316H stainless hlau kav, tnws "H" hauv 316H sawv ncaj qha raucarbon siab. Txawm hais tias kev tsim cov txheej txheem dav dav feem ntau nyiam tsawg - carbon variants kom txo tau cov teeb meem vuam, nce siab - qhov kub thiab txias yuav tsum muaj qhov sib txawv ntawm cov tshuaj profile kom muaj kev ncaj ncees nyob rau hauv kev thauj khoom. HT PIPE is aSS316h cevtus xa khoom nrog 15+ kev xa tawm.Tiv tauj pebkom paub ntau ntxiv thiab quotes dawb!
Chemical Composition Breakdown
Qhov txawv feature ntawm 316H yog nws nruj nruj tswj qhov rais. Qhov twg tus qauv 316 tso cai rau cov ntsiab lus siab tshaj plaws ntawm 0.08%, thiab 316L txwv nws mus rau 0.03%, 316H tswj hwm ntau yam ntawm0.04% rau 0.10%.
| Element | Qhov hnyav (%) |
| Cov pa roj carbon (C) | 0.04 – 0.10 |
| Chromium (Cr) | 16.00 – 18.00 |
| Nickel (Ni) | 10.00 – 14.00 |
| Molybdenum (hli) | 2.00 – 3.00 |
| Manganese (Mn) | Tsawg dua lossis sib npaug li 2.00 |
| Silicon (Si) | Tsawg dua lossis sib npaug li 0.75 |
Txheem Specifications
ASTM A312 / ASME SA312 Cov Lus Qhia:Tus qauv ntsuas rau seamless, ncaj-seam welded, thiab hnyav hnyav- ua haujlwm austenitic stainless hlau kav npaj rau siab - kub thiab kev pabcuam corrosive.
ASTM A213 / ASME SA213 Cov Lus Qhia:Npog seamless ferritic thiab austenitic steel boiler, superheater, thiab cua sov- cov raj xa dej.
ASTM A358 / ASME SA358 Cov Lus Qhia:Siv rau hluav taws xob -fusion-welded (EFW) austenitic chromium-nickel alloy steel yeeb nkab haum rau siab - kub, siab - kev ua haujlwm siab.
Seamless vs. Welded 316H Pipes
Seamless Pipes (1/2 "NB txog 24" NB):Tsim los ntawm kub extrusion los yog rotary tho yam tsis muaj longitudinal weld seam. Seamless 316H tau txais kev pom zoo rau qhov tseem ceeb, siab - siab refinery kab thiab headers vim nws tshem tawm txoj kev pheej hmoo ntawm weld - seam weld deficiencies thiab yooj yim ua raws li ASME kev sib koom ua haujlwm cov cai (E=1.0).
Welded / EFW Pipes (6 "NB txog 100" + NB):Tsim los ntawm dov 316H phaj thiab siv tsis siv neeg fusion vuam txoj kev. Rau cov kab loj - txoj kab uas hla txoj kab uas hla kev khiav hauj lwm ntawm qhov nruab nrab siab, welded 316H muab cov phab ntsa tuab tuab heev thiab txo cov nqi yuav khoom.
Fabrication, Vuam, thiab Installation Considerations
Ua hauj lwm nrog 316H yuav tsum tau tshwj xeeb fabrication cov txheej txheem los xyuas kom meej nws siab - kub yam tsis muaj kev cuam tshuam thaum lub installation.
Welding Precautions thiab Sensitization Risks
Vim tias 316H muaj cov pa roj carbon ntau dua, vuam ua rau muaj qhov tshwm sim metallurgical hu uakev xavnyob rau hauv lub tshav kub - cuam tshuam cheeb tsam (425℃rau 850℃). Chromium carbides precipitate raws cov ciam teb nplej, tawm hauv cov cheeb tsam uas nyob ib sab depleted ntawm chromium. Yog hais tias sab hauv ntawm cov yeeb nkab tau raug aggressive aqueous acids thaum lub sij hawm downtime los yog tu, nws muaj peev xwm undergo sai intergranular corrosion.
Txhawm rau txo qhov kev pheej hmoo no thaum lub sij hawm tsim teb:
- Khaws cov cua kub tawm kom tsawg thiab saib xyuas qhov kub ntawm qhov sib cuam tshuam (tsawg dua lossis sib npaug li 150 degree).
- Siv cov khoom sib txuam siab - carbon filler metals (piv txwv li, ER316H lossis E316H) kom ntseeg tau tias thaj chaw weld sib phim rau qhov nkag ntawm cov yeeb nkab niam txiv.
- Tsis txhob oxyacetylene vuam; lo rau roj tungsten arc vuam (GTAW/TIG) los yog roj hlau arc vuam (GMAW/MIG) kom huv si weld deposits nrog tsawg porosity.
Tshaj tawm -Kev kho cua sov (PWHT)
Rau hnyav-phab ntsa 316H piping khiav hauj lwm nyob rau hauv cyclic thermal tej yam kev mob, ib tug ncej-weldtshuaj annealingKev kho mob feem ntau pom zoo. Tshav kub cov khoom siv hluav taws xob rau 1040℃- 1150℃tom qab los ntawm cov dej nrawm nrawm los yog yuam kom cua txias dissolves cov chromium carbides rov qab rau hauv cov khoom siv. Cov txheej txheem no rov kho cov yeeb nkab lub hauv paus corrosion kuj thiab txo cov kev ntxhov siab sab hauv los ntawm kev sib sau txias los yog vuam.
Kev Ua Haujlwm Zoo thiab Kev Xeem Ua Haujlwm
Positive Material Identification (PMI):Kev txheeb xyuas teb siv X-ray fluorescence (XRF) lossis optical emission spectrometry (OES) kom paub meej tias cov pa roj carbon concentration poob hauv qhov xav tau 0.04% mus rau 0.10%.
Tsis yog -Kev Tshawb Fawb Kev Ua Phem (NDE):Radiographic Testing (RT) los yog Ultrasonic Testing (UT) hla tag nrho ntev ntawm welded seams los xyuas seb subsurface flaws lossis tsis muaj kev nkag mus.
Intergranular Corrosion Testing:Kev ntsuas cov qauv tsim khoom ntawm ASTM A262 Xyaum A lossis E txhawm rau txheeb xyuas cov kev xav tau ua ntej muab cov kav dej tso rau hauv kev pabcuam.
Hydrostatic Validation:Subjecting kawg piping spools rau kev ntsuam xyuas siab (feem ntau 1.5 qhov siab tshaj plaws tso cai ua hauj lwm siab) los xyuas cov neeg kho tshuab ntsaws ruaj ruaj thiab sib koom ua ke stability.
