ASTM B338 Titanium Qib 1 Tube: Specifications thiab Daim Ntawv Thov
Apr 14, 2026
ASTM B338 yog tus qauv tswj hwm rau seamless thiab welded titanium raj siv nyob rau hauv condensers thiab tshav kub exchangers, thiab Qib 1 yog softest, feem ntau ductile qib nws npog. Tsim UNS R50250, Qib 1 raj ua ke lub zog tensile ntawm 240 MPa yam tsawg kawg nkaus nrog elongation ntawm 24% yam tsawg kawg nkaus, ua rau nws yooj yim tshaj titanium raj rau khoov, flare, thiab txias daim ntawv. Vim tias nws yog cov khoom lag luam ntshiab titanium, nws tsim tus kheej - kho oxide zaj duab xis uas ua rau muaj kev tiv thaiv zoo rau dej hiav txwv, chlorides, thiab oxidizing media. Qhov kev sib xyaw ua ke no piav qhia nws txoj kev siv dav hauv cov khoom siv hluav taws xob sib pauv, cov kab cua txias hauv hiav txwv, thiab siab - cov txheej txheem purity piping.
Sib npaug Cov Qauv
| Txuj | Lub npe |
|---|---|
| ASTM B 338 Cov | Qib 1 (titanium raj) |
| UNS | R50250 |
| DIN / W-Nr. | 3.7025 |
| ISO 5832-2 | Qib 1 (cov khoom siv phais phais) |
| ASTM B265 / ASME SB265 | Qib 1 (phaj, ntawv, sawb) |
Tshuaj muaj pes tsawg leeg rau ASTM B338
Cov kev txwv muaj xws li titanium tshuav nyiaj li cas, hlau 0.20% siab tshaj plaws, oxygen 0.18% siab tshaj, carbon 0.08% siab tshaj, nitrogen 0.03% siab tshaj, thiab hydrogen 0.015% siab tshaj. Qhov qis oxygen txwv, 0.18%, yog dab tsi muab Qib 1 nws qhov tshwj xeeb ductility thiab formability piv nrog Qib 2, uas tso cai rau 0.25% oxygen.
Mechanical thiab Physical Properties
| Khoom | Tus nqi |
|---|---|
| Tensile zog | 240 MPa yam tsawg kawg nkaus |
| Yield zog (0.2% offset) | 138-310 MPa |
| Elongation | 24% yam tsawg kawg nkaus |
| Qhov ntom | 4.51 g / cm³ |
| Melting point | txog 1670 degree |
| Beta transus | 888 ± 4 degree |
| Thermal conductivity ntawm 20 degree | 16 W/m·K |
Ntawm 4.51 g / cm³, Qib 1 raj yog kwv yees li ib nrab ntawm qhov hnyav ntawm npib tsib xee-raws li alloy raj ntawm tib qhov ntev, uas yog ib qho kev txiav txim siab nyob rau hauv loj exchanger bundles thiab offshore qauv.
Tej kev siv
Kev ua tshuaj lom neeg: kub exchanger thiab condenser tubing, reactor coils, thiab piping rau chloride -cov kabmob thiab oxidizing media
Marine engineering: seawater txias kab, ballast system tubing, thiab desalination raj bundles
Kev lag luam kws tshuaj: siab - cov dej ntshiab huv thiab cov kua dej hloov mus
Kev kho mob thev naus laus zis: kev phais ntsuas tubing thiab cov khoom siv hauv ASTM F67
Kev tsim hluav taws xob: cov kav dej hauv qhov chaw uas cov dej hiav txwv yog qhov cua txias nruab nrab
Kev Taw Qhia Fabrication
Qib 1 raj tuaj yeem ua tau txias khoov, flared, thiab flanged nrog qis springback; mandrel dabtsi yog khoov yog pom zoo rau nruj radii tiv thaiv kinking. Vuam los ntawm GTAW los yog GMAW yog ncaj nraim, tab sis lub weld cheeb tsam thiab lub hauv paus sab yuav tsum tau shielded nrog argon vim titanium absorbs oxygen thiab nitrogen saum toj no txog 400 degree, uas embrittles sib koom tes. Rau qhov siab tshaj plaws ductility tom qab vuam, ncej-weld anneal ntawm 650-700℃tom qab cua txias yog siv. Cov kev xaiv uas tsis muaj kev puas tsuaj muaj xws li ultrasonic, eddy tam sim no, thiab hydrostatic kuaj ib ASTM B338.
Zoo thiab Ntawv Pov Thawj
Cov khoom xa tuaj rau ASTM B338 yuav tsum nqa daim ntawv pov thawj zeb kuaj ib qho EN 10204 Hom 3.1, traceable rau cov cua sov, nrog rau tshuaj ntsuam xyuas thiab tensile tau. Rau cov welded raj, xyuas kom meej tias thaj tsam weld ua tau raws li qhov kev sib tw thiab kev sib tw ntawm tus qauv, thiab paub meej tias cov khoom xa tuaj tiag tiag, feem ntau yog annealed lossis txias- ua haujlwm kev ntxhov siab-relieved.
FAQ
Dab tsi yog qhov txawv ntawm Qib 1 thiab Qib 2 raj rau ASTM B338?
Qib 1 muaj 240 MPa lub zog tensile yam tsawg kawg nkaus thiab 24% elongation, thaum Qib 2 muaj 345 MPa thiab 20%. Qib 1 yooj yim rau daim ntawv txias thiab khoov; Qib 2 haum rau siab- cov kabmob uas xav tau lub zog ntxiv me ntsis.
UNS R50250 sib npaug li cas?
UNS R50250 yog sib npaug rau ASTM B338 Qib 1, DIN 3.7025, ISO 5832-2 Qib 1 rau kev cog qoob loo, thiab ASTM B265 Qib 1 rau phaj thiab ntawv. Tag nrho cov xa mus rau CP titanium nrog 0.18% siab tshaj oxygen.
Qib 1 titanium raj puas siv tau rau hauv dej hiav txwv?
Yog lawm. Nws yog ib qho ntawm cov dej hiav txwv tshaj plaws -kev ua haujlwm siab ua haujlwm siab, nrog rau qhov tsis zoo ntawm kev xeb thiab muaj zog tiv thaiv rau pitting thiab crevice nres hauv ambient- qhov kub chloride kev pabcuam.
Qhov kev pab kub siab tshaj plaws rau Qib 1 raj yog dab tsi?
Kev pabcuam txuas ntxiv mus txog li 300℃yog qhov ua tau zoo hauv dej hiav txwv thiab oxidizing media. Tshaj ntawd, oxidation accelerates thiab creep zog ua limiting; siab dua - qib zog lossis alloys tau teev tseg.
Puas yog Qib 1 raj tsim nyog rau cov tshuab dej tshuaj?
Yog lawm. Nws muaj kev tiv thaiv corrosion, tsis yog -toxicity, thiab tsis yog- tus cwj pwm sib nqus ua tau raws li cov kev xav tau ntawm siab - dej huv huv, thiab nws ua raws li ISO 5832-2 purity yuav tsum.
Dab tsi ntawm phab ntsa thickness kam rau ua siv rau welded Qib 1 raj?
ASTM B338 phab ntsa tuab tolerances tsis siv rau ntawm vuam seam ntawm welded raj; thaj chaw weld raug soj ntsuam los ntawm flattening, flaring, thiab tsis yog -kev kuaj kev puas tsuaj. Dimensional tolerances rau tus so ntawm lub raj ua raws li cov qauv rooj.
