SA387 Qib 12 Chav Kawm 1yog chromium-molybdenum alloy steel phaj them los ntawm ASME SA-387 tus qauv, tsim tshwj xeeb rau welded siab hlab ntsha thiab boiler Cheebtsam uas ua haujlwm nyob rau hauv qhov kub thiab txias. Cov qib kev tsim qauv qhia txog nws cov ntsiab lus chromium thiab molybdenum, uas muab lub zog kub kub zoo, nkag siab tsis kam, thiab oxidation tsis kam. Chav Kawm 1 qhia tau hais tias cov khoom tau muab nkag rau hauv cov xwm txheej zoo, uas ua kom zoo dua cov qauv ntawm cov nplej thiab txhim kho ductility thiab toughness, ua rau cov hlau yooj yim rau kev tsim, vuam, thiab fabricate. Cov khoom siv no feem ntau yog siv rau hauv cov roj, roj, thiab petrochemical kev lag luam, nrog rau hauv kev siv hluav taws xob tsim hluav taws xob uas yuav tsum muaj kev ua tau zoo ntawm qhov kub siab.
Sib npaug
| BS | EN | ASTM / ASME | DIN |
| 620 B | 13 ZPO 45 | SA387-12-1 | 13 ZPO 44 |
Specifications rau ASME SA387 Qib 12 Alloy Steel Phaj
| Lub npe | Nominal Chromium Cov ntsiab lus (%) |
Nominal Molybdenum Cov ntsiab lus (%) |
| SA387 Qib 12 | 1.00% | 0.50% |
Tensile Requirements rau ASME SA387 Qib 12 Alloy Steel Phaj Chav Kawm 1 Phaj
| Lub npe: | Yuav tsum tau: | Qib 12 |
| SA387 Qib 12 | Tensile zog, ksi [MPA] | 65 txog 85 [450 rau 585] |
| Yield zog, min, ksi [MPa] / (0.2% offset) | 40 [275] | |
| Elongation hauv 8 nti. [200mm], min % | 19 | |
| Elongation hauv 2 nti [50mm], min, % | 22 | |
| Txo thaj tsam, min% | ––– |
Cov Khoom Siv Tshuaj Rau ASME SA387 Qib 12 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| ASME SA387 Qib 12 | ||
| Cov pa roj carbon: | Kev Ntsuas Kub: | 0.05 - 0.17 |
| Product Analysis: | 0.04 - 0.17 | |
| Manganese: | Kev Ntsuas Kub: | 0.40 - 0.65 |
| Product Analysis: | 0.35 - 0.73 | |
| Phosphorus: | Kev Ntsuas Kub: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulfur (max): | Kev Ntsuas Kub: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Kev Ntsuas Kub: | 0.15 - 0.40 |
| Product Analysis: | 0.13 - 0.45 | |
| Chromium: | Kev Ntsuas Kub: | 0.80 - 1.15 |
| Product Analysis: | 0.74 - 1.21 | |
| Molybdenum: | Kev Ntsuas Kub: | 0.45 - 0.60 |
| Product Analysis: | 0.40 - 0.65 |
kev khiav dej num
1. Kev yuav khoom thiab kev tshuaj xyuas thawj zaug
SA387 Qib 12 Qib 1 steel yog thawj zaug los ntawm cov neeg muag khoom tsim nyog, nrog rau kev txheeb xyuas cov ntawv pov thawj zeb kom paub meej tias ua raws li tus qauv. Kev tshuaj xyuas cov khoom lag luam suav nrog kev tshuaj xyuas tshuaj lom neeg thiab kev tshuaj ntsuam xyuas kom ntseeg tau tias cov khoom siv chromium-molybdenum cov ntsiab lus thiab cov khoom siv tshuab ua tau raws li cov kev xav tau ntawm lub nkoj.
2. Kev npaj txiav thiab ntug
Thaum pom zoo, daim hlau raug txiav kom loj siv cov ntshav, laser, lossis sawing. Tom qab ntawd cov npoo yog npaj nrog qhov yuav tsum tau zawj-xws li V-groove- thiab ntxuav kom huv si kom tshem tawm cov roj, xeb, thiab lwm yam kab mob uas tuaj yeem cuam tshuam qhov vuam zoo.
3. Kev tsim
Kev sib sau ua tiav yog txias lossis kub. Kev sib sau txias yog tsim rau nruab nrab khoov, thaum kub sib sau yog siv rau cov phaj tuab lossis cov duab nyuaj. Hot-formed qhov chaw yog feem ntau normalized tom qab ntawd los kho qhov xav tau microstructure thiab xyuas kom meej txhua yam khoom zoo ib yam.
4. Kev npaj ua ke thiab vuam
Cov khoom sib xyaw ua ke thiab clamped rau hauv txoj hauj lwm. Qhov chaw vuam tau raug ntxuav dua, thiab ua kom sov ua ntej siv - kauj ruam tseem ceeb rau Cr-Mo steels - txhawm rau tiv thaiv kev tawg. Tsawg-hydrogen welding consumables raug xaiv los txo qhov kev pheej hmoo tawg.
5. Vuam
Vuam ua haujlwm nrog ceev faj tswj cov cua sov thiab sib cuam tshuam kub kom tsis txhob overheating thiab tswj cov khoom lub zog thiab toughness. Multi-pass cov txheej txheem yog siv los xyuas kom meej fusion zoo thiab txo qis kev ntxhov siab.
6. Kev kho cua sov tom qab Weld (PWHT)
Tom qab vuam, PWHT yog ua los ntawm cua sov cov khoom rau qhov tsim nyog kub, tuav nws, thiab maj mam txias. Cov kauj ruam no txo cov kev ntxhov siab seem, ua rau lub microstructure, txhim kho toughness, thiab pab tiv thaiv kev ntxhov siab corrosion cracking.
7. Kev soj ntsuam zaum kawg thiab kev sim
Cov welds ua tiav thiab cov qauv raug tshuaj xyuas siv cov txheej txheem tsis muaj kev puas tsuaj xws li kev kuaj hluav taws xob thiab ultrasonic rau qhov tsis xws luag, thiab kev ntsuam xyuas kev sib nqus los yog sib nqus particle rau qhov tsis zoo. Kev ntsuam xyuas tshuab-xws li kev ntsuas tensile, cuam tshuam, thiab hardness kuaj- kuj tseem tuaj yeem ua, thiab lub nkoj siab dhau mus rau qhov ntsuas hydrostatic kom paub meej tias nws txoj kev ncaj ncees.
Kev tsim cov txheej txheem ntawm SA387 Qib 12 Qib 1 steel feem ntau suav nrog kev txiav, sib sau (txawm txias lossis kub), kev npaj vuam, vuam, thiab tom qab- vuam kev kho cua sov. Lub hom phiaj tseem ceeb yog los xyuas kom meej tias cov khoom siv tshuaj lom neeg muaj pes tsawg leeg-tshwj xeeb tshaj yog nws cov ntsiab lus chromium thiab molybdenum- thiab nws cov khoom siv tshuab ua tau raws li qhov yuav tsum tau ua rau kev siv lub nkoj siab. Kev saib xyuas tshwj xeeb yuav tsum tau them rau vuam, qhov uas nruj preheating, ceev faj tswj ntawm interpass kub, thiab kom zoo post-weld heat treatment (PWHT) yog qhov tseem ceeb los txo cov kev ntxhov siab vuam, tiv thaiv kev tawg, ua kom haum rau cov yam ntxwv ntawm Cr-Mo steels, thiab xyuas kom meej tag nrho kev nyab xeeb.
Cov ntawv thov tseem ceeb:
Cov nkoj siab:
Txhawm rau kom muaj kev nyab xeeb ntawm cov kua thiab cov pa hauv qhov kub thiab txias.
Muaj boilers:
Cheebtsam hauv thermal fais fab nroj tsuag raug tshav kub heev.
Kub Exchangers & Condenser:
Ua kom muaj txiaj ntsig zoo hloov pauv hauv kev lag luam petrochemical thiab hluav taws xob.
Roj & Roj Kev Lag Luam:
Siv rau hauv cov cuab yeej siv rau kev pabcuam qaub (muaj H2S) thiab cov ntug dej hiav txwv drilling vim nws cov corrosion kuj.
Cov Khoom Siv Tshuaj:
Fabrication ntawm reactors thiab cia tso tsheb hlau luam nyob rau hauv chemical processing nroj tsuag.
Kev tsim hluav taws xob:
Cheebtsam hauv ntau lub zog- cov khoom siv.
Thov kom muaj kev tshaj lij rau SA387 Qib 12 Chav Kawm 1 los ntawm GNEE Steel.
SA 387 GR 12 khoom yog dab tsi?
Engineered rau siv nyob rau hauv siab kub kev pab cuam, ASME SA387 Qib 12 yog ib tug chrome molybdenum carbon alloy hlau rau siv nyob rau hauv weldable siab hlab ntsha thiab muaj boilers.
Dab tsi yog cov ntsiab lus tseem ceeb ntawm SA 387 Qib 12 Chav Kawm 1?
Nws muaj chromium (Cr) thiab molybdenum (Mo) ua cov ntsiab lus alloying, uas txhim kho nws qhov siab - qhov kub thiab txias tsis kam.
Dab tsi yog cov tshuaj muaj pes tsawg leeg rau SA 387 Qib 12 Chav Kawm 1?
Feem ntau, nws suav nrog ib ncig ntawm 0.50-0.80% Cr, 0.45-0.60% Mo, nrog rau kev tswj hwm cov nyiaj carbon, manganese, silicon, phosphorus, thiab sulfur.
Qhov txawv ntawm SA 387 Qib 12 Chav Kawm 1 thiab Chav Kawm 2 yog dab tsi?
Chav Kawm 1 muaj kev txwv tshuaj lom neeg muaj pes tsawg leeg thiab nruj dua cov cuab yeej cuab yeej cuab tam piv rau Chav Kawm 2, ua kom muaj kev ntseeg siab dua hauv cov ntawv thov tseem ceeb.
Qhov kev pabcuam kub siab tshaj plaws rau SA 387 Qib 12 Chav Kawm 1 yog dab tsi?
Nws yog feem ntau siv rau hauv daim ntawv thov nrog kev pabcuam kub txog li 900℃F (482 degree), nyob ntawm qhov tshwj xeeb tsim thiab chaw thau khoom.
Dab tsi yog cov khoom siv kho tshuab ntawm SA 387 Qib 12 Chav Kawm 1?
Feem ntau, nws muaj qhov tsawg kawg nkaus lub zog ntawm 30 ksi (205 MPa) thiab lub zog tensile yam tsawg kawg nkaus ntawm 60-80 ksi (415-550 MPa), nrog rau qhov zoo ductility thiab cuam tshuam tsis kam.
Yuav tsum tau kho cua sov dab tsi rau SA 387 Qib 12 Chav Kawm 1?
Nws feem ntau yog muab nyob rau hauv qhov normalized thiab tempered mob kom ua tau raws li qhov yuav tsum tau muaj zog thiab toughness rau siab - kub kev pab cuam.
Vim li cas SA 387 Qib 12 Chav Kawm 1 haum rau cov hlab ntsha siab?
Nws kev sib xyaw ua ke ntawm siab - qhov kub thiab txias zog, nkag siab tsis kam, thiab weldability zoo ua rau nws zoo tagnrho rau cov hlab ntsha siab ua haujlwm nyob rau hauv qhov kub thiab txias.
Dab tsi yog cov ntawv thov ntawm SA 387 Qib 12 Chav Kawm 1?
Feem ntau siv xws li boiler Cheebtsam, lub siab lub nkoj plhaub, headers, thiab lwm yam structural qhov chaw nyob rau hauv refineries, petrochemical nroj tsuag, thiab lub hwj chim tsim.
Dab tsi yog temper embrittlement, thiab nws cuam tshuam li cas rau SA 387 Qib 12 Chav Kawm 1?
Temper embrittlement yog qhov txo qis hauv qhov tawv tom qab raug rau qee qhov kub, uas tuaj yeem tshwm sim hauv Cr-Mo steels. Kev kho cua sov kom zoo thiab kev tswj xyuas alloy txo qhov kev pheej hmoo no.