Hastelloy C4 yog ib tug npib tsib xee alloy muaj thermal stability thiab corrosion kuj nyob rau hauv ib puag ncig txhoj puab heev. Raws li ib qho ntawm feem ntau ruaj khov npib tsib xee alloys, nws tswj nws cov khoom txawm tias tom qab ntev raug rau qhov kub thiab txias, ua rau nws invaluable rau kev siv tshuaj.
Kab lus no qhia txog cov ntsiab lus dav dav ntawm Hastelloy C4 cov tshuaj muaj pes tsawg leeg, lub cev thiab cov khoom siv kho tshuab, kev tiv thaiv corrosion, thiab kev siv.
Hastelloy C4 Chemical Composition
Hastelloy C4 yog wrought npib tsib xee alloy los muab kev ua tau zoo nyob rau hauv ib puag ncig corrosive. Cov muaj pes tsawg leeg yog tus cwj pwm los ntawm nws cov ntsiab lus tsis tshua muaj carbon thiab silicon, uas ua rau txo qis kev pheej hmoo ntawm carbide nag lossis daus thiab tom qab intergranular corrosion hauv cov qauv welded.
Cov tshuaj nominal muaj pes tsawg leeg ntawm Hastelloy C4 yog teev nyob rau hauv cov lus hauv qab no:
|
Kev sib xyaw |
Cov ntsiab lus (%) |
|
Nickel (Ni) |
Qhov nyiaj tshuav (kwv yees li 65%) |
|
Chromium (Cr) |
14-18 |
|
Molybdenum (hli) |
14-17 |
|
Hlau (Fe) |
3 max |
|
Cobalt (zeeg) |
2 max |
|
Titanium (Ti) |
0.7 max |
|
Manganese (Mn) |
1 max |
|
Silicon (Si) |
0.08 max |
|
Cov pa roj carbon (C) |
0.015 max |
|
Phosphorus (P) |
0.04 max |
|
Sulfur (S) |
0.03 max |
Lub tswv yim omission ntawm tungsten distinguishes Hastelloy C4 los ntawm yav dhau los alloys zoo li C276, thaum lub sij hawm txo cov hlau cov ntsiab lus ua rau kom thermal stability los ntawm kev txo qis kev puas tsuaj ntawm intermetallic theem tsim thaum lub sij hawm ntev siab - kub raug.
Hastelloy C4 Lub cev muaj zog
Hastelloy C4 lub cev muaj zog yam ntxwv ntawm nickel{1}}chromium- molybdenum alloys:
Cov lus: Lub cev muaj zog ntawm Hastelloy C4
|
Khoom |
Tus nqi |
Tej yam kev mob/Notes |
|
Qhov ntom |
8.64 g / cm³ (0.312 lb / hauv³) |
Thaum 20 degree |
|
Melting Point |
1335-1380℃(2435-2516℃F) |
- |
|
Tshwj xeeb kub muaj peev xwm |
408 J/kg · degree |
Ntawm 100 degree |
|
Thermal conductivity |
10.1 W/m·K |
Ntawm 100 degree |
|
Coefficient ntawm Thermal Expansion |
10.9 × 10⁻⁶ / degree |
20-100℃(txhais coefficient) |
|
Hluav taws xob Resistivity |
1.25 μΩ · cm |
Thaum 20 degree |
|
Modulus ntawm Elasticity |
211 GPa (30.8 × 10³ ksi) |
Nyob rau hauv nruj, ntawm 20 degree |
|
Modulus ntawm Rigidity |
78.6 GPa (11.4 × 10³ ksi) |
Thaum 20 degree |
Cov thermal conductivity tsawg thiab nruab nrab thermal expansion coefficient ntawm Hastelloy C4. Lub siab hluav taws xob tiv thaiv ua rau nws cov yam ntxwv zoo vuam piv rau cov khoom siv hluav taws xob ntau dua.
Hastelloy C4 Mechanical Properties
Chav Kub Mechanical Properties
Nyob rau hauv cov mob annealed, Hastelloy C-4 feem ntau nthuav tawm:
Tensile zog: 690-860 MPa (100-125 ksi)
Yield Strength (0.2% offset): Ntau dua lossis sib npaug rau 275 MPa (Ntau dua lossis sib npaug rau 40 ksi)
Elongation: Ntau dua lossis sib npaug li 40% hauv 2 ntiv tes
Kev txo qis ntawm cheeb tsam: kwv yees li 50%
Hardness: Tsawg dua lossis sib npaug rau 217 HB (Brinell) lossis Tsawg dua lossis sib npaug rau 95 HRB (Rockwell B)
Cov hlau tuav tau zoo kawg nkaus ductility thiab toughness txawm nyob rau ntawm qhov kub thiab txias mus rau -196 degree, nrog Charpy V-notch feem ntau tshaj 120 J ntawm ob chav tsev kub thiab -196 degree.
Cov khoom kub siab
Hastelloy C4 muaj qhov tshwj xeeb thermal stability, khaws cov khoom siv kho kom zoo ntawm qhov kub txog li 1040 degree. Lub alloy tuav zoo ductility thiab corrosion kuj txawm tias tom qab ntev - lub sij hawm laus ntawm 650-1040℃.
Corrosion Resistance Properties
Kev tiv thaiv corrosion ntawm Hastelloy C4 sawv cev rau nws cov yam ntxwv tseem ceeb tshaj plaws, nrog rau kev ua tau zoo thoob plaws ntau qhov chaw corrosive:
Uniform Corrosion
Hastelloy C-4 nthuav tawm qhov ua tau zoo rau ntau qhov kev tawm tsam corrosive, suav nrog:
Hot contaminated mineral acids (sulfuric, hydrochloric, phosphoric acids)
Organic thiab inorganic chlorides, qhuav chlorine gas
Formic thiab acetic acids, acetic anhydride
Cov kuab tshuaj, dej hiav txwv, thiab brine daws
Cov alloy qhia tau hais tias kev ua tau zoo tshwj xeeb hauv qhov chaw oxidizing heev, qhov twg nws yuav ua tau zoo tshaj C-276. Txawm li cas los xij, hauv kev txo cov xov xwm zoo li hydrochloric acid, C-276 feem ntau qhia tau zoo dua.
Localized Corrosion
Cov ntsiab lus molybdenum siab (14-17%) muab kev tiv thaiv zoo heev rau pitting thiab crevice corrosion nyob rau hauv ib puag ncig uas muaj chloride. Qhov no ua rau Hastelloy C-4 haum rau cov ntawv thov hauv dej hiav txwv, dej brackish, thiab cov txheej txheem tshuaj chloride catalysts los yog cov kab mob.
Lub ultra- cov ntsiab lus carbon tsawg (tsawg dua lossis sib npaug li 0.015%) ua rau muaj txiaj ntsig zoo rau kev hnov mob thiab cuam tshuam tom qab intergranular corrosion. Cov cwj pwm tseem ceeb no txo qis kev tsim cov qoob loo ciam teb carbides hauv weld tshav kub- thaj chaw cuam tshuam, tso cai rau cov hlau siv los ua -welded mob rau feem ntau cov txheej txheem siv tshuaj tsis tas yuav tsum tau tshaj tawm -weld solution annealing.
Kev tshawb fawb pom tau hais tias kom zoo welded Hastelloy C4 pob qij txha tuaj yeem pom qhov sib piv lossis txawm tias zoo dua corrosion tsis kam rau lub hauv paus hlau, nrog corrosion tus nqi qis li 5.03 hli / xyoo hauv kev ntsuam xyuas intergranular corrosion.
Thermal Stability thiab Microstructural yam ntxwv
Hastelloy C4 tau tsim tshwj xeeb rau kev txhim kho thermal stability piv rau cov nickel alloys ua ntej. Lub tswv yim muaj pes tsawg leeg tswj txo qis kev tsim ntawm cov theem cuam tshuam intermetallic thiab carbides thaum lub sij hawm ntev raug rau qhov kub thiab txias.
Cov alloy nta lub ntsej muag -centered cubic (FCC) austenitic qauv uas nyob ruaj khov nyob rau hauv nws qhov kub thiab txias. Qhov kev ruaj ntseg microstructural no ua kom muaj kev ua tau zoo nyob rau hauv siab - daim ntawv thov kub xws li cov tshuab hluav taws xob desulfurization, cov khoom siv tshuaj ua haujlwm, thiab cov khoom siv hluav taws xob nuclear reprocessing qhov chaw uas muaj thermal cycling.
Fabrication thiab Processing yam ntxwv
Vuam
Hastelloy C4 muaj qhov zoo weldability siv cov txheej txheem fusion vuam, suav nrog:
Gas Tungsten Arc Welding (GTAW/TIG)
Gas Metal Arc Vuam (GMAW/MIG)
Plasma Arc Vuam
Shielded Hlau Arc Vuam (SMAW)
Cov kev coj ua uas pom zoo muaj xws li:
Siv cov khoom sib xyaw ua ke ntawm cov hlau (ERNiCrMo-7) lossis Hastelloy C-4 cov khoom siv vuam.
Kev tuav cov cua kub tsis tshua muaj hluav taws xob nrog kev sib tshuam kub hauv qab 150 degree.
Xyuas kom cov khoom nyob rau hauv annealed mob ua ntej - vuam.
Kev tu kom zoo kom tshem tawm cov kab mob.
Kev kho cua sov
Hastelloy C4 feem ntau yog muab rau hauv cov kev daws teeb meem -annealed mob kom txhim kho corrosion kuj. Lub alloy tsis tuaj yeem ntxiv dag zog los ntawm kev kho cua sov ib leeg, vim nws tsis dhau los nag lossis daus hardening.
Kub thiab txias ua haujlwm
Kub Ua Haujlwm: Pom zoo kub ntau ntawm 1080-900℃nrog ceev txias tom qab ua tiav.
Kev Ua Haujlwm Txias: Yuav tsum muaj lub zog ntau dua li austenitic stainless hlau vim muaj kev ua haujlwm siab dua; intermediate annealing tej zaum yuav tsim nyog rau loj deformations.
