ASTM A204 Qib C yog dab tsi?
Qhov tsawg kawg nkaus yield zog ntawmASTM A204 Qib Csteel phaj yog295 MPa ua(43 hli). Qhov no alloy molybdenum siab hlab ntsha hlau feem ntau nta lub zog tensile xws li 515-655 MPa (75-95 ksi). Nws yog dav siv rau welded boilers thiab siab hlab ntsha vim nws lub zog siab thiab kub tsis kam.
ASTM A204 Qib C yog qhov siab tshaj plaws -lub zog molybdenum- alloy steel phaj specification nyob rau hauv tus qauv ASTM A204, tshwj xeeb yog tsim rau welded boilers thiab lwm cov hlab ntsha siab. Nws muaj ib tug nominal0.50% molybdenumcov ntsiab lus, uas muab kev nkag siab zoo dua - lub peev xwm los tiv thaiv deformation nyob rau hauv qhov kev ntxhov siab tas li ntawm qhov kub thiab txias. Nrog lub zog tensile ntau ntawm75-95 ksi (515-655 MPa), Qib C raug xaiv rau siab - cov ntawv thov siab qhov twg thermal stability yog qhov tseem ceeb. Nws ua raws li cov khoom siv hluav taws xob tseem ceeb rau cov khoom siv uas ua haujlwm nyob rau nruab nrab - mus rau - qhov kub thiab txias (txog 500 degree), qhov twg cov qauv carbon steels yuav poob lawv cov qauv kev ncaj ncees.
Cov yam ntxwv tseem ceeb
Peak Creep zog:Qhov sib ntxiv ntawm molybdenum zoo tiv thaiv cov yas qeeb deformation hu ua "creep" thaum lub sij hawm ntev - raug rau kub kub thiab siab.
High Yield-rau-Tensile Ratio:Muab qhov tsawg kawg nkaus yield zog ntawm45 ksg, muab qhov pib muaj zog tiv thaiv kev deformation mus tas li nyob rau hauv siab - qauv kev ntxhov siab.
Kev txhim kho Hardenability:Molybdenum tsub kom qhov tob ntawm hardening, kom ntseeg tau tias txawm tias cov phaj tuab heev tswj cov khoom sib xws ntawm qhov chaw mus rau qhov tseem ceeb.
Fully Killed Steel Production:Feem ntau yog tsim los siv cov kev coj ua kom tua tag nrho kom paub meej cov qauv zoo thiab ua kom huv hauv siab.
Resistance rau Softening:Khaws nws cov tawv tawv thiab lub zog zoo dua li cov pa roj carbon monoxide -manganese steels thaum raug kub ntawm 480℃.
Qib Qib
ASTM:American Society for Testing and Materials.
A:Prefix rau Ferrous (hlau{0}}raws li) cov ntaub ntawv.
204:Txheem rau Molybdenum Alloy Steel siab nkoj daim hlau.
Qib C:Lub zog siab tshaj plaws (75-95 ksi) nyob rau hauv cov lus qhia no.
Kev sib piv (vs. ASTM A204 Qib B)
Yuav tsum muaj zog:Qib C (75–95 ksi tensile) yog qhov muaj zog dua li Qib B (70–90 ksi tensile), tso cai rau kev tsim ntau dua.
Yield Gap:Qib C xav tau qhov tsawg kawg nkaus tawm los ntawm45 ksg, thaum Qib B xav tau40 ksg, ib tug 12.5% nce nyob rau hauv cov qauv muaj peev xwm.
Fabrication Sensitivity:Vim muaj cov pa roj carbon ntau dua thiab muaj zog, Qib C yuav tsum muaj kev tswj xyuas nruj dua ntawm vuam preheat thiab interpass kub dua qib B.
Phab ntsa Thickness Optimization:Qhov siab dua qhov kev cia siab ntawm Qib C ua rau cov kws tsim kho kom txo tau cov phab ntsa tuab ntawm cov hlab ntsha, uas tuaj yeem txo cov nqi tag nrho cov nqi txawm tias cov khoom siv ntau dua.
Daim Ntawv Thov Kev Sib Tham
Siab -Steam Drums:Cov chaw khaws cia tseem ceeb hauv cov nroj tsuag hluav taws xob uas sau thiab faib cov siab -kub saturated chav.
Refinery Catalytic Crackers:Loj - cov nkoj loj siv los rhuav tshem cov roj crude hnyav ntawm qhov kub siab.
Hnyav-Wall Heat Exchangers:Cov khoom siv uas muaj kev kub siab sab hauv thiab cov thermal hloov pauv tseem ceeb tshwm sim ib txhij.
Steam Header Manifolds:Distribution hubs rau siab -cov kab hluav taws xob siab hauv cov cua kub loj lossis lub zog hluav taws xob.
Ammonia Synthesis Converters:High - siab ncaj siab chambers siv rau cov tshuaj tiv thaiv uas muaj xws li kub kub thiab siab.
ASTM A204 Qib C puas tuaj yeem siv rau hauv kev siv roj thiab roj av?
Yog lawm, ASTM A204 Qib C yog siv nyob rau hauv offshore roj thiab roj daim ntawv thov, tshwj xeeb tshaj yog rau kev tsim kho cov hlab ntsha, tshav kub exchangers, thiab pipelines. Cov hlau muaj peev xwm tiv taus ob qho tib si kev kub siab thiab kub kub ua rau nws haum rau offshore drilling rigs thiab ntau lawm platforms, uas hnyav ib puag ncig tej yam kev mob.
Cov tshuaj muaj pes tsawg leeg ntawm ASTM A204 Qib C yog dab tsi?
ASTM A204 Qib C feem ntau muaj carbon (0.15-0.25%), manganese (0.60-0.90%), silicon (0.15-0.40%), phosphorus (0.035% max), sulfur (0.035% max), thiab molybdenum (0.25%).-0. Qhov tshwj xeeb muaj pes tsawg leeg no muab cov hlau siab zog, zoo weldability, thiab zoo heev tiv taus cua sov, ua rau nws zoo tagnrho rau cov kev siv xws li cov hlab ntsha siab thiab boilers uas ua haujlwm ntawm qhov kub thiab txias.
ASTM A204 Qib C feem ntau muab tau li cas?
ASTM A204 Qib C feem ntau yog muab rau hauv daim ntawv ntawm daim hlau, uas tuaj yeem ua tiav thiab tsim los siv rau hauv cov hlab ntsha siab, boilers, thiab lwm yam khoom siv kub siab. Nws kuj tseem tuaj yeem muab tau rau hauv cov khoom siv dov lossis cov tuav, nyob ntawm qhov xav tau tshwj xeeb ntawm daim ntawv thov, thiab feem ntau yog cua sov- kho kom tau raws li cov khoom tsim nyog.
Kev xav tau tshuaj
* Cov ntsiab lus sawv cev hauv feem pua
| Cov ntsiab lus % | SIB 204 Qib C |
|
|---|---|---|
| Cov pa roj carbon, max: | ||
| mus txog 1 nti [25 mm] incl. hauv thickness | 0.23 | |
| Tshaj 1 in. to 2 in [50 mm] incl. hauv thickness | 0.26 | |
| Tshaj 2 in. to 4 in. [100 mm] incl. hauv thickness | 0.28 | |
| Tshaj 4 nti. [100 mm] incl. hauv thickness | 0.28 | |
| Manganese, max: | ||
| Kev ntsuas kub: | 0.90 | |
| Cov khoom lag luam tsom xam: | 0.98 | |
| Phosphorus, max | 0.025 | |
| Sulfur, max | 0.025 | |
| Silicon: | ||
| Kev ntsuas kub | 0.15-0.40 | |
| Kev tshuaj xyuas cov khoom | 0.13-0.45 | |
| Molybdenum: | ||
| Kev ntsuas kub | 0.45-0.60 | |
| Kev tshuaj xyuas cov khoom | 0.41-0.64 | |
Tensile Requirements
| SIB 204 Qib C |
||
|---|---|---|
| ksi ua | [MPa] | |
| Tensile zog | 75-95 | [515-655] |
| Yield zog, min. | 43 | [295] |
| Elongation hauv 8 nti [200 mm], min, % | 16 | |
| Elongation hauv 2 nti [50 mm], min, % | 20 | |
1. Koj puas tuaj yeem piav qhia txog ASTM A204 Qib C hlau?
ASTM A204 Qib C yog qhov qis- alloy steel tsim rau siab - kub thiab siab - kev siv siab, xws li cov hlab ntsha thiab cov boilers. Nws muaj molybdenum (0.25-0.60%), uas ua rau nws muaj peev xwm tiv taus cua sov thiab oxidation. Qhov no ua rau nws zoo tagnrho rau kev lag luam xws li lub zog tsim hluav taws xob, petrochemical, thiab kev ua tshuaj lom neeg uas muaj zog, ua haujlwm ntev, thiab tsis kam mus rau qhov kub thiab txias yog qhov tseem ceeb.
2. ASTM A204 Qib C ua haujlwm li cas hauv cov xwm txheej siab -?
ASTM A204 Qib C lub zog tawm los tsawg kawg yog 205 MPa (30 ksi) ua kom nws tuaj yeem tiv taus kev ntxhov siab yam tsis muaj deformation mus tas li, ua rau nws haum rau siab - kev siv siab. Cov hlau no ua tau zoo hauv kev lag luam xws li kev tsim hluav taws xob thiab kev ua lag luam petrochemical, qhov twg cov hlab ntsha thiab cov khoom siv feem ntau raug rau cov neeg kho tshuab kev ntxhov siab thiab kub siab.
3. Dab tsi kev lag luam tau txais txiaj ntsig los ntawm kev siv ASTM A204 Qib C?
Kev lag luam uas tso siab rau cov cuab yeej muaj peev xwm tiv taus qhov kub thiab txias tau txais txiaj ntsig los ntawm ASTM A204 Qib C. Qhov no suav nrog kev tsim hluav taws xob, kev ua tshuaj lom neeg thiab petrochemical, thiab kev lag luam roj thiab roj. Cov hlau yog siv nyob rau hauv kev tsim cov hlab ntsha siab, boilers, thiab kub exchangers, tag nrho cov yuav tsum muaj kev ntseeg siab nyob rau hauv ib puag ncig hnyav.
4. Lub zog tensile ntawm ASTM A204 Qib C piv rau lwm cov ntaub ntawv li cas?
Lub zog tensile ntawm ASTM A204 Qib C yog li ntawm 485 txog 620 MPa (70-90 ksi), muab kev tiv thaiv zoo heev rau deformation hauv kev ntxhov siab. Qhov ntau yam no yog qhov tseem ceeb rau kev siv hauv cov hlab ntsha siab thiab cov boilers, qhov twg cov ntaub ntawv yuav tsum tiv taus ob qho tib si zoo li qub thiab dynamic pressures. Piv rau cov qauv carbon steels, qib no muaj kev ua tau zoo dua ntawm qhov kub siab.
5. Vim li cas molybdenum yog ib qho tseem ceeb ntawm ASTM A204 Qib C?
Molybdenum (0.25-0.60%) ho txhim kho ASTM A204 Qib C qhov tsis kam mus rau qhov kub thiab txias thiab oxidation. Cov khoom siv alloying no pab cov hlau tuav nws lub zog thiab cov qauv kev ntseeg siab ntawm qhov kub siab, ua rau nws zoo tagnrho rau ib puag ncig xws li tshuaj lom neeg refineries thiab fais fab nroj tsuag, qhov twg cov khoom raug cuam tshuam los ntawm kev kub siab thiab kub kub.
6. Post-weld kev kho cua sov (PWHT) ua li cas txhim kho ASTM A204 Qib C cov khoom?
PWHT yog qhov tseem ceeb rau kev txo qis kev ntxhov siab thiab txo qhov kev pheej hmoo ntawm kev tawg hauv welds. Rau ASTM A204 Qib C, PWHT ua kom ntseeg tau tias cov pob qij txha welded khaws cov khoom siv tshuab, xws li toughness thiab lub zog. Qhov kev kho no yog qhov tseem ceeb tshwj xeeb tshaj yog thaum vuam cov ntu tuab los tiv thaiv thermal qaug zog thiab ua kom muaj kev ncaj ncees ntawm cov txheej txheem siab - qhov kub thiab txias.
7. ASTM A204 Qib C tswj nws cov khoom ntawm qhov kub thiab txias li cas?
Cov hlau cov ntsiab lus molybdenum ua lub luag haujlwm tseem ceeb hauv kev tswj lub zog thiab ua haujlwm rau siab -kub oxidation. ASTM A204 Qib C khaws nws cov khoom siv kho tshuab, xws li lub zog tensile thiab lub zog tawm los, txawm tias qhov kub siab. Qhov no ua rau nws tswj hwm cov qauv kev ncaj ncees thiab kev ntseeg siab hauv cov ntawv thov xws li boilers, heat exchangers, thiab lwm yam siab -kub tshuab.
Tiv tauj peb ntawm info@gneesteels.com rau tus nqi, kev txhawb nqa, lossis kev daws teeb meem. Peb yeej ib txwm npaj los txhawb koj qhov project.
