Zitsulo Zozungulira (Round Bar Steel)

Kugawa ndi ndondomeko
Chitsulo chozungulira chimayikidwa ngati chotenthedwa, chopukutira komanso chozizira.Chitsulo chozungulira chotentha ndi 5.5-250 mm kukula kwake.Pakati pawo: 5.5-25 mamilimita ang'onoang'ono kuzungulira zitsulo makamaka zowongoka n'kupanga mitolo katundu, ambiri ntchito kulimbikitsa mipiringidzo, mabawuti ndi mbali zosiyanasiyana makina;Round zitsulo zokulirapo kuposa 25 mm, makamaka ntchito kupanga mbali makina, osataya chitsulo chitoliro billet, etc.
Zosankhidwa ndi mankhwala
Mpweya zitsulo akhoza kugawidwa mu low carbon zitsulo, sing'anga mpweya zitsulo ndi mkulu mpweya zitsulo malinga ndi zikuchokera mankhwala (ie mpweya zili).
(1) Chitsulo chochepa
Amatchedwanso wofatsa zitsulo, okhutira mpweya kuchokera 0,10% kuti 0.30% Low mpweya zitsulo n'zosavuta kuvomereza zosiyanasiyana processing monga forging, kuwotcherera ndi kudula, nthawi zambiri ntchito kupanga unyolo, rivets, mabawuti, shafts, etc.
(2) Chitsulo chapakati cha carbon
Mpweya wa carbon 0,25% ~ 0.60% carbon steel.Pali zitsulo sedative, theka-sedative zitsulo, otentha zitsulo ndi mankhwala ena.Kupatula kaboni, ilinso ndi manganese pang'ono (0.70% ~ 1.20%).Malinga ndi khalidwe la mankhwala anawagawa wamba mpweya structural zitsulo ndi apamwamba mpweya structural zitsulo.Kugwira ntchito bwino kwamafuta ndi kudula, kusagwira bwino ntchito kuwotcherera.Mphamvu ndi kuuma kwake ndikwapamwamba kuposa chitsulo chochepa cha carbon, koma pulasitiki ndi kulimba ndizotsika kuposa chitsulo chochepa cha carbon.Zida zotentha zotentha komanso zozizira zimatha kugwiritsidwa ntchito mwachindunji popanda chithandizo cha kutentha kapena pambuyo pa chithandizo cha kutentha.Sing'anga mpweya zitsulo pambuyo kuzimitsa ndi kutentha ali wabwino mabuku mawotchi katundu.Kulimba kwapamwamba kwambiri komwe kunachitika ndi pafupifupi HRC55(HB538), σb ndi 600 ~ 1100MPa.Choncho mu sing'anga mphamvu mlingo wa ntchito zosiyanasiyana, sing'anga mpweya zitsulo ndi ambiri ankagwiritsa ntchito, kuwonjezera monga zomangira, komanso ambiri ntchito popanga mbali zosiyanasiyana makina.
(3) Chitsulo chachikulu cha carbon
Zomwe nthawi zambiri zimatchedwa chitsulo chachitsulo, zomwe zimakhala ndi carbon zimachokera ku 0.60% mpaka 1.70% ndipo zimatha kuumitsidwa ndi kupsya mtima.Nyundo ndi khwangwala zimapangidwa ndi chitsulo chokhala ndi mpweya wa 0.75%.Zida zodulira monga kubowola, tap, reamer, ndi zina zambiri zimapangidwa kuchokera kuchitsulo chokhala ndi mpweya wa 0.90% mpaka 1.00%.

Gulu ndi khalidwe lachitsulo
Malinga ndi khalidwe la zitsulo akhoza kugawidwa mu wamba mpweya zitsulo ndi apamwamba mpweya zitsulo.
(1) Wamba mpweya structural zitsulo, amatchedwanso wamba mpweya zitsulo, ali ndi malire lonse pa okhutira mpweya, osiyanasiyana ntchito ndi zili phosphorous, sulfure ndi zinthu zina zotsalira.Ku China ndi maiko ena, amagawidwa m'magulu atatu malinga ndi momwe amaperekera motsimikizika: Gulu A chitsulo ndi chitsulo chokhala ndi makina otsimikizika.Zitsulo za Gulu B (Zitsulo za Gulu B) ndi zitsulo zokhala ndi mankhwala otsimikizika.Zitsulo zapadera (Zitsulo za Gulu C) ndizitsulo zomwe zimatsimikizira zonse zamakina ndi kapangidwe ka mankhwala, ndipo nthawi zambiri zimagwiritsidwa ntchito popanga magawo ofunikira kwambiri.China imapanga ndikugwiritsa ntchito kwambiri A3 zitsulo (Class A No.3 zitsulo) zomwe zimakhala ndi carbon pafupifupi 0,20%, zomwe zimagwiritsidwa ntchito makamaka muzomangamanga.
Zitsulo zina za carbon structural zimawonjezeranso aluminiyamu kapena niobium (kapena zinthu zina zopanga carbide) kupanga tinthu tating'onoting'ono ta nitride kapena carbide, kuti tichepetse kukula kwambewu, kulimbitsa chitsulo, kupulumutsa chitsulo.Ku China ndi maiko ena, kuti akwaniritse zofunikira zapadera za zitsulo zamaluso, mankhwala opangidwa ndi chitsulo cha carbon structural asinthidwa, motero akupanga zitsulo zamtundu wa carbon structural kuti zigwiritsidwe ntchito (monga mlatho, zomangamanga, rebar, pressure chombo chitsulo, etc.).
(2) Poyerekeza ndi wamba mpweya structural zitsulo, zili sulfure, phosphorous ndi inclusions ena sanali zitsulo mu apamwamba mpweya structural zitsulo ndi otsika.Malinga ndi zomwe zili ndi kaboni komanso kugwiritsa ntchito kosiyanasiyana, chitsulo chamtunduwu chimagawika m'magulu atatu:
① Pansi pa 0.25% C ndi chitsulo chochepa cha carbon, makamaka chokhala ndi mpweya wochepera 0.10% wa 08F,08Al, chifukwa cha zojambula zake zakuya komanso zowotcherera ndipo zimagwiritsidwa ntchito kwambiri ngati zojambula zakuya monga magalimoto, zitini..... 20G ndizinthu zazikulu zama boiler wamba.Kuphatikiza apo, chitsulo chofatsa chimagwiritsidwanso ntchito kwambiri ngati chitsulo cha carburizing, chomwe chimagwiritsidwa ntchito popanga makina.
②0.25 ~ 0.60% C ndi sing'anga mpweya zitsulo, makamaka ntchito mu chikhalidwe kutentha, kupanga mbali mu makampani kupanga makina.
(3) Kuposa 0.6% C ndi mkulu mpweya zitsulo, makamaka ntchito popanga akasupe, magiya, masikono, etc.
Malinga ndi zomwe zili ndi manganese, zitha kugawidwa m'magulu wamba a manganese (0.25 ~ 0.8%) ndi manganese ambiri (0.7 ~ 1.0% ndi 0.9 ~ 1.2%) gulu lachitsulo.Manganese amatha kusintha kuuma kwachitsulo, kulimbitsa ferrite, kupititsa patsogolo mphamvu zokolola, mphamvu zamakokedwe komanso kuvala kukana kwachitsulo.Nthawi zambiri, "Mn" amawonjezedwa pambuyo pa kalasi yachitsulo yokhala ndi manganese ambiri, monga 15Mn ndi 20Mn, kuti asiyanitse ndi chitsulo cha kaboni chokhala ndi manganese wamba.