Dab tsi yog Cov Cai Txhais Lus
Ob qib zaum hauv EN 10025-2, tus qauv rau cov khoom kub dov ntawm cov qauv hlau hauv cov khoom tsis zoo thiab cov khoom siv tshwj xeeb steel. Qhov kev xaiv yog tsim los ntawm lub cim S rau cov qauv hlau, qhov tsawg kawg nkaus yield zog nyob rau hauv MPa rau lub thinnest thickness ntau yam, thiab cov ntaub ntawv zoo. S235JR yog li ntawd txhais tau hais tias cov qauv steel nrog qhov tsawg kawg nkaus lub zog ntawm 235 MPa, thiab S355JR cov qauv steel nrog qhov tsawg kawg nkaus tawm lub zog ntawm 355 MPa; nyob rau hauv ob qho tib si JR qhia txog Charpy cuam tshuam lub zog ntawm yam tsawg 27 J ntawm 20 degrees C.
Ib lub ntsiab lus tsim nyog kho vim tias nws tshwm sim ntau zaus hauv kev sib piv: S355JR yog ib qho tsis yog - alloy structural steel, tsis yog huab cua hlau. Cov qib huab cua nqa W hauv qhov kev xaiv, xws li S355J0W lossis S355J2W raws li cov qauv huab cua sib cais, thiab lawv ua tiav lawv cov kev tiv thaiv corrosion los ntawm me me ntxiv ntawm tooj liab, chromium thiab lwm yam khoom. S355JR tsis muaj xws li alloy ntxiv thiab yuav tsum tsis txhob xaiv rau atmospheric corrosion kuj.
Mechanical Properties muab piv
| Khoom | S235 JR | S355 JR |
|---|---|---|
| Yam tsawg kawg nkaus yield zog, thickness 16 hli thiab qis dua | 235 MPa rau | 355 MPa rau |
| Yam tsawg kawg nkaus yield zog, tshaj 16 hli mus rau 40 hli | 225 MPa | 345 MPa rau |
| Yam tsawg kawg nkaus yield zog, tshaj 40 hli mus rau 63 hli | 215 MPa | 335 MPa rau |
| Tensile zog ntau yam | 360 txog 510 MPa | 470 txog 630 MPa |
| Charpy cuam tshuam lub zog, JR zoo | 27 J yam tsawg kawg nkaus ntawm 20 ° C | 27 J yam tsawg kawg nkaus ntawm 20 ° C |
Nyeem cov lus saum toj saud: lub zog tawm los tsis yog ib tus lej rau ob qib. Nws ntog raws li cov khoom thickness nce, uas qhia txog qhov qis qis qis thiab coarser microstructure ntawm qhov hnyav dua, thiab cov qauv kuaj xyuas yuav tsum siv tus nqi rau qhov tseeb thickness siv.
Chemistry thiab Weldability Considerations
Ob qib yog cov hlau tsis tshua muaj cov hlau tsis muaj manganese thiab txwv phosphorus thiab sulfur cov ntsiab lus, thiab ob qho tib si tau yooj yim weldable los ntawm cov txheej txheem arc. Dab tsi txawv yog qib carbon thiab manganese xav tau kom ncav cuag lub zog siab dua ntawm S355JR thiab, yog li ntawd, cov nqi sib npaug carbon. Cov pa roj carbon ntau dua txhais tau tias muaj kev saib xyuas ntau dua nrog cov khoom siv hluav taws xob, preheat thiab hydrogen tswj, tshwj xeeb tshaj yog nyob rau hauv cov ntu tuab thiab hauv qhov kub thiab txias. Cov txheej txheem vuam tsim nyog thiab cov lus pom zoo vuam ntawm EN 1011-2 yuav tsum tau ua raws rau ob qib, thiab qib kev txwv ntawm kev sib koom ua ke tseem ceeb npaum li cov hlau nws tus kheej ntawm cov ntu hnyav.
Xaiv Ntawm Lawv
Qhov kev txiav txim siab yog qhov hnyav tiv thaiv tus nqi sib piv. S235JR yog lub zog qis dua thiab feem ntau cov nqi qis dua, thiab nws yog lub neej ntawd rau kev ua haujlwm dav dav - cov tsev, thav duab, brackets, machinery bases thiab dav fabrication - qhov twg 235 MPa ntawm yield zog txaus. S355JR tso cai rau tus tsim kom txo qis seem me me rau tib lub thauj khoom, uas txuag qhov hnyav, txo qhov ntim vuam thiab tuaj yeem cuam tshuam rau cov qauv ntev ntev, cov khoom siv crane, cov khoom thauj thiab cov kab uas nqa cov axial siab. Tus nqi them ib tonne rau S355JR yuav tsum tau offset tiv thaiv qhov hnyav tau txais kev cawmdim; ntawm cov qauv kev nyuab siab me ntsis tsis muaj dab tsi los cawm, thiab ntawm cov kev ntxhov siab heev, kev txuag feem ntau yog qhov tseeb.
Ob daim ntawv qhia. Ua ntej, paub meej txog cov khoom lag luam raws li qib: kub tiav hollow seem yog tsim los rau EN 10210-1 thiab txias tsim hollow seem rau EN 10219-1, thiab txhua tus muaj nws tus kheej qhov ntev thiab kam rau ua, yog li qhov hollow seem txiav txim yuav tsum hais qib nrog cov khoom tsim nyog. Qhov thib ob, yog tias cov qauv raug rau cov huab cua tsis muaj kev tiv thaiv hnyav, lossis rau ib puag ncig marine lossis kev lag luam, tsis muaj cov qib no yog cov lus teb zoo thiab cov huab cua lossis cov tshuaj coated yuav tsum tau txiav txim siab hloov.
Kev tshuaj xyuas thiab cov ntaub ntawv
Ob qib yog muab los ntawm ib daim ntawv tshuaj ntsuam xyuas zeb uas qhia txog kev ntsuas cua sov, cov txiaj ntsig tensile thiab cov txiaj ntsig kev xeem rau JR zoo. Rau cov qauv kev ua haujlwm, daim ntawv pov thawj feem ntau raug kuaj xyuas cov qib thiab cov tuab tuab, vim tias lub zog muaj nuj nqis hauv daim ntawv pov thawj yuav tsum sib haum rau cov tuab ntawm cov khoom xa tuaj. Cov xwm txheej saum npoo thiab qhov ntev ntev yog them los ntawm cov qauv khoom thiab los ntawm cov txheej txheem saum npoo rau cov khoom kub dov, thiab txhua yam kev kho los ntawm vuam ntawm qhov chaw tsis xws luag yog tswj los ntawm cov khoom txheem.
Cov lus nug nquag
Q:Puas yog S355JR muaj zog dua S235JR?
A: Yog. S355JR muaj qhov tsawg kawg nkaus lub zog ntawm 355 MPa tiv thaiv 235 MPa rau S235JR ntawm lub thickness ntawm 16 hli thiab qis dua, yog li lub zog piv yog kwv yees li 1.5 rau 1.
Q:Puas yog S355JR yog huab cua hlau?
A: Tsis yog. S355JR yog ib qho tsis yog- alloy structural steel raws li EN 10025-2. Cov qib huab cua nqa W hauv qhov kev xaiv thiab qhov sib ntxiv me me, thiab lawv tau them los ntawm tus qauv cais.
Q:JR lub ntsiab lus txhais li cas?
A: Nws txhais cov kev cuam tshuam toughness: qhov tsawg kawg nkaus Charpy cuam tshuam lub zog ntawm 27 J kuaj ntawm 20 degrees C. Nws yog tib yam yuav tsum tau ua hauv S235JR thiab S355JR.
Q:Qib twg yooj yim dua rau vuam?
A: S235JR muaj qhov sib npaug qis dua thiab yog qhov kev zam txim ntau dua ntawm ob, tshwj xeeb tshaj yog nyob rau hauv cov ntu tuab thiab hauv huab cua txias. Ob leeg tuaj yeem txuas tau zoo thaum cov txheej txheem ua raws EN 1011-2.
Q:S235JR thiab S355JR puas tuaj yeem siv ua ke hauv ib qho qauv?
A: Yog, lawv niaj hnub welded rau ib leeg, muab cov txheej txheem vuam tsim nyog rau kev sib xyaw ua ke, rau cov thicknesses koom nrog thiab rau lub zog siab dua ntawm ob. Tus tsim yuav tsum siv lub zog ntawm qib qis uas ib tug tswv cuab raug tswj hwm los ntawm cov khoom siv ntawd.