Cov lus teb yuav tsum muaj kev qhia meej tseem ceeb, xws li "Material GradeS420"yog ibnpe tsis tiavthiab coj ncaj qha mus rau qhov tsis meej pem peb nyuam qhuav tham. Nws yogtseem ceeb kom paub cov lus tag(N, M, NL, ML, thiab lwm yam) thiabntsiab lustxhawm rau txheeb xyuas cov khoom raug.
Ntawm no yog qhov tseeb kev tawg ntawm "Material Grade S420" txhais tau li cas:
1. Kev Siv tsis tiav (Kev siv tsis raug)
Hauv kev xyaum, "S420" feem ntau yog siv los ua shorthand hauv kev tsim kho thiab fabrication. Txawm li cas los xij, raws li cov qauv kev cai,"S420" los ntawm nws tus kheej tsis yog qib siv tau.
Thaum koj pom "S420" tsis raug cai, nws yuav luag ib txwm hais txog cov tsev neeg steel qauv (EN 10025), thiab feem ntau txhais tau tias:
S420N(Normalized)
S420M(Thermomechanically dov)
2. S420 raws li Cov Qauv Hlau (EN 10025) - Lub ntsiab lus feem ntau
Yog hais tias lub ntsiab lus yog kev tsim kho, txuas hniav, tshuab hnyav, lossis engineering, "S420" yog hais txog tsev neeg ntawm siab- zog, qis- alloy structural steels.
| Qib | Txuj | Qhov xwm txheej | Cov khoom tseem ceeb | Impact Test | Kev siv loj |
|---|---|---|---|---|---|
| S420N | TS EN 10025-3 | Li qub | Siab zog + zoo toughness | -20℃/ 40J | Cov txheej txheem tseem ceeb welded hauv cov huab cua txias |
| S420M | TS EN 10025-4 | Thermomech. Rolled | Lub zog siab, tsis muaj kev kho cua sov | -20℃/ 40J | Zoo ib yam li S420N, feem ntau raug nqi ntau dua - zoo |
| S420 NL | TS EN 10025-3/4 | Norm./Thermo. | Siab zog +low -temp toughness | -50℃/ 27J | Arctic / offshore structures |
| S420ML | TS EN 10025-4 | Thermomech. Rolled | Siab zog +low -temp toughness | -50℃/ 27J | Arctic / offshore structures |
Cov yam ntxwv ntawm S420 Structural Steels:
Yam tsawg kawg nkaus Yield Strength:420 MPa (rau thickness Tsawg dua los yog sib npaug rau 16mm). Qhov no yog lawv lub ntsiab feature.
Kev sib xyaw:Carbon-Manganese steel nrog micro- alloys (Niobium, Vanadium).
Corrosion Resistance: Tsis muaj.Lawv tsis yog stainless thiab xav tau cov txheej txheem tiv thaiv.
Daim ntawv thov:Siv qhov twg muaj zog ntau dua S355 yuav tsum tau txo qhov hnyav los yog nce lub peev xwm thauj khoom (xws li, siab- nce tsev, ntev- txuas txuas, crane booms, cua turbine yees).
3. S420 li "Stainless Steel" - Ib qho kev txhais lus tsis zoo
Vim muaj cov lej sib tsoo, "S420" qee zaum yuam kev cuam tshuam nrog AISI / SAE 420 stainless hlau. Qhov no tsis yog nyob rau hauv ib txoj kev xav.
Lub npe raug rau stainless hlau yog "420" lossis "AISI 420" (lossis EN 1.4021).
Cov thawj "S" nyob rau hauv European structural steel qib tshwj xeeb txhais tau tias "Structural", tsis yog "Stainless".
Stainless hlau 420 yog qib martensitic nrog ~ 12-14% Chromium, siv rau riam hniav, cov cuab yeej phais, thiab cov kabmob. Nws lub zog tawm los yog qis dua, thiab nws cov cuab yeej tseem ceeb yog hardness thiab nruab nrab corrosion kuj.
Tsob Ntoo Txiav Txim: Txheeb xyuas "Cov Khoom Siv Qib S420"
Summary & Key Takeaway
"S420" yog ib qho tsis tiav.
Nyob rau hauv 95% ntawm cov neeg mob (tshwj xeeb tshaj yog nyob rau hauv structural engineering), nws yog hais txog lub siab - lub zog structural steel ib EN 10025, nrog ib tug tsawg kawg nkaus yield zog ntawm 420 MPa.
Nws tsis yog stainless hlau. Yog tias koj xav tau kev tiv thaiv corrosion, koj yuav tsum qhia cov txheej txheem tiv thaiv lossis cov khoom sib txawv (xws li, stainless hlau qib 1.4401/316 lossis duplex stainless hlau).
Kom tsis txhob raug nqi kim:Ntawm kev kos duab thiab kev yuav khoom, tsis txhob sau tsuas yog "S420". Ib txwm siv qhov ua tiav, tsim qauv tsim.
Kab hauv qab: "Material Grade S420" yog ib tsev neeg ntawm siab -lub zog, weldable, fine-grain structural steels siv rau xav tau kev tsim kho tej yaam num. Cov khoom muaj tseeb nyob ntawm cov lus uas yuav tsum ua raws li nws (N, M, NL, lossis ML).