uamea fa'aofuina titanium mo le fa'amamaina o le suau'u from an ASTM composite panel exporter requires due diligence. Not all exporters are equal. Here is the checklist:
| Fesili | Why It Matters | Acceptable Answer |
|---|---|---|
| 1. Do you have ASTM B898 certification for Class 1 papatusi? | Ensures bond strength and testing protocols. | Ioe, with recent certificate from an accredited lab. |
| 2. What is your ultrasonic testing capability? | You need 100% inspection per A578 Level 1. | In-house UT with automated scanning and C-scan record. |
| 3. Can you supply cladding thickness > 6 mm? | O 'au'aunaga e tete'e i le pala po'o le abrasion e mana'omia ai le ufiufi mafiafia. | Ioe, i luga 10 mm Ti i luga 100 mm lagolago. |
| 4. O a togi u'amea lagolago e te ofoina atu mo auaunaga fa'afefe? | NACE MR0175/ISO 15156 e fa'atulafonoina le tausisia mo H2S. | SA516 Gr. 70 fa'atasi ai ma le su'ega HIC; SA387 Gr. 11/22. |
| 5. E te tuʻuina atu le lagolago faʻataʻitaʻiga poʻo le aʻoaʻoga uelo? | Le lelei o le gaosiga e fa'aleagaina ai le ipu sili ona lelei. | Ioe, matou te tu'uina atu se ta'iala uelo ma lagolago i luga ole laiga. |
Aua le fa'atuatuaina se tasi e aunoa ma le va'aia o la latou tusi lesona lelei, lipoti su'ega, ma ia le itiiti ifo ma le tasi le galuega faasinomaga i le faamamaina. O le tau o se ipu fa'alavalava ua le manuia—ua leiloa le gaosiga, toe faaleleia, fa'alavelave fa'alavelave fa'afuase'i-e sili mamao atu i le 10-15% le eseesega o tau i le va o se fa'atau oloa fa'apitoa ma le le fa'amaonia.
Le La'au Lalo: Fa'asaoina o tau, Ola umi, ma le Filifiliga Fa'amaumauga
E $1–2 le tau ile kilokalama. E $45-55 le tau ole Titanium ile kilokalama. O le 50 tone reactor i le titanium malo e tau $2.5 miliona mo na'o meafaitino. O le reactor lava e tasi na fausia i le ipu u'amea fa'aofuina titanium (5 mm Ti + 20 mm uamea) tau $1.1 miliona—a 56% tupe teu.
Ae ole fua fa'atatau ole Aofa'iga Tau ole Puleaina (TCO). O se ipu ofu e tumau 20+ tausaga i le tautua oona. Uila fa'alava e tumau i le 5-10 tausaga a'o le'i a'afia fa'apitonu'u i le sone fa'apalapala e sui malosi.. E manino le faʻatusatusaga o le TCO:
- Titanium malo: Maualuga tau amata, maualalo le tausiga, ae o le mamafa tele e manaʻomia ai faavae faʻamalosia.
- Uu fau: Tau amata feololo, tausiga maualuga (asiasiga, toe faaleleia uma 2-3 tausaga), tulaga lamatia o mala fa'aletonu.
- u'amea fa'afuifu titanium pa'u: TCO maualalo ona o le ola umi, leai se pala i lalo o le insulation, ma le fa'atulagaina lelei.
Alamanuia fa'amaumauga mai a 2022 su'esu'ega o 12 O fale faʻamamaina a Amerika na faʻaalia ai o fale o loʻo faʻaogaina le titanium faʻapipiʻiina o latou paʻu mo a latou iunite maualuga-chloride na leai ni faʻalavelave faʻafuaseʻi na tapunia i le 10-tausaga suʻesuʻega.. O i latou o lo'o fa'aogaina isi metotia fa'apipi'i e averesi 2.5 tapunia i le iunite.
Ua faatelevaveina le tulaga. A'o fa'agaioiina e fale fa'amamāina ua fa'atuputeleina le oona oona (maualuga le sulfur, maualuga TAN), uamea fa'aofuina titanium mo le fa'amamaina o le suau'u o lo'o avea ma fa'amatalaga fa'apitoa mo fau ma fa'afouga fou. Ua faʻamaonia e le tekonolosi ia lava mo 30+ tausaga. Ua matua. E faatuatuaina. O lea ua taugofie-tauva.
Fa'afaigofie lau isi fa'amatalaga. Fa'asolo mai la matou ta'iala filifilia fua mo ipu fa'aofuina titanium i le auaunaga fa'amamaina. Po'o le sili atu - vala'au la matou 'au fa'ainisinia talosaga. Matou te fesoasoani ia te oe e fuafua le TCO sa'o mo lau va'a. Leai se fa'atauga. Na'o fa'amaumauga.
Fa'atau
Metal Plate 4U ose fa'ameaalofa fa'ameamea fa'ameamea i le lalolagi atoa & tagata gaosi oloa ma le poto masani i le tuuina atu o le sila u'amea maualuga maualuga, u'amea nikeli, uamea apamemea, ma ipu uamea titanium tu'ufa'atasi. O le kamupani e auina atu i fafo i le tele o atunuu, pei o Amerika, Kanata, Europa, UAE, Afelika i Saute, ma isi. I le avea ai ma se ta'uta'ua pa'u fa'apipi'i fa'apipi'iina ipu fa'apipi'i, Metal Plate 4U pulea le maketi. O la matou 'au faigaluega fa'apolofesa e tu'uina atu fofo lelei e fesoasoani e fa'aleleia atili le lelei o pisinisi eseese, pei o va'a mamafa, fa'afesuia'i vevela, fau vaa, ma le gaosiga o vailaau, fatuina le taua, ma faigofie ona feagai ma luitau eseese. Afai o lo'o e su'e ni u'amea tu'ufa'atasi panels po'o ni ipu fa'aofuina bimetal, faamolemole lagona le saoloto e faafesootai matou!