I-Q345 yinto yentsimbi.Yintsimbi ephantsi kwe-alloy (C<0.2%), esetyenziswa ngokubanzi ekwakhiweni, iibhulorho, izithuthi, iinqanawa, iinqanawa zoxinzelelo, njl njl. Q imele amandla okuvelisa le nto, kwaye i-345 ilandelayo ibhekisela kwixabiso lemveliso yale nto. impahla, malunga 345 MPa.Kwaye ixabiso lesivuno liya kuncipha ngokunyuka kwezinto eziphathekayo.
I-Q345 ineepropati ezilungileyo ezibanzi zoomatshini, ukusebenza kobushushu obuphantsi okwamkelekileyo, iplastiki elungileyo kunye ne-weldability, kwaye isetyenziswa njengezakhiwo, iinxalenye zoomatshini, izakhiwo zokwakha, iinxalenye zeMetal ngokubanzi, i-hot-rolled okanye i-normalized, ingasetyenziswa kwizakhiwo ezahlukeneyo kwimimandla ebandayo engezantsi. -40°C.
Ukuhlelwa
I-Q345 inokwahlulwa ibe yi-Q345A,Q345B, Q345C, Q345D, Q345E ngokwebakala.Into abayimeleyo ubukhulu becala bubushushu bomothuko.
Inqanaba le-Q345A, akukho mpembelelo;
Inqanaba le-Q345B, i-20 degrees impembelelo yeqondo lokushisa eliqhelekileyo;
Inqanaba le-Q345C, yimpembelelo ye-0 degree;
Inqanaba le-Q345D, liyi-20 impembelelo yeqondo;
Inqanaba le-Q345E, liyi-40 impembelelo ye-degree.
Kubushushu bomothuko ohlukeneyo, amaxabiso othuso nawo ahlukile.
ukwakheka kweekhemikhali
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;
vs. 16Mn
Insimbi ye-Q345 ithatha indawo yeempawu zakudala ze-12MnV, 14MnNb, 18Nb, 16MnRE, 16Mn kunye nezinye iintlobo zetsimbi, kungekhona nje indawo ye-16Mn yensimbi.Ngokumalunga nokubunjwa kweekhemikhali, i-16Mn kunye ne-Q345 nazo zihluke.Okubaluleke ngakumbi, kukho umehluko omkhulu kubukhulu beqela leentsimbi ezimbini ngokomahluko kumandla esivuno, kwaye oku kuya kubangela utshintsho kuxinzelelo oluvumelekileyo lwezinto ezinobunzima obuthile.Ngoko ke, akufanelekanga ukusebenzisa nje uxinzelelo oluvumelekileyo lwensimbi ye-16Mn kwi-Q345 yensimbi, kodwa uxinzelelo oluvumelekileyo kufuneka luphinde lugqitywe ngokuhambelana nobukhulu beqela elitsha lentsimbi.
Umlinganiselo wezinto eziphambili ze-Q345 zensimbi zifana nentsimbi ye-16Mn, umahluko kukuba ukulandelela izinto ze-alloy ze-V, i-Ti kunye ne-Nb zongezwa.Ixabiso elincinci le-V, i-Ti, kunye ne-Nb ye-alloying elements inokucoca iinkozo, iphucule kakhulu ukuqina kwetsimbi, kwaye iphucule kakhulu iimpawu zomatshini ezibanzi zetsimbi.Kwakhona ngenxa yale nto ukuba ubukhulu bentsimbi yentsimbi bunokwenziwa bukhulu.Ngoko ke, iipropati ezibanzi ze-mechanical ze-Q345 zensimbi kufuneka zibe ngcono kunentsimbi ye-16Mn, ngokukodwa ukusebenza kwayo okuphantsi kweqondo lokushisa akufumaneki kwi-16Mn yensimbi.Uxinzelelo oluvumelekileyo lwe-Q345 yensimbi luphezulu kancinane kune-16Mn yensimbi.
uthelekiso lokusebenza
Q345Dumbhobho ongenamthungoiimpawu zoomatshini:
Amandla okuqina: 490-675 Amandla okuvelisa: ≥345 Elongation: ≥22
Q345Bumbhobho ongenamthungoiimpawu zoomatshini:
Amandla okuqina: 490-675 Amandla esivuno: ≥345 Elongation: ≥21
I-Q345A ingenamthungo yeempawu zoomatshini:
Amandla okuqina: 490-675 Amandla esivuno: ≥345 Elongation: ≥21
I-Q345C ingenamthungo yeempawu zoomatshini:
Amandla okuqina: 490-675 Amandla okuvelisa: ≥345 Elongation: ≥22
I-Q345E ingenamthungo yeempawu zoomatshini:
Amandla okuqina: 490-675 Amandla okuvelisa: ≥345 Elongation: ≥22
Series Product
Intsimbi ye-Q345D xa kuthelekiswa ne-Q345A, B, C yentsimbi.Ubushushu bovavanyo lwamandla empembelelo yobushushu obuphantsi buphantsi.Ukusebenza kakuhle.Ubungakanani bezinto ezinobungozi ze-P kunye ne-S ziphantsi kune-Q345A, B kunye ne-C. Ixabiso lemarike liphezulu kune-Q345A, B, C.
Inkcazo ye-Q345D:
① Iqulunqwe ngu-Q + inombolo + isimboli yebakala lomgangatho + isimboli yendlela yokukhupha ityhefu.Inombolo yayo yentsimbi ilandelwa yi "Q", emele isivuno sentsimbi, kwaye inombolo emva kwayo imele ixabiso lemveliso kwi-MPa.Ngokomzekelo, i-Q235 imele insimbi ye-carbon structural point point isivuno (σs) ye-235 MPa.
②Ukuba kuyimfuneko, isimboli esibonisa umgangatho womgangatho kunye nendlela ye-deoxidation inokumakishwa emva kwenombolo yentsimbi.Iisimboli zebakala ezisemgangathweni ngu-A, B, C, D ngokulandelelanayo.Isimboli yendlela yokukhupha amanzi emzimbeni: F uthetha intsimbi ebilayo;b kuthetha intsimbi ebulewe ngokungenasiphelo;U-Z uthetha intsimbi ebuleweyo;I-TZ ithetha intsimbi ekhethekileyo ebuleweyo, kwaye intsimbi ebulewe ayinakuphawulwa ngeempawu, oko kukuthi, zombini i-Z kunye ne-TZ inokukhutshwa.Umzekelo, i-Q235-AF ithetha iBanga A intsimbi ebilisayo.
③ Intsimbi yeCarbon ngeenjongo ezikhethekileyo, njengentsimbi yebhulorho, intsimbi yaselwandle, njl. njl., ngokusisiseko isebenzisa indlela yokubonakalisa intsimbi yekhabhoni, kodwa unobumba obonisa injongo yongezwa ekupheleni kwenombolo yentsimbi.
Intshayelelo yezinto
| isiqalelo | C≤ | Mn | Si≤ | P≤ | S≤ | Al≥ | V | Nb | Ti |
| umxholo | 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 |
Iimpawu zoomatshini ze-Q345C zezi zilandelayo (%):
| Isalathisi seepropati zoomatshini | Ubude (%) | Uvavanyo lobushushu 0℃ | Ukuqina kweMPa | Inqaku lesivuno MPa≥ |
| ixabiso | δ5≥22 | J≥34 | σb (470-650) | σ (324-259) |
Xa ubukhulu bodonga buphakathi kwe-16-35mm, σs≥325Mpa;xa ubukhulu bodonga buphakathi kwe-35-50mm, σs≥295Mpa
2. Iimpawu ze-Welding ze-Q345 zensimbi
2.1 Ukubalwa kwekhabhoni elinganayo (Ceq)
Ceq=C+Mn/6+Ni/15+Cu/15+Cr/5+Mo/5+V/5
Bala i-Ceq = 0.49%, enkulu kune-0.45%, kunokubonwa ukuba ukusebenza kwe-welding ye-Q345 yensimbi ayilungile kakhulu, kwaye amanyathelo angqongqo ezobuchwepheshe kufuneka aqulunqwe ngexesha lokudibanisa.
2.2 Iingxaki ezinokuthi zenzeke kwi-Q345 yensimbi ngexesha le-welding
2.2.1 Ukuthambekela kokuqina kwindawo echatshazelwe bubushushu
Ngethuba le-welding kunye nenkqubo yokupholisa ye-Q345 yensimbi, isakhiwo esicinyiweyo-martensite senziwa ngokulula kwindawo echaphazelekayo yokushisa, eyandisa ubunzima kunye nokunciphisa iplastiki yendawo esondeleyo.Isiphumo kukuqhekeka emva kwe-welding.
2.2.2 Ubuzaza becrack ebandayo
Iintanda ze-welding ze-Q345 zentsimbi ziyi-cracks ezibandayo.
Ixesha lokuposa: Mar-20-2023