Ob Nickel-Chromium Bars los ntawm Tib Tsev Neeg
Alloy 600 (UNS N06600) thiab Alloy 625 (UNS N06625) yog ob qho ntawm cov khoom siv ntau tshaj plaws npib tsib xee-chromium bar qib nyob rau hauv tshav kub thiab corrosion resistant khw. Lawv los ntawm tib tsev neeg hlau, lawv yog ob qho tib si austenitic thiab ob qho tib si tau muab los ua puag ncig, tab sis lawv raug xaiv rau ntau yam sib txawv. Alloy 600 yog cov neeg ua haujlwm rau siab -kub oxidation tsis kam thiab tiv thaiv chloride kev nyuaj siab corrosion tawg ntawm ib nrab lub zog. Alloy 625 ntxiv molybdenum thiab niobium rau tib lub npib tsib xee -chromium puag, uas txhawb nqa lub zog, nce corrosion kuj hauv kev txo qis thiab chloride-cov kabmob xov xwm, thiab thawb tus nqi nce siab.
Ob qib muaj nyob rau hauv ntau hom ntawv bar thiab tiav, thiab ob qho tib si tuaj yeem muab nkag rau hauv cov khoom siv annealed, kub ua hauj lwm los yog txias drawn mob nyob ntawm txoj kab uas hla thiab qhov yuav tsum tau tolerances.
| Bar daim ntawv | Hom loj ntau yam | Sau ntawv |
|---|---|---|
| Round bar, kub dov los yog forged | Txoj kab uas hla 3-800 mm | Peeled los yog tig rau kev ua siab ntev |
| Round bar, txias kos | Txoj kab uas hla 3-100 mm | Tight kam rau ua, ci tiav |
| Hexagonal bar | 2-100 mm nyob rau hauv flats | Rau fasteners thiab valve qhov chaw |
| Pav ca | Thickness 2-100 hli, dav 10-500 hli | Machined los ntawm phaj los yog forged |
Chemical Composition piv
Qhov sib txawv ntawm ob qib piav qhia yuav luag txhua qhov sib txawv ntawm cov khoom sib tham hauv qab no. Qhov tseem ceeb yog qhov hnyav feem pua, muab los ntawm cov kev qhia tshwj xeeb ASTM B166 rau Alloy 600 thiab ASTM B446 rau Alloy 625.
| Element | Hlau alloy 600 (N06600) | Alloy 625 (N06625) |
|---|---|---|
| Nickel, Nia | 7 2,0mn | 5 8,0mn |
| Chromium, Cr | 14.0–17.0 | 20.0–23.0 |
| Hlau, Fe | 6.0–10.0 | 5.0 max |
| Molybdenum, Mo | – | 8.0–10.0 |
| Niobium plus tantalum, Nb + Ta | – | 3.15–4.15 |
| Carbon, C | 0.15 max | 0.10 max |
| Manganese, Mn | max 1.00 Nws | 0.50 max |
| Silicon, Sib | 0.50 max | 0.50 max |
| tooj, Cu | 0.50 max | – |
| Aluminium, Al | – | 0.40 max |
| Titanium, TSI | – | 0.40 max |
| Cobalt, Co | – | max 1.00 Nws |
| Sulfur, S | 0.015 max | 0.015 max |
Alloy 625 yog npib tsib xee-chromium- qib molybdenum nrog niobium ntxiv rau tantalum ua lub zog txhawb zog, tsim kom muaj kev sib kis zoo ntawm gamma-ob npaug- theem tseem ceeb uas ruaj khov nyob rau hauv qhov kub thiab txias. Alloy 600 tso siab rau cov khoom siv- kev daws teeb meem thiab cov ntsiab lus siab nickel rau nws cov tshuaj tiv thaiv; nws tsis muaj molybdenum, yog li nws tsis yog npaj rau kev txo qis acids.
Mechanical Properties thiab Temperature Capability
| Khoom (annealed bar) | Hlau alloy 600 (N06600) | Alloy 625 (N06625) |
|---|---|---|
| Tensile zog | 550 MPa (80 ksi) min | 830 MPa (120 ksi) min |
| Yield zog, 0.2% offset | 240 MPa (35 ksi) min | 415 MPa (60 ksi) min |
| Elongation hauv 50 mm | 30% min | 30% min |
| Tsim siv ntau yam | Los ntawm cryogenic kub txog 1093℃hauv oxidising kev pab cuam | Los ntawm cryogenic kub txog li 980℃txuas ntxiv, siab dua rau luv luv |
| Kub ua haujlwm ntau yam | Txog 870-1230 degree | Txog 870-1170 degree |
Alloy 625 muab kwv yees li tsib caug feem pua yuav muaj zog ntau dua li Alloy 600 nyob rau hauv cov mob annealed, thiab nws khaws ib feem loj ntawm lub zog ntawd thaum kub nce. Rau bar siv los ua bolting, valve stems los yog siab -load structural qhov chaw, lub zog ntxiv ntawm Alloy 625 feem ntau tso cai rau tus ntoo khaub lig me me -section thiab yog li ntawd qhov hnyav dua. Alloy 600 compensates nrog zoo ductility ntawm cryogenic kub, tsawg rhiab heev rau thermal qaug zog nyob rau hauv thermal cycling lub luag hauj lwm, thiab tus nqi qis dua ib kilogram, uas tseem ceeb nyob rau hauv loj bar ntau.
Corrosion, Oxidation thiab High -Chloride Cwj Pwm
Ob qib tiv thaiv oxidation thiab scaling nyob rau hauv huab cua ntawm qhov kub thiab txias, thiab ob leeg zam chloride kev nyuaj siab corrosion cracking deb zoo dua li cov pa austenitic stainless hlau. Qhov sib txawv tshwm sim thaum ib puag ncig ua tshuaj lom neeg.
Siab -chloride thiab marine ib puag ncig:Alloy 625 yog qhov kev xaiv muaj zog dua. Nws cov ntsiab lus molybdenum ntawm 8-10% resists chloride pitting thiab crevice corrosion, yog li nws yog siv rau offshore hardware, seawater-exposed valve trim thiab marine fasteners.
Oxidation ntawm qhov kub thiab txias:Alloy 625 resists oxidation zoo dua Alloy 600 vim nws nqa ntau chromium ua ke nrog molybdenum siab dua, tso cai rau nws kom muaj sia nyob qhov kub thiab txias hauv oxidising gas ntws.
Kev pabcuam Caustic thiab alkaline:Alloy 600 ua tau zoo heev nyob rau hauv caustic soda thiab lwm yam alkaline xov xwm, uas yog ib tug yog vim li cas nws yog siv nyob rau hauv cov tshuaj thiab nuclear industries.
Txo cov kua qaub:Alloy 625 resists hydrochloric thiab lwm yam kev txo cov kua qaub tawm zoo dua li Alloy 600, uas tsis muaj molybdenum.
Kev pabcuam qaub:Alloy 625 tau hais dav dav rau cov roj thiab roj li qub thiab cov khoom siv yuav tsum tau ua raws li NACE MR0175 / ISO 15156, qhov twg nws qib siab zog tau txais ntawm qhov sib npaug siab dua qhov kev tso cai hardness dua Alloy 600.
Fabrication, Vuam thiab Sib Nqus Teb
Alloy 600 tsis yog tsuas yog ua haujlwm tau xwb tab sis qhov tseeb weldable los ntawm tag nrho cov txheej txheem, thiab nws txoj kev siv vuam yog ncaj nraim rau cov npib tsib xee - raws qib: cov cua kub qis, cov ntsej muag huv si, thiab cov npib tsib xee zoo sib xws - chromium muab tub lim hlau ib txwm txaus, tsis muaj kev tshaj tawm -weld kev kho cua sov yuav tsum tau siv rau feem ntau. Alloy 625 kuj tau yooj yim welded, thiab nws zam cov roj tungsten arc, roj hlau arc thiab plasma arc txheej txheem. Nws qhov nyuaj dua yog qhov txiaj ntsig hauv kev pabcuam thiab muaj teeb meem hauv lub khw muag khoom, qhov uas nws xav tau kev teeb tsa nruj, cov cuab yeej ntse thiab txiav hnyav dua li Alloy 600.
Ntawm cov lus teb sib nqus, ob qib yog austenitic thiab qhov tseem ceeb tsis yog -magnetic nyob rau hauv cov mob annealed, uas yog vim li cas lawv thiaj li siv qhov sib nqus permeability yuav tsum nyob ze ntawm qhov chaw dawb. Kev ua haujlwm txias lossis kev ua haujlwm hnyav tuaj yeem ua rau muaj qhov sib nqus me me hauv cov txheej txheem ntawm ob qib. Ob qib kuj tiv taus galling zoo dua stainless hlau bolting, thiab Alloy 600 tshwj xeeb sib xyaw ua ke siab - qhov kub thiab txias zog nrog kev ntxhov siab zoo, yog li cov pob qij txha preloaded tuav lawv cov clamp ntev ntawm qhov kub thiab txias.
Cov lus nug nquag
Q: Dab tsi yog UNS tus lej ntawm Alloy 600 thiab Alloy 625 bar?
Alloy 600 yog UNS N06600 thiab Alloy 625 yog UNS N06625. Cov ntaub ntawv khoom lag luam tau teev tseg raws li ASTM B166 thiab ASTM B446 feem, nrog rau ASME SB-166 thiab SB-446 specifications siv rau cov khoom siv siab.
Q: Puas yog Alloy 600 round bar sib nqus?
Nyob rau hauv lub annealed mob Alloy 600 yog austenitic thiab zoo tsis yog -magnetic nyob rau hauv chav tsev kub vim hais tias nws Curie kub nyob deb ntawm ambient. Kev kos duab txias, hnyav machining lossis vuam tuaj yeem tsim cov lus teb sib nqus me ntsis hauv thaj tsam cuam tshuam.
Q: Dab tsi yog qhov tsis zoo ntawm Alloy 625 bar?
Nqi thiab machinability. Lub complex muaj pes tsawg leeg, siab nickel thiab molybdenum ntau ntau thiab niobium ntxiv ua rau lub bar considerably kim dua Alloy 600, thiab nws toughness txhais tau tias qeeb txiav speeds, ntau zaus cov cuab yeej hloov thiab tshwj xeeb tooling.
Q: Qib twg muaj zog dua ntawm qhov kub thiab txias?
Alloy 625. Nws muaj lub zog tensile yam tsawg kawg nkaus ntawm 830 MPa tiv thaiv 550 MPa rau Alloy 600 nyob rau hauv cov kev mob annealed, thiab nws khaws ntau lub zog ntawm qhov kub thiab txias.
Q: Alloy 600 thiab Alloy 625 puas tuaj yeem txuas rau ib leeg?
Yog lawm. Ob leeg yog npib tsib xee-chromium austenitic qib uas tsis muaj theem hloov pauv, yog li cov pob qij txha sib txawv yog tsim nrog kev sib tw lossis siab dua me ntsis -nickel alloy-chromium muab tub lim hlau thiab ib txwm nickel- alloy vuam tswj.
Q: Qhov bar twg yuav tsum raug xaiv rau siab -chloride kev pabcuam?
Alloy 625. Nws 8-10% molybdenum ntxiv muab pitting thiab crevice corrosion kuj uas Alloy 600 tsis tuaj yeem sib xws, thiab nws yog qib ib txwm xaiv rau marine thiab offshore chloride-cov haujlwm ua haujlwm.
Q: Qhov luaj li cas ntawm cov khoom muaj nyob rau hauv cov qib bar no?
Round bar ntawm 3 hli mus rau 800 hli nyob rau hauv kub dov, forged los yog peeled mob, txias drawn puag ncig bar los ntawm 3 hli mus rau 100 hli, hexagonal bar los ntawm 2 hli mus rau 100 hli thoob plaws flats thiab tiaj bar ntawm 2 hli mus rau 100 hli tuab thiab 10 hli mus rau 500 hli dav.
