I-Q345 iyimpahla yensimbi. Kuyinsimbi ephansi ye-alloy (C<0.2%), esetshenziswa kabanzi ekwakhiweni, amabhuloho, izimoto, imikhumbi, imikhumbi yokucindezela, njll. I-Q imelela amandla okukhiqiza alesi sici, futhi i-345 elandelayo ibhekisela ekuvuneni kwalesi sici, esingaba ngu-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 zesakhiwo seMetal jikelele, i-hot-rolled noma evamile, ingasetshenziswa ezakhiweni ezihlukahlukene ezindaweni ezibandayo ezingaphansi kuka -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