Q345 yog cov khoom siv hlau. Nws yog cov hlau tsis tshua muaj hlau (C <0.2%), siv dav hauv kev tsim kho, choj, tsheb, nkoj, cov hlab siab, thiab lwm yam. Q sawv cev rau lub zog ntawm cov khoom siv no, thiab 345 hauv qab no yog hais txog tus nqi ntawm cov khoom siv no, uas yog li 345 MPa. Thiab tus nqi ntawm cov khoom siv yuav txo qis nrog rau qhov nce ntawm cov khoom siv tuab.
Q345 muaj cov khoom siv kho tshuab zoo, kev ua haujlwm kub qis, kev ua tau zoo thiab kev vuam zoo, thiab siv los ua cov qauv, cov khoom siv kho tshuab, cov qauv tsev, cov khoom siv hlau dav dav, kub-dov lossis normalized, tuaj yeem siv rau hauv ntau yam qauv hauv thaj chaw txias hauv qab -40 ° C.
Kev faib tawm
Q345 tuaj yeem muab faib ua Q345A,Q345B, Q345C, Q345D, Q345E raws li qib. Qhov lawv sawv cev yog qhov kub ntawm qhov poob siab feem ntau.
Qib Q345A, tsis muaj kev cuam tshuam;
Q345B theem, 20 degrees qhov kub thiab txias ib txwm muaj;
Qib Q345C, yog 0 degree cuam tshuam;
Qib Q345D, yog -20 degree cuam tshuam;
Qib Q345E, yog -40 degree cuam tshuam.
Ntawm qhov kub sib txawv, cov nqi poob siab kuj txawv.
tshuaj lom neeg muaj pes tsawg leeg
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;
piv rau 16Mn
Q345 hlau yog ib qho kev hloov pauv rau cov hom qub ntawm 12MnV, 14MnNb, 18Nb, 16MnRE, 16Mn thiab lwm hom hlau, tsis yog tsuas yog hloov pauv rau 16Mn hlau xwb. Hais txog cov tshuaj lom neeg sib xyaw, 16Mn thiab Q345 kuj txawv. Qhov tseem ceeb tshaj, muaj qhov sib txawv loj hauv pawg tuab ntawm ob lub hlau raws li qhov sib txawv ntawm lub zog tawm los, thiab qhov no yuav ua rau muaj kev hloov pauv ntawm kev ntxhov siab tso cai ntawm cov ntaub ntawv nrog qee qhov tuab. Yog li ntawd, nws tsis tsim nyog los siv kev ntxhov siab tso cai ntawm 16Mn hlau rau Q345 hlau, tab sis kev ntxhov siab tso cai yuav tsum tau txiav txim siab dua raws li pawg tuab hlau tshiab.
Qhov feem pua ntawm cov khoom tseem ceeb ntawm Q345 hlau yog qhov zoo ib yam li 16Mn hlau, qhov sib txawv yog tias ntxiv cov khoom sib xyaw ua ke ntawm V, Ti thiab Nb. Ib qho me me ntawm V, Ti, thiab Nb alloying elements tuaj yeem ua kom cov nplej zoo dua, txhim kho qhov tawv ntawm cov hlau, thiab txhim kho cov khoom siv kho tshuab ntawm cov hlau. Nws kuj yog vim li no uas qhov tuab ntawm cov hlau phaj tuaj yeem ua kom loj dua. Yog li ntawd, cov khoom siv kho tshuab ntawm Q345 hlau yuav tsum zoo dua li 16Mn hlau, tshwj xeeb tshaj yog nws qhov kev ua haujlwm kub qis tsis muaj nyob rau hauv 16Mn hlau. Qhov kev ntxhov siab tso cai ntawm Q345 hlau yog siab dua me ntsis ntawm 16Mn hlau.
kev sib piv kev ua tau zoo
Q345Dcov yeeb nkab tsis muaj qhov txuascov khoom siv kho tshuab:
Lub zog tensile: 490-675 Lub zog tawm los: ≥345 Kev ntev: ≥22
Q345Bcov yeeb nkab tsis muaj qhov txuascov khoom siv kho tshuab:
Lub zog tensile: 490-675 Lub zog tawm los: ≥345 Kev ntev: ≥21
Cov khoom siv kho tshuab ntawm Q345A seamless yeeb nkab:
Lub zog tensile: 490-675 Lub zog tawm los: ≥345 Kev ntev: ≥21
Cov khoom siv kho tshuab ntawm Q345C seamless yeeb nkab:
Lub zog tensile: 490-675 Lub zog tawm los: ≥345 Kev ntev: ≥22
Cov khoom siv kho tshuab ntawm Q345E seamless yeeb nkab:
Lub zog tensile: 490-675 Lub zog tawm los: ≥345 Kev ntev: ≥22
Cov Khoom Series
Q345D hlau piv rau Q345A, B, C hlau. Qhov kub sim ntawm qhov kub qis cuam tshuam zog yog qis. Kev ua tau zoo. Tus nqi ntawm cov tshuaj lom neeg P thiab S qis dua li Q345A, B thiab C. Tus nqi lag luam siab dua Q345A, B, C.
Kev txhais ntawm Q345D:
① Muaj Q + tus lej + cim qib zoo + cim txoj kev deoxidation. Nws tus lej hlau yog ua ntej los ntawm "Q", uas sawv cev rau qhov yield point ntawm cov hlau, thiab tus lej tom qab nws sawv cev rau tus nqi ntawm yield point hauv MPa. Piv txwv li, Q235 sawv cev rau cov hlau carbon nrog qhov yield point (σs) ntawm 235 MPa.
②Yog tias tsim nyog, lub cim qhia qib zoo thiab txoj kev deoxidation tuaj yeem cim tom qab tus lej hlau. Cov cim qib zoo yog A, B, C, D feem. Lub cim txoj kev deoxidation: F txhais tau tias hlau npau; b txhais tau tias hlau tua ib nrab; Z txhais tau tias hlau tua; TZ txhais tau tias hlau tua tshwj xeeb, thiab cov hlau tua tsis tuaj yeem cim nrog cov cim, uas yog, ob qho tib si Z thiab TZ tuaj yeem tshem tawm. Piv txwv li, Q235-AF txhais tau tias Qib A hlau npau.
③ Cov hlau carbon rau cov hom phiaj tshwj xeeb, xws li hlau choj, hlau marine, thiab lwm yam, feem ntau siv txoj kev qhia tawm ntawm cov hlau carbon, tab sis tsab ntawv qhia txog lub hom phiaj tau ntxiv rau thaum kawg ntawm tus lej hlau.
Kev taw qhia txog cov khoom siv
| lub ntsiab lus | C≤ | Mn | Si≤ | P≤ | S≤ | Al≥ | V | Nb | Ti |
| cov ntsiab lus | 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 |
Cov khoom siv kho tshuab ntawm Q345C yog raws li nram no (%):
| Cov khoom siv kho tshuab ntsuas | Kev ntev (%) | Kub ntsuas 0 ℃ | Lub zog tensile MPa | Cov ntsiab lus tawm MPa≥ |
| tus nqi | δ5≥22 | J≥34 | σb (470-650) | s (324-259) ib. |
Thaum lub phab ntsa tuab ntawm 16-35 hli, σs≥325Mpa; thaum lub phab ntsa tuab ntawm 35-50 hli, σs≥295Mpa
2. Cov yam ntxwv ntawm kev vuam ntawm Q345 hlau
2.1 Kev suav ntawm cov pa roj carbon sib npaug (Ceq)
Ceq=C+Mn/6+Ni/15+Cu/15+Cr/5+Mo/5+V/5
Xam Ceq = 0.49%, ntau dua 0.45%, nws tuaj yeem pom tias qhov kev ua haujlwm vuam ntawm Q345 hlau tsis zoo heev, thiab cov kev ntsuas thev naus laus zis nruj yuav tsum tau tsim thaum lub sijhawm vuam.
2.2 Teeb meem uas yuav tshwm sim hauv Q345 hlau thaum lub sijhawm vuam
2.2.1 Kev ua kom tawv hauv thaj chaw uas raug cua sov kub
Thaum lub sijhawm vuam thiab txias ntawm Q345 hlau, cov qauv quenched-martensite yooj yim tsim nyob rau hauv thaj chaw cuam tshuam los ntawm cua sov, uas ua rau qhov nyuaj thiab txo qhov plasticity ntawm thaj chaw ze-seam. Qhov tshwm sim yog tawg tom qab vuam.
2.2.2 Kev rhiab heev ntawm qhov tawg txias
Cov kab nrib pleb ntawm Q345 hlau feem ntau yog cov kab nrib pleb txias.
Lub sijhawm tshaj tawm: Lub Peb Hlis-20-2023