Dab tsi "High-Strength Steel" txhais tau tias hauv kev xyaum
Siab -Steel structural steel feem ntau yog to taub raws li qib uas muaj qhov tsawg kawg nkaus yield zog ntawm 460 MPa los yog siab dua, xws li S460 thiab S690 rau EN 10025, sib piv nrog cov pa S355. Hauv Hong Kong cov phiaj xwm kev xaiv qib mus deb dhau tus lej tawm. Cov kev qhia tshwj xeeb yuav tsum ua raws li cov qauv tsim, qhov project specifications thiab kev pom zoo ntawm tus kws pab tswv yim; ntaub ntawv pov thawj thiab traceability; metallurgical zog xws li cuam tshuam toughness thiab vuam tus cwj pwm; Cov qauv txwv xws li kev sib txuas muaj peev xwm, ntsuas hluav taws xob, buckling thiab deflection; thiab cov khoom lag luam suav nrog lub sijhawm ua khoom, tus nqi thiab kev pom zoo hloov pauv. Hauv luv luv, qib siab dua, qhov xav tau ntau dua ntawm engineering thiab kev pom zoo saw nyob ib puag ncig nws.
Peb Qib: S355, S460 thiab S690
| Qib | Yam tsawg kawg yield zog | Hom kev siv | Kev pom zoo thiab fabrication complexity |
|---|---|---|---|
| S355 | 355 MPa rau | General tsev steelwork: kab teeb, kem, platforms, bracing, gusset daim hlau | Zoo tsim; streamlined txoj cai pom zoo thiab paub tab cov txheej txheem vuam |
| S460 | 460 MPa rau | Lub zog-cov tswv cuab tswj hwm, ntev- ncua kab teeb, kab hnyav, hnyav- txwv cov khoom | Siab dua: kev soj ntsuam nruj dua ntawm vuam, traceability thiab kev lag luam viability |
| S690 | 690 MPa ua | Ultra-ntev- ncua cov qauv, hnyav hloov cov tswv cuab, hnyav-tseem ceeb thiab ua yeeb yam project | Qhov siab tshaj plaws: tus kws tsim qauv, kev yuav khoom, vuam, NDT thiab kev pom zoo yuav tsum muaj |
Cov txiaj ntsig tau ua raws EN 10025-2 rau S355, EN 10025-3/4 rau S460 thiab EN 10025-6 rau S690, thiab sib txawv nrog cov phaj tuab. Lub modulus ntawm elasticity ntawm cov hlau tseem nyob ib ncig ntawm cov qib no, yog li qib siab dua tsis los ntawm nws tus kheej txo deflection lossis txhim kho tus cwj pwm buckling.
Vim li cas S355 tseem yog qhov kev xaiv qub
Kev ntseeg tau ntawm kev muab khoom: S355 yog ib qho kev qhia thoob ntiaj teb; Cov kws pab tswv yim, cov neeg cog lus, fabricators thiab mills paub txog nws cov kev txwv, yog li muaj kev vam meej.
Kev lees paub raws cai: kev ua haujlwm dav dav hlau hauv S355 ua raws txoj kev pom zoo ncaj qha, thiab cov kws pab tswv yim tsis tshua xav tau kev txiav txim siab dav.
Pov thawj weldability: vuam txheej txheem specifications, preheat thiab cua sov input tswj tau nkag siab zoo thiab tswj tau, nrog rau kwv yees xav tau NDT.
Cov kev sib txuas uas xav tau: bolt shear, weld caj pas, phaj bearing thiab stiffener nthuav dav nyob rau hauv zoo - kuaj ntau yam.
Kev tswj hwm txwv lub xeev: ntau tus tswv cuab hauv tsev tau tswj hwm los ntawm buckling stability lossis deflection es tsis yog lub zog ntshiab, yog li kev nce qib tsis txo cov seem thiab tsuas yog ntxiv cov nqi.
Thaum Qib S460 Yog Kev Ncaj Ncees
Lub zog-cov tswv cuab tswj hwm: hloov kab teeb, ntev- ncua cov kab teeb ci tseem ceeb, cov kab hnyav thiab cov khoom siv platform kab teeb uas txo cov phaj thickness los yog seem qhov tob yog siv tau.
Headroom- txwv tsis pub tej yaam num: kev lag luam retrofits, ntxiv dag zog rau hauv qab daus thiab alternations ua hauj lwm qhov twg seem qhov tob tsis tuaj yeem nce tab sis yuav tsum muaj peev xwm.
Qhov hnyav- txwv cov khoom: qhov twg tus tswv cuab qhov hnyav txwv qhov chaw hoisting lossis thauj, txo cov neeg tuag los ntawm qib siab dua los ua qhov zoo tshaj plaws.
Localized siab- thaj tsam kev nyuaj siab: tsom truss chords, tseem ceeb bracing thiab hloov cov tswv cuab ntawm cov node, es tsis txhob qhia cov qib siab dua nyob rau hauv tag nrho lub tsev.
Qib S460 nqa cov khoom siv tus nqi them nqi, muaj peev xwm ua tau ntev dua thiab kev siv vuam nruj dua thiab NDT cov cai. Yog hais tias qhov txiaj ntsig tonnage txuag yog marginal, tag nrho cov nqi ntawm qhov project yuav nce.
Thaum Qib S690 yuav tsum tau txiav txim siab
S690 belongs rau qhov kev faib tawm hwm thiab tsis yog cov lus qhia niaj hnub rau cov qauv tsim steelwork. Nws khwv tau nws qhov chaw nyob qhov twg: cov khoom hnyav ua rau kev thauj mus los, hoisting lossis erection technically unfeasible; cov qauv yog ultra-ntev-span lossis complex, xws li ntev-span ru tsev, loj hloov qauv los yog landmark tej yaam num; cov tswv cuab uas muaj kev ntxhov siab heev yuav txwv tsis pub muaj cov ntu loj heev; headroom thiab facade txwv txwv tsis pub ntxaum profiles; los yog ib qhov project yog tsav los ntawm kev ua qauv qhia ntawm advanced engineering. Nyob rau hauv txhua rooj plaub, cov lus nug tseem ceeb tsis yog seb S690 puas tsim nyog, tab sis seb qhov project puas muaj kev tsim, kev yuav khoom, vuam, NDT thiab kev tso cai muaj peev xwm xa nws.
Q355, Q460 lossis Q690 Hloov S355, S460 lossis S690?
Suav qib Q355, Q460 thiab Q690 (GB/T 1591) sib piv cov qib zog nrog cov qib Eurocode, tab sis kev hloov pauv tsis siv neeg. Ob chav kawm sib txawv hauv cov qauv kev tswj hwm, pawg tuab, kev txwv tshuaj lom neeg muaj pes tsawg leeg, sib npaug ntawm cov pa roj carbon monoxide, Charpy cuam tshuam cov kev xav tau, cov ntawv pov thawj thiab cov cai tshuaj xyuas. Hauv Hong Kong cov phiaj xwm kev hloov pauv yuav tsum ua kom ncaj ncees los ntawm kev ntsuas cov khoom sib npaug uas suav nrog cov qauv kev tswj hwm, tawm los thiab lub zog tensile, elongation, cuam tshuam toughness, CEV, weldability thiab traceability, thiab nws yuav tsum tau txais los ntawm tus kws pab tswv yim. Qhov twg cov phaj hnyav yog welded nyob rau hauv siab ceev, los ntawm -thickness zog rau BS EN 10164 (Z15, Z25 los yog Z35) feem ntau yuav tsum tau kom tsis txhob lamellar tearing.
Cov lus nug nquag
Puas qib steel siab dua txhim kho hluav taws kub?Tsis yog. Hlau poob lub zog thiab tawv sai sai thaum qhov kub thiab txias, thiab tus qauv hluav taws kub yuav tsum raug xam raws li kev tswj hwm hluav taws tsis hais qib twg. Cov qib siab dua tsis yog qhov hluav taws kub ntau dua - tiv taus.
Vim li cas qhov cuam tshuam toughness yuav tsum tau txawm nyob rau hauv ib qho kev nyab xeeb me me?Impact toughness tswj tsis kam rau nkig tawg nyob rau hauv dynamic loading thiab lub zos kev nyuaj siab concentrations. Cov kws pab tswv yim tsis lees txais lwm cov ntaub ntawv uas nws daim ntawv pov thawj tsis muaj cov ntaub ntawv cuam tshuam rau Charpy, tsis hais txog huab cua puag ncig.
Z-kev taw qhia (los ntawm- tuab) yog dab tsi?Nws ntsuas lub peev xwm deformation ntawm cov phaj hnyav los ntawm nws cov thickness, tiv thaiv lamellar tearing qhov twg welds impose nro hla lub phaj thickness. BS EN 10164 chav kawm Z15, Z25 thiab Z35 feem ntau tau teev tseg rau cov pob qij txha hnyav.
Vim li cas ho tsis qib siab dua txo deflection?Deflection nyob ntawm qhov nruj, thiab cov qauv ntawm elasticity ntawm steel yog ze li qub rau txhua qib. Yog hais tias ib tug tswv cuab raug tswj hwm los ntawm deflection lossis stability, qib siab zog tsis muaj txiaj ntsig.
Puas siab -lub zog steel ua kom yooj yim rau kev sib txuas?Tsis yog. Cov tswv cuab muaj peev xwm siab dua tsis txo qis lub zog sab hauv los ntawm cov pob qij txha, thiab cov ntu ntu profile feem ntau tawm tsawg dua chav rau bolts, welds thiab stiffeners, ua rau kev sib txuas nthuav dav ntau congested.
Cov ntaub ntawv dab tsi txhawb kev hloov khoom siv hauv Hong Kong?Kev ntsuam xyuas cov khoom sib npaug nrog tus qauv hla- hais txog, kev sib piv cov tshuab thiab tshuaj lom neeg, CEV thiab Charpy tsom xam, mill test daim ntawv pov thawj tshuaj xyuas thiab cov pov thawj traceability, xa rau tus kws pab tswv yim pom zoo.