S235J2W Corten Steel, raws li huab cua- qib tiv taus raws li European tus qauv EN 10025-5, yog qhov txawv los ntawm nws "J2" qis-kub toughness (-}20℃cuam tshuam yuav tsum tau) thiab "W" huab cua tsis kam-ob qho tib si yog txiav txim ncaj qha los ntawm nws cov tshuaj muaj pes tsawg leeg. Kev nkag siab txog cov kev xav tau ntawm cov txheej txheem no yog qhov tseem ceeb rau kev ua kom cov khoom ua raws, kev nyab xeeb ntawm cov qauv, thiab kev tiv thaiv corrosion mus ntev hauv kev yuav khoom thiab kev siv. Dab tsi yog qhov tseem ceeb tshuaj muaj pes tsawg leeg txwv rau S235J2W, thiab vim li cas lawv tseem ceeb? Hauv qab no yog ib qho yooj yim, kev txiav txim siab tawg.
1. Cov ntsiab lus tseem ceeb ntawm cov tshuaj lom neeg (EN 10025-5 Standard txwv)
EN 10025-5 teeb tsa kev txwv nruj rau S235J2W cov khoom siv tshuaj lom neeg, nrog rau kev tsom mus rau qhov ntsuas huab cua tiv thaiv, qhov kub tsis tshua muaj zog, thiab kev ua tiav. Cov ntsiab lus tseem ceeb (feem ntau, max / min) yog raws li hauv qab no:
Cov pa roj carbon (C): Tsawg dua lossis sib npaug li 0.18%. Cov ntsiab lus qis carbon yog qhov tseem ceeb rau kev tswj xyuas cov hlau zoo heev uas tsis tshua muaj siab - qhov kub thiab txias (qhov tseem ceeb ntawm "J2" cov lus xaus) thiab weldability - tseem ceeb rau ntawm - qhov chaw tsim khoom ntawm cov khoom siv.
Manganese (Mn): Tsawg dua lossis sib npaug li 1.60%. Txhim kho cov hlau lub zog thiab ductility yam tsis muaj kev cuam tshuam nws qhov toughness, ua kom muaj kev sib npaug ntawm kev ua haujlwm thiab kev tsim kho.
Silicon (Si): Tsawg dua lossis sib npaug li 0.70%. Ua raws li deoxidizer thaum lub sijhawm tsim khoom thiab ua rau muaj kev ruaj ntseg ntawm cov txheej txheem tiv thaiv xeb, txhawb nqa ntev - lub sij hawm atmospheric corrosion kuj.
Phosphorus (P): 0.070-0.120%. A foundational weather-resistant element-promotes the formation of a dense, adherent -FeOOH rust layer that blocks moisture and corrosive media penetration.
Sulfur (S): Tsawg dua lossis sib npaug li 0.035%. Kev tswj nruj nruj kom tsis txhob muaj qhov tsis xws luag sab hauv (piv txwv li, suav nrog) uas yuav ua rau lub zog tsis muaj zog thiab corrosion kuj, tshwj xeeb tshaj yog qhov tseem ceeb rau kev ua haujlwm kub tsawg -.
Copper (Cu): Ntau dua lossis sib npaug li 0.20%. Cov huab cua tseem ceeb -cov khoom tiv taus- ua haujlwm sib koom ua ke nrog phosphorus kom ruaj khov txheej txheej xeb, txhim kho atmospheric corrosion kuj piv rau cov pa roj carbon zoo tib yam.
Chromium (Cr): 0.30-1.20%. Txhim kho qhov compactness thiab durability ntawm cov xeb txheej, ua rau nws tiv taus ntau qhov chaw hnyav xws li ntug dej hiav txwv ntsev los yog muaj SO₂ muaj kuab paug.
Nickel (Ni): Tsawg dua lossis sib npaug li 0.65%. Ib qho kev xaiv uas ntxiv txhim kho qis- qhov kub thiab txias (-20℃cuam tshuam lub zog Ntau dua lossis sib npaug rau 27J) thaum ntxiv, ua rau S235J2W haum rau cov ntawv thov hauv cheeb tsam txias.
2. Critical Synergy: Chemical Composition & Key Properties
Cov tshuaj muaj pes tsawg leeg ntawm S235J2W yog haum rau nws cov khoom siv dual core - huab cua tsis kam thiab qis - kub toughness:
Huab cua Resistance Synergy: Cu, Cr, thiab P ua hauj lwm ua ke los tsim cov txheej txheem tiv thaiv xeb ruaj khov. Tsis zoo li xoob xeb ntawm cov hlau zoo tib yam, txheej txheej no ua kom nruj rau lub substrate, ua raws li lub ntuj thaiv kev tiv thaiv corrosion. Cov kev txwv nruj ntawm cov ntsiab lus no kom ntseeg tau tias muaj cov kab xeb zoo sib xws hauv cov khoom siv.
Tsawg-Tsub Toughness Guarantee: Tsawg C thiab tswj S cov ntsiab lus tiv thaiv nkig theem tsim nyob rau hauv cov hlau matrix, thaum xaiv Ni txhim kho toughness ntawm -20℃. Qhov no ua kom S235J2W zam kev tawg tawg hauv qhov chaw txias, qhov txiaj ntsig tseem ceeb tshaj qis "J" qib huab cua-resistant steels (xws li, S235J0W).
3. Cov lus qhia txog kev yuav khoom & kev pov thawj
Kev Tshawb Fawb Kev Ua Raws Cai: Thaum muab S235J2W, thov EN 10204 Hom 3.1 Mill Test Reports (MTRs) los ntawm cov neeg muag khoom. Xyuas kom MTR kom meej meej sau tag nrho cov tshuaj muaj pes tsawg leeg muaj nuj nqis, lees paub ua raws li EN 10025-5, thiab suav nrog cov lej ntsuas kub thiab cov ntawv zeb.
Ib puag ncig-Txoj Kev Xaiv Hloov: Rau cov ntug dej hiav txwv txias lossis siab siab - thaj chaw muaj kev ua qias tuaj, paub meej tias cov khoom siv S235J2W muaj Cu thiab Cr cov ntsiab lus nyob rau sab sauv kawg ntawm cov qauv, thiab xyuas seb Ni puas tau ntxiv los txhim kho qis - qhov kub thiab txias.
Qib tsis meej pem kev zam: Tsis txhob yuam kev S235J2W nrog tsis yog- huab cua- qib tiv taus (piv txwv li, S235JR) lossis qis qis dua- kub toughness variants (piv txwv li, S235J0W). Ib txwm txheeb xyuas qhov "J2" (tsawg-kub) thiab "W" (huab cua tsis kam) ua raws, thiab EN 10025-5 ua raws li cov ntaub ntawv yuav khoom.
Hauv cov ntsiab lus, S235J2W Corten Steel cov kev cai tseem ceeb tshuaj nyob rau hauv EN 10025-5 nruab nrab ntawm Cu, Cr, thiab P rau huab cua tsis kam, thiab qis C / S rau qis - kub toughness. Kev txheeb xyuas cov kev txwv tsis pub muaj los ntawm MTRs ua kom cov khoom ua tau raws li qhov xav tau ntawm kev tiv thaiv corrosion thiab kev pabcuam hauv cheeb tsam txias, tso lub hauv paus ruaj khov rau kev nyab xeeb ntawm cov qauv.
