Tsis txhob tsuas saib cov pa roj carbon xwb! Lub "Ntiaj Teb Tseeb" ntawm CEV
Ib qho yuam kev uas cov neeg tshiab ua hauv kev lag luam hlau feem ntau xav tias cov pa roj carbon tsawg (C) sib npaug rau kev vuam yooj yim. Xav dua.
Hauv lub ntiaj teb niaj hnub no uas muaj cov kav dej uas muaj zog heev (xws li X70 lossis X80), cov chaw tsim khoom ntxiv cov Manganese (Mn), Chromium (Cr), thiab Molybdenum (Mo) kom ua tiav cov hom phiaj muaj zog. Txawm hais tias cov no tsis yog "carbon," lawv ua haujlwm zoo li nws thaum lub sijhawm txias ntawm kev vuam. Lawv ua rau thaj chaw Heat Affected Zone (HAZ) tawg yooj yim - tawg yooj yim li iav yog tias koj tsis ceev faj.
CEV (Tus Nqi Sib Npaug ntawm Cov Pa roj carbon)yog koj lub pob siv lead ua. Nws hloov tag nrho cov hlau sib xyaw ua ke mus rau hauv ib feem pua "carbon-equivalent". Yog tias koj xam qhov no tsis raug, koj qhov vuam yuav zoo li zoo hnub no tab sis txhim khocov kab nrib pleb txiasnyob rau hauv kev nyuaj siab tag kis.
Xaiv Cov Qauv Zoo: IIW vs. Pcm
Ib qho loj me tsis haum rau txhua tus. Kev xaiv cov mis tsis raug yog qhov uas feem ntau cov engineers ua yuam kev.
A. Cov Qauv Qub: IIW Formula
Siv qhov no rau cov hlau carbon txheem lossis txhua yam hlau uas cov ntsiab lus carbon yogsiab tshaj 0.12%Nws yog tus qauv kub thoob ntiaj teb rau kev ua hlau ib txwm muaj.
B. Tus Ntug Niaj Hnub: Pcm Cov mis
Rau cov kav dej uas muaj zog heev, cov pa roj carbon tsawg (feem ntauTMCPua tiav nrog C < 0.08%), cov mis IIW yuav kwv yees qhov nyuaj rau cov hlau TMCP uas muaj cov pa roj carbon tsawg. Nws yuav ua rau koj ua kom cov yeeb nkab uas tsis xav tau nws sov ua ntej. Hloov chaw, siv Ito-Bessyo Pcmtus qauv:
Daim Ntawv Qhia Txog Kev Sib Txuas Lus: Cov lej txhais li cas?
Koj tau ua lej thiab tau txais qhov tshwm sim zoo li 0.44%. Tam sim no ua li cas? Siv lub rooj sib piv kev lag luam no los txiav txim siab koj qhov kev txav mus tom ntej:
| CEV xam (%) | Kev Ntsuas Weldability | Cov Kev Cai Ua Ntej |
| ≤0.35 | Zoo heev | Feem ntau "tsis ua yuam kev." Tsis tas yuav ua kom sov ua ntej. |
| 0.36 – 0.40 | Zoo | Pom zoo kom ua kom sov ua ntej rau cov kav dej tuab (> 20mm). |
| 0.41 – 0.45 | Ncaj ncees | Pom zoo kom ua kom sov ua ntej rau cov kav dej tuab (> 20mm). |
| > 0.45 | Txom nyem | Muaj kev pheej hmoo siab. Tsuas yog siv cov hluav taws xob PWHT nruj thiab cov hluav taws xob uas muaj hydrogen tsawg xwb. |
Kev Pabcuam Qaug Zog & HIC: Vim Li Cas Cov Kev Txwv Thiaj Li Nyuaj Dua
Thaum koj ua haujlwm nrogkev pabcuam qaub—tshwj xeeb tshaj yog cov kav dej uas nqa H₂S—kev sib tham txog CEV hloov pauv tag nrho. Nws tsis yog hais txog kev vuam xwb. Tam sim no koj tab tom tswj hwm qhov kev pheej hmoo ua tsis tiav tiag tiag, thiab qhov ntawd yog qhov uasHIC (Kev tawg ua rau hydrogen tawg)ua ib qho kev txhawj xeeb.
Thiab qhov no yog qhov uas CEV siab dhau los ua teeb meem.
Feem ntau CEV siab dua txhais tau tias muaj zog dua tom qab vuam. Cov chaw tawv dua ntawd ua haujlwm zoo li cov ntxiab. Hydrogen sib sau ua ke ntawd raws sijhawm, lub siab nce siab, thiab thaum kawg, koj tuaj yeem tawg sab hauv - lossis hauv cov xwm txheej phem dua, ua rau mob los ntawm sab hauv mus rau sab nraud.
Nws tsis yog ib yam dab tsi uas koj yuav pom tam sim ntawd, yog vim li cas nws thiaj txaus ntshai.
Qhov ntawd kuj yog qhov laj thawj uas cov neeg siv khoom ua haujlwm hauv NACE MR0175 feem ntau yog cov neeg ua haujlwm ruaj khov. Hauv cov haujlwm tiag tiag, nws yog ib qho uas pom qhov yuav tsum tau ua zoo li:
CEV ≤ 0.43
Txawm hais tias qib hlau nws tus kheej tuaj yeem tso cai rau cov nqi siab dua, lawv tseem thawb nws kom qis dua - tsuas yog kom nyob twj ywm sab.
Cov pa roj carbon sib npaug hauv cov yeeb nkab hlau
LubTus Nqi Sib Npaug ntawm Cov Pa roj carbon (CEV)nws txawv ntau ntawm ntau hom thiab qib txheem ntawm cov kav hlau. Qhov kev hloov pauv no cuam tshuam ncaj qha rau kev ua haujlwm ntawm cov khoom siv thiab qhia txog cov txheej txheem vuam tshwj xeeb uas xav tau ntawm qhov chaw kom ntseeg tau tias muaj kev ruaj khov ntawm cov qauv.
Yuav kom nkag siab zoo dua txog kev sib raug zoo ntawm cov tshuaj lom neeg sib xyaw thiab kev vuam tau zoo, nws yog ib qho tseem ceeb uas yuav tsum tshuaj xyuas seb cov khoom siv carbon thiab alloying sib cuam tshuam li cas hauv cov qauv kev lag luam. Txawm hais tias koj ua haujlwm nrog cov kab xa hluav taws xob siab lossis cov qauv dav dav, cov qauv tshuaj lom neeg no yog thawj kauj ruam mus rau kev nyab xeeb ntawm qhov project.
Cov Lus Qhia Txog CEV ntawm Cov Yeeb Nkab Hlau
Cov duab hauv qab no qhia txog cov qib feem ntau hauv kev lag luam, muab cov cim qhia tshuaj lom neeg siv los xam CEV:
| Hom Yeeb Nkab | Cov ntsiab lus carbon (C) | Cov ntsiab lus Manganese (Mn) | Cov ntsiab lus ntawm Chromium (Cr) | Cov ntsiab lus molybdenum (Mo) | Cov ntsiab lus ntawm Nickel (Ni) | Cov ntsiab lus tooj liab (Cu) | Cov pa roj carbon sib npaug (CE) |
| ASTM A53 GR B | 0.26% | 0.90% | 0.30% | 0.10% | 0.40% | 0.20% | 0.55 |
| ASTM A106 GR B | 0.28% | 0.90% | 0.30% | 0.10% | 0.40% | 0.20% | 0.57 |
| API 5L X42 | 0.21% | 1.30% | 0.20% | 0.10% | 0.30% | 0.20% | 0.53 |
| API 5L X52 | 0.22% | 1.20% | 0.20% | 0.10% | 0.30% | 0.20% | 0.5 |
Kev Kawm Txog Qhov Teeb Meem: Nyeem Daim Ntawv Pov Thawj Xeem API 5L X52 Mill (MTC)
Cia peb saib lub yeeb nkab X52 seamless tiag tiag. Koj lub MTC qhia tau tias:
C:0.14% |Mn:1.15% |Cr:0.04% |V:0.02% |Tsis yog:0.05% |Cu:0.10%
Siv cov qauv IIW:
Lub sijhawm tshaj tawm: Lub Peb Hlis-04-2026
