ASTM A312 TP304 npog dab tsi
ASTM A312 / A312M yog tus qauv kev qhia tshwj xeeb rau seamless, ncaj seam welded thiab hnyav hnyav ua haujlwm welded austenitic stainless hlau yeeb nkab npaj rau kub kub thiab kev pabcuam corrosive. TP304, nrog rau UNS xaiv S30400, yog qib siv dav tshaj plaws hauv qhov kev qhia tshwj xeeb thiab cov ntsiab lus siv rau cov kav dej corrosion.
TP304 yog 18-8 austenitic stainless hlau: nominally 18 feem pua chromium thiab 8 feem pua nickel, nrog cov ntsiab lus carbon tsawg thiab tsis muaj molybdenum ntxiv. Qhov kev sib npaug no muab kev ua haujlwm zoo rau ntau yam ntawm cov xov xwm me me corrosive, zoo heev formability thiab weldability, thiab pab tau lub zog ntawm ob qho tib si ambient thiab siab kub.
Chemical thiab Mechanical Requirements
| Element | Kev sib xyaw, feem pua |
|---|---|
| Cov pa roj carbon | 0.08 max |
| Manganese | max 2.00 Nws |
| Phosphorus | 0.045 max |
| Sulfur | 0.030 max |
| Silicon | 0.75 max |
| Nickel | 8.0-11.0 Nws |
| Chromium | 18.0-20.0 Nws |
| Khoom | Kev xav tau |
|---|---|
| Tsawg kawg tensile zog | 515 MPa (75,000 psi) |
| Tsawg tshaj tawm lub zog, 0.2 feem pua offset | 205 MPa (30,000 psi) |
| Tsawg kawg elongation | 35 feem pua hauv 50 mm lossis 2 in |
| Kev kho cua sov | Cov tshuaj annealed ntawm 1,040 C yam tsawg kawg nkaus thiab txias sai |
| Kev ntsuas siab lossis tsis yog -kev ntsuas kev puas tsuaj | Hydrostatic xeem los yog ib qho kev lees txais hluav taws xob lossis ultrasonic kuaj, raws li tau txiav txim |
Daim ntawv thov
Kev ua zaub mov thiab dej haus, qhov chaw uas tsis yog - ntxeem tau bore resists khoom tsim - thiab tu tshuaj.
Pharmaceutical thiab biotech txheej txheem kab, purified dej thiab huv utility circuits.
Chemical thiab petrochemical hloov kab, tshav kub exchangers thiab me me corrosive kev pab cuam.
Architectural handrails, structural trim thiab lub tsev pab pipework.
Kev kho dej, huab cua hauv hiav txwv raug thiab cov kav dej dav dav.
Fabrication thiab Selection Notes
TP304 tau yooj yim welded los ntawm cov txheej txheem arc feem ntau, thiab cov welded sib koom ib txwm khaws cov kev tiv thaiv corrosion txaus yam tsis muaj kev tshaj tawm -weld heat treatment. Ob peb lub ntsiab lus txiav txim siab qhov ua tiav ntawm kev teeb tsa.
Siv cov hlau tsis muaj cov pa roj carbon monoxide thiab tswj cov hluav taws xob hluav taws xob kom txwv tsis pub muaj kev kub ntxhov hauv thaj chaw tshav kub.
Ntxuav saum npoo tom qab vuam. Hlau kis kab mob los ntawm cov cuab yeej thiab kev sib tsoo cov plua plav yog ib qho ua rau muaj xeb ntxov ntxov.
Qhov twg muaj cov tshuaj chlorides, nco ntsoov tias tus qauv TP304 muaj kev cuam tshuam rau kev ntxhov siab corrosion tawg; qib molybdenum bearing feem ntau yog xaiv rau cov haujlwm ntawd.
Rau qhov kev pabcuam kub kub, paub meej tias cov qauv tsim tau poob rau hauv qhov tso cai rau kev ntxhov siab ntawm txoj cai tsim kho.
Qhia meej qhov kev xeem yuav tsum tau ntawm qhov kev txiav txim: hydrostatic test, los yog ib qho hluav taws xob los yog ultrasonic kuaj nyob rau hauv qhov chaw ntawm nws.
FAQ
Q: Qhov txawv ntawm TP304 thiab TP304L yog dab tsi?
TP304 muaj qhov siab tshaj plaws ntawm 0.08 feem pua thiab TP304L siab tshaj plaws ntawm 0.035 feem pua. Cov qib carbon qis txo qhov kev pheej hmoo ntawm rhiab heev tom qab vuam ntawm tus nqi qis zog me ntsis.
Q: Puas yog ASTM A312 yeeb nkab zoo ib yam li ASTM A312 / A312M?
Yog lawm. Qhov kev xaiv thib ob tsuas yog sau tseg tias qhov kev qhia tshwj xeeb muaj ob lub nti phaus thiab metric units.
Q: TP304 puas siv tau rau hauv dej hiav txwv?
Nws tiv taus atmospheric marine raug tab sis tsis pom zoo rau kev sib cuag dej hiav txwv txuas ntxiv, vim tias cov chlorides tuaj yeem ua rau pitting thiab kev ntxhov siab corrosion tawg.
Q: Yuav tsum tau kho cua sov li cas?
Cov yeeb nkab yog cov tshuaj annealed ntawm qhov tsawg kawg nkaus ntawm 1,040 C thiab txias sai sai kom cov carbides raug coj mus rau hauv cov tshuaj thiab cov khoom yog tag nrho austenitic.
Q: Qhov luaj li cas yog them?
A312 / A312M npog ntau yam ntawm cov yeeb nkab nominal qhov ntau thiab tsawg hauv cov txheej txheem phab ntsa tuab, thiab qhov ntev feem ntau raug txiav txim rau cov rooj siv ASME B36.19 lossis B36.10.
Q: Puas yog welded A312 yeeb nkab xav tau lub xov tooj cua?
Tsis yog los ntawm lub neej ntawd. Cov kev qhia tshwj xeeb yuav tsum muaj kev sim hydrostatic los yog kev tso cai hluav taws xob lossis kev kuaj xyuas ultrasonic, thiab cov duab hluav taws xob ntxiv yog qhov teeb meem rau kev yuav khoom.
