A588 Qib A thiab Qib B txhais li cas?
A588 Qib AthiabA588 Qib Byog ob qib tshwj xeeb hauv ASTM A588 tus qauv rau siab- lub zog, qis- alloy structural steel duab, daim hlau, thiab tuav nrog kev txhim kho atmospheric corrosion kuj (feem ntau hu ua "weathering steel").
Lawv tus cwj pwm tseem ceeb yog tib yam: ob qho tib si yog huab cua steels nrog qhov tsawg kawg nkaus tawm lub zog ntawm 50 ksi (345 MPa) uas tsim muaj kev tiv thaiv patina los tiv thaiv atmospheric corrosion, tso cai rau lawv siv tsis tau pleev xim rau hauv ntau daim ntawv thov. Qhov sib txawv nyob rau hauv lawv cov tshuaj muaj pes tsawg leeg (uas cuam tshuam rau weldability, lub zog sib xws, thiab tus nqi corrosion) thiab qee cov khoom siv cuab yeej cuab tam.
Core Zoo sib xws (A588 Qib A & Qib B)
Yield Strength: Ntau dua lossis sib npaug ntawm 50 ksi (345 MPa) rau cov khoom siv txog li 4 ntiv tes tuab.
Tensile Strength: Ntau dua lossis sib npaug rau 70 ksi (485 MPa).
Daim Ntawv Thov Tseem Ceeb:Unpainted txuas hniav, lub tsev sab nrauv, nthuav cov sculptures, thiab cov khoom siv hluav taws xob uas xav tau qhov zoo nkauj huab cua patina thiab kev saib xyuas kom tsawg.
Cov yam ntxwv tseem ceeb: Atmospheric corrosion kuj kwv yees li 4 npaug ntawm carbon steel (xws li, A36).
Qhov txawv tseem ceeb: A588 Qib A vs. Qib B
| Feature | A588 Qib A | A588 Qib B |
|---|---|---|
| Txhais Chemistry | "Copper-Steel" Hom. Relies hnyav rau tooj liab (Cu) ua thawj corrosion-resisting element. Phosphorus (P) kuj tseem siv tau. | "Chromium{0}}Silicon" Hom. Siv qhov sib npaug ntawm Chromium (Cr) thiab Silicon (Si) ua cov ntsiab lus alloying, nrog tooj liab. Phosphorus tsis yog lub ntsiab lus tshwj xeeb. |
| Kev txwv tshuaj lom neeg tseem ceeb | Cu: 0.25-0.40% min (tseem ceeb) P: 0.04% max (yuav siv tau txog qhov txwv no) C: Tsawg dua lossis sib npaug rau 0.19% (rau cov duab) |
Cu: 0.20% min Cr: 0.40-0.65% Yog ': 0.30-0.65% P: 0.04% max, tab sis TSIS TAU (feem ntau qis dua) C: Tsawg dua lossis sib npaug rau 0.20% (rau cov duab) |
| Carbon Equivalent (CEV) | Feem ntau qis vim qis carbon thiab tsis muaj Cr / Si siab. | Me ntsis siab dua vim qhov sib ntxiv ntawm Cr thiab siab dua Si, uas ua rau muaj zog hardenability. |
| Primary Metallurgical yam ntxwv | Laus, yooj yim chemistry. Muaj peev xwm ua tau ntau dua rau banding (segregation) vim phosphorus, cuam tshuam los ntawm - cov khoom tuab. | Ntau qhov sib npaug, niaj hnub alloy tsim. Feem ntau muaj ntau yam sib xws los ntawm - cov khoom tuab thiab zoo dua weldability kwv yees. |
| Cov Qauv Khoom Siv | Keeb kwm siv rau cov duab (nqaj, raws). Tsis tshua muaj hnub no. | Qib predominant rau niaj hnub tsim ntawm ob daim duab thiab daim hlau. Pom tau tias qhov kev ntseeg tau ntau dua, dav dav -lub hom phiaj huab cua steel. |
Vim li cas cov qib sib txawv muaj nyob & yuav xaiv li cas
Cov qib sawv cev sib txawv keeb kwm thiab metallurgical txoj hauv kev kom ua tiav huab cua tsis kam.
A588 Qib A: Ib qho qub, "tooj liab-phosphorus" formulation. Phosphorus ntxiv dag zog thiab pab tiv thaiv corrosion tab sis tuaj yeem ua rau cov hlau nkig thiab ua rau muaj kev sib cais thaum lub sij hawm solidification. Nws txoj kev siv tau tsis pom zoo rau Qib B.
A588 Qib B: Ib qho tshiab, "chromium-silicon-copper" formulation. Qhov no chemistry muab kev tiv thaiv corrosion zoo heev yam tsis muaj kev vam khom rau phosphorus, ua rau zoo dua tag nrho toughness, weldability, thiab sib xws. Tam sim no nws yog kev lag luam - tus qauv, kev xaiv xaiv rau feem ntau huab cua siv hlau.
Phau Ntawv Qhia Txog Kev Xaiv:
Rau Kev Tsim Kho Tshiab (Bridges, Architecture): Qhia A588 Qib B. Nws yog qib niaj hnub, nyiam nrog cov khoom sib xws thiab muaj ntau dua.
Rau Kev Sib Tw Cov Qauv Tseem Ceeb: Yog tias cov qauv uas twb muaj lawm (piv txwv li, tus choj laus) tau tsim nrog Qib A, qhia txog qib A rau kev kho lossis ntxiv yuav tsim nyog rau kev sib raug zoo.
Yog Tsis Qhia: Feem ntau cov mills thiab fabricators yuav default rau muab A588 Qib B thaum lub generic "A588" raug hu rau kos duab.
Cov ntsiab lus:
Ob leeg A588 Qib A thiab Qib B yog 50 ksi yield zog weathering steels. Qib A yog ib qho qub tooj liab- hom phosphorus, thaum Qib B yog cov chromium niaj hnub- silicon- hom tooj liab uas muaj qhov zoo dua tag nrho weldability thiab sib xws. Rau txhua qhov haujlwm tshiab, A588 Qib B (rau cov duab) lossis A588 Qib K (rau cov phiaj) yog qhov tsis paub meej thiab pom zoo xaiv.
1. Dab tsi yog qhov tseem ceeb corrosion-cov khoom tiv thaiv hauv A588 Qib A?
Lub hauv paus tseem ceeb yog tooj liab (Cu), yuav tsum muaj qhov tsawg kawg nkaus ntawm 0.25-0.40%, uas ua rau muaj kev tiv thaiv huab cua patina. Nws kuj tseem tuaj yeem siv Phosphorus (P) rau kev tiv thaiv ntxiv.
2. A588 Qib A txawv li cas ntawm A588 Qib B?
Qib A yog "Copper-} Phosphorus" steel, thaum Qib B yog "Chromium{1}}Silicon-Copper" steel. Qib A tso siab rau Cu thiab P; Qib B siv Cr, Si, thiab Cu yam tsis muaj kev cia siab rau P, ua rau muaj kev sib txuas zoo dua thiab sib xws.
3. Puas yog A588 Qib A tseem niaj hnub siv hauv kev tsim kho tshiab?
Tsis yog, nws yog qhov tsis siv ntau rau cov qauv tsim tshiab. Cov kev qhia tshwj xeeb niaj hnub no dhau los nyiam A588 Qib B (rau cov duab) lossis Qib K (rau daim hlau) vim lawv cov khoom sib xws thiab phosphorus ntau dua - tsis muaj tshuaj lom neeg.
4. Dab tsi yog qhov kev txhawj xeeb tseem ceeb ntawm A588 Qib A?
Ib qho kev txhawj xeeb uas muaj feem cuam tshuam yog kev sib cais lossis kev sib cais vim nws cov ntsiab lus phosphorus tso cai, uas tuaj yeem cuam tshuam los ntawm - thickness ductility thiab toughness, yuav tsum tau saib xyuas hauv cov vuam hnyav los yog tsim.
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.
