Tshuaj muaj pes tsawg leeg thiab txhua yam khoom ntawm S235J2
Ntawm no yog cov ncauj lus kom ntxaws txog cov tshuaj lom neeg muaj pes tsawg leeg thiab cov khoom siv kho tshuab ntawm cov qauv steel qibS235J2,Raws li European tus qauv EN 10025-2: 2004.
S235J2 yog ib qho uas tsis yog- alloy, carbon structural steel feem ntau siv hauv kev tsim kho thiab kev tsim vaj tsev. Qhov kev xaiv "J2" qhia tau hais tias nws muaj kev cuam tshuam qhov hnyav (Charpy V-notch) ntawm -20 degree, ua rau nws tsim nyog rau kev siv hauv qhov chaw txias.
1. Chemical Composition (los ntawm qhov hnyav %)
Cov txheej txheem yog qhov tseem ceeb rau cov hlau weldability, toughness, thiab lub zog. Qhov siab tshaj plaws tau teev tseg.
| Element | Ntau tshaj % | Lub Hom Phiaj/Cov nyhuv |
|---|---|---|
| Cov pa roj carbon (C) | 0.17% max | Primary hardening element. Tsawg carbon ua kom zoo weldability thiab formability. |
| Manganese (Mn) | 1.40% max | Ua kom muaj zog thiab hardenability, txhim kho kub - ua haujlwm. |
| Phosphorus (P) | 0.035% max | impurity. Ua phem; txo ductility thiab toughness (ua rau embrittlement). |
| Sulfur (S) | 0.035% max | impurity. Ua phem; txo ductility thiab ua rau kub shortness thaum vuam. |
| Silicon (Si) | Tsawg dua lossis sib npaug li 0.35%(tus qauv) | Deoxidizing tus neeg sawv cev ("tua hlau"). Pab txhawb zog. |
| Nitrogen (N) | 0.012% max | tuaj yeem txo ductility yog tias tsis tswj; txwv nyob rau hauv J2 qib rau toughness. |
Cov ntsiab lus tseem ceeb ntawm Composition:
Nws yog "me me hlau" nrog cov ntsiab lus qis carbon.
Carbon Equivalent (CEV) rau weldability yog tsawg, feem ntau nyob ib ncig ntawm 0.28-0.35%, xam raws li:
CEV=C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
Tus nqi qis no txhais tau hais tias nws zoo heev rau vuam yam tsis muaj ua ntej - lossis tshaj tawm - cua sov nyob rau hauv ib txwm muaj.
J2 qib yog tag nrho "tua" (deoxidized), txhais tau tias nws muaj ntau yam sib xws thiab qauv dua li cov hlau rimmed.
2. Mechanical Properties
Cov cuab yeej tau teev tseg rau cov khoom siv mus txog16 mmnyob rau hauv thickness (qhov feem ntau siv ntau yam). Cov khoom txo qis me ntsis nrog nce thickness.
| Khoom | Tus nqi (rau thickness Tsawg dua los yog sib npaug rau 16mm) | Nqe lus piav qhia / Test Standard |
|---|---|---|
| Yield zog (ReH) | Ntau dua lossis sib npaug li 235 MPa | Qhov kev ntxhov siab uas cov khoom pib deform plastically. Qhov no yog "235" nyob rau hauv lub npe. |
| Tensile zog (Rm) | 360 - 510 MPa | Qhov siab tshaj plaws ntawm cov khoom siv tuaj yeem tiv taus thaum raug ncab. |
| Elongation ntawm Break (A₅) | Ntau dua lossis sib npaug li 26%(min) | Kev ntsuas ductility (% elongation ntawm qhov ntsuas qhov ntev ntawm 5.65√S₀). |
| Impact Toughness (KV) | Ntau dua lossis sib npaug li 27 J ntawm -20 degree | Charpy V-cov ntawv xeem. Qib "J2" lav qhov tsawg kawg nkaus lub zog nqus ntawm -20 degree. |
Lub ntsiab lus tseem ceeb ntawm Thickness:
Mechanical zog yog thickness -dependent. Piv txwv li:
For thickness >16 hli mus rau 40 hli: Yield Strength txo mus rau ntau dua los yog sib npaug rau 225 MPa.
For thickness >40 mm txog 63 mm: Yield Strength txo kom ntau dua lossis sib npaug li 215 MPa.
3. Qib sib npaug
S235J2 yog ib feem ntawm European nomenclature. Nov yog nws qhov sib npaug ze tshaj plaws hauv lwm cov qauv:
Cov ntsiab lus ntawm cov yam ntxwv tseem ceeb
Lub zog: Nruab nrab tawm lub zog (235 MPa).
Toughness: Guaranteed zoo cuam tshuam rau -20 degree.
Weldability: Zoo heev, vim muaj cov ntsiab lus carbon tsawg thiab qis carbon sib npaug.
Machinability: Zoo.
Formability: zoo heev, vim siab ductility.
Nco ntsoov:Rau cov kev siv tseem ceeb, muaj feem xyuamTS EN 10025-2tus qauv lossis nws qhov kev lees paub hauv tebchaws (xws li BS EN 10025-2) yuav tsum yog txoj cai kawg, thiab cov ntaub ntawv pov thawj (cov ntawv zeb) yuav tsum raug txheeb xyuas.
Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.
