Q345 yog cov khoom siv hlau.Nws yog cov hlau tsis tshua muaj hlau (C<0.2%), dav siv hauv kev tsim kho, txuas hniav, tsheb, nkoj, nkoj siab, thiab lwm yam. Q yog sawv cev rau lub zog ntawm cov khoom siv no, thiab cov nram qab no 345 yog hais txog cov txiaj ntsig ntawm qhov no. khoom, uas yog hais txog 345 MPa.Thiab tus nqi tawm los yuav txo nrog qhov nce ntawm cov khoom thickness.
Q345 muaj cov cuab yeej zoo txhua yam, qhov ua tau zoo ntawm qhov kub thiab txias, zoo plasticity thiab weldability, thiab yog siv los ua cov qauv, cov khoom siv kho tshuab, cov khoom siv hauv tsev, cov khoom siv hlau dav dav, kub dov los yog normalized, tuaj yeem siv ntau yam qauv hauv cheeb tsam txias hauv qab no. -40 ° C.
Kev faib tawm
Q345 tuaj yeem muab faib ua Q345A,q345 ib, Q345C, Q345D, Q345E raws li qib.Qhov lawv sawv cev yog qhov kub ntawm qhov kev poob siab.
Q345A qib, tsis muaj kev cuam tshuam;
Q345B qib, 20 degrees qhov kub thiab txias cuam tshuam;
Q345C qib, yog 0 degree cuam tshuam;
Q345D qib, yog -20 degree cuam tshuam;
Q345E theem, yog -40 degree cuam tshuam.
Ntawm qhov sib txawv ntawm kev poob siab, qhov ntsuas qhov poob siab kuj txawv.
tshuaj 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；
vs 16 mn
Q345 steel yog hloov pauv rau cov khoom qub ntawm 12MnV, 14MnNb, 18Nb, 16MnRE, 16Mn thiab lwm yam hlau, tsis yog hloov rau 16Mn steel.Hais txog cov tshuaj muaj pes tsawg leeg, 16Mn thiab Q345 kuj txawv.Qhov tseem ceeb tshaj, muaj qhov sib txawv loj ntawm pawg tuab tuab ntawm ob lub steels raws li qhov sib txawv ntawm cov khoom siv zog, thiab qhov no yuav ua rau muaj kev hloov pauv ntawm cov ntaub ntawv tso cai rau cov thicknesses.Yog li ntawd, nws tsis tsim nyog tsuas yog siv cov kev ntxhov siab tso cai ntawm 16Mn steel rau Q345 steel, tab sis qhov kev ntxhov siab tso cai yuav tsum tau rov txiav txim siab raws li qhov tshiab steel thickness pawg loj.
Qhov kev faib ua feem ntawm cov ntsiab lus tseem ceeb ntawm Q345 steel yog qhov tseem ceeb tib yam li ntawm 16Mn steel, qhov sib txawv yog qhov sib txawv ntawm cov ntsiab lus ntawm V, Ti thiab Nb ntxiv.Ib qho me me ntawm V, Ti, thiab Nb alloying cov ntsiab lus tuaj yeem kho cov nplej, txhim kho lub zog ntawm cov hlau, thiab txhim kho cov cuab yeej zoo ntawm cov hlau.Nws kuj yog vim qhov no tias lub thickness ntawm steel phaj tuaj yeem ua kom loj dua.Yog li ntawd, cov khoom siv kho tshuab dav dav ntawm Q345 steel yuav tsum zoo dua li 16Mn steel, tshwj xeeb tshaj yog nws qhov kub thiab txias tsis muaj nyob hauv 16Mn steel.Qhov kev cia siab ntawm Q345 steel yog me ntsis siab dua li ntawm 16Mn steel.
kev sib piv
qw 345dseamless yeeb nkabmechanical zog:
Tensile zog: 490-675 Yield zog: ≥345 Elongation: ≥22
q345 ibseamless yeeb nkabmechanical zog:
Tensile zog: 490-675 Yield zog: ≥345 Elongation: ≥21
Q345A seamless yeeb nkab txhua yam khoom:
Tensile zog: 490-675 Yield zog: ≥345 Elongation: ≥21
Q345C seamless yeeb nkab txhua yam khoom:
Tensile zog: 490-675 Yield zog: ≥345 Elongation: ≥22
Q345E seamless yeeb nkab txhua yam khoom:
Tensile zog: 490-675 Yield zog: ≥345 Elongation: ≥22
Khoom Series
Q345D steel piv nrog Q345A, B, C steel.Qhov ntsuas kub ntawm qhov ntsuas kub ntawm qhov cuam tshuam lub zog yog qhov tsawg.Kev ua tau zoo.Tus nqi ntawm cov tshuaj phem P thiab S yog qis dua Q345A, B thiab C. Cov nqi lag luam siab dua Q345A, B, C.
Lub ntsiab lus ntawm Q345D:
① Tsim los ntawm Q + tus lej + cov cim qib zoo + cov cim deoxidation.Nws tus lej steel yog ua ntej los ntawm "Q", uas sawv cev rau qhov taw tes tawm ntawm cov hlau, thiab tus lej tom qab nws sawv cev rau tus nqi ntawm qhov taw tes tawm hauv MPa.Piv txwv li, Q235 sawv cev rau carbon structural steel nrog rau qhov taw tes tawm (σs) ntawm 235 MPa.
② Yog tias tsim nyog, lub cim qhia txog qib zoo thiab deoxidation txoj kev tuaj yeem raug cim tom qab tus lej hlau.Cov cim qib zoo yog A, B, C, D raws.Deoxidation txoj kev cim: F txhais tau tias boiling hlau;b txhais tau tias semi-tua steel;Z txhais tau tias tua hlau;TZ txhais tau tias tshwj xeeb tua hlau, thiab cov hlau tua tsis tuaj yeem raug cim nrog cov cim, uas yog, Z thiab TZ tuaj yeem raug tshem tawm.Piv txwv li, Q235-AF txhais tau tias Qib A boiling hlau.
③ Cov pa roj carbon steel rau lub hom phiaj tshwj xeeb, xws li choj hlau, marine steel, thiab lwm yam, yeej siv txoj kev qhia ntawm carbon structural steel, tab sis tsab ntawv qhia lub hom phiaj yog ntxiv rau qhov kawg ntawm tus lej hlau.
Cov ntaub ntawv qhia
| keeb | C≤ | Mn | Si ≤ | P≤ | S≤ | Al≥ | V | Nb | Ti |
| cov ntsiab lus | 0.2 | 1.0-1.6 | 0.55 ib | 0.035 ib | 0.035 ib | 0.015 ib | 0.02-0.15 dr hab | 0.015-0.06 Nws | 0.02-0.2 hli |
Cov yam ntxwv ntawm Q345C yog raws li nram no (%):
| Mechanical Properties Index | Elongation (%) | Kev ntsuas kub 0 ℃ | Tensile zog MPa | Yield point MPa≥ |
| tus nqi | Txd5 ≥ 22 | J≥34 | IB (470-650) | s (324-259) ib. |
Thaum cov phab ntsa thickness nyob nruab nrab ntawm 16-35mm, σs≥325Mpa;Thaum cov phab ntsa thickness nyob nruab nrab ntawm 35-50mm, σs≥295Mpa
2. Vuam yam ntxwv ntawm Q345 steel
2.1 Kev suav ntawm 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 steel tsis zoo heev, thiab kev ntsuas kev siv tshuab nruj yuav tsum tau tsim thaum lub sij hawm vuam.
2.2 Cov teeb meem tshwm sim hauv Q345 steel thaum vuam
2.2.1 Hardening nyiam nyob rau hauv tshav kub-cuam tshuam cheeb tsam
Thaum lub sij hawm vuam thiab txias txheej txheem ntawm Q345 steel, quenched qauv-martensite yog yooj yim tsim nyob rau hauv lub tshav kub-cuam tshuam cheeb tsam, uas ua rau kom lub hardness thiab txo cov plasticity ntawm ze-seam cheeb tsam.Qhov tshwm sim yog tawg tom qab vuam.
2.2.2 Txias tawg rhiab heev
Cov kab nrib pleb ntawm Q345 steel feem ntau yog cov kab nrib pleb txias.
Post lub sij hawm: Mar-20-2023