Q345 ke thepa ea tšepe.Ke tšepe e tlaase ea alloy (C <0.2%), e sebelisoang haholo kahong, marokho, likoloi, likepe, likepe tsa khatello, joalo-joalo Q e emela matla a lihlahisoa tsa thepa ena, 'me 345 e latelang e bua ka boleng ba lihlahisoa tsa sena. thepa, e ka bang 345 MPa.'Me boleng ba lihlahisoa bo tla fokotseha ka ho eketseha ha botenya ba thepa.
Q345 e na le thepa e ntle e felletseng ea mochini, ts'ebetso e amohelehang ea mocheso o tlase, polasetiki e ntle le weldability, 'me e sebelisoa e le meaho, likarolo tsa mochini, meaho ea meaho, likarolo tse akaretsang tsa Metal, tse kolobisitsoeng kapa tse tloaelehileng, li ka sebelisoa meahong e fapaneng libakeng tse batang tse ka tlase. -40°C.
Karolelano
Q345 e ka aroloa ka Q345A,Q345B, Q345C, Q345D, Q345E ho latela kereiti.Seo li se emelang haholo-holo ke mocheso oa ts'oaetso.
Q345A boemo, ha ho na tšusumetso;
Boemo ba Q345B, likhato tse 20 mocheso o tloaelehileng oa mocheso;
Boemo ba Q345C, ke phello ea 0 degree;
Boemo ba Q345D, ke -20 degree impact;
Boemo ba Q345E, ke -40 degree tshusumetso.
Lithempereichara tse fapaneng tsa ts'oaetso, litekanyetso tsa ts'oaetso le tsona li fapane.
sebopeho sa lik'hemik'hale
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;
khahlano le 16Mn
Q345 tšepe e nkela sebaka sa mefuta ea khale ea 12MnV, 14MnNb, 18Nb, 16MnRE, 16Mn le mefuta e meng ea tšepe, eseng feela sebaka sa tšepe ea 16Mn.Mabapi le sebopeho sa lik'hemik'hale, 16Mn le Q345 le tsona li fapane.Habohlokoa le ho feta, ho na le phapang e kholo ka boholo ba sehlopha sa botenya ba litšepe tse peli ho ea ka phapang ea matla a lihlahisoa, 'me sena se tla baka liphetoho khatellong e lumelletsoeng ea thepa e nang le botenya bo itseng.Ka hona, ha hoa lokela ho sebelisa feela khatello e lumelletsoeng ea tšepe ea 16Mn ho Q345 tšepe, empa khatello e amohelehang e lokela ho khethoa hape ho latela boholo ba sehlopha se secha sa botenya ba tšepe.
Karolo ea likarolo tsa mantlha tsa tšepe ea Q345 ha e le hantle e tšoana le ea tšepe ea 16Mn, phapang ke hore ho kenyelletsoa likarolo tsa alloy tsa V, Ti le Nb.Ntho e nyenyane ea V, Ti, le Nb alloying elements e ka ntlafatsa lijo-thollo, ea ntlafatsa haholo ho tiea ha tšepe, 'me ea ntlafatsa haholo thepa e feletseng ea mochine oa tšepe.Hape ke ka lebaka la sena hore botenya ba tšepe ea tšepe bo ka etsoa bo boholo.Ka hona, thepa e pharaletseng ea mochine oa tšepe ea Q345 e lokela ho ba molemo ho feta 16Mn tšepe, haholo-holo ts'ebetso ea eona e tlaase ea mocheso ha e fumanehe ka tšepe ea 16Mn.Khatello e lumelletsoeng ea tšepe ea Q345 e phahame hanyane ho feta ea tšepe ea 16Mn.
papiso ya tshebetso
Q345Dphala e se nang moroalothepa ea mechine:
Tensile matla: 490-675 Matla a tlhahiso: ≥345 Elongation: ≥22
Q345Bphala e se nang moroalothepa ea mechine:
Tensile matla: 490-675 Matla a tlhahiso: ≥345 Elongation: ≥21
Q345A thepa ea mochini oa lipeipi tse se nang moeli:
Tensile matla: 490-675 Matla a tlhahiso: ≥345 Elongation: ≥21
Q345C thepa ea mochini e se nang seamless:
Tensile matla: 490-675 Matla a tlhahiso: ≥345 Elongation: ≥22
Q345E thepa ea mochini e se nang seamless:
Tensile matla: 490-675 Matla a tlhahiso: ≥345 Elongation: ≥22
Letoto la Lihlahisoa
Q345D tšepe bapisoa le Q345A, B, C tšepe.Mocheso oa teko oa matla a matla a mocheso o tlase o tlase.Tshebetso e ntle.Palo ea lintho tse kotsi P le S e tlase ho feta ea Q345A, B le C. Theko ea 'maraka e phahametse Q345A, B, C.
Tlhaloso ea Q345D:
① E entsoe ka Q + nomoro + letšoao la kereiti ea boleng + letšoao la mokhoa oa deoxidation.Nomoro ea eona ea tšepe e etelletsoe pele ke "Q", e emelang ntlha ea lihlahisoa tsa tšepe, 'me palo e ka morao e emela boleng ba ntlha ea lihlahisoa ho MPa.Ka mohlala, Q235 e emela tšepe ea sebopeho sa carbon e nang le ntlha ea lihlahisoa (σs) ea 235 MPa.
②Haeba ho hlokahala, letšoao le bontšang boemo ba boleng le mokhoa oa deoxidation le ka tšoauoa ka mor'a nomoro ea tšepe.Matšoao a boemo ba boleng ke A, B, C, D ka ho latellana.Letšoao la mokhoa oa deoxidation: F e bolela tšepe e belang;b e bolela tšepe e bolailoeng ka halofo;Z e bolela tšepe e bolailoeng;TZ e bolela tšepe e khethehileng e bolailoeng, 'me tšepe e bolailoeng e ke ke ea tšoauoa ka matšoao, ke hore, Z le TZ li ka siuoa.Mohlala, Q235-AF e bolela tšepe e belang ea Kereiti A.
③ Tšepe ea carbon bakeng sa merero e khethehileng, joalo ka tšepe ea borokho, tšepe ea metsing, joalo-joalo, e sebelisa mokhoa oa polelo ea tšepe ea sebopeho sa carbon, empa lengolo le bontšang morero le eketsoa qetellong ea nomoro ea tšepe.
Kenyelletso ea lintho tse bonahalang
| element | C≤ | Mn | Si≤ | P≤ | S≤ | Al≥ | V | Nb | Ti |
| dikahare | 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 |
Thepa ea mochini ea Q345C ke e latelang (%):
| Mechanical properties index | Elongation(%) | Teko mocheso 0℃ | Matla a ho tsikitlanya MPa | Yield point MPa≥ |
| boleng | δ5≥22 | J≥34 | σb (470-650) | σ (324-259) |
Ha botenya ba lerako bo pakeng tsa 16-35mm, σs≥325Mpa;ha botenya ba lebota bo pakeng tsa 35-50mm, σs≥295Mpa
2. Litšobotsi tsa welding tsa tšepe ea Q345
2.1 Palo ea palo ea khabone (Ceq)
Ceq=C+Mn/6+Ni/15+Cu/15+Cr/5+Mo/5+V/5
Bala Ceq = 0.49%, e kholo ho feta 0.45%, ho ka bonoa hore ts'ebetso ea welding ea tšepe ea Q345 ha e ntle haholo, 'me mehato e tiileng ea thekenoloji e lokela ho etsoa nakong ea welding.
2.2 Mathata a atisang ho etsahala ka tšepe ea Q345 nakong ea welding
2.2.1 Tloaelo ea ho thatafala sebakeng se anngoeng ke mocheso
Nakong ea ts'ebetso ea ho tjheseletsa le ho pholile ha tšepe ea Q345, mohaho o tingoeng-martensite o thehoa habonolo sebakeng se amehileng ke mocheso, se eketsang boima le ho fokotsa polasetiki ea sebaka se haufi le seam.Phello ke mapetsong ka mor'a ho cheselletsa.
2.2.2 Kutloelo-bohloko e batang ea crack
Mapetso a tjheseletsa a tšepe ea Q345 ke mapetso a batang haholo.
Nako ea poso: Mar-20-2023