Dab tsi yog DIN 2391 npog
DIN 2391 yog German tus qauv rau seamless ncig steel raj rau precision daim ntaub ntawv, muab nyob rau hauv ob qhov chaw: Tshooj 1 npog qhov ntev thiab Tshooj 2 npog kev xa khoom. Nws txoj haujlwm yog txias-kos seamless raj hauv cov pa roj carbon thiab qis- alloy steel, nkag rau hauv qhov kaj, ze- mob siab rau kev siv tshuab, hydraulic thiab automotive. Hauv European kev coj ua tus qauv tau hloov pauv los ntawm EN 10305-1 rau seamless precision steel hlab thiab los ntawm cov khoom muaj feem xyuam ntawm cov koob uas npog welded precision raj thiab hydraulic kab, tab sis DIN 2391 tseem yog ib qho kev siv hauv kev yuav khoom thiab kos duab, thiab cov npe qib steel St 35, St 45 thiab St 56 23 EN 2391 tseem siv nyob rau hauv E2391. e355 ua.
Steel Qib thiab Chemistry
| Qib (DIN 2391) | EN 10305-1 Sib npaug | Hom Chemistry Limits |
|---|---|---|
| St 35 | E235 | C 0.17 max, Si 0.35 max, Mn 1.20 max, P 0.025 max, S 0.015 max |
| St 52 | E355 | C 0.22 max, Si 0.55 max, Mn 1.60 max, P 0.025 max, S 0.015 max |
Cov qib tsis yog - alloy structural steels xaiv rau lub zog tsawg kawg nkaus yield zog es tsis yog rau corrosion kuj los yog siab kub zog. Vim hais tias cov raj txias txias rau kev ua siab ntev, cov hlau yuav raug tua, kaw - cov khoom siv nrog cov tshuaj sulfur kom tsis txhob muaj cov hlua uas qhib thaum kos duab thiab ua kom lub ntsej muag tsis muaj laps thiab seams. Cov khoom seem raug txwv los ntawm tus kws tsim khoom steel los tiv thaiv weldability thiab ua kom cov lus teb rau kev kho cua sov zoo ib yam los ntawm ntau mus rau ntau.
Mechanical Properties thiab Delivery Condition
| Qib | Qhov xwm txheej | Yam tsawg kawg nkaus Yield Strength | Tensile Strength Range | Elongation |
|---|---|---|---|---|
| E235 | Normalized (+ N) | 235 MPa rau | 360 txog 520 MPa | 25% yam tsawg kawg nkaus |
| E355 | Normalized (+ N) | 355 MPa rau | 490 txog 630 MPa | 22% yam tsawg kawg nkaus |
Kev xa khoom yog ib feem ntawm kev xaiv thiab yuav tsum tau teev nyob rau ntawm qhov kev txiav txim. Cold drawn thiab hard (+C) raj muaj lub zog siab tshaj plaws thiab qis tshaj ductility; txias kos thiab mos (+ LC) yog ib nrab recrystallised; stress relieved (+SR) tshem tawm cov kev ntxhov siab uas seem tom qab tsim thaum khaws cia feem ntau ntawm qhov txias - ua hauj lwm lub zog; annealed (+ A) thiab normalized (+ N) muab lub zog qis tshaj plaws nrog qhov zoo tshaj plaws ductility thiab seem stability. Cov raj rau hydraulic thooj voos kheej kheej feem ntau txiav txim siab kom txo qis kev cuam tshuam tom qab machining, thaum cov raj uas yuav khoov lossis flared raug txiav kom annealed.
Dimensions, Tolerances thiab Test
Lub qhov ntev ntawm tus txheej txheem yog tsim nyob ib ncig ntawm sab nraud txoj kab uas hla nrog ib tug zoo tswj cov phab ntsa, siv kam rau ua cov chav kawm rau ob txoj kab uas hla thiab phab ntsa kom ib tug raj tuaj yeem sib phim rau cov nyiaj machining ntawm cov khoom. Kev ncaj ncees, qhov kawg squareness thiab kev huv hauv tsev tau teev tseg vim tias cov raj siv los ua hydraulic thooj voos kheej kheej lossis ua cov khoom siv ua haujlwm uas qhov eccentric bore yuav cuam tshuam rau qhov ua tiav. Qhov kev lees paub ib txwm muaj yog qhov kev ntsuas nruj, kev sib tw los yog khoov los kuaj xyuas ductility, thiab ib qho kev nthuav dav lossis flaring xeem rau cov raj uas npaj rau kev ua haujlwm. Kev ntsuam xyuas hydrostatic lossis kev ntsuas tam sim no yog siv rau cov raj rau kev pabcuam hydraulic, thiab daim ntawv pov thawj tshuaj xyuas cov khoom siv rau EN 10204, feem ntau yog daim ntawv pov thawj 3.1 rau siab- muaj cov ntawv thov.
Tej kev siv
Kev siv lub ntsiab yog nyob rau hauv tshuab thiab tsheb engineering: hydraulic lub tog raj kheej chim thiab piston rods, pneumatic lub tog raj kheej raj, shock absorber thiab damper hlab, tsav shafts, steering kab thiab roj los yog roj hloov kab. Vim hais tias lub bore yog du thiab ze rau kev zam, ib lub tog raj kheej hydraulic feem ntau yuav honed nrog qhov tsawg kawg nkaus ntawm cov khoom tshem tawm, thiab cov phab ntsa nyob ze ua rau cov phab ntsa thickness variation me me txaus rau kev pab cuam siab. Cov raj xa dej tsis tshua muaj siab yog qee zaum muab cov txheej txheem los yog nrog kev kho mob sab hauv rau kev tiv thaiv corrosion, vim cov qib hauv paus yog cov pa roj carbon monoxide thiab tsis muaj qhov cuam tshuam zoo rau corrosion. Automotive tube tshwj xeeb yog txiav txim siab ntev ntev nrog nruj nruj txwv kom nws tuaj yeem pub ncaj qha rau hauv kev txiav, khoov thiab tsim cov cuab yeej.
Cov lus nug nquag
Q:Puas yog DIN 2391 tseem yog tus qauv tam sim no?
A: Nws tau raug hloov pauv hauv Tebchaws Europe los ntawm EN 10305 series, feem ntau EN 10305-1 rau seamless precision steel hlab, tab sis nws tseem siv dav hauv kev xaj xaj thiab cov duab kos uas twb muaj lawm. Hauv kev xyaum, DIN 2391 kev txiav txim tau ua tiav rau EN 10305-1 nrog rau qib sib luag.
Q:Qhov txawv ntawm St 35 thiab St 52 raj yog dab tsi?
A: St 35 sib raug rau E235 nrog qhov tsawg kawg nkaus lub zog ntawm 235 MPa, thiab St 52 sib raug rau E355 nrog qhov tsawg kawg nkaus tawm los ntawm 355 MPa. Lub zog siab dua ntawm St 52 tso cai rau cov phab ntsa nyias nyias rau tib lub zog ua haujlwm hauv hydraulic thooj voos kheej kheej.
Q:Qhov kos npe ntxiv rau hauv qhov kev xa khoom txhais li cas?
A: Nws txheeb xyuas qhov kev tsim khoom kawg, piv txwv li + N rau normalised, + C rau txias rub thiab nyuaj, + A rau annealed thiab + SR rau kev ntxhov siab. Txhua tus mob muab qhov sib txawv ntawm lub zog, ductility thiab residual stress.
Q:Yam khoom twg yog siv rau hydraulic lub tog raj kheej chim?
A: Kev ntxhov siab los yog cov raj ua haujlwm zoo ib txwm muaj, vim tias nws sib xyaw ua kom muaj zog txaus nrog qhov ruaj khov thaum lub sijhawm ua haujlwm. Cold drawn thiab hard tube tsuas yog siv rau qhov uas yuav tsum tau muaj zog ntxiv thiab cov khoom yuav tsis tau tom qab machined los yog welded.
Q:Can precision raj yuav welded?
A: Yog. E235 thiab E355 yog welding tsis yog - alloy steels, thiab cov txheej txheem vuam feem ntau tsim nyog rau cov cuab yeej siv siab lossis tshuab vuam code. Lub tshav kub ntawm vuam hauv zos hloov cov khoom ntawm cov raj txias txias, yog li yuav tsum muaj kev tshaj tawm -weld stress relief.
Q:Cov ntaub ntawv twg yog muab rau cov raj?
A: Daim ntawv pov thawj kev soj ntsuam cov khoom siv rau EN 10204 yog ib txwm muab, nrog rau 3.1 hom siv qhov twg lub raj yuav muaj lub siab los yog ib feem ntawm kev nyab xeeb - cuam tshuam los ua ke.