Round Steels (Round Bar Hlau)

Kev faib tawm los ntawm txheej txheem
Round steel yog cais raws li kub dov, forged thiab txias kos.Kub dov puag ncig steel yog 5.5-250 mm loj.Ntawm lawv: 5.5-25 hli me me puag ncig steel feem ntau mus ncaj strips rau hauv bundles ntawm mov, feem ntau yog siv rau reinforcing tuav, bolts thiab ntau yam khoom;Round steel loj dua 25 hli, feem ntau yog siv hauv kev tsim cov tshuab, seamless steel yeeb nkab billet, thiab lwm yam.
Classified los ntawm cov tshuaj muaj pes tsawg leeg
Cov pa roj carbon steel tuaj yeem muab faib ua cov pa roj carbon tsawg, nruab nrab carbon steel thiab siab carbon steel raws li nws cov tshuaj muaj pes tsawg leeg (xws li cov ntsiab lus carbon).
(1) steel hlau
Kuj tseem hu ua cov hlau me me, cov ntsiab lus carbon ntawm 0.10% mus rau 0.30% Cov pa roj carbon tsawg yog ib qho yooj yim los txais ntau yam kev ua xws li forging, vuam thiab txiav, feem ntau siv hauv kev tsim cov chains, rivets, bolts, shafts, thiab lwm yam.
(2) Nruab nrab carbon steel
Cov ntsiab lus carbon 0.25% ~ 0.60% carbon steel.Muaj sedative steel, semi-sedative steel, boiling steel thiab lwm yam khoom.Dhau li ntawm cov pa roj carbon, nws kuj muaj ib qho me me ntawm manganese (0.70% ~ 1.20%).Raws li qhov zoo ntawm cov khoom tau muab faib ua cov pa roj carbon zoo tib yam thiab cov khoom siv zoo carbon steel.Zoo thermal ua hauj lwm thiab txiav kev ua tau zoo, tsis zoo vuam kev ua tau zoo.Lub zog thiab hardness yog siab dua cov pa roj carbon tsawg, tab sis cov yas thiab toughness yog qis dua cov pa roj carbon tsawg.Cov ntaub ntawv kub dov thiab cov khoom siv txias txias tuaj yeem siv ncaj qha yam tsis muaj kev kho cua sov lossis tom qab kev kho cua sov.Cov pa roj carbon nruab nrab tom qab quenching thiab tempering muaj cov khoom zoo txhua yam.Qhov siab tshaj plaws hardness tiav yog hais txog HRC55 (HB538), σb yog 600 ~ 1100MPa.Yog li nyob rau hauv nruab nrab lub zog theem ntawm ntau yam kev siv, nruab nrab carbon steel yog qhov dav siv tshaj plaws, ntxiv rau cov khoom siv hauv tsev, tab sis kuj muaj coob tus siv hauv kev tsim khoom ntawm ntau yam khoom siv.
(3) High carbon steel
Feem ntau hu ua cov cuab yeej hlau, cov ntsiab lus ntawm cov pa roj carbon ntau yog 0.60% txog 1.70% thiab tuaj yeem ua kom tawv thiab tempered.Hammers thiab crowbars yog ua los ntawm cov hlau nrog cov ntsiab lus carbon ntawm 0.75%.Cov cuab yeej txiav xws li laum, kais, reamer, thiab lwm yam yog tsim los ntawm cov hlau nrog cov ntsiab lus carbon ntawm 0.90% txog 1.00%.

Classification los ntawm cov hlau zoo
Raws li qhov zoo ntawm cov hlau tuaj yeem muab faib ua cov pa roj carbon zoo tib yam thiab cov pa roj carbon zoo.
(1) Ordinary carbon structural steel, tseem hu ua cov pa roj carbon zoo tib yam, muaj kev txwv dav ntawm cov ntsiab lus carbon, kev ua haujlwm ntau thiab cov ntsiab lus ntawm phosphorus, sulfur thiab lwm yam khoom seem.Hauv Suav teb thiab qee lub tebchaws, nws tau muab faib ua peb pawg raws li cov xwm txheej ntawm kev xa khoom xa tuaj: Class A steel yog hlau nrog cov khoom siv kho tshuab.Class B steels (Class B steels) yog cov hlau uas muaj cov tshuaj muaj pes tsawg leeg.Cov hlau tshwj xeeb (Class C steels) yog cov hlau uas lav ob qho tib si cov khoom thiab cov tshuaj lom neeg muaj pes tsawg leeg, thiab feem ntau siv los tsim cov khoom tseem ceeb.Tuam Tshoj tsim thiab siv feem ntau A3 steel (Class A No.3 steel) nrog cov ntsiab lus carbon ntawm li 0.20%, uas yog tsuas yog siv rau hauv engineering lug.
Qee cov pa roj carbon steel kuj ntxiv cov kab txhuas lossis niobium (lossis lwm cov carbide tsim cov ntsiab lus) los tsim cov nitride lossis carbide hais, txhawm rau txwv kev loj hlob ntawm cov nplej, ntxiv dag zog rau cov hlau, txuag hlau.Hauv Suav teb thiab qee lub tebchaws, txhawm rau ua kom tau raws li cov kev cai tshwj xeeb ntawm cov kws tshaj lij hlau, cov tshuaj lom neeg muaj pes tsawg leeg thiab cov khoom ntawm cov pa roj carbon zoo tib yam tau hloov kho, yog li tsim cov qauv carbon zoo tib yam rau kev siv (xws li choj, kev tsim kho, rebar, siab hlab ntsha steel, thiab lwm yam).
(2) Muab piv nrog cov pa roj carbon zoo tib yam, cov ntsiab lus ntawm leej faj, phosphorus thiab lwm yam tsis yog xim hlau suav nrog hauv cov khoom siv zoo carbon steel yog qis dua.Raws li cov ntsiab lus ntawm cov pa roj carbon monoxide thiab kev siv sib txawv, hom hlau no tau muab faib ua peb pawg:
① Tsawg dua 0.25% C yog cov pa roj carbon tsawg, tshwj xeeb tshaj yog cov pa roj carbon tsawg dua 0.10% ntawm 08F,08Al, vim nws qhov zoo sib sib zog nqus nqus thiab weldability thiab yog dav siv los ua qhov tob tob xws li tsheb, cov kaus poom .... . thiab lwm yam 20G yog cov khoom tseem ceeb rau boilers zoo tib yam.Tsis tas li ntawd, cov hlau me me kuj tau siv dav hauv cov hlau carburizing, siv hauv kev tsim khoom.
②0.25 ~ 0.60% C yog nruab nrab carbon steel, feem ntau yog siv nyob rau hauv cov kev mob ntawm tempering, ua qhov chaw nyob rau hauv lub machinery manufacturing kev lag luam.
(3) Siab dua 0.6% C yog cov pa roj carbon siab, feem ntau yog siv rau hauv kev tsim cov springs, zog, yob, thiab lwm yam.
Raws li cov ntsiab lus manganese sib txawv, nws tuaj yeem muab faib ua cov ntsiab lus manganese zoo tib yam (0.25 ~ 0.8%) thiab siab manganese cov ntsiab lus (0.7 ~ 1.0% thiab 0.9 ~ 1.2%) steel pawg.Manganese tuaj yeem txhim kho lub hardenability ntawm steel, ntxiv dag zog rau ferrite, txhim kho lub zog tawm los, tensile zog thiab hnav tsis kam ntawm hlau.Feem ntau, "Mn" yog ntxiv tom qab qib ntawm cov hlau nrog cov ntsiab lus siab manganese, xws li 15Mn thiab 20Mn, kom paub qhov txawv ntawm cov hlau nrog cov ntsiab lus manganese.