Round steel
Round steel yog hais txog ib qho khoom siv ntawm cov hlau nrog ib ncig hla ntu.Nws specifications qhia nyob rau hauv txoj kab uas hla, nyob rau hauv millimeters (mm), xws li "50mm" txhais tau tias ib puag ncig steel nrog ib txoj kab uas hla ntawm 50 hli.
Round steel muab faib ua peb hom: kub dov, forged thiab txias kos.Cov specifications ntawm kub dov round steel yog 5.5-250 mm.Ntawm lawv: 5.5-25 hli me me puag ncig steel feem ntau yog muab rau hauv cov khoom ntawm cov kab ncaj nraim, uas feem ntau siv los ua steel tuav, bolts thiab ntau yam khoom siv;puag ncig steel loj dua 25 hli yog siv los tsim cov khoom siv kho tshuab thiab cov raj tsis muaj seamless steel kav tos.
Round bar kev faib tawm
1.Classification los ntawm cov tshuaj muaj pes tsawg leeg
Cov pa roj carbon steel tuaj yeem muab faib ua cov pa roj carbon tsawg, cov pa roj carbon nruab nrab thiab cov pa roj carbon siab siab raws li cov tshuaj muaj pes tsawg leeg (uas yog, cov ntsiab lus carbon).
(1) steel hlau
Kuj hu ua me me hlau, cov ntsiab lus carbon yog los ntawm 0.10% mus rau 0.30%.Cov pa roj carbon tsawg yog ib qho yooj yim los txais ntau yam kev ua haujlwm xws li forging, vuam thiab txiav, thiab feem ntau yog siv los ua chains, rivets, bolts, shafts, thiab lwm yam.
(2) Nruab nrab carbon steel
Carbon steel nrog cov ntsiab lus carbon ntawm 0.25% mus rau 0.60%.Muaj steel tua, semi-tua steel, boiling steel thiab lwm yam khoom.Ntxiv nrog rau cov pa roj carbon monoxide, nws tseem tuaj yeem muaj me me ntawm manganese (0.70% txog 1.20%).Raws li cov khoom lag luam zoo, nws tau muab faib ua cov pa roj carbon zoo tib yam thiab cov khoom siv zoo carbon steel.Zoo thermal ua thiab txiav kev ua tau zoo, kev vuam tsis 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 txias-daws 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 tuaj yeem ua tiav yog hais txog HRC55 (HB538), thiab σb yog 600-1100MPa.Yog li ntawd, nyob rau hauv ntau yam kev siv ntawm nruab nrab lub zog theem, nruab nrab carbon steel yog feem ntau lug siv.Ntxiv nrog rau kev siv los ua cov khoom siv hauv tsev, nws kuj tau siv dav hauv kev tsim khoom ntawm ntau yam khoom siv tshuab.
(3) High carbon steel
Feem ntau hu ua cov cuab yeej hlau, cov ntsiab lus carbon yog los ntawm 0.60% mus rau 1.70%, thiab nws tuaj yeem ua kom tawv thiab tempered.Hammers, crowbars, thiab lwm yam yog ua los ntawm cov hlau nrog cov ntsiab lus carbon ntawm 0.75%;txiav cov cuab yeej xws li xyaum, kais, reamers, thiab lwm yam yog ua los ntawm steel nrog cov ntsiab lus carbon ntawm 0.90% mus rau 1.00%.
2.Classified los ntawm steel zoo
Raws li qhov zoo ntawm cov hlau, nws 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 kev lees paub ntawm kev xa khoom: Class A steel (Class A steel) yog cov hlau nrog cov khoom siv kho tshuab.Class B steel (Class B steel) yog cov hlau uas muaj cov tshuaj muaj pes tsawg leeg.Cov hlau tshwj xeeb (C-hom steel) yog cov hlau uas tau lees tias cov khoom siv kho tshuab thiab tshuaj lom neeg muaj pes tsawg leeg, thiab feem ntau siv los tsim cov khoom tseem ceeb.Tuam Tshoj tam sim no tsim thiab siv feem ntau A3 steel (Class A No. 3 steel) nrog cov ntsiab lus carbon ntawm li 0.20%, uas yog siv rau cov qauv engineering.
Qee cov pa roj carbon monoxide kuj ntxiv cov lej ntawm txhuas lossis niobium (lossis lwm yam carbide-forming ntsiab) los tsim nitrides lossis carbide hais kom txwv kev loj hlob ntawm cov nplej.Yog xav paub ntxiv txog CNC, tshawb cov pej xeem account "NC programming qhia" ntawm WeChat, Txhim kho cov hlau thiab txuag hlau.Hauv Suav teb thiab qee lub tebchaws, txhawm rau ua kom tau raws li cov cai tshwj xeeb ntawm cov kws tshaj lij steel, 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 hlau ua haujlwm ntawm cov qauv hlau zoo tib yam (xws li txuas hniav, vaj tse, Hlau tuav, steel rau siab hlab ntsha, thiab lwm yam).
(2) Piv nrog cov pa roj carbon monoxide zoo tib yam, cov pa roj carbon zoo steel muaj cov ntsiab lus qis ntawm sulfur, phosphorus thiab lwm yam tsis yog xim hlau.Raws li qhov sib txawv ntawm cov ntsiab lus thiab kev siv, cov hlau no tuaj yeem muab faib ua peb pawg:
① Tsawg dua 0.25% C yog cov hlau tsis muaj roj carbon tsawg, tshwj xeeb tshaj yog 08F thiab 08Al nrog cov ntsiab lus carbon tsawg dua 0.10%, yog siv los ua cov khoom sib sib zog nqus xws li tsheb thiab cov kaus poom vim lawv qhov sib sib zog nqus zoo thiab weldability ......tos .20G yog cov khoom tseem ceeb los ua cov boilers zoo tib yam.Tsis tas li ntawd, cov pa roj carbon tsawg kuj tau siv dav hauv cov hlau carburizing rau kev tsim khoom.
②0.25～0.60% C yog nruab nrab carbon steel, uas feem ntau yog siv nyob rau hauv lub quenched thiab tempered lub xeev los ua qhov chaw nyob rau hauv lub machinery manufacturing kev lag luam.
③ Ntau tshaj 0.6% C yog cov pa roj carbon siab, uas feem ntau yog siv rau hauv kev tsim cov springs, gears, yob, thiab lwm yam. %) thiab ntau dua manganese (0.7-1.0% thiab 0.9-1.2%).Manganese tuaj yeem txhim kho lub hardenability ntawm steel, ntxiv dag zog rau ferrite, thiab txhim kho lub zog tawm los, tensile zog thiab hnav tsis kam ntawm hlau.Feem ntau, lub cim "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.
3.Kev faib tawm los ntawm lub hom phiaj
Raws li daim ntawv thov, nws tuaj yeem muab faib ua carbon structural steel thiab carbon tool steel.
Carbon tool steel Cov ntsiab lus carbon yog nyob nruab nrab ntawm 0.65 thiab 1.35%.Tom qab kev kho cua sov, siab hardness thiab siab hnav kuj tuaj yeem tau txais.Nws yog siv los tsim ntau yam cuab yeej, cov cuab yeej txiav, pwm thiab ntsuas cov cuab yeej (saib cov cuab yeej steel).
Carbon structural steel muab faib ua 5 qib raws li lub zog ntawm cov hlau:
Q195, Q215, Q235, Q255, Q275
Txhua lub npe tau muab faib ua qib A, B, C, thiab D vim qhov zoo sib txawv.Muaj plaub hom feem ntau, thiab qee qhov tsuas muaj ib qho xwb;Tsis tas li ntawd, muaj qhov sib txawv ntawm txoj kev deoxidation ntawm steel smelting.
Txoj kev deoxygenation cim:
F - boiling hlau
b — semi-tua steel
Z-tua steel
TZ — tshwj xeeb tua hlau
Khoom siv ntawm cov hlau: Q195, Q235, 10#, 20#, 35#, 45#, Q215, Q235, Q345, 12Cr1Mov, 15CrMo, 304, 316, 20Cr, 40Cr, 20CrMo, 35CrNMo, 45CrNMo, , 50Mn, 50Cr, 3Cr2W8V, 20CrMnTi, 5CrMnMo, thiab lwm yam.
Post lub sij hawm: Jun-05-2023