Seamless Vs. Welded ASTM B338 GR2 Titanium Tube
Jun 30, 2026
ASTM B338 GR2 yog dab tsi?
ASTM B338 npog ob leeg seamless thiab welded titanium raj feem ntau siv rau saum npoo condensers, tshav kub exchangers, thiab evaporators.
Qib 2 (GR2):Kev lag luam ntshiab titanium nrog lub zog nruab nrab (Yield Ntau dua lossis sib npaug ntawm 275 MPa) thiab tshwj xeeb corrosion kuj, tshwj xeeb tshaj yog tiv thaiv chlorides, seawater, thiab oxidizing acids.
Vim li cas GR2?Nws muaj qhov sib npaug zoo tshaj plaws ntawm formability, weldability, thiab tus nqi - muaj zog dua GR1, ntau tus nqi pheej yig dua GR7 lossis GR12.
Seamless vs. Welded
| Yam | Seamless Tube | Welded Tube |
|---|---|---|
| Raw Khoom | Khoom round billet | Titanium sawb / kauj |
| Cov txheej txheem tseem ceeb | Rotary piercing + pilger dov / extrusion | Roll forming + autogenous TIG vuam |
| Phab ntsa Thickness Range | Feem ntau hnyav dua (min{0}}mm nyob ntawm OD) | tuaj yeem nyias nyias (0.5mm thiab siab dua) |
| Dimensional kam rau ua | Nruab nrab; nyob rau hauv ovality thiab eccentricity | Zoo heev; meej OD, ID, thiab roundness |
| Nto Zoo | Internal nto tej zaum yuav muaj me ntsis kauv cov cim | Smooth, uniform nto ob sab hauv thiab tawm |
| Lub Sijhawm Lead | Ntev (6-8 lub lis piam ib txwm) | Shorter (3-4 lub lis piam ib txwm) |
Sib tham txog koj qhov kev xav tau ntawm qhov project
Corrosion Resistance
| Ib puag ncig | Seamless | Welded (nrog rau annealing) | Txiav txim |
|---|---|---|---|
| Dej hiav txwv / Brine (ambient) | Zoo heev | Zoo heev | Khi |
| High-temperature chlorides (>200 degree) | Zoo heev | Zoo (xav tau kev ntxhov siab) | Seamless nyiam |
| Txo cov kua qaub (piv txwv li, HCl, H₂SO₄) | Zoo | Zoo (weld cheeb tsam me ntsis weaker) | Seamless nyiam |
| Crevice corrosion nyob rau hauv deposits | Sib npaug | Sib npaug | Khi |
Ib tug welded raj uas tautag nrho annealed tom qab vuamrestores thaj tsam weld corrosion kuj mus rau ze - niam txiv - qib hlau. Tsis txhob txais raws li -welded (un-annealed) raj rau cov kev pabcuam corrosive.
Mechanical Strength
| Parameter | Seamless | Welded |
|---|---|---|
| Joint Efficiency Factor | 1.00 (ASME Section VIII) | 0.85 (yog tias tsis muaj hluav taws xob tag nrho) |
| Lub zog tawg | Siab dua (uniform grain structure) | Tsawg me ntsis; txaus rau feem ntau GR2 daim ntawv thov |
| Fatigue / Vibration Resistance | Superior | Tsis muaj zog ntawm weld ntiv taw; zam kev siab -cyclic loading |
| Haum Max. Siab | >10 MPa | Feem ntau Tsawg dua lossis sib npaug li 6 MPa (yuav siab dua nrog phab ntsa tuab) |
Fabrication & Installation
| Daim ntawv thov | Seamless | Welded |
|---|---|---|
| Roller Expansion rau Tubesheet | nyuaj vim ovality; pheej hmoo ntawm cov pob qij txha xoob | Zoo tagnrho; precision roundness xyuas kom xau- nrawm nrawm |
| U-khoov (tight radius) | Zoo | Risk ntawm weld wrinkling; yuav tsum tau ceev faj tsim |
| Vuam rau Tubesheet | Txuj | Standard (tsis txhob muab seam ncaj qha rau ntawm qhov sib txuas) |
Seamless vs Welded ASTM B338 GR2 Titanium Tube
| Kev Pabcuam | Hom kev pom zoo | Kev xav |
|---|---|---|
| High pressure (> 8 MPa) & high temp (>300 degree) | Seamless | Tsis muaj vuam seam vulnerability nyob rau hauv thermal-mechanical stress |
| Kev vibration hnyav lossis cyclic loading | Seamless | Superior qaug zog endurance |
| Aggressive acids (HF, chlorine ntub dej) | Seamless | Tshem tawm qhov tshwj xeeb weld nres txaus ntshai |
| Plhaub-thiab- raj kub exchangers / condensers | Welded | Qhov zoo tshaj plaws rau cov menyuam expansion; tus nqi- zoo |
| Large O.D. (>100mm) los yog nyias -phab ntsa daim ntaub ntawv | Welded | Seamless unavailable los yog kim heev nyob rau hauv loj qhov ntau thiab tsawg |
| Cov peev nyiaj -cov haujlwm tseem ceeb nrog kev xa khoom sai | Welded | Lub sij hawm luv luv thiab cov nqi qis dua |
Hoobkas
| Yam khoom | Yuav kuaj xyuas dab tsi |
|---|---|
| Billet / Coil Source | Traceable rau ntawv pov thawj titanium daim txhuam cev mills (VSMPO, ATI, los yog sib npaug) |
| Txias Pilger / Drawing Capacity | Qhov ntev tshaj plaws, OD ntau, thiab phab ntsa thickness raug |
| Vuam kab (rau welded raj) | Autogenous TIG nrog inert gas shielding ntawm ob qho tib si ID thiab OD |
| Annealing Rauv | Nqus los yog inert cua annealing los tiv thaiv oxidation nto |
| Qhov System | ISO 9001, ASME U-stamp (yog muaj), thiab PED 2014/68/EU |
Kev Tshawb Fawb & Kev Xeem
| Kuaj / Tshuaj xyuas | Lub hom phiaj | Muaj feem rau |
|---|---|---|
| Tshuaj ntsuam xyuas | Txheeb xyuas Ti Ntau dua lossis sib npaug rau 98.9%, O₂, Fe, C, N, H hauv GR2 txwv | Ob leeg |
| Tensile Test | Paub meej tias YS Ntau dua lossis sib npaug rau 275 MPa, UTS Ntau dua lossis sib npaug rau 345 MPa, Elongation Ntau dua lossis sib npaug li 20% | Ob leeg |
| Flattening Test | Tshawb xyuas ductility thiab soundness | Ob leeg |
| Flange / Rov qab Flange Test | Nthuav seam defects (tseem ceeb rau welded raj) | Welded nkaus xwb |
| Hydrostatic Test | Leak- pov thawj kev ncaj ncees ntawm 1.5 × tsim siab | Ob leeg |
| Eddy Current (ET) Test | Nthuav cov pinholes, tawg, thiab suav nrog nyob rau tag nrho ntev | Ob leeg |
| Kev kuaj Ultrasonic (UT) | xaiv tau; rau siab - cov ntawv thov tseem ceeb | Ob leeg |
| PMI (Positive Material Identification) | Txheeb xyuas qib ntawm txhua pob khoom | Ob leeg |
Tag nrho cov ntawv xeem tau muab tso ua ke rau hauv daim ntawv qhia txog Mill Test (MTR), traceable los ntawm cov xov tooj cua sov. Peb khaws cov qauv khaws cia rau 5 xyoos rau tag nrho traceability.
Ntim
| Ntim Kauj Ruam | Specification |
|---|---|
| Kev tiv thaiv sab hauv | Txhua lub raj kawg yog capped nrog yas plugs los tiv thaiv ingress ntawm noo noo thiab khib nyiab |
| Bundle Strapping | Cov raj yog bundled rau steel pallets nrog xeb- pov thawj banding; ntoo battens ntawm cov khaubncaws sab nraud povtseg tiv thaiv kev puas tsuaj |
| Waterproof Wrapping | Tag nrho cov pob qhwv hauv hnyav -lub luag haujlwm VCI (Vapor Corrosion Inhibitor) ntawv + ntau txheej ntawm PVC stretch zaj duab xis |
| Kev tiv thaiv sab nraud | Seaworthy ntoo crates lossis steel- cov thawv ntim rau cov thawv xa khoom |
| Kos npe | Clear stenciling: Qib (GR2), Spec (ASTM B338), Thaum tshav kub kub tsis muaj., Loj (OD × Phab ntsa), thiab Bundle Number |
| Cov ntaub ntawv hnab | Lub hnab dej tsis muaj dej txuas rau txhua lub crate uas muaj MTR, cov npe ntim khoom, thiab daim ntawv pov thawj tshuaj xyuas |
Tau Txais Cov Lus Qhia Ceev & Logistics Plan
FAQ
Q1: Cov welded raj puas tuaj yeem siv rau hauv cov dej hiav txwv txias?
A:kiag li. Qhov tseeb, welded GR2 raj yog cov qauv kev lag luam rau seawater -cooled condensers. Nrog rau kev ua kom zoo thiab kev kuaj ET, lawv ua tau zoo ib yam rau seamless hauv qhov kev pabcuam no.
Q2: Puas yog lub raj welded tsis muaj zog dua li lub raj seamless?
A:Cov niam txiv hlau muaj zog tib yam. Qhov kev sib koom ua haujlwm ntawm qhov sib txuas yog feem ntau 0.85 vs . 1.0 rau seamless. Qhov no txhais tau hais tias lub welded raj yuav tsum tau ib tug me ntsis thicker phab ntsa kom ua tau zoo tib yam tawg siab. Rau feem ntau qis - mus rau - nruab nrab siab kub exchanger lub luag hauj lwm, qhov no yog negligible.
Q3: Kuv tuaj yeem pom qhov txawv seamless los ntawm welded raj li cas?
A:Saib ntawm tus ID nto. Seamless raj feem ntau qhia me ntsis kauv qauv los ntawm lub pob zeb tho. Welded hlab muaj ib tug zoo meej ncaj, du ID Nyob rau hauv OD, weld seam yuav faintly pom tom qab ua tiav.
Q4: Ntev npaum li cas rau ASTM B338 GR2 raj?
A:Rau seamless, ntev ntev txog li 15 meters (nyob ntawm OD). Rau welded, peb muaj peev xwm muab tau mus txog 25 meters ncaj ntev, los yog coils rau me me diameters. Kev cai txiav ntev yog muaj raws li qhov kev thov.
Q5: Koj puas muab kev tshuaj xyuas thib peb -?
A:Yog lawm. Peb ua hauj lwm nrog SGS, BV, los yog TÜV rau ntawm -qhov chaw kuaj xyuas yog tias xav tau. Kev them nqi ntxiv, tab sis peb ua haujlwm tag nrho cov logistics.
Q6: Qhov txawv ntawm ASTM B338 thiab ASME SB338 yog dab tsi?
A:Chemically thiab dimensionally, lawv zoo tib yam. ASME SB338 yog Boiler & Pressure Vessel Code version rau code -stamped nkoj. Peb muab ob qho tib si nrog cov ntawv pov thawj tsim nyog.
