Hais txog A709 Qib 50 cov qauv hlau thiab carbon hlau
A709 Qib 50W Khoom
A709 Qib 50W yog siab -lub zog, qis- alloy weathering steel standardized nyob rau hauv ASTM A709 specification tshwj xeeb rau unpainted txoj kev loj choj kev tsim kho. Nws ua ke nrog 50 ksi (345 MPa) yam tsawg kawg nkaus tawm lub zog nrog atmospheric corrosion kuj 4-6 npaug ntawm cov pa roj carbon steel, tsim kev tiv thaiv patina kom tshem tawm qhov xav tau ntawm cov xim.Qhov kev sib piv no qhia txog qhov txawv ntawm qhov tshwj xeeb, kev ua tau zoo-guaranteed choj steel thiab cov pa roj carbon monoxide dav dav.-purity.
Cov tub ntxhais sib piv: A709 Qib 50 vs. Hom Carbon Steel (A36)
| Yam | A709 Qib 50 (A709 Gr. 50) | Carbon hlau (piv txwv li, ASTM A36) |
|---|---|---|
| Kev faib tawm | Siab -Lub zog qis-Alloy (HSLA) Steel | Carbon Steel (Tsis yog{0}}Alloy) |
| Lub Hom Phiaj | Kev tsim kho choj (code- tau qhia) | General Structure Siv (tsev, ncej, phaj) |
| Yield zog | 50 ksi min (345 MPa) | 36 ksi min (250 MPa) |
| Tensile zog | 70 ksi min (485 MPa) | 58-80 ksi (400-550 MPa) |
| Qhov tseem ceeb Distinguishing Requirement | Yuav tsum muaj kev cuam tshuam Toughness (Charpy Test) | Impact toughness TSIS xav tau los ntawm lub neej ntawd. |
| Kev Cai Tsim Cai | AASHTO (American Assn. of State Highway Officials) | AISC (American Institute of Steel Tsim) |
| Khoom Specification Philosophy | Kev ua tau zoo + Kev sau ntawv: Yuav tsum ua kom tau raws li cov khoom siv kho tshuab thiab cov kev cai nruj / nruj rau ib qho tshwj xeeb, daim ntawv thov tseem ceeb. | Kev Ua Haujlwm Tseem Ceeb-Raws li: Yuav tsum ua kom tau raws li lub zog thiab lub hom phiaj ductility; chemistry yog theem nrab. |
| Hom Chemistry | HSLA; tej zaum yuav muaj microalloys (Cb/V) rau cov nplej refinement. | Basic C-Mn steel; dav siv tau ntau yam chemistry. |
| Huab Cua Variant Muaj? | Yog: A709 Qib 50W (rau cov txuas tsis tau pleev xim). | Tsis yog. (Rau huab cua, siv tus qauv sib txawv xws li A588). |
| Nqi & Fabrication | Cov khoom siv ntau dua. Fabrication zoo ib yam li lwm yam 50 ksi steels. | Tus nqi qis tshaj. Zoo heev thiab yooj yim fabricability. |
Kev soj ntsuam ntxaws
1. Muaj zog thiab tsim tau zoo
A709 Qib 50 yog kwv yees li 39% muaj zog ntawm cov khoom muaj zog tshaj A36. Qhov no tso cai rau cov tswv cuab me me, sib dua hauv kev tsim, uas yog qhov tseem ceeb rau kev txo cov khoom tuag nyob rau hauv ntev - ncua txuas txuas.
A36 zoo kawg nkaus tsim nyog rau feem coob ntawm cov tsev thiab tsis yog - cov qauv tshwj xeeb uas qhov kev ua kom hnyav hnyav tsis yog tus tsav tsheb loj.
2. Toughness thiab Fracture Safety (Qhov txawv tseem ceeb)
A709 Qib 50 yog tswj hwm los ntawm kev tswj kev puas tsuaj. Qhov yuav tsum tau Charpy V- qhov ntsuas qhov cuam tshuam kom ntseeg tau tias cov hlau tuaj yeem nqus tau lub zog thiab tiv thaiv qhov tawg tawg tawm hauv qab choj dynamic loading (tsheb, cua) thiab nyob rau hauv txias txias.
A36 tsis muaj qhov toughness guarantee. Nws yog haum rau static loads nyob rau hauv nruab nrab ib puag ncig. Kev siv nws hauv kev puas tsuaj - daim ntawv thov choj tseem ceeb yuav tsis muaj kev nyab xeeb thiab tsis ua raws li -.
3. Kev Ua Raws Cai thiab Daim Ntawv Thov
A709 Qib 50 yog ua ntej- pom zoo thiab teev nyob rau hauv AASHTO choj tsim code. Rau Asmeskas txoj kev loj choj, siv A36 hloov pauv yuav xav tau kev sim ntau ntxiv thiab kev ncaj ncees, thiab tej zaum yuav raug tsis lees paub.
A36 yog cov khoom siv nyob rau hauv AISC lub tsev code. Nws yog ubiquitous nyob rau hauv kev lag luam thiab industrial tsev thav ntawv.
4. "Carbon Steel" raws li ib qho kev nthuav dav
Nws yog ib qho tseem ceeb kom nco ntsoov tias "carbon steel" suav nrog ntau yam dhau A36:
Cov pa roj carbon tsawg (Mild Steel): A36, A283 (rau daim hlau), A529.
Nruab Nrab Carbon: Qib zoo li A516 Qib 70 (rau cov hlab ntsha siab), uas muaj lub zog siab dua A36 tab sis tseem raug cais raws li cov pa roj carbon steel.
Cov pa roj carbon ntau: Tsis yog feem ntau siv cov qauv; siv rau cov cuab yeej, springs, thiab lwm yam.
A709 Qib 50 tsis yog carbon hlau; nws yog HSLA steel, txhais tau tias nws muaj me me, txhob txwm tshaj tawm cov ntsiab lus ntawm microalloying (xws li Niobium / Vanadium) rau kev ua kom zoo thiab ntxiv dag zog, muab tso rau hauv cov qib kev ua tau zoo dua.
Thaum Yuav Siv Qhov twg: Daim Ntawv Qhia Kev Txiav Txim
Cov ntsiab lus
Xav txog A709 Qib 50 tsis yog tsuas yog cov hlau uas muaj zog dua, tab sis raws li cov khoom tsim nyog rau ib daim ntawv thov siab - ceg txheem ntseeg. Nws yog HSLA choj steel nrog guaranteed toughness.
Xav txog A36 ua ntau yam, kev lag luam ua haujlwm rau kev tsim kho dav dav. Nws yog cov pa roj carbon steel qhov twg lub zog thiab tus nqi yog thawj tus tsav tsheb.
Lawv tsis ncaj qha interchangeable. Siv A36 qhov twg A709 Qib 50 yuav tsum muaj kev cuam tshuam kev nyab xeeb. Siv A709 Qib 50 qhov twg A36 txaus yog kev lag luam tsis muaj txiaj ntsig. Qhov kev xaiv yog tsim los ntawm kev tswj hwm tus qauv tsim thiab qhov xwm txheej ntawm cov qauv siv.
A709 qib 50W steel yog dab tsi?
ASTM A709-50W yog cov qauv kev qhia tshwj xeeb rau cov qauv hlau feem ntau hauv kev tsim cov choj hlau. ASTM A709-50W npog lub zog siab, tsis tshua muaj cia steel qauv duab, daim hlau thiab tuav.
ASTM A709 steel qib yog dab tsi?
ASTM A709 yog tus qauv Specification rau Cov Hlau Hlau rau Cov Txuas Txuas thiab suav nrog cov pa roj carbon, siab - lub zog qis- alloy, thiab quenched thiab tempered alloy steels siv los ua cov phiaj xwm hauv kev tsim cov choj. SSAB muaj tsib qib nram qab no ntawm A709; 36, 50, 50W, HPS 50W thiab HPS 70W.
Dab tsi yog qhov txawv ntawm ASTM A572 Qib 50 thiab ASTM A709 Qib 50?
A572 Qib 50: Siv dav hauv kev siv cov qauv, nrog rau cov tsev, cov tsev sib kis, cov khoom siv, thiab kev tsim kho dav dav. Nws tsis yog tshwj xeeb optimized rau choj. A709 Qib 50: Feem ntau siv rau kev tsim kho choj thiab lwm cov qauv uas txhim kho toughness thiab weldability yog qhov tseem ceeb.
Lub zog ntawm ASTM A709 qib 50 yog dab tsi?
Qib 50 steel ntawm qhov kev qhia tshwj xeeb no yuav tsum muaj lub zog tsawg kawg nkaus ntawm 50 ksi. Siv los ua cov tswv cuab hauv kev tsim choj los yog rau cov qauv zoo sib xws.
Dab tsi yog qhov txawv ntawm ASTM A36 thiab A709?
ASTM A709 qib 36 yog cov khoom siv txuas hniav uas muaj cov pa roj carbon ntxiv rau lub zog thiab hardenability ntawm cov hlau. A36 muaj tsawg dua 0. 30% carbon thiab yog li, tsis muaj siab hardenability. ASTM A709 qib 36 steel phaj tau txhim kho corrosion kuj thiab tuaj yeem siv rau sab nraum zoov.
ASTM A572 qib 50 sib npaug li cas?
ASTM A572 Qib 50 yog sib npaug rau ntau qib steel, nrog rau qhov sib npaug thoob ntiaj teb feem ntau yog S355JR (European standard) thiab Q345B (Suav tus qauv). Qhov sib npaug zoo tshaj yog nyob ntawm qhov kev xav tau tshwj xeeb, yog li nws yog qhov zoo tshaj plaws los tham txog cov khoom tshwj xeeb thiab tus kws tshaj lij kom paub meej tias kev sib haum xeeb.
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.
