ASTM A268 TP444 Stainless hlau Heat Exchanger Tubes
Tso lus
Yog tias koj tab tom nrhiav stainless hlau tshav kub exchanger tubing uas ua ke zoo heev tiv thaiv chloride corrosion, siab thermal conductivity, thiab ib tug ntev kev pab cuam lub neej, ASTM A268 TP444 stainless hlau tubing yog undoubtedly ib tug zoo tagnrho xaiv. Raws li ib tug ferritic stainless hlau, nws yog dav siv nyob rau hauv daim ntawv thov xws li fais fab nroj tsuag, tshuaj ua, dej kho, automotive tso systems, thiab industrial tshav kub exchangers.
ASTM A268 TP444 Stainless Steel Heat Exchanger Tube yog dab tsi?
TP444 stainless hlau (UNS S44400) yog molybdenum -cov kabmob ferritic stainless hlau nrog cov ntsiab lus chromium ntawm kwv yees li 18% -20% thiab molybdenum cov ntsiab lus kwv yees li 1.75% -2.50%. Nws cov corrosion kuj rivals uas ntawm tej yam 300-series stainless hlau, thaum muab superior tsis kam rau chloride kev nyuaj siab corrosion cracking.
Nrog 18 xyoo dhau los ntawm kev xa tawm cov hlau stainless hlau kub exchanger raj, GNEE muab cov khoom raws li ASTM, ASME, EN, thiab JIS cov qauv. Txhawb kev lag luam cov ntsiab lus xws li FOB, CIF, thiab DDP, peb muab kev ruaj khov thiab txhim khu kev qha stainless hlau tubing kev daws teeb meem rau cov tuam txhab lag luam thoob ntiaj teb ntawm boilers, lub zog hluav taws xob, cov khoom siv tshuaj, thiab cov khoom siv hluav taws xob.
GNEE muaj ntau yam khoom lag luam, suav nrog ASTM A268 TP444 seamless raj, welded raj, U-khoov raj, raj ncaj, coiled tubing, thiab kev cai -engineered heat exchanger tubes fabricated precisely rau cov neeg siv kos duab. TP444 yog ib qho ultra- carbon qis, siab -chromium ferritic stainless hlau. Los ntawm cov tshuaj annealing, residual processing stresses yog tag nrho relieved, kom ib tug du, uniform deg tag dawb ntawm nplai, tawg, los yog pom khawb. Qhov zoo tshaj plaws no ua tau raws li cov neeg siv khoom siv hluav taws xob hloov hluav taws xob 'kev xav tau nruj rau kev pom kev hloov hluav taws xob zoo thiab kev huv huv tshwj xeeb.
Nyob rau hauv cov nqe lus ntawm qhov ntev precision thiab kam rau ua kev tswj, GNEE's ASTM A268 TP444 Stainless Steel Heat Exchanger Tubesfeem ntau npog ib txoj kab uas hla (OD) ntau ntawm 6 hli mus rau 168.3 hlithiab phab ntsa thickness (WT) ntau ntawm 0.5 hli mus rau 12 hli. Peb nruj me ntsis tswj OD thiab WT kam rau ua raws li tus neeg siv khoom tsim. Kev xa khoom muaj xws li Bright Annealed (BA)thiab Annealed & Pickled (AP)ua tiav.
Hais txog kev tiv thaiv corrosion, TP444 stainless hlau tubing muab kev ua tau zoo tshaj plaws tiv thaiv pitting thiab crevice corrosion nyob rau hauv chloride ib puag ncig piv rau cov qauv ferritic qib xws li TP409 thiab TP439. Nrog PREN (Pitting Resistance Equivalent Number) ntawm kwv yees li 23–26, uas yog sib npaug nrog qee yam TP316L cov ntaub ntawv, TP444 yog qhov tsim nyog rau seawater heat exchangers, condensing systems, chemical processing, food handle, and a wide array of industrial heat transfer applications.
ASTM A268 TP444 Stainless hlau sib npaug qib
| Txuj | Qib |
|---|---|
| ASTM | TIAB SA 444 |
| UNS | S44400 |
| EN | 1.4521 |
| JIS | SUS 444 |
| GB / T | 022Cr19Mo2 |
Tshuaj muaj pes tsawg leeg ntawm ASTM A268 TP444 Stainless hlau yeeb nkab
| Lub ntsiab | C | Mn | P | S | Si | Cr | Ni | Mo | N | Ti + Cb (Nb) |
|---|---|---|---|---|---|---|---|---|---|---|
| Kev sib xyaw (wt.%) | 0.025 max | max 1.00 Nws | 0.040 max | 0.030 max | max 1.00 Nws | 17.5 – 19.5 | max 1.00 Nws | 1.75 – 2.50 | 0.035 max | 0.20 + 4(C + N) min; 0.80 max |
ASTM A268 TP444 yeeb nkab Mechanical Properties
| Khoom | Tus nqi (Metric) | Tus nqi (Imperial) |
| Tensile zog, min. | 415 MPa rau | 60 ksg |
| Yield zog (0.2% Offset), min. | 275 MPa rau | 40 ksg |
| Elongation hauv 2 nti. (50mm), min. | 20% | 20% |
| Hardness (Rockwell B), max. | 90 PAB | 90 PAB |
| Hardness (Brinell), max. | 190 HWB | 190 HWB |
ASTM A268 yeeb nkab Dimensional Tolerances
Txheem tolerances rau Sab Nraud Diameter (OD) thiab Phab Ntsa Thickness (WT).
| Sab nraud Diameter (OD) Range | OD Tolerance | Phab ntsa Thickness (WT) kam rau ua |
| < 1/2" (12.7 mm) | ± 0.005 "(0.13 hli) | ± 15% |
| 1/2 "mus rau 1-1/2" (12.7-38.1 hli) | ± 0.005 "(0.13 hli) | ± 10% |
| >1-1/2 "mus rau 3-1/2" (38.1-88.9 mm) | ± 0.010 "(0.25 hli) | ± 10% |
| Txheem Length Tolerance | + 1/8" (3 hli), -0 |
ASTM A268 TP444 Stainless Hlau Round Tubes Daim Ntawv Thov
Thaum tshav kub kub Exchangers: Plhaub thiab raj exchangers nyob rau hauv dej cua sov systems.
Fais fab tiam: Condenser raj
Solar Collectors: Absorber tubes thiab lub tank dej kub.
Automotive: Exhaust systems thiab catalytic converter Cheebtsam.
Kev Kho Dej: Desalination thiab potable dej piping.
Yog tias koj xav tau kev pab, thov qhia rau kuv:
Dab tsi sab nraud thiab phab ntsa thickness koj xav tau?
Puas yog koj tab tom nrhiav seamless lossis welded raj?
Daim ntawv thov lossis kev lag luam yog dab tsi?
HS Codes rau ASTM A268 TP444 Tubes
| Yam khoom | HS Code (General) |
| ASTM A268 TP444 Seamless Tubes | 7304.41 |
| ASTM A268 TP444 Welded Tubes | 7306.40 |
| ASTM A268 TP444 U-Bent Tubes | 7304.41 / 7306.40 |
ASTM A268 TP444 Tube Nqe List
| Yam khoom | Specification (OD x WT) | Tus nqi kwv yees (USD / MT) | Kev Sau Ntawv |
| Welded Tube (Standard) |
OD: 19.05 - 38.1 mm WT: 1.0 - 2.5 mm |
$3,200 – $3,800 | Bright Annealed, Eddy Current Tested. |
| Seamless Tube |
OD: 12.7 - 50.8 mm WT: 1.5 - 4.0 mm |
$4,500 – $5,500 | Cold drawn, Thaum tshav kub kub kho, Pickled. |
| U-Bent Tubes | Per Client Drawing | $3,800 – $4,800 | suav nrog dabtsi yog khoov thiab kev ntxhov siab-relief annealing ntawm khoov. |
Yog tias koj muaj qhov yuav tsum tau ua rau TP444 stainless hlau tshav kub exchanger raj, peb txais tos koj xaj. GNEE tuav cov khoom lag luam loj ntawm cov khoom nrov rau koj xaiv. Thov hu rau peb lub Hoobkas hnub no; peb muab cov nqi sib tw thiab kev pabcuam zoo heev.
Technical Requirements & Testing
| Qeb xeem | Kev piav qhia |
| Kev kho cua sov | Annealing ntawm 1450℃F (790 degree) yam tsawg kawg nkaus, ua raws li qhov txias txias. |
| Flaring Test | Tsis muaj kab nrib pleb lossis flaws thaum flared raws li ASTM A1016. |
| Flange Test | Yuav tsum tau rau tej diameters los xyuas kom meej ductility. |
| Hardness Test | Ua rau ntawm ib qho qauv ntawm txhua qhov ntau. |
| Hydrostatic / Eddy Tam sim no | 100% Tsis yog -Kev Ntsuas Kev Ua Phem (NDT) xav tau rau kev siab ncaj ncees. |
| Intergranular Corrosion | Yuav tsum xeem dhau ASTM A763 Xyaum W lossis Z. |
GNEE muab EN 10204 3.1 Cov Khoom Siv Xeem Ntawv Pov Thawj (MTC) rau txhua pawg ntawm ASTM A268 TP444 cov khoom siv hluav taws xob kub sib txawv, kom ntseeg tau tias muaj cov tshuaj lom neeg muaj pes tsawg leeg, cov xov tooj cua sov, cov khoom siv kho tshuab, thiab ua raws li cov qauv kev cai; qhov no yuav pab cov neeg yuav khoom txheeb xyuas cov khoom muaj tseeb thiab txo qhov kev pheej hmoo ntawm cov khoom siv tsis ua haujlwm los ntawm cov khoom tsis raug cai -.
High- ntim khoom hiav txwv zoo
| Ntim Hom | Kev piav qhia |
|---|---|
| Ntoo Crate (Standard) | Export-qib fumigated ntoo crates lossis plywood thawv yog siv los npaj thiab ruaj ntseg cov raj zoo zoo. Kev txhawb nqa sab hauv tiv thaiv kev txav mus los thiab kev puas tsuaj thaum thauj. |
| Hexagonal Bundling | Cov raj tau ntim rau hauv cov duab hexagonal siv cov hlua steel lossis nylon bands, tom qab ntawd npog nrog cov ntaub qhwv, yas zaj duab xis, lossis cov khoom siv tsis muaj dej. |
| U-Bent Tube Ntim | Tshwj xeeb tsim cov ntoo thav duab lossis cov thawv ntoo yog siv los kho thiab tiv thaiv U-khoov seem ntawm cov raj cua sov. |
FAQ
Q: Dab tsi yog qhov zoo ntawm TP444 tshaj 316L hauv kev siv hluav taws xob sib hloov?
A: Qhov txiaj ntsig tseem ceeb tshaj plaws yog nws txoj kev tiv thaiv kev ntxhov siab corrosion tawg (SCC).
TP444 feem ntau muaj PREN (Pitting Resistance Equivalent Number) ntawm 24–25 thiab muaj kev tiv thaiv zoo rau kev ntxhov siab corrosion tawg hauv chloride- thaj chaw nplua nuj. Hauv qhov sib piv, 316L feem ntau muaj PREN ntawm 23-24 thiab muaj kev cuam tshuam rau kev ntxhov siab corrosion tawg nyob rau hauv muaj cov chlorides ntawm qhov kub siab tshaj 60 degree.
Q: Puas yog TP444 stainless hlau hlau nplaum?
A: Yog. TP444 yog ferritic stainless hlau nrog lub cev -centered cubic (BCC) crystal qauv. Tsis zoo li 304 lossis 316, TP444 yog cov hlau nplaum sib nqus.
Q: Qhov kev pabcuam siab tshaj plaws rau TP444 yog dab tsi?
A: Rau siab-cov kabmob xws li cov raj xa hluav taws xob, qhov kev pabcuam txuas ntxiv tau pom zoo yog feem ntau txwv rau 315℃(600℃F).
Q: Vim li cas TP444 feem ntau siv nyob rau hauv lub hnub ci dej rhaub thiab cov dej kub cia tank?
A: Vim tias cov tshuab no feem ntau ua haujlwm ntawm qhov kub thiab txias (60℃-90 degree) siv cov dej "khaus" hauv nroog (muaj cov chlorides). Raws li cov xwm txheej zoo li no, tubing ua los ntawm 304 lossis 316 feem ntau ua tsis tiav hauv 1-2 xyoos vim yog pitting lossis kev ntxhov siab corrosion tawg (SCC). TP444 muaj cov kev daws teeb meem nrog lub sijhawm ntev tshaj - lub sij hawm corrosion kuj thiab ruaj khov tus nqi (raws li nws tsis muaj npib tsib xee).
