Xov xwm - Kub-dov hlau coils: Lub Mainstay ntawm Kev Lag Luam Field

Nyob rau hauv niaj hnub kev lag luam system, kub-kuav los tiag steel coils yog cov ntaub ntawv yooj yim, thiab lawv cov kev sib txawv ntawm cov qauv thiab kev ua tau zoo sib txawv ncaj qha cuam tshuam rau txoj kev loj hlob ntawm downstream industries. Cov qauv sib txawv ntawm cov kub dov steel coils ua lub luag haujlwm tsis tuaj yeem hloov pauv hauv kev tsim kho, tsheb, lub zog, thiab lwm yam nrog lawv cov tshuaj lom neeg tshwj xeeb thiab cov khoom siv kho tshuab. Cov hauv qab no yuav tsom mus rau kev txheeb xyuas cov qauv kub-dov steel coil nrog cov kev xav tau ntawm kev lag luam siab tshaj plaws thiab lawv qhov sib txawv tseem ceeb.

Basic Main Force: Q235B thiab SS400
Q235B yog cov khoom siv qis tshaj plaws hauv Suav teb, nrog cov ntsiab lus carbon ntawm li 0.12% -0.20%, thiab muaj cov yas zoo thiab cov khoom siv vuam. Nws lub zog tawm los yog ≥235MPa thiab tau siv dav hauv cov khoom siv hauv tsev, kev txhawb nqa choj thiab cov khoom siv dav dav. Nyob rau hauv kev tsim kho kev lag luam, I-beams, channel steels thiab lwm yam steels ua los ntawm Q235B kub dov steel coils account rau ntau tshaj 60%, txhawb lub cev pob txha ntawm nroog infrastructure.
SS400 yog ib qho kev siv thoob ntiaj teb carbon structural steel nrog lub zog zoo sib xws rau Q235B, tab sis nruj tswj hwm ntawm leej faj thiab phosphorus impurities thiab zoo dua nto zoo. Hauv kev tsim cov nkoj, SS400 kub dov coils feem ntau yog siv rau cov khoom siv hauv lub cev. Nws cov seawater corrosion kuj zoo dua li cov pa roj carbon zoo tib yam, ua kom muaj kev nyab xeeb ntawm dej hiav txwv voyages.

Cov neeg sawv cev muaj zog: Q345B thiab Q960
Q345B yog cov hlau tsis tshua muaj zog siab nrog 1.0% -1.6% manganese ntxiv, thiab lub zog tawm los yog siab dua 345MPa. Piv nrog rau Q235B, nws lub zog yog nce li ntawm 50%, thaum tuav zoo weldability. Hauv kev tsim choj choj, lub thawv girders ua los ntawm Q345B kub dov steel coils tuaj yeem txo qhov hnyav los ntawm 20%, txo cov nqi engineering. Xyoo 2023, kev tsim kho choj hauv tsev yuav siv ntau tshaj 12 lab tons ntawm Q345B kub dov coils, suav txog 45% ntawm tag nrho cov zis ntawm hom no.
Raws li ib tug neeg sawv cev ntawm ultra-siab zog steel, Q960 ua tau ib tug yield zog ntawm ≥960MPa los ntawm microalloying technology (ntxiv vanadium, titanium thiab lwm yam khoom) thiab tswj dov thiab tswj cov txheej txheem txias. Nyob rau hauv lub tshav pob ntawm engineering machinery, lub thickness ntawm lub crane caj npab ua los ntawm Q960 kub-kuav los tiag kauj yuav raug txo kom tsawg tshaj li 6 hli, thiab lub load-bearing muaj peev xwm yog nce los ntawm 3 lub sij hawm, uas txhawb nqa lub lightweight upgrade ntawm cov khoom xws li excavators thiab cranes.

Tshwj xeeb Benchmark: SPHC thiab SAPH340
SPHC yog cov khoom lag luam siab kawg ntawm cov kub dov qis-carbon steels. Los ntawm optimizing cov txheej txheem dov los tswj cov qoob loo, qhov elongation nce mus txog ntau dua 30%. Hauv kev lag luam khoom siv hauv tsev, SPHC kub dov coils yog siv los tsim cov tub yees compressor vaj tse. Nws qhov kev sib sib zog nqus kos duab ua kom ntseeg tau tias qhov tsim nyog tus nqi ntawm txoj kev nkhaus ntawm qhov chaw sib sau ntau tshaj 98%. Nyob rau hauv 2024, kev noj ntawm SPHC kub-dov coils nyob rau hauv cov khoom siv hauv tsev yuav nce 15% xyoo-rau-xyoo mus rau 3.2 lab tons.
Raws li kev tsim kho tsheb hlau, SAPH340 ua tiav qhov sib npaug ntawm lub zog thiab lub zog los ntawm kev ntxiv 0.15% -0.25% carbon thiab kab boron. Nyob rau hauv kev tsim lub zog tshiab lub tsheb roj teeb thav duab, SAPH340 kub dov coils tuaj yeem tiv taus qhov hnyav ntawm ntau dua 500MPa thiab ua tau raws li qhov yuav tsum tau ua ntawm cov txheej txheem vuam. Nyob rau hauv 2023, qhov feem ntawm kub dov coils ntawm hom no siv nyob rau hauv domestic tshiab zog tsheb tau mus txog 70% ntawm cov roj teeb yam ntxwv qhov chaw.

Qauv	Yield zog (MPa)	Elongation (%)	Hom Daim Ntawv Thov Scenarios
q235 ib	≥235	≥ 26	Kev tsim vaj tsev, kev siv tshuab dav dav
q345 ib	≥345	≥ 21	Cov choj, cov hlab ntsha siab
SPHC	≥275	≥30	Cov khoom siv hauv tsev, qhov chaw pib
q960 ua	≥960	≥12	Engineering machinery, khoom siv high-end