Cov tuam txhab lag luam tuaj yeem hloov kho cov raj zoo meej
Qhov tseem ceeb ntawm qhov kub thiab txias tempering brittleness ntawm precision ci raj feem ntau suav hais tias yog qhov tshwm sim ntawm kev sib cais ntawm impurity ntsiab xws li phosphorus, tin, antimony thiab arsenic nyob rau hauv thawj austenite grain ciam teb, ua rau grain ciam teb embrittlement. Cov ntsiab lus alloy xws li manganese, npib tsib xee thiab chromium yog sib cais nrog cov impurity saum toj no ntawm cov ciam teb, uas txhawb nqa cov khoom ntawm impurity thiab intensifies embrittlement. Ntawm qhov tsis sib xws, molybdenum muaj kev sib cuam tshuam nrog phosphorus thiab lwm yam impurity, uas tuaj yeem tsim cov nag lossis daus hauv cov siv lead ua thiab cuam tshuam cov qoob loo ciam teb ntawm phosphorus, uas tuaj yeem txo qhov brittleness ntawm kub tempering. Cov ntsiab lus tsis tshua muaj hauv ntiaj teb kuj muaj cov txiaj ntsig zoo ib yam li molybdenum. Titanium tuaj yeem txhawb nqa nag lossis daus ntawm phosphorus thiab lwm yam impurity nyob rau hauv cov siv lead ua, yog li ua kom tsis muaj zog ntawm cov qoob loo ciam teb ntawm impurity ntsiab thiab ua rau lub siab kub ntawm lub brittleness.
Cov kev ntsuas los txo qhov kub siab tempering brittleness ntawm precision ci raj yog raws li nram no: (1) tom qab kub kub tempering, roj txias los yog dej ceev ceev txias yog siv los inhibit qhov segregation ntawm impurity ntsiab ntawm lub grain ciam (2) Thaum lub molybdenum cov ntsiab lus nyob rau hauv cov hlau nce mus rau 0.7%, embrittlement nyiam ntawm high-temperature tempering yog heev txo. Tshaj li qhov kev txwv no, 20 # precision steel hlab tsim tshwj xeeb carbides nplua nuj nyob rau hauv molybdenum, cov ntsiab lus molybdenum hauv matrix txo, thiab embrittlement nyiam ntawm precision ci raj nce (3) Txo 20 # cov ntsiab lus ntawm impurity ntsiab hauv precision steel yeeb nkab (4 ) Nws yog ib qho nyuaj rau tiv thaiv embrittlement ntawm qhov chaw ua hauj lwm nyob rau hauv high-temperature tempering embrittlement cheeb tsam rau lub sij hawm ntev los ntawm kev ntxiv molybdenum ib leeg. Tsuas yog los ntawm kev txo 20 # impurity cov ntsiab lus nyob rau hauv precision steel yeeb nkab, kev txhim kho purity ntawm precision ci yeeb nkab, ntxiv los ntawm kev sib xyaw alloying ntawm txhuas thiab cov ntsiab lus tsis tshua muaj hauv ntiaj teb, tuaj yeem tiv thaiv kev kub ntxhov siab.
Tam sim no, muaj ntau tshaj 5100 cov chaw tsim khoom nyob rau hauv ntau tshaj 1850 tuam txhab uas muag nyob rau hauv ntau tshaj 110 lub teb chaws, nrog rau ntau tshaj 260 nroj tsuag nyob rau hauv ntau tshaj 170 tuam txhab uas muag nyob rau hauv 44 lub teb chaws. Hauv xyoo 2000, qhov pom tseeb ntawm kev siv cov yeeb nkab seamless hauv Suav teb yog 4.18 lab tons, suav nrog 3.821 lab tons ntawm cov khoom siv hauv tsev, suav txog 91.4% ntawm tag nrho cov kev thov hauv tsev. Kev xa tawm yog 359000 tons, suav txog 8.59% ntawm tag nrho cov kev thov hauv tsev. Nyob rau tib lub xyoo, kev siv cov kav dej yog kwv yees li 910000 tons. Cov ntshuam yog li 252000 tons. Cov kav dej xa tawm suav txog li 70% ntawm tag nrho cov khoom siv hauv tsev, ntawm cov kav dej xa mus rau 27.69% ntawm tag nrho cov khoom siv hauv tsev, thiab cov kav dej muaj li 70% ntawm tag nrho cov kav dej tsis sib haum. Cov kav roj uas tau los ntawm Nyiv tus account rau ntau tshaj li ib nrab ntawm tag nrho cov ntshuam. Tianjin steel yeeb nkab tuam txhab, Tuam Tshoj tus loj tshaj plaws roj casing ntau lawm puag, tsim 522000 tons ntawm steel yeeb nkab khoom nyob rau hauv 2000, nrog rau 364100 tons ntawm roj casing. Casing tso nyiaj rau ntau tshaj ib nrab ntawm lub teb chaws cov roj ntau lawm. Nws yog thawj zaug hauv Tuam Tshoj txoj kev lag luam casing nyob rau hauv cov nqe lus ntawm cov zis thiab muag ntim.
Los ntawm kev lag luam thoob ntiaj teb thiab hauv tsev, lub peev xwm tsim khoom ntawm cov kav dej seamless (xws li cov kav dej tshwj xeeb) tau dhau qhov kev thov. Yog li ntawd, nyob rau hauv lub neej yav tom ntej, lub hom phiaj yuav tsum yog nyob rau hauv muab tag nrho cov kev ua si rau lub peev xwm ntawm cov uas twb muaj lawm units thiab tsim cov khoom xws li roj kav, high-pressure boiler kav thiab roj cylinder kav nrog high zog qib, siab puas thiab corrosion kuj. Nws kuj yog cov ntsiab lus ntawm optimizing cov qauv khoom rau Tuam Tshoj lub lag luam steel. Qhov no kuj yog tus yuam sij kom muaj kev sib tw ntawm cov khoom hauv tsev thiab txawv teb chaws thiab nthuav dav kev lag luam. Qhov ntawd yog hais tias, kev txhim kho kev lag luam kev sib tw ntawm kev lag luam steel yeeb nkab yog lub luag haujlwm ntev thiab tus yuam sij rau kev vam meej ntawm kev lag luam hauv tsev tom qab Tuam Tshoj nkag mus rau WTO.
