ASTM A312 TP317L Stainless Hlau Welded Yeeb Nkab: Muaj pes tsawg leeg thiab kev siv

ASTM A312 TP317L welded yeeb nkab yog dab tsi?

ASTM A312 TP317L yog qis-carbon molybdenum-cov kabmob austenitic stainless hlau yeeb nkab qib tau teev tseg hauv ASTM A312, tus qauv specification rau seamless, welded thiab hnyav hnyav ua haujlwm austenitic stainless hlau kav. Tsim UNS S31703, TP317L muaj 18.00-20.00% chromium, 11.00-15.00% npib tsib xee thiab 3.00-4.00% molybdenum, nrog carbon txwv rau 0.035% siab tshaj plaws. Kev sib xyaw ua ke ntawm molybdenum ntawm 3-4% thiab cov ntsiab lus qis heev muab TP317L ua rau muaj kev tiv thaiv zoo dua rau pitting, crevice corrosion thiab nres los ntawm ntau cov kua qaub tsawg dua li 316L tsev neeg, thaum khaws tag nrho cov weldability yam tsis muaj kev kho cua sov tom qab vuam.

Tshuaj muaj pes tsawg leeg (ASTM A312 TP317L)

Kev txwv tsis pub muaj ib qho ASTM A312 rau qib TP317L (UNS S31703), hauv qhov hnyav feem pua:

Element	Txwv (%)
Cov pa roj carbon (C)	0.035 max
Manganese (Mn)	max 2.00 Nws
Phosphorus (P)	0.045 max
Sulfur (S)	0.030 max
Silicon (Si)	max 1.00 Nws
Chromium (Cr)	18.00-20.00
Nickel (Ni)	11.00-15.00
Molybdenum (hli)	3.00-4.00
Nitrogen (N)	0.10 max

Mechanical Properties (Room Temperature)

Yam tsawg kawg nkaus txhua yam khoom yuav tsum tau los ntawm ASTM A312 rau TP317L hauv cov tshuaj -annealed mob:

Khoom	Tus nqi
Tensile zog	515 MPa min
Yield zog (0.2% offset)	205 MPa min
Elongation	35% min

Lub pitting kuj sib npaug tus lej (PREN=Cr + 3.3 Mo + 16 N) ntawm TP317L yog kwv yees li 30, uas zoo tshaj tus nqi ntawm 25 rau 316L thiab piav qhia nws tus cwj pwm zoo tshaj hauv cov tshuaj chloride - kabmob xov xwm.

Corrosion Resistance

TP317L tiv taus pitting thiab crevice corrosion nyob rau hauv chloride ib puag ncig zoo dua 316L, thiab nws ua tau zoo nyob rau hauv sulfuric thiab phosphoric acids ntawm nruab nrab concentrations thiab kub. Nws yog dav siv nyob rau hauv chlorine dioxide bleaching theem nyob rau hauv pulp mills, nyob rau hauv flue gas desulfurization (FGD) absorber internals, thiab nyob rau hauv dye, agrochemical thiab tshuaj nroj tsuag tuav nruj txheej txheem kwj. Hauv kev txo qis acids xws li kub concentrated hydrochloric acid, tsis muaj qib austenitic txaus, thiab siab dua - alloy lossis npib tsib xee- puag alloys yuav tsum tau txiav txim siab.

Manufacturing thiab Dimensional Range

TP317L welded yeeb nkab yog tsim los ntawm TIG welding (autogenous los yog txuam muab tub lim) los yog ERW, ua raws li tag nrho cov tshuaj annealing thiab pickling los yog ci tiav. Cov khoom welded yog tsim nyob rau hauv sab nraud diameters ntawm li 15 hli mus rau 800 hli nrog phab ntsa thicknesses ntawm 1.0 hli mus rau 12.0 hli; loj diameters thiab cov txheej txheem tshwj xeeb ntawm phab ntsa tuaj yeem tsim los ntawm kev tsim thiab vuam phaj. Longitudinal weld seams feem ntau yog 100% kev sim, thiab cov yeeb nkab tiav tau raug tshuaj xyuas tiv thaiv qhov ntev ntev ntawm ASTM A999 lossis cov khoom siv tshwj xeeb.

Tej kev siv

Cov txheej txheem tshuaj piping rau sulfuric, phosphoric thiab organic acid kev pabcuam.

Chlorine dioxide bleaching kab nyob rau hauv pulp thiab ntawv mills.

Flue gas desulfurization absorber internals thiab ductwork.

Cov khoom siv tshuaj thiab tshuaj zoo uas yuav tsum tau ua kom huv, weldable qis - cov yeeb nkab carbon.

Cov lus nug nquag

Dab tsi yog qhov txawv ntawm TP317 thiab TP317L?TP317 muaj cov ntsiab lus siab tshaj plaws ntawm 0.08%, thaum TP317L txwv cov pa roj carbon ntau rau 0.035% siab tshaj. Cov qib qis- carbon version tsis txhob hnov ​​​​qab thaum vuam, yog li TP317L tuaj yeem siv tau raws li -welded mob yam tsis muaj kev tshaj tawm -weld heat treatment.

Qhov kev pabcuam siab tshaj plaws ntawm TP317L yeeb nkab yog dab tsi?TP317L feem ntau yog corrosion- cov khoom qib; oxidation kuj nyob rau hauv huab cua yog txaus txog li 900 degrees C, tab sis tsim kub siab tshaj li ntawm 550 degrees C yuav tsum tau soj ntsuam tiv thaiv creep-tso cai kev nyuaj siab, thiab cov tsawg- carbon chemistry yog xaiv rau corrosion kev pab cuam es tsis yog rau siab kub siab zog.

Puas yog TP317L sib nqus?Tsis yog. TP317L yog tag nrho austenitic thiab qhov tseem ceeb tsis yog -magnetic nyob rau hauv cov mob annealed; Lub teeb magnetism tuaj yeem tshwm sim tom qab hnyav hnyav.

TP317L welded yeeb nkab ua li cas?Sawb lossis phaj yog yob- ua rau hauv lub tog raj kheej thiab koom nrog TIG lossis ERW vuam, tom qab ntawd cov yeeb nkab yog cov tshuaj annealed thiab pickled lossis ci tiav. Weld seam raug tshuaj xyuas thiab sim ua raws li cov cai ntawm ASTM A312.

Puas yog TP317L xav tau kev tshaj tawm -weld cua sov?Tsis yog. Qhov 0.035% cov ntsiab lus siab tshaj carbon khaws cov cua sov- thaj tsam cuam tshuam tsis muaj chromium carbide nag lossis daus, yog li cov welds feem ntau tau txais nyob rau hauv raws li -welded mob.

TP317L sib npaug li cas hauv lwm cov qauv?TP317L (UNS S31703) sib raug rau EN 1.4438 (X2CrNiMo18-15-4) thiab npog li phaj thiab ntawv hauv ASTM A240; JIS lub npe SUS317L ib JIS G4304/G4305 npog tib lub tsev neeg uas muaj cov pa roj carbon tsawg.