Q345 ndi zinthu zachitsulo.Ndizitsulo zotsika kwambiri (C<0.2%), zomwe zimagwiritsidwa ntchito kwambiri pomanga, milatho, magalimoto, zombo, zombo zoponderezedwa, etc. Q imayimira mphamvu zokolola za nkhaniyi, ndipo zotsatirazi 345 zimatanthawuza mtengo wa zokolola za izi. zakuthupi, zomwe ndi za 345 MPa.Ndipo mtengo wa zokolola udzachepa ndi kuwonjezeka kwa makulidwe a zinthu.
Q345 ili ndi zida zamakina abwino, zovomerezeka zotsika kutentha, pulasitiki yabwino komanso kuwotcherera, ndipo imagwiritsidwa ntchito ngati zomangira, zida zamakina, zomanga, zomangira zachitsulo, zopindika kapena zokhazikika, zitha kugwiritsidwa ntchito m'malo osiyanasiyana m'malo ozizira pansipa. -40 ° C.
Gulu
Q345 akhoza kugawidwa mu Q345A,Q345B, Q345C, Q345D, Q345E malinga ndi kalasi.Zomwe zimayimira makamaka kutentha kwa mantha.
Q345A mlingo, palibe zotsatira;
Q345B mlingo, 20 madigiri yachibadwa kutentha zotsatira;
Q345C mlingo, ndi 0 digiri zotsatira;
Q345D mlingo, ndi -20 digiri zotsatira;
Q345E mlingo, ndi -40 digiri zotsatira.
Pa kutentha kosiyanasiyana kodabwitsa, zikhalidwe zododometsa zimasiyananso.
mankhwala opangidwa
Q345A:C≤0.20,Mn ≤1.7，Si≤0.55，P≤0.045，S≤0.045，V 0.02~0.15;
Q345B:C≤0.20, Mn ≤1.7，Si≤0.55，P≤0.040，S≤0.040，V 0.02~0.15;
Q345C:C≤0.20，Mn ≤1.7，Si≤0.55，P≤0.035，S≤0.035，V 0.02~0.15，Al≥0.015;
Q345D:C≤0.20，Mn ≤1.7，Si≤0.55，P≤0.030，S≤0.030，V 0.02~0.15，Al≥0.015;
Q345E:C≤0.20，Mn ≤1.7，Si≤0.55，P≤0.025，S≤0.025，V 0.02~0.15，Al≥0.015;
motsutsana ndi 16Mn
Chitsulo cha Q345 ndi cholowa m'malo mwa mitundu yakale ya 12MnV, 14MnNb, 18Nb, 16MnRE, 16Mn ndi mitundu ina yazitsulo, osati kungolowa m'malo mwa zitsulo za 16Mn.Pankhani ya mankhwala, 16Mn ndi Q345 ndizosiyana.Chofunika kwambiri, pali kusiyana kwakukulu mu kukula kwa gulu la makulidwe azitsulo ziwirizo malingana ndi kusiyana kwa mphamvu zokolola, ndipo izi zidzachititsa kusintha kwa kupanikizika kovomerezeka kwa zipangizo ndi makulidwe ena.Choncho, sikoyenera kungoyika kupanikizika kovomerezeka kwa chitsulo cha 16Mn ku Q345 chitsulo, koma kupanikizika kovomerezeka kuyenera kutsimikiziridwanso molingana ndi kukula kwa gulu latsopano lachitsulo.
Gawo lazinthu zazikulu za Q345 zitsulo ndizofanana ndi zitsulo za 16Mn, kusiyana kwake ndikuti kufufuza zinthu za alloy V, Ti ndi Nb zimawonjezeredwa.Kuchepa kwa V, Ti, ndi Nb alloying zinthu kumatha kuyeretsa mbewu, kumapangitsa kuti chitsulo chikhale cholimba, ndikuwongolera kwambiri zida zamakina azitsulo.Ndi chifukwa cha ichi kuti makulidwe a mbale yachitsulo akhoza kukhala aakulu.Chifukwa chake, zida zonse zamakina a Q345 zitsulo ziyenera kukhala zabwinoko kuposa zitsulo za 16Mn, makamaka kutentha kwake kochepa sikupezeka muzitsulo za 16Mn.Kupanikizika kovomerezeka kwachitsulo cha Q345 ndikokwera pang'ono kuposa chitsulo cha 16Mn.
kufananiza ntchito
Q345Dchitoliro chopanda msokomakina katundu:
Mphamvu yolimba: 490-675 Mphamvu zokolola: ≥345 Elongation: ≥22
Q345Bchitoliro chopanda msokomakina katundu:
Kukhazikika kwamphamvu: 490-675 Mphamvu zokolola: ≥345 Elongation: ≥21
Q345A makina a chitoliro opanda msoko:
Kukhazikika kwamphamvu: 490-675 Mphamvu zokolola: ≥345 Elongation: ≥21
Q345C wopanda chitoliro makina makina katundu:
Mphamvu yolimba: 490-675 Mphamvu zokolola: ≥345 Elongation: ≥22
Q345E wopanda chitoliro makina makina katundu:
Mphamvu yolimba: 490-675 Mphamvu zokolola: ≥345 Elongation: ≥22
Product Series
Q345D zitsulo poyerekeza ndi Q345A, B, C zitsulo.Kutentha koyesa kwa mphamvu yotsika ndi yotsika.Kuchita bwino.Kuchuluka kwa zinthu zovulaza P ndi S ndizotsika kuposa za Q345A, B ndi C. Mtengo wamsika ndi wapamwamba kuposa Q345A, B, C.
Tanthauzo la Q345D:
① Wopangidwa ndi Q + nambala + chizindikiro cha kalasi yabwino + chizindikiro cha deoxidation.Nambala yake yachitsulo imatsogoleredwa ndi "Q", yomwe imayimira zokolola zachitsulo, ndipo nambala yomwe ili kumbuyo kwake imayimira mtengo wa zokolola mu MPa.Mwachitsanzo, Q235 imayimira chitsulo chopangidwa ndi mpweya chokhala ndi mfundo yotulutsa (σs) ya 235 MPa.
②Ngati kuli kofunikira, chizindikiro chosonyeza kalasi yabwino ndi njira yochotsera chitsulo chikhoza kulembedwa kumbuyo kwa nambala yachitsulo.Zizindikiro zamakalasi apamwamba ndi A, B, C, D motsatana.Chizindikiro cha njira yochotsera mpweya: F amatanthauza chitsulo chowira;b amatanthauza theka-anaphedwa chitsulo;Z amatanthauza chitsulo chophedwa;TZ imatanthawuza chitsulo chapadera chophedwa, ndipo chitsulo chophedwa sichikhoza kulembedwa ndi zizindikiro, ndiye kuti, Z ndi TZ zonse zikhoza kuchotsedwa.Mwachitsanzo, Q235-AF amatanthauza Gulu A zitsulo zowira.
③ Chitsulo cha carbon pazifukwa zapadera, monga chitsulo cha mlatho, zitsulo zam'madzi, ndi zina zotero, makamaka zimagwiritsa ntchito njira yofotokozera za carbon structural steel, koma chilembo chosonyeza cholingacho chimawonjezedwa kumapeto kwa nambala yachitsulo.
Mau oyamba
| chinthu | C≤ | Mn | Si≤ | P≤ | S≤ | Al≥ | V | Nb | Ti |
| zomwe zili | 0.2 | 1.0-1.6 | 0.55 | 0.035 | 0.035 | 0.015 | 0.02-0.15 | 0.015-0.06 | 0.02-0.2 |
Makina a Q345C ndi awa (%):
| Mechanical Properties index | Kutalikira (%) | Kutentha kwa mayeso 0 ℃ | Mphamvu yamphamvu MPa | Zokolola za MPa≥ |
| mtengo | δ5≥22 | J≥34 | masamba (470-650) | s (324-259) |
Pamene makulidwe a khoma ali pakati pa 16-35mm, σs≥325Mpa;pamene makulidwe a khoma ali pakati pa 35-50mm, σs≥295Mpa
2. Kuwotcherera makhalidwe a Q345 zitsulo
2.1 Kuwerengera kwa kaboni wofanana (Ceq)
Ceq=C+Mn/6+Ni/15+Cu/15+Cr/5+Mo/5+V/5
Werengani Ceq = 0.49%, wamkulu kuposa 0.45%, zitha kuwoneka kuti kuwotcherera kwa Q345 chitsulo sikwabwino kwambiri, ndipo njira zolimba zaukadaulo ziyenera kupangidwa panthawi yowotcherera.
2.2 Mavuto omwe amatha kuchitika muzitsulo za Q345 panthawi yowotcherera
2.2.1 Chizoloŵezi choumitsa m'dera lomwe lakhudzidwa ndi kutentha
Panthawi yowotcherera ndi kuziziritsa kwachitsulo cha Q345, chozimitsidwa-martensite chimapangidwa mosavuta m'dera lomwe limakhudzidwa ndi kutentha, zomwe zimawonjezera kuuma komanso kuchepetsa pulasitiki ya pafupi ndi msoko.Zotsatira zake ndi ming'alu pambuyo kuwotcherera.
2.2.2 Kumva kuzizira kwa mng'alu
The kuwotcherera ming'alu Q345 zitsulo makamaka ozizira ming'alu.
Nthawi yotumiza: Mar-20-2023