I-Q345 iyimpahla yensimbi.Insimbi ephansi ye-alloy (C<0.2%), esetshenziswa kabanzi ekwakhiweni, amabhuloho, izimoto, imikhumbi, imikhumbi yokucindezela, njll. I-Q imele amandla okukhiqiza alesi sici, futhi i-345 elandelayo ibhekisela enanini lesivuno salokhu. impahla, okungama-345 MPa.Futhi inani lesivuno lizokwehla ngokunyuka kokuqina kwezinto ezibonakalayo.
I-Q345 inezici ezinhle ezibanzi zemishini, ukusebenza okuphansi kwezinga lokushisa okwamukelekayo, ipulasitiki enhle kanye nokushisela, futhi isetshenziswa njengezakhiwo, izingxenye zemishini, izakhiwo zokwakha, izingxenye ezijwayelekile zeMetal, ezigoqiwe noma ezijwayelekile, zingasetshenziswa ezakhiweni ezahlukahlukene ezindaweni ezibandayo ezingezansi. -40°C.
Ukwahlukanisa
I-Q345 ingahlukaniswa i-Q345A,Q345B, Q345C, Q345D, Q345E ngokwezinga.Okumelela ngokuyinhloko izinga lokushisa lokushaqeka.
Izinga le-Q345A, akukho mthelela;
Izinga le-Q345B, ama-degree angu-20 umthelela ojwayelekile wokushisa;
Izinga le-Q345C, liwumthelela ongu-0 degree;
Izinga le-Q345D, liyi--20 degree umthelela;
Izinga le-Q345E, lingu--40 degree umthelela.
Emazingeni okushisa ahlukene okushaqeka, amanani okushaqeka nawo ahlukile.
ukwakheka kwamakhemikhali
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 yemikhiqizo emidala ye-12MnV, 14MnNb, 18Nb, 16MnRE, 16Mn nezinye izinhlobo zensimbi, hhayi nje ukufaka esikhundleni sensimbi engu-16Mn.Mayelana nokwakhiwa kwamakhemikhali, i-16Mn ne-Q345 nayo ihlukile.Okubaluleke nakakhulu, kunomehluko omkhulu kusayizi weqembu lokujiya lezinsimbi ezimbili ngokuvumelana nomehluko wamandla esivuno, futhi lokhu kuzodala izinguquko nakanjani ekucindezelekeni okuvumelekile kwezinto ezinobukhulu obuthile.Ngakho-ke, akufanelekile ukumane usebenzise ukucindezeleka okuvumelekile kwensimbi engu-16Mn kunsimbi ye-Q345, kodwa ukucindezeleka okuvunyelwe kufanele kuphinde kunqunywe ngokuvumelana nosayizi weqembu elisha lokujiya.
Ingxenye yezakhi eziyinhloko zensimbi ye-Q345 ngokuyisisekelo iyafana naleyo yensimbi engu-16Mn, umehluko ukuthi izakhi zokulandelela ze-alloy ze-V, Ti ne-Nb zengezwa.Inani elincane lezakhi ze-alloying ze-V, Ti, ne-Nb lingacwengisa okusanhlamvu, lithuthukise kakhulu ukuqina kwensimbi, futhi lithuthukise kakhulu izici zemishini ezibanzi zensimbi.Kungenxa yalokhu ukuthi ukushuba kwepuleti lensimbi kungenziwa kukhudlwana.Ngakho-ke, izici ezibanzi zemishini yensimbi ye-Q345 kufanele ibe ngcono kunensimbi engu-16Mn, ikakhulukazi ukusebenza kwayo okuphansi kwezinga lokushisa akutholakali ngensimbi engu-16Mn.Ingcindezi evumelekile yensimbi ye-Q345 iphakeme kancane kunaleyo yensimbi engu-16Mn.
ukuqhathanisa ukusebenza
Q345Dipayipi elingenamthungoizakhiwo zemishini:
Amandla okuqina: 490-675 Amandla okukhiqiza: ≥345 Ubude: ≥22
Q345Bipayipi elingenamthungoizakhiwo zemishini:
Amandla okuqina: 490-675 Amandla okukhiqiza: ≥345 Ubude: ≥21
I-Q345A izakhiwo zamapayipi ezingenamthungo:
Amandla okuqina: 490-675 Amandla okukhiqiza: ≥345 Ubude: ≥21
I-Q345C izakhiwo zamapayipi ezingenamthungo:
Amandla okuqina: 490-675 Amandla okukhiqiza: ≥345 Ubude: ≥22
I-Q345E impahla yepayipi engenamthungo:
Amandla okuqina: 490-675 Amandla okukhiqiza: ≥345 Ubude: ≥22
Uchungechunge Lomkhiqizo
Insimbi ye-Q345D uma iqhathaniswa nensimbi ye-Q345A, B, C.Izinga lokushisa lokuhlola lamandla omthelela wezinga lokushisa eliphansi liphansi.Ukusebenza okuhle.Inani lezinto eziyingozi u-P no-S liphansi kunalelo le-Q345A, B kanye no-C. Intengo yemakethe ingaphezu kuka-Q345A, B, C.
Incazelo ye-Q345D:
① Ihlanganiswe no-Q + inombolo + uphawu lwebanga lekhwalithi + uphawu lwendlela yokukhishwa kwe-oxidation.Inombolo yayo yensimbi yandulelwa "Q", emele iphuzu lokukhiqiza lensimbi, futhi inombolo ngemuva kwayo imelela inani lephoyinti lokukhiqiza ku-MPa.Isibonelo, i-Q235 imele insimbi yesakhiwo sekhabhoni enephuzu lokukhiqiza (σs) lama-235 MPa.
②Uma kunesidingo, uphawu olubonisa izinga lekhwalithi nendlela yokukhipha amanzi emzimbeni lungamakwa ngemuva kwenombolo yensimbi.Izimpawu zebanga lekhwalithi ngu-A, B, C, D ngokulandelanayo.Uphawu lwendlela ye-deoxidation: F usho insimbi ebilayo;b kusho insimbi ebulewe kancane;Z kusho insimbi ebulewe;I-TZ isho insimbi ebulewe ekhethekile, futhi insimbi ebulewe ayikwazi ukumakwa ngezimpawu, okungukuthi, kokubili u-Z no-TZ kungashiywa.Isibonelo, i-Q235-AF isho insimbi ebilayo yeBanga A.
③ Insimbi yekhabhoni ngezinjongo ezikhethekile, njengensimbi yebhuloho, insimbi yasolwandle, njll., ngokuyisisekelo isebenzisa indlela yokubonisa yensimbi yesakhiwo sekhabhoni, kodwa uhlamvu olubonisa injongo luyengezwa ekugcineni kwenombolo yensimbi.
Isingeniso esibalulekile
| isici | C≤ | Mn | Si≤ | P≤ | S≤ | Al≥ | V | Nb | Ti |
| okuqukethwe | 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 |
Izakhiwo zemishini ze-Q345C zimi kanje (%):
| Inkomba yezakhiwo zemishini | Ubude(%) | Izinga lokushisa lokuhlola ngu-0℃ | Amandla e-MPa aqinile | Iphoyinti lokukhiqiza i-MPa≥ |
| inani | δ5≥22 | J≥34 | σb (470-650) | σ (324-259) |
Lapho ukujiya kodonga kuphakathi kuka-16-35mm, σs≥325Mpa;lapho ukujiya kodonga kuphakathi kuka-35-50mm, σs≥295Mpa
2. Izici zokushisela zensimbi ye-Q345
2.1 Ukubalwa kwe-carbon equivalent (Ceq)
Ceq=C+Mn/6+Ni/15+Cu/15+Cr/5+Mo/5+V/5
Bala i-Ceq = 0.49%, enkulu kune-0.45%, kungabonakala ukuthi ukusebenza kokushisela kwe-Q345 steel akukuhle kakhulu, futhi izinyathelo zobuchwepheshe eziqinile zidinga ukwakhiwa ngesikhathi sokushisela.
2.2 Izinkinga ezivame ukwenzeka ku-Q345 steel ngesikhathi sokushisela
2.2.1 Ukuthambekela kokuqina endaweni ethinteke ukushisa
Ngesikhathi se-welding kanye nenqubo yokupholisa yensimbi ye-Q345, isakhiwo esicishiwe-martensite senziwa kalula endaweni ethintekayo ekushiseni, okwandisa ubulukhuni futhi kunciphise ipulasitiki yendawo eseduze.Umphumela uba imifantu ngemva kokushisela.
2.2.2 Ukuzwela ukuqhekeka okubandayo
Imifantu yokushisela yensimbi ye-Q345 ikakhulukazi imifantu ebandayo.
Isikhathi sokuthumela: Mar-20-2023