Lub tshuab steel uas muaj qhov siab thiab tau txwv rau cov khoom uas muaj ntau qhov nyob

Yog li cas lub tshuab steel uas muaj qhov siab thiab tau txwv yog qhov zoo heev rau cov khoom uas nyob hauv qhov chaw uas muaj ntau qhov nyob

Cov qhov zoo tshaj plaws: tsis tuaj yeem pheej, qhov nyob rau hauv cov khoom, thiab qhov nyob rau hauv qhov chaw nyob ntev

Cov ntawv loj uas muaj cov ntaub tsis tuaj (galvanized steel boards) uas muaj qhov kev pab tswj hwm rau cov ntaub tsis tuaj (corrosion) los ntawm qhov coating uas muaj zinc uas tau txais los ntawm kev ntsuas ntaub tsis tuaj (hot dip zinc coating) uas ua rau cov ntaub tsis tuaj (metal surface) thiab cov ntaub tsis tuaj (zinc) yog ib qho tshwj xeeb. Qhov kev sib sau (bonding) no pab tswj hwm rau cov ntaub tsis tuaj (rust) nyob rau hauv cov qhov chaw uas yuav tsum muaj kev tswj hwm siab, raws li nyob rau hauv cov chaw ua haujlwm (industrial sites) lossis rau hauv cov rooj (bridges) nyob rau hauv qhov chaw uas muaj dej (coastal bridges) uas muaj cov dej (salt air) uas pab tswj hwm rau cov ntaub tsis tuaj (materials). Thaum kawg, thaum kawg, cov ntawv loj no yuav tsum muaj kev pab tswj hwm rau cov ntaub tsis tuaj (heavy loads) uas yuav tsum muaj kev pab tswj hwm rau cov ntaub tsis tuaj (crane rail applications) uas yuav tsum muaj kev pab tswj hwm rau cov ntaub tsis tuaj (weights) uas nyob rau hauv qhov kev pab tswj hwm (20 tons). Cov ntaub tsis tuaj (material) no kuj muaj kev pab tswj hwm rau cov ntaub tsis tuaj (tensile strength) uas nyob rau hauv qhov kev pab tswj hwm (550 MPa) rau cov ntaub tsis tuaj (grades) li S550GD+Z, uas pab tswj hwm rau cov ntaub tsis tuaj (structures) uas yuav tsum muaj kev pab tswj hwm rau cov ntaub tsis tuaj (flexibility) tsis tau tshem tawm, raws li cov ntaub tsis tuaj (earthquake resistant building frameworks). Cov kev ua haujlwm (Real world testing) tau pom tias cov ntaub tsis tuaj (coated steels) no yuav tsum muaj kev pab tswj hwm rau cov ntaub tsis tuaj (50 to 75 years) thaum muaj kev tswj hwm rau cov chaw (rural areas), tab sis qhov no yuav tsum muaj kev pab tswj hwm rau cov ntaub tsis tuaj (20 to 50 years) thaum muaj kev tswj hwm rau cov chaw (factories) lossis cov chaw (chemical plants). Tab sis, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, thaum kawg, tha......

Kev sib piv ntawm cov cim tswv yim tseem ceeb: ASTM A653 (SS340, G90) vs. EN 10346 (S550GD+Z)

Lub steel ASTM A653 SS340 thiab lub coating zinc G90 yog qhov tseem ceeb rau kev siv hauv kev ua haujlwm uas xav tau kev ua haujlwm zoo thiab kev ntsuas zoo rau hauv 340 MPa yield strength. Ntawd yog qhov tseem ceeb rau kev ua haujlwm uas xav tau kev kaw thiab kev ua haujlwm, raws li kev ua haujlwm rau lub conveyor frame systems. Tias lwm qhov, EN 10346's S550GD+Z yog qhov ua los rau kev siv hauv kev ua haujlwm uas xav tau kev siv ntau. Nrog rau lub yield strength tsawg tshaj 550 MPa, cov no siv tau zoo dua lawm cov lwm yam uas muaj kev siv ntau. Peb pom nws siv ntau hauv cov kev siv uas xav tau kev siv ntau raws li cov mezzanine structures rau cov warehouse uas muaj ntau tsev thiab nyob rau hauv cov offshore crane runway supports. Cov kev test uas ua los ntawm cov neeg sib txawv tau qhia tias S550GD+Z tuaj yeem siv tau ntau dua 30 percent ntawm kev siv ntau dua ua ntej yuav muaj kev kaw tshem. Thaum cov micro alloy content yog qhov tseem ceeb rau cov neeg ua haujlwm ua haujlwm, cov neeg ua haujlwm siv cov standards no tuaj yeem nyob deb ntawm kev paub tias cov zinc coatings yuav nyob nruab nrab ntawm 5,200 psi raws li cov kev test ASTM D3359. Ntawd qhia tias cov kev siv hauv kev ua haujlwm uas cov no muaj yuav muaj kev siv zoo thiab kev tswj xyuas rau kev kaw tshem hauv lub sijhawm.

Lus piav qhia txog kev siv :

• Tsim los ntawm kev xyuas txog kev puas tsuaj ntawm lub caij (2023)
• Kev soh tshuam txog qhov kev ua haujlwm tau los ntawm cov lus piav qhia ntawm cov kev xyuas rau cov ntaub ntawv thiab cov ntaub ntawv sib tw

Kev puas tsuaj thiab Kev Tso Cai Rau Qhov Ntseeg: Qhov kev sib npaug ntawm cov ntaub ntawv thiab cov ntaub ntawv uas tau tso cai

Kev tso cai rau qhov ntaub ntawv los ntawm kev tso rau hauv cov dej tshaib (ASTM A653 G90): Qhov loj, qhov kev nyuaj, thiab qhov sijhawm siv nyob rau hauv cov rooj thiab cov rooj

Los ntawm kev siv ASTM A653 G90 standard, cov ntaub tso cia yuav tsum muaj zinc coating nyob rau hauv 0.90 oz per square foot (lossis nyob rau hauv 275 grams per square meter) los ntawm qhov coating. Qhov no ua rau cov ntaub tso cia muaj kev nyab xeeb zoo thiab tau txais kev puas tsuaj los ntawm cov dej thiab cov cheeb tsam uas yuav tsum tsis tau los ntawm qhov coating. Cov kev sim hauv lub tsev tswj hwm los ntawm cov rooj tswj hwm tau muaj tshwj xeeb tias cov coating no yuav muaj zog nyob hauv 75 xyoo los ntawm cov chaw uas muaj kev sib thag zoo. Thaum cov ntaub tso cia tau nyob hauv kev sib thag ntawm kev cuam tshuam ntawm cov dej thiab kev sib thag ntawm cov ntaub tso cia, lawv tsis yog kev tshem tawm los ntawm qhov coating. Cov kev nyab xeeb ntawm qhov coating yog qhov zoo heev, ua rau lawv muaj zog nyob hauv 3,600 pounds per square inch, uas yog qhov tias cov coating yuav tsis tau tshem tawm thaum muaj kev cuam tshuam los ntawm cov chaw uas muaj kev cuam tshuam ntau dua li cov platform thiab cov railway system. Cov kev ua haujlwm los ntawm NACE International tau pab tso cia tias cov ntaub tso cia uas tau muaj galvanization yuav tsum tau siv dua li cov ntaub tso cia uas tau muaj kev kho tshuaj ntau dua li 50% thiab yuav muaj kev npaj tau ntau dua li 30 xyoo.

Kev Tshuaj xyuam rau qhov chaw ua haujlwm: Carbon-Manganese thiab Microalloyed (Nb/V/Ti) Steels rau Galvanizing Reactivity thiab Kev nyuaj

Qhov chaw ua haujlwm yog qhov uas tswj hwm cov lus qhia txog qhov zoo thiab qhov ntsuas ntawm kev ua haujlwm:

Thaum cov kws tsim khoom muab niobium lossis vanadium rau hauv steel ntau yam, lawv tau txais qhov tseem ceeb uas ua rau thaum hot rolling. Qhov sib sau ntawm kev ua haujlwm no yog qhov ua rau steel muaj qhov ntau ntau thiab qhov no yog qhov ua rau microalloyed steels tuaj yeem txog qhov ntau ntau (yield strength) zoo li 550 MPa thiab siab dua. Ntawd, qhov kev sib sau ntawm zinc thiab iron alloys kuj tau ua zoo dua. Qhov uas ua rau cov khoom no muaj qhov tseem ceeb yog qhov lawv tuaj yeem xav txog kev sib sau ntawm cov khoom sib tw. Qhov no cuam ntsis rau kev tshem tawm cov kev sib sau uas yuav ua rau cov khoom muaj qhov nyuaj thiab tsis zoo rau kev sib sau ntawm cov khoom sib tw, uas yuav ua rau cov khoom sib tw tsis zoo thaum muaj kev sib sau ntau yam. Thaum muaj kev sib sau ntau yam, carbon-manganese steels thib ob uas muaj silicon ntau yuav sib sau ntau heev. Qhov no ua rau muaj cov layers ntawm alloy uas loj thiab yuav ua rau muaj kev puas ntev. Yog li no, cov kws kho mob uas tsim cov tsev rau hauv qhov chaw uas muaj kev puas ntev los sis thiab cov kws kho mob uas tsim cov rooj uas xav tau qhov ntau thiab kev npaj rau kev puas ntev, lawv yuav tshuaj xyuas rau kev siv microalloyed steel rau cov galvanized boards. Cov khoom no yuav ua haujlwm zoo dua thaum muaj kev xav tau heev.

Kev Puas Tsuaj Ntawm Cov Qhov Kev Tswj Hwm Txoj Cai Ntawm Cov Qhov Kev Tswj Hwm Ntau & Kev Tswj Hwm Los

Cov Qhov Kev Tswj Hwm & Kev Tswj Hwm ntawm Cov Qhov Kev Tswj Hwm: SS340 vs. S550GD+Z nyob rau hauv cov qhov kawm thiab cov qhov kawm

Thaum peb pab tshuaj xyuas txog kev nyab xeeb ntawm cov khoom sib tw, peb yuav tsum nrhiav saib rau cov lej uas peb tuaj yeem ntsuas tau. ASTM SS340 muaj qhov kev nyab xeeb ntawm 340 MPa uas tsim rau kev sib tw lub tsev thiab lwm yam khoom sib tw zoo li no, tab sis EN S550GD+Z yog siab dua li no ntau, nws muaj qhov kev nyab xeeb ntau dua 550 MPa. Qhov kev nyab xeeb siab no yog qhov txaus rau kev sib tw cov khoom uas muaj nqi siab li cov rooj tswv yim rau cov rooj tswv yim hauv qhov chaw uas muaj nqi 50 kN per square meter thiab thiaj li yuav tshwm sim dua li no. Qhov kev nyab xeeb siab no txo qhov thickness ntawm cov khoom los ntawm 25% thiab tso cai rau cov neeg sib tw ua kom cov khoom tsis raug kev puas tsuaj. Peb tau pom qhov no nyob rau hauv kev ua haujlwm nyob rau cov chaw sib tw hauv cov tsev tswv yim. Nyob rau cov chaw sib tw hauv cov tsev tswv yim, cov kev tshuaj xyuas tau pom tias S550GD+Z tsis puas tsuaj 18% li SS340 thaum muaj cov nqi zoo li no. Qhov kev nyab xeeb zoo li no yog qhov uas ua rau cov neeg sib tw ntau yam txaus siab rau nws rau kev sib tw cov khoom uas tsis muaj kev sib tw.

Kev sib tw thiab kev nyab xeeb rau cov nqi sib tw: Cov lus nug los ntawm cov tsev tswv yim thiab cov tsev mezzanine

Kev ntxiv ntawm lub tshuab los ua rau nws yuav tsis tau, uas yog qhov uas muaj peb lub tshuab (ductility) thiab muaj kev siv kev ntsuas qhov yuav (elongation rates), yog qhov tseem ceeb rau kev tswj hwm qhov kev puas tsuaj (fatigue resistance) thaum muaj kev tswj hwm ntau dua. Lub tshuab sib xyaw (structural steel) SS340 feem ntau muaj qhov yuav ntawm 20-23%, uas yog qhov zoo rau kev xaav (buildings) thiab lwm yam khoom uas tsis mov. Tiamsi thaum peb saib cov khoom uas yuav tsum nyob rau hauv qhov chaw uas muaj kev khaub (vibration) ntau dua, S550GD+Z muaj qhov tshwj xeeb. Lub tshuab no muaj qhov yuav ntawm 12-15% thiab muaj kev tswj hwm qhov puas tsuaj (toughness) zoo dua. Kev test rau hauv kev ua haujlwm ntawm kev ua lub tshuab (automotive manufacturing plants) uas muaj qhov tshuab mezzanine uas tau txais kev mov ntawm cov forklift ntau dua rau txhua hnub, cov tshuab uas siv S550GD+Z tsis muaj qhov tshuab puas (crack free) rau 5 xyoo. Qhov kev ua haujlwm no yog 3 zaug qhov kev ua haujlwm ntawm cov tshuab sib xyaw. Vim li cas no? Qhov tseem ceeb yog rau cov tshuab sib xyaw (microalloy additions) uas pab muab kev tswj hwm (stress) mus rau txhua qhov ntawm cov khoom, tsis pub nws nyob rau qhov chaw uas muaj kev ntxiv (weak spots), uas yog qhov uas pab cov tshuab carbon manganese thiaj puas tsuaj thaum muaj kev tswj hwm ntau dua.

FAQ

Yam twg ua rau cov laus loj tsoob ntawm galvanized steel (steel uas muaj zinc) tsis raug khaub ncua?

Cov laus loj tsoob ntawm galvanized steel (steel uas muaj zinc) muaj cov zinc uas tau tshuab nrog qhov chaw tsoob, thiab muaj kev nyab xeeb rau qhov khaub ncua, tias yuav tsis raug khaub ncua hauv cov chaw uas khaub ncua heev li cov chaw ua haujlwm thiab cov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau h......

Cov laus loj tsoob ntawm galvanized steel (steel uas muaj zinc) yuav nyob tau dab tsi xyoo hauv cov chaw sib txawv?

Cov laus loj tsoob ntawm galvanized steel (steel uas muaj zinc) yuav nyob tau 50 rau 75 xyoo hauv cov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau hauv qhov chaw nyob rau......

Yam twg yog qhov sib txawv rau ASTM A653 SS340 thiab EN 10346 S550GD+Z?

ASTM A653 SS340 yog qhov tshwj xeeb rau kev ua haujlwm zoo, muaj kev pheej yig ntawm 340 MPa, thiab tsim rau kev ua haujlwm. EN 10346 S550GD+Z yog qhov tshwj xeeb rau cov haujlwm uas nyuaj heev, muaj kev pheej yig ntawm 550 MPa, thiab tsim rau kev tswj cov haujlwm uas nyuaj heev.

Yam twg ua rau microalloying (kev ntxiv cov ntaub ntawv ntau dua) ua kom cov laus loj tsoob ntawm galvanized steel (steel uas muaj zinc) zoo dua?

Kuam ntxiv ntawm cov qhov chaw leej twg li nyobium thiab vanadium ua rau cov kab hluav tais xwm zoo dua, txog qhov siab dua ntawm qhov ua haujlwm thiab qhov ua haujlwm ntawm zinc-iron alloy zoo dua, npaj qhov ua haujlwm, thiab tshem tawm qhov ua haujlwm ntawm cov kab hluav tais uas yuav ua rau muaj kev tsis zoo.