ASTM A709 Qib 50yog tus qauv rau siab- lub zog steel siv feem ntau hauv kev tsim choj, paub txog nws lub zog zoo - rau - qhov hnyav piv, weldability, thiab durability, nrog rau cov kev xaiv xws li 50W muab kev txhim kho atmospheric corrosion kuj, ua rau nws haum rau ntau yam sab nraum zoov infrastructure project. Nws cov yam ntxwv tseem ceeb yog qhov tsawg kawg nkaus tawm lub zog ntawm 50 ksi (345 MPa), nrog rau kev hloov pauv (xws li HPS 50W) muab kev txhim kho toughness thiab weathering zog rau kev thov.
Cov yam ntxwv tseem ceeb
Daim ntawv thov:Cov choj, cov tsev, siab- cov qauv nce, cov roj rigs, thiab cua ua liaj ua teb.
Corrosion Resistance:Qhov "W" hauv qib zoo li 50W qhia txog huab cua muaj peev xwm, tsim kev tiv thaiv patina.
Txheem:ASTM A709 yog cov lus qhia tshwj xeeb rau cov qauv hlau hauv txuas hniav, npog carbon, HSLA (High Strength Low Alloy), thiab quenched & tempered steels.
Lub zog:
Yam tsawg kawg nkaus lub zog ntawm 50 ksi (345 MPa)
Dab tsi yog European sib npaug ntawm ASTM A709 Qib 50?
Tsis muaj ib qho, ncaj qha European sib npaug rau ASTM A709 Qib 50 vim A709 tsis yog qib khoom siv xwb - nws yog tus choj kev tsim kho tus qauv uas suav nrog cov khoom yuav tsum tau ua, daim ntawv pov thawj zoo, thiab cov kev cai nruj rau cov cheeb tsam tshwj xeeb.
Txawm li cas los xij, cov khoom siv nyob sab Europe ze tshaj plaws ntawm lub zog thiab lub hom phiaj ntawm daim ntawv thov yog S355J2 (lossis S355K2) raws li EN 10025-2, thaum ntxiv rau kev tsim kho choj raws li EN 10025-6 lossis Eurocode execution standard EN 1090-2.
Cov ntsiab lus sib piv & piav qhia
| Yam | ASTM A709 Qib 50 | Kaw European Txoj Kev |
|---|---|---|
| Khoom Txheem | ASTM A709 / AASHTO M 270 Cov Lus Qhia | TS EN 10025-2 (rau cov khoom siv hauv paus: S355J2 / K2) |
| Yam tsawg kawg nkaus Yield Strength | 345 MPa (rau t Tsawg dua lossis sib npaug li 100 hli) | 355 MPa (rau t Tsawg dua lossis sib npaug li 16 hli, tom qab ntawd txo) |
| Key Differentiator | Yuav tsum muaj kev cuam tshuam toughness ntawm Choj Kev Pabcuam Kub Cheeb Tsam (xws li Zone 2: 20 ft-lb @ 70℃F). Integral rau tus qauv. | Toughness yog ib qho kev xav tau tshwj xeeb. Cov hlau yuav tsum raug txiav txim mus rau qhov tshwj xeeb "sub-qib" (J2, K2) thiab feem ntau yuav tsum tau ntxiv rau cov txuas hniav. |
| Choj- Daim ntawv pov thawj tshwj xeeb | Yog lawm. Tswj los ntawm AASHTO M 270, lubde factochoj khoom spec nyob rau hauv US. | Ua tiav los ntawm kev qhia cov khoom siv rau "Bridgeworks" rau EN 10025-6 (weldable fine grain steels) lossis los ntawm kev hu rau Kev Ua Haujlwm Chav Kawm hauv EN 1090-2. |
| System Equivalent | A709 Qib 50=Khoom siv + Choj Zoo System | S355J2/K2 + EN 10025-6 + EN 1090-2 Execution Class |
Yuav Ua Li Cas Qhia Txog European Sib npaug rau Txoj Haujlwm Choj:
Yuav kom ua tiav qhov sib npaug ntawm kev ua haujlwm, ib qho kev qhia hauv European feem ntau yuav suav nrog:
1.Base Khoom:S355J2 lossis S355K2 (K2 muaj kev cuam tshuam ntau zog) los ntawm EN 10025-2. Rau cov phaj tuab, S355NL (normalized) los ntawm EN 10025-3 lossis S355ML los ntawm EN 10025-4 tuaj yeem siv.
2.Toughness yuav tsum tau:Qhia meej txog Charpy V-qhov ntsuas kub thiab lub zog (piv txwv li, 27J ntawm -20 degree) raws li qhov project thaj tsam huab cua.
3.Execution Standard:Caw EN 1090-2 nrog rau Chav Ua Haujlwm tsim nyog (xws li EXC3 lossis EXC4 rau cov txuas hniav), uas hais txog qib zoo rau cov khoom siv, vuam, thiab tshuaj xyuas.
4.Optional:Qhia meej txog kev ua raws li EN 10025-6 rau "Cov khoom lag luam tiaj tus ntawm cov khoom siv hluav taws xob muaj zog hauv cov txheej txheem quenched thiab tempered lossis tempered" yog tias xav tau lub zog siab dua lossis kev kho tshwj xeeb.
Qhov tseem ceeb Caveat:
Regulatory Systems Sib txawv: A709 / AASHTO system yog cov ntawv sau, kev sib xyaw ua ke. Cov txheej txheem European yog modular, xav kom tus tsim qauv sib sau ua ke kom raug ntawm cov khoom siv, toughness, thiab cov qauv ua tiav. Tsuas yog hloov "S355J2" rau "A709 Gr 50" tsis txaus yog tsis hais txog tus choj ntxiv- cov kev xav tau zoo.
Hauv cov ntsiab lus, cov khoom siv ze tshaj plaws yog S355J2 / K2, tab sis qhov tseeb ua haujlwm sib npaug yuav tsum muaj European specification pob uas rov ua dua qhov kev sib xyaw ua ke, tawv, thiab cov ntaub ntawv pov thawj uas muaj nyob hauv ASTM A709 / AASHTO M 270 tus qauv rau kev tsim choj.
1. ASTM A709 Qib 50 steel siv rau dab tsi?
Nws yog feem ntau siv rau kev tsim kho choj, suav nrog girders, trusses, thiab lwm yam khoom siv, vim nws lub zog siab thiab weldability yuav tsum tau nyob rau hauv txoj kev loj thiab railway choj.
2. Lub zog ntawm ASTM A709 Qib 50 yog dab tsi?
Qhov tsawg kawg nkaus yield zog ntawm A709 Qib 50 yog 50 ksi (345 MPa) rau cov khoom thicknesses txog li 4 ntiv tes (100 hli).
3. Qhov txawv ntawm A709 Qib 50 thiab A572 Qib 50 yog dab tsi?
A709 Qib 50 tshwj xeeb yog tsim thiab sim ua kom tau raws li kev tsim kho choj (nrog rau cov qauv tawv thiab vuam), thaum A572 Qib 50 yog cov qauv hlau dav dav yam tsis tas yuav tsum txuas ntxiv no - cov ntawv pov thawj tshwj xeeb.
4. Puas yog ASTM A709 Qib 50 weldable?
Yog lawm, nws yog tsim los rau weldable raws li nruj choj welding codes (xws li AWS D1.5), tab sis yuav tsum tau cov txheej txheem tsim nyog thiab feem ntau siv tsawg -hydrogen kev coj ua thiab tshwj xeeb muab tub lim hlau.
5. Dab tsi yog qhov cuam tshuam toughness rau A709 Qib 50?
Nws yuav tsum tau Charpy V- ntsuas qhov cuam tshuam, feem ntau ntawm 40 ft-lb (54 J) ntawm 70℃F (21 degree) lossis qis dua nyob ntawm qhov kev pabcuam (xws li Zone 1, 2, lossis 3).
6. Cov European sib npaug ntawm ASTM A709 Qib 50 yog dab tsi?
Qhov sib npaug nyob sab Europe zoo tshaj plaws yog S355 series steel (xws li S355J2 lossis S355K2) raws li EN 10025-2, tab sis nws tsis suav nrog tib cov ntawv pov thawj tshwj xeeb raws li A709.
7. ASTM A709 Qib 50 puas tuaj yeem siv rau hauv cov tsev?
Yog lawm, nws tuaj yeem siv tau, tab sis feem ntau nws kim dua vim nws tus choj - kev ntsuas qib thiab ntawv pov thawj, yog li A572 Qib 50 lossis A992 muaj ntau dua rau kev tsim vaj tsev.
8. Cov tshuaj muaj pes tsawg leeg ntawm ASTM A709 Qib 50 yog dab tsi?
Nws yog siab- zog qis- alloy (HSLA) hlau nrog txwv ntawm carbon, manganese, phosphorus, sulfur, thiab micro- alloys xws li vanadium lossis niobium rau lub zog thiab tawv.
9. Cov qib sib txawv ntawm ASTM A709 yog dab tsi?
ASTM A709 suav nrog ntau qib: 36, 50, 50W, 70, 70W, 100, thiab 100W, qhov "W" qhia txog huab cua hloov pauv nrog corrosion kuj.
10. A709 Qib 50 piv rau A709 Qib 50W li cas?
Qib 50 yog cov qauv hlau uas xav tau cov txheej txheem tiv thaiv corrosion, thaum Qib 50W yog cov hlau tsis zoo uas tsim cov patina tiv thaiv thiab siv tsis tau pleev xim rau hauv qhov chaw tsim nyog.
Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.
