keraklan isipan da reng tau naing balbulaning stainless steel at e ya kalawang. nung makanyan, malyari yang maging problema ing bakal. Iti metung yang metung a panig a maling pamisip tungkul keng kakulangan king pamanintindi keng stainless steel, na malyari ya namang kalawang keng mapilan a kundisyun.
Ing stainless steel atin yang abilidad a labanan ing atmospheric oxidation—buri ng sabyan, e ya maka-rust, ampo atin ya namang abilidad na mag-corrode keng media a maki acid, alkali, ampo asin—yapin ing, lalaban keng kaagnasan. Makanyan man, ing sukad ning kayang anti-corrosion abilidad mibayu ya keng chemical composition ning kayang bakal, ing estado ning proteksyun, ing kundisyun ning pamangamit ampo ing uri ning environmental media.
Ing stainless steel keraklan makadake ya kareng:
Keraklan, agpang keng metallographic structure, ing ordinaryung stainless steel makadake ya kareng atlung kategorya: austenitic stainless steel, ferritic stainless steel, ampo martensitic stainless steel. Base kareng atlung basic metallographic structures, para kareng partikular a pamangailangan ampo sangkan, dual-phase steels, precipitation-hardening stainless steels ampo high-alloy steels a maki bakal a mas mababa keng 50% ing mekwa.
1. Austenitic stainless steel.
Ing matrix dominadu ne ning austenite structure (CY phase) ning face-centered cubic crystal structure, ali magnetic, at pepatibe ne ning cold working (at malyaring magdalang mapilan a magnetic properties) stainless steel. Ing American Iron and Steel Institute makatalaga ya kapamilatan da reng bilang kareng 200 ampong 300 a serye, antimo ing 304 .
2. Ferritic stainless steel.
Ing matrix yapin dominadu ne ning ferrite structure ((metung a phase) ning body-centered cubic crystal structure, a magnetic at keraklan e malyaring pasikanan kapamilatan ning heat treatment, dapot malyari yang pasikanan bagya kapamilatan ning cold working. Ing American Iron and Steel Institute makamarka yang 430 ampong 446.
3. Martensitic stainless steel.
Ing matrix metung yang martensitic structure (body-centered cubic o cubic), magnetic, ampo ing kayang mekanikal a katangian malyari yang i-adjust kapamilatan ning heat treatment. Ing American Iron and Steel Institute mipakilala ya kareng bilang a 410, 420 ampo 440. Ing martensite atin yang austenite structure keng matas a temperatura, ampo nung palamigan ya keng room temperature keng ustung rate, ing austenite structure malyari yang maging martensite (ie, maging matibe).
4. Austenitic-ferritic (duplex) stainless steel.
Ing matrix atin yang austenite ampo ferrite two-phase structure, ampo ing laman ning less-phase matrix keraklan maygit yang 15%. Magnetic ya at malyari yang pasikanan kapamilatan ning cold working. 329 metung yang tipikal a duplex stainless steel. Nung ikumpara me keng austenitic stainless steel, ing dual-phase steel atin yang matas a sikanan, ampo ing resistensya na keng intergranular corrosion ampo ing chloride stress corrosion ampo ing pitting corrosion mas masanting ya.
5. Precipitation hardening stainless steel.
Ing matrix metung yang austenite o martensitic a istruktura at malyari yang pasikanan kapamilatan ning precipitation hardening. Ing American Iron and Steel Institute makamarka ya keng 600 series number, antimo ing 630, na 17-4PH.
Keraklan, dagdag pa kareng alloys, ing corrosion resistance ning austenitic stainless steel medyu masanting ya. keng e masyadung makasira a kapaligiran, ing ferritic stainless steel malyari yang gamitan. keng mildly corrosive a kapaligiran, nung ing materyal kailangan yang matas para keng sikanan o matas a katigasan, ing martensitic stainless steel ampo ing precipitation hardening stainless steel malyari yang gamitan.
karaniwan a stainless steel a uri ampo katangian
01 304 Stainless Steel
Metung ya kareng peka maralas dang gagamitan ampo peka maralas dang gagamitan a austenitic stainless steels. Iti masanting ya para keng pamaglalang kareng malalam a bage ampo acid pipelines, lulanan, bage keng istruktura, miyayaliwang katawan ning instrumentu, atbp. Malyari ya namang gamitan para keng pamaglalang kareng e magnetic, low-temperature a kasangkapan ampo bage.
02 304L Stainless Steel
Para asolve ing problema ning ultra-low carbon austenitic stainless steel a megawa pauli ning pamag-uran ning Cr23C6 a magdalang grabing intergranular corrosion tendency ning 304 stainless steel lalam da reng mapilan a kundisyun, ing kayang sensitized state intergranular corrosion resistance mas masanting ya kesa keng 304 stainless steel. Maliban keng mas mababa nang sikanan, deng aliwang katangian parehu la keng 321 stainless steel. Keraklan magagamit ya para kareng kasangkapan a e masira keng corrosion ampo kareng sangkap na e malyaring i-subject keng solution treatment kaybat ning welding, ampo malyari yang gamitan para gawa kareng miyayaliwang instrumentu.
03 304H Stainless Steel
Ing kilub a sanga ning 304 stainless steel atin yang carbon mass fraction a 0.04%-0.10%, at ing kayang matas a temperatura mas masanting ya kesa keng 304 stainless steel.
04 316 Stainless Steel
Ing pamagdagdag molybdenum keng base ning 10Cr18Ni12 steel gagawan na ing bakal na atin yang masanting a resistensya keng pamagbawas keng medium ampo pitting corrosion. keng danum dagat ampo kareng aliwang media, ing corrosion resistance mas masanting ya kesa keng 304 stainless steel, keraklan gagamitan da para kareng pitting-resistant a materyales.
05 316L Stainless Steel
Ing ultra-low carbon steel atin yang masanting a resistensya keng sensitized intergranular corrosion at masanting ya para keng pamaglalang kareng welded a bage ampo gamit a maki makapal a sukad ning section, antimo reng materyales a e maka-corrosion keng petrochemical equipment.
06 316H Stainless Steel
Ing kilub a sanga ning 316 stainless steel atin yang carbon mass fraction a 0.04%-0.10%, at ing kayang matas a temperatura mas masanting ya kesa keng 316 stainless steel.
07 317 Stainless Steel
Ing pitting corrosion resistance ampo ing creep resistance mas masanting la kesa keng 316L stainless steel, na gagamitan da keng pamaglalang petrochemical ampo organic acid corrosion resistant equipment.
08 321 Stainless Steel
Titanium-stabilized austenitic stainless steel, dagdag titanium para mas masanting ing intergranular corrosion resistance, ampo atin yang masanting a high-temperature mechanical properties, malyari yang palitan keng ultra-low carbon austenitic stainless steel. Maliban kareng espesyal a okasyun antimo ing matas a temperatura o hydrogen corrosion resistance, keraklan e ya rekomendadu gamitan.
09 347 Stainless Steel
Niobium-stabilized austenitic stainless steel, daragdagan ne ing niobium para mas masanting ing intergranular corrosion resistance, ing corrosion resistance keng acid, alkali, asin ampo aliwa pang corrosive media parehu ya keng 321 stainless steel, masanting ing welding performance, malyari yang gamitan bilang corrosion-resistant material ampo anti-corrosion Ing mainit a steel keraklan gagamitan de keng power fields at pechemical fields antimo ing pamangawang lulanan, pipa, heat exchanger, baras, furnace tubes kareng industrial furnaces, ampo furnace tube thermometers.
10 904L Stainless Steel
Ing super complete austenitic stainless steel metung yang uri ning super austenitic stainless steel a gewa ning OUTOKUMPU keng Finland. , Atin yang masanting a resistensya keng corrosion kareng non-oxidizing acids antimo ing sulfuric acid, acetic acid, formic acid ampo phosphoric acid, ampo atin yang masanting a resistensya keng crevice corrosion ampo stress corrosion resistance. Mayap ya para kareng miyayaliwang konsentrasyun ning sulfuric acid lalam ning 70°C, at atin yang masanting a corrosion resistance keng acetic acid ampo mixed acid ning formic acid ampo acetic acid keng nanu mang konsentrasyun ampo temperatura lalam ning normal a pressure.
11 440C stainless steel
Ing martensitic stainless steel atin yang pekamatas a katigasan kareng hardenable stainless steels ampo stainless steels, a maki katigasan a HRC57. keraklan gagamitan da para gawang nozzle, bearings,Mariposabalbula cores,Mariposabalbula luklukan, manggas,balbula tangke, atbp.
12 17-4PH stainless steel
Ing martensitic precipitation hardening stainless steel a maki hardness a HRC44 atin yang matas a sikanan, hardness ampo corrosion resistance ampo e malyaring gamitan keng temperatura a maygit 300°C. Atin yang masanting a corrosion resistance keng atmospera ampo diluted acid o asin. Ing kayang resistensya keng kaagnasan parehu ya keng 304 stainless steel ampo 430 stainless steel. Magagamit ya para gawang offshore platforms, turbine blades,Mariposabalbula (valve cores, valve seats, sleeves, valve stems) wait.
In balbula disenyu ampo pamili, miyayaliwang sistema, serye, ampo gradu ning stainless steel ing maralas akit. Potang mamili, ing problema dapat yang ikonsidera ibat kareng miyayaliwang panaun antimo ing partikular a medium ning prosesu, temperatura, pressure, stressed parts, corrosion, ampo ing gastus.
Oras ning pamagpost: Jul-20-2022
