Tsawg-carbon steel hlau rau kev siv dav dav yog cov khoom tsim tau zoo tshaj plaws ntawm cov hlau hlau, thiab nws txoj kab uas hla ntawm 0.16 thiab 10 hli. Raws li lub xeev saum npoo, nws tuaj yeem muab faib ua ob hom: du thiab galvanized, thiab raws li lub xeev xa khoom, nws tuaj yeem muab faib ua ob hom: txias duab thiab annealing.
Lub zog tensile ntawm txias-draw steel hlau yog feem ntau 26le; 635-1000MPa; ntsia thawv tsim yog feem pua 26le; 540-1320MPa. Qhov loj ntawm cov hlau txoj kab uas hla, qhov me dua lub tensile lub zog. Txawm li cas los xij, lub zog tensile ntawm txias-draw steel hlau rau kev tsim kho yuav tsum tsis txhob qis dua 635MPa. Lub zog tensile ntawm annealed steel hlau yog nruab nrab ntawm 295 thiab 500 MPa.
Thaum xaiv cov khoom siv raw, xav txog qhov hloov pauv ntawm cov hlau xaim, txhawm rau tiv thaiv lub zog tensile los ntawm kev siab dhau, cov ntsiab lus carbon ntawm cov hlau me me yuav tsum tsawg; tab sis rau qhov loj specification hlau rau cov ntsia hlau ua, cov khoom siv raw nrog cov ntsiab lus carbon ntau dua yuav tsum tau siv. , kom tsis txhob khoov cov hlau thaum lub punch. Feem ntau, thaum tsim cov hlau tsis zoo rau cov ntsia hlau tsis yog ntsia hlau, cov hlua hlau tuaj yeem raug kos los ntawm kev siv tshuab descaling (saib cov neeg kho tshuab descaling ntawm hlau pas nrig) thiab tsis muaj txheej txheej (saib cov cab kuj lubricating ).
Hauv kev tsim cov ntsia hlau ua los yog galvanized steel hlau, vim tias qhov kev xav tau siab ntawm nws qhov chaw zoo, feem ntau tom qab kev siv tshuab descaling, cov hlau qws yuav tsum tau me ntsis pickled thiab tom qab ntawd kho nrog yellowing thiab txiv qaub-stained txheej ua ntej kos duab. rub. Vim yog cov yas zoo thiab tsis muaj deformation tsis kam ntawm cov hlau tsis muaj carbon steel, tag nrho cheeb tsam txo tus nqi (saib cheeb tsam txo tus nqi) hauv ib qho kev kos duab tuaj yeem tau txais loj dua, thiab qhov siab tshaj plaws tuaj yeem ncav cuag li 95 feem pua.
Qhov kev txo qis ntawm txhua qhov hla yog feem ntau feem pua 26le; 35 feem pua. General-purpose low-carbon steel hlau yog siv rau kev kho cua sov ua ntej galvanizing lossis kev kho cua sov nruab nrab ntawm cov kauj ruam kos duab. Recrystallization annealing feem ntau yog siv, thiab txuas ntxiv rau qhov cub annealing thiab qhov cub rauv annealing yog dav siv. Nruam rauv annealing thiab nruam kub-dip galvanizing los yog electro-galvanizing ua haujlwm tas li; pit furnace annealing yog siv nyob rau hauv cov kab ntau lawm tsis tu ncua.
