SA 387 Qib 5 Chav Kawm 2yog chromium-molybdenum alloy steel phaj tau teev tseg raws li ASME cov qauv, feem ntau yog tsim los siv rau hauv cov hlab ntsha thiab cov boilers uas ua haujlwm ntawm qhov kub siab. Nws belongs rau tsev neeg ntawm qis- alloy steels qhov twg chromium muab kev txhim kho corrosion thiab molybdenum txhim kho creep zog thiab siab - qhov kub thiab txias stability, tso cai rau cov khoom tswj nws cov neeg kho tshuab kev ncaj ncees nyob rau lub sij hawm ntev kev pab cuam nyob rau hauv thermal stress. Chav Kawm 2 qhia txog kev ua kom zoo dua qub nrog kev tswj hwm nruj dua ntawm cov tshuaj muaj pes tsawg leeg thiab cov khoom siv kho tshuab, kom ntseeg tau tias muaj zog dua thiab kev ntseeg siab dua piv rau cov chav kawm qis. Cov qib no feem ntau siv rau hauv cov khoom siv refinery, petrochemical processing units, thiab cov tshuab tsim hluav taws xob uas tsis kam tiv thaiv hydrogen nres thiab lub zog ruaj khov ntawm qhov kub thiab txias yog qhov tseem ceeb.
Khoom Specification
| Specification Element | Kev xav tau | SHH hlau ua raws | Ntsiab lus |
| Thawj Standard | ASME SA-387/SA-387M | ASME Section VIII | SA387 Gr 5 Cl 2 specification |
| Thickness Ntau | 6mm-100mm (kev cai) | Mill Test Certificate | SA387 Gr 5 Cl 2 qhov ntev |
| Dav / Ntev | Mus txog 4600mm / 12000mm | Kev cai fabrication muaj | SA387 Gr 5 Cl 2 loj xaiv |
| Kev kuaj Ultrasonic | No laminations >0.25% thickness | Chav Kawm 1 rau ASME SA-578 | SA387 Gr 5 Cl 2 kev tshuaj xyuas |
| Kev kho cua sov | Quenched thiab tempered | 870-900℃quench, 620-650℃temper | SA387 Gr 5 Cl 2 Thaum tshav kub kub kho |
Tshuaj muaj pes tsawg leeg
| Element | Kev Ntsuam Xyuas Kev Nyuaj Siab (%) | Kev txheeb xyuas cov khoom (%) | Txheem txwv | Txoj Kev Xeem | Lub luag haujlwm | Ntsiab lus |
| Cov pa roj carbon (C) | 0.05-0.15 | 0.04-0.16 | 0.15 max | ASME SA-350 | Lub zog tsis muaj brittleness | SA387 Gr 5 Cl 2 carbon |
| Manganese (Mn) | 0.30-0.60 | 0.27-0.66 | 0.30-0.60 | ASME SA-350 | Toughness, hardenability | SA387 Gr 5 Cl 2 manganese |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.025 | Tsawg dua lossis sib npaug li 0.025 | 0.025 max | ASME SA-350 | Txo brittleness | SA387 Gr 5 Cl 2 phosphorus |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.025 | Tsawg dua lossis sib npaug li 0.025 | 0.025 max | ASME SA-350 | Txhim kho weldability | SA387 Gr 5 Cl 2 sulfur |
| Silicon (Si) | 0.50-0.80 | 0.44-0.86 | 0.50-0.80 | ASME SA-350 | Deoxidation, fluidity | SA387 Gr 5 Cl 2 silicon |
| Chromium (Cr) | 4.00-6.00 | 3.90-6.10 | 4.00-6.00 | ASME SA-350 | Corrosion kuj | SA387 Gr 5 Cl 2 chromium |
| Molybdenum (hli) | 0.45-0.65 | 0.40-0.70 | 0.45-0.65 | ASME SA-350 | Creep kuj | SA387 Gr 5 Cl 2 molybdenum |
Kev kho cua sov
| Qhov xwm txheej | Tus nqi/qhov xwm txheej | Txuj | Pom zoo | Ntsiab lus |
| Kev kho cua sov | Quench 870-900 degree, Kub 620-650 degree | ASME SA387 | Q&T txheem | SA387 Gr 5 Cl 2 Thaum tshav kub kub kho |
ua
1. Steelmaking thiab Casting
Melting: Ua los ntawm Electric Arc Rauv (EAF) lossis Basic Oxygen Rauv (BOF).
Refining: Tau Txais Ladle Refining (LRF) thiab Nqus Degassing (VD) kom tshem tawm impurities (sulfur, phosphorus) thiab gases (hydrogen), kom ntseeg tau tias "huv steel" chemistry.
Casting: Cam khwb cia rau hauv slabs ntawm nruam casting los yog ingot casting.
2. Kub Rolling
Cov slabs yog reheated thiab dov ntawm qhov kub thiab txias mus rau qhov yuav tsum tau phaj thickness.
Chav Kawm 2 Cov Kev Xav Tau: Kev tswj cov dov tsis tau siv los xyuas kom cov khoom tuaj yeem ua tiav lub zog tensile siab dua (75-100 ksi) xav tau rau Chav Kawm 2 piv rau Chav Kawm 1.
3. Kev kho cua sov (theem tseem ceeb)
Yuav kom ua tiav cov cuab yeej cuab tam ntawm Chav Kawm 2, cov phiaj yuav tsum tau txais kev kho cua sov tshwj xeeb:
Normalizing: Cua sov lub phaj rau kwv yees li 900℃-960℃thiab cua txias hauv huab cua kom kho cov qauv nplej.
Tempering: Reheating rau sub- kub tseem ceeb (tsawg kawg 675 degree) los txhim kho toughness thiab ductility thaum tuav lub zog siab.
quenching (Yeem): Yog tias tau teev tseg rau cov phaj tuab, ua kom txias txias (kua quenching) ua raws li tempering yog siv kom ua tiav cov khoom sib xws.
4. Fabrication Processing
Txiav: Feem ntau ua tiav siv nplaim taws (Oxy- roj) Txiav lossis Plasma Txiav. Vim yog 5% Chromium cov ntsiab lus, preheating lub phaj ua ntej txiav yog feem ntau pom zoo kom tiv thaiv ntug cracking.
Kev tsim: tuaj yeem ua txias lossis kub tsim. Kub sib sau yog nyiam rau hnyav thicknesses; yog tias kub tsim, cov khoom siv yuav xav tau rov- kho cua sov los kho cov khoom.
Vuam: Yuav tsum muaj kev tswj xyuas thermal nruj.
Preheat: Feem ntau ntawm 150℃thiab 250 degree.
Tshaj tawm -Weld Heat Treatment (PWHT): Yuav tsum tau ua kom muaj kev ntxhov siab- txo qhov vuam thiab tiv thaiv hydrogen- ua kom tawg.
5. Kev kuaj thiab tshuaj xyuas
Mechanical Testing: Tensile tests, Yield zog, thiab Elongation checks kom paub tseeb tias nws ua tau raws li cov qauv 2.
Kev Ntsuam Xyuas Kev cuam tshuam: Charpy V-Kev ntsuas ntsuas ntsuas (yog tias tau teev tseg) kom ntseeg tau tias qis- qhov kub thiab txias.
NDT (Tsis yog-Kev Ntsuas Kev Ua Phem): Kev Ntsuas Ultrasonic (UT) rau SA 578 txhawm rau txheeb xyuas qhov tsis zoo lossis laminations.
6. Kev kho deg
Kev Txhaum Txhaum Cai: Tshem tawm cov nplai zeb.
Priming/Coating: Siv xeb- tiv thaiv cov roj los yog zinc primers rau khaws cia thiab thauj.
Primary Industrial Applications
Roj thiab Gas Refining:Siv dav rau cov khoom siv roj refinery, nrog rau kev tshawb nrhiav roj av thiab kev thauj mus los.
Petrochemical thiab Chemical Processing:Qhov tseem ceeb rau cov khoom uas raug kev tawm tsam hnyav thiab siab - qhov kub thiab txias, xws li cov khoom siv tshuaj lom neeg.
Kev tsim hluav taws xob:Ua hauj lwm hauv siab - kub boilers, chav generators, thiab nuclear fais fab nroj tsuag Cheebtsam.
Cov cuab yeej siv tshwj xeeb
Cov nkoj siab:Tshwj xeeb tsim rau weldable siab hlab ntsha ua haujlwm ntawm qhov kub siab.
Boilers thiab Kub Exchangers:Siv nyob rau hauv kev tsim kho ntawm industrial boilers, tshav kub exchangers, thiab boiler nruas.
Pipework thiab Heavy Machinery:Siv rau hauv cov khoom hnyav- cov kav dej, cov li qub, thiab cov tshuab ua haujlwm uas raug kev kub ntxhov.
Cia thiab Logistics:Siv rau siab -kub vuam steel cia tso tsheb hlau luam thiab cov kev pabcuam qaub.
Secondary thiab Niche Industries
Pulp thiab ntawv:Siv nyob rau hauv machinery rau ntawv thiab pulp ua.
Marine thiab Seashore:Siv nyob rau hauv dej hiav txwv thiab marine ib puag ncig vim nws siab tiv thaiv corrosion.
Aerospace thiab Defense:Ua hauj lwm nyob rau hauv aerospace Cheebtsam xav tau thermal stability.
Khoom noj khoom haus thiab Pharmaceutical:Siv rau hauv kev ua zaub mov thiab kev lag luam kws tshuaj.
Tau txais cov lus muaj nuj nqis rau SA 387 Qib 5 Chav Kawm 2, Hu rau GNEE Steel.
SA 387 Qib 5 Chav Kawm 2 yog dab tsi?
SA 387 Qib 5 Chav Kawm 2 yog chromium-molybdenum alloy steel phaj teev nyob rau hauv ASME Boiler thiab Pressure Vessel Code. Nws yog feem ntau yog siv rau welded siab hlab ntsha thiab boiler Cheebtsam ua hauj lwm nyob rau hauv siab kub. Cov khoom siv no muaj lub zog zoo, nkag siab tsis kam, thiab oxidation tsis kam, ua rau nws haum rau refineries, petrochemical nroj tsuag, thiab kev siv hluav taws xob tsim. Nws cov tshuaj muaj pes tsawg leeg thiab cov khoom siv kho tshuab tau nruj nruj kom ntseeg tau tias muaj kev ntseeg siab nyob rau hauv siab - kub thiab siab - siab.
Cov qauv dab tsi suav nrog SA 387 Qib 5 Chav Kawm 2?
SA 387 Qib 5 Chav Kawm 2 yog them los ntawm ASME SA-387, uas yog ib feem ntawm ASME Boiler thiab Pressure Vessel Code, Tshooj II, Ntu A. Cov qauv no txhais cov cai rau chromium-molybdenum steel daim hlau siv hauv cov hlab ntsha siab. Nws qhia txog cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, kev kho cua sov, thiab cov txheej txheem kuaj. Kev ua raws li SA-387 xyuas kom meej tias cov khoom ua tau raws li qhov tsim nyog kev nyab xeeb thiab kev ua haujlwm zoo rau cov kev pabcuam kub kub hauv cov ntawv thov tseem ceeb.
Dab tsi yog cov tshuaj muaj pes tsawg leeg ntawm SA 387 Qib 5 Chav Kawm 2?
SA 387 Qib 5 Chav Kawm 2 feem ntau muaj chromium thiab molybdenum ua cov ntsiab lus tseem ceeb, nrog rau carbon, manganese, silicon, sulfur, thiab phosphorus. Chromium muab oxidation thiab corrosion kuj, thaum molybdenum txhim khu kev siab - kub lub zog thiab creep kuj. Cov pa roj carbon monoxide yog tswj los tswj cov weldability thiab toughness. Cov ntsiab lus tsuas yog txwv los tiv thaiv embrittlement thiab xyuas kom meej cov khoom sib xws ntawm cov khoom sib txawv.
Dab tsi yog cov khoom tseem ceeb ntawm SA 387 Qib 5 Chav Kawm 2?
SA 387 Qib 5 Chav Kawm 2 feem ntau tau teev cov txiaj ntsig tsawg kawg nkaus thiab lub zog tensile, nrog rau qhov zoo elongation thiab txo qhov chaw. Nws kuj muaj qhov tsim nyog cuam tshuam rau lub zog, tshwj xeeb tshaj yog tom qab kev kho cua sov kom raug. Cov khoom no ua rau nws tsim nyog rau cov hlab ntsha siab thiab boiler Cheebtsam uas raug rau qhov kub thiab txias thiab nruab nrab mus rau qhov siab. Cov ntaub ntawv tuav nws lub zog thiab ductility nyob rau hauv ntev -lub sij hawm thermal raug, kom ntseeg tau kev ua tau zoo.
Yuav tsum tau kho cua sov dab tsi rau SA 387 Qib 5 Chav Kawm 2?
SA 387 Qib 5 Chav Kawm 2 feem ntau xav kom normalizing thiab tempering. Normalization suav nrog cua sov rau qhov ntsuas kub thiab cua txias kom ua kom lub microstructure zoo dua. Tempering ua raws li, rov ua kom sov kom qis dua kom txo cov tawv tawv thiab txhim kho toughness. Qhov kev kho cua sov ob zaug no ua kom cov khoom ua tiav qhov kev xav tau ntawm kev sib xyaw ua ke ntawm lub zog, ductility, thiab tsis kam mus rau temper embrittlement, uas yog ib qho tseem ceeb rau kev kub siab - kev pab cuam.
Qhov kev pabcuam kub siab tshaj plaws rau SA 387 Qib 5 Chav Kawm 2 yog dab tsi?
SA 387 Qib 5 Chav Kawm 2 feem ntau yog siv rau hauv kev pabcuam kub txog li ntawm 900℃F (480 degree), txawm hais tias qhov kev txwv tseeb nyob ntawm tus qauv tsim, theem kev ntxhov siab, thiab lub sijhawm raug. Nws cov chromium- cov ntsiab lus molybdenum muab kev tiv thaiv oxidation zoo thiab nkag siab lub zog ntawm qhov kub siab. Kev kho cua sov kom raug thiab cov txheej txheem vuam yog qhov tseem ceeb los tswj nws cov khoom siv kho tshuab thiab tiv thaiv kev ua tsis tiav ntxov nyob rau hauv lub sijhawm ntev - qhov kub thiab txias.
Hauv daim ntawv thov twg yog SA 387 Qib 5 Chav Kawm 2 nquag siv?
SA 387 Qib 5 Chav Kawm 2 yog siv dav hauv cov hlab ntsha siab, boilers, thiab cov khoom siv hluav taws xob hauv cov refineries, cov nroj tsuag petrochemical, thiab cov chaw tsim hluav taws xob. Nws yog qhov tsim nyog rau cov khoom siv xws li cov hlab ntsha reactor, ncu nruas, headers, thiab cov kav dej ua haujlwm ntawm qhov kub thiab txias. Cov khoom muaj peev xwm tiv thaiv tau nkag thiab oxidation ua rau nws zoo tagnrho rau kev tuav cov hydrocarbons, chav dej, thiab lwm yam kev tawm tsam hnyav hauv qhov xav tau ib puag ncig.
SA 387 Qib 5 Chav Kawm 2 txawv li cas ntawm Qib 5 Chav Kawm 1?
SA 387 Qib 5 Chav Kawm 1 thiab Chav Kawm 2 muaj cov tshuaj lom neeg zoo sib xws tab sis txawv ntawm cov cuab yeej cuab tam. Chav Kawm 2 muaj ntau dua cov lus qhia tsawg kawg nkaus thiab lub zog tensile piv rau Chav Kawm 1. Chav Kawm 2 kuj tau txais kev kho cua sov ntau dua thiab kev sim kom ua tiav lub zog zoo dua thiab tawv. Raws li qhov tshwm sim, Chav Kawm 2 yog qhov nyiam rau cov ntawv thov ntau dua qhov xav tau lub zog siab dua ntawm qhov kub siab.
Dab tsi yog qhov kev txiav txim siab vuam rau SA 387 Qib 5 Chav Kawm 2?
Vuam SA 387 Qib 5 Chav Kawm 2 yuav tsum tau ua tib zoo preheating thiab post-weld heat treatment kom tsis txhob tawg thiab ua kom tawv. Preheat kub nyob ntawm phaj thickness thiab carbon sib npaug. Tsawg- cov txheej txheem hydrogen welding thiab cov khoom siv tau raug pom zoo kom txo qis hydrogen-induced cracking. Tom qab-weld heat treatment relieves residual stresses and improves the microstructure of the heat-ffect area, ensure long{11}}term performance in high-temperature service.