ASTM A537 Qib 2yog cov cua sov-kho carbon-manganese-silicon steel phaj rau fusion-welded siab hlab ntsha thiab cov qauv, muab lub zog siab dua li Class 1 vim quenching thiab tempering, ua rau nws zoo tagnrho rau roj, roj, thiab petrochemical daim ntaub ntawv xav tau kev txhim kho toughness ntawm nruab nrab mus rau qhov kub thiab txias. Nws paub txog lub zog zoo, toughness, thiab weldability, nrog rau kev siv nyob rau hauv cov tso tsheb hlau luam, boilers, thiab cryogenic cia.
Tshuaj muaj pes tsawg leeg
| Qib | C | Si | Mn | P | S | Cr | Mo | Ni | Cu | |
|---|---|---|---|---|---|---|---|---|---|---|
| ¡U 40 mm | >40 mm | |||||||||
| A537 Chav Kawm 2 | 0.24 | 0.15/0.50 | 0.70/1.35 | 1.00/1.60 | 0.035 | 0.035 | 0.025 | 0.080 | 0.25 | 0.35 |
Mechanical Properties
| Qib | Tawm tswv yim (MPa) | Tensile (MPa) | Elongation | Thickness | |
|---|---|---|---|---|---|
| A50 mm | A200 mm | ||||
| A537 Chav Kawm 2 | 415 | 550/690 | 22% | - | ¡Ü 65 |
| 380 | 515/655 | 22% | - | > 65 ¡Ü 100 | |
| 315 | 485/620 | 22% | - | > 100 ¡Ü 150 | |
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1. Steelmaking thiab Rolling
Melting & Refining: Cov hlau yog tsim los ntawm Electric Arc Furnaces (EAF) los yog Basic Oxygen Furnaces (BOF), ua raws li Ladle Refining (LF) thiab Nqus Degassing (VD) kom ntseeg tau siab purity thiab tsawg leej faj / phosphorus cov ntsiab lus.
Fine Grain xyaum: Cov hlau yuav tsum raug tuathiab tsim kom zoo austenitic grain loj.
Kub Rolling: Slabs yog rhuab thiab dov mus rau lub hom phiaj thickness. Thaum Thermo-Mechanical Controlled Processing (TMCP) tej zaum yuav raug siv, cov khoom kawg yog ua tiav los ntawm kev kho cua sov tom ntej.
2. Core Thaum tshav kub kub kho (Quenched & Tempered)
Qhov no yog theem tseem ceeb uas sib txawv Chav Kawm 2 los ntawm Chav Kawm 1 (uas tsuas yog normalized).
Austenitizing / Quenching: Cov phaj yog rhuab mus rau qhov kub tsis sib xws (feem ntau nyob ib ncig ntawm 860℃- 880 degree) thiab tom qab ntawd txias sai heev siv cov tshuaj tsuag dej lossis immersion quenching system. Cov txheej txheem no hardens cov hlau los ntawm kev hloov cov microstructure.
Tempering: Cov phaj quenched yog reheated rau qhov kub ntawm yam tsawg 595℃(1100℃F)thiab tuav rau lub sijhawm teev tseg (feem ntau yog 30 feeb ib nti ntawm tuab). Qhov no restores toughness thiab ductility thaum tuav siab yield zog.
3. Kev tshuaj xyuas thiab kev tswj xyuas zoo
Txhawm rau kom ua raws li ASTM A537 / A537Mtus qauv, cov kev xeem hauv qab no yog qhov yuav tsum tau ua:
Mechanical Testing: Kev ntsuam xyuas Tensile (kom paub tseeb tias Yield Strength Ntau dua lossis sib npaug ntawm 415 MPa thiab Tensile Strength 550-690 MPa) thiab kev ntsuam xyuas Elongation.
Kev sim cuam tshuam: Charpy V-Notch (CVN) cov kev ntsuam xyuas cuam tshuam feem ntau yuav tsum tau ua kom ntseeg tau qis-kub toughness.
Nondestructive Examination (NDE)Tom ntej: Ultrasonic Testing (UT)yog ua raws li ASTM A435 lossis A578 txhawm rau txheeb xyuas cov laminations sab hauv lossis qhov tsis xws luag.
4. Kev tsim khoom hauv qab
Rau cov tuam txhab tsim cov hlab ntsha los yog cov tank:
Txiav: CNC nplaim taws lossis Plasma txiav yog ib txwm muaj. Preheating tej zaum yuav xav tau rau cov phaj tuab los tiv thaiv ntug tawg.
Txias txoj kev: A537 Cl.2 muaj formability zoo; Txawm li cas los xij, qhov tsawg kawg nkaus khoov vojvoog yog loj dua li cov hlau me me vim nws lub zog ntau dua.
Vuam: Siv tau zoo heev siv cov txheej txheem xws li SMAW, GMAW, lossis SAW. Tsawg-hydrogen electrodes (piv txwv li, E8018 series) raug pom zoo kom phim lub hauv paus hlau lub zog.
Tshaj tawm -Kev kho cua sov (PWHT): Raws li txoj cai ntawm lub nkoj (piv txwv li, ASME Tshooj VIII), PWHT yuav tsum tau ua kom txo tau cov kev ntxhov siab, tab sis kev saib xyuas yuav tsum tsis txhob siab tshaj qhov qub tempering kom tsis txhob softening cov khoom.
Vim li cas thiaj xaiv peb:
Koj tuaj yeem tau txais cov khoom zoo meej raws li qhov koj xav tau ntawm tus nqi tsawg kawg nkaus.
Peb kuj muab Reworks, FOB, CFR, CIF, thiab qhov rooj rau qhov rooj tus nqi xa khoom. Peb xav kom koj ua deal rau shipping uas yuav zoo heev.
Cov ntaub ntawv uas peb muab yog muaj tseeb tiag, txoj cai los ntawm raw cov ntaub ntawv xeem daim ntawv pov thawj mus rau qhov kawg dimensional nqe lus.
Peb lav muab cov lus teb tsis pub dhau 24 teev (feem ntau hauv tib lub sijhawm)
Koj tuaj yeem tau txais cov khoom hloov pauv, zeb xa khoom nrog txo lub sijhawm tsim khoom.
Peb tau mob siab rau peb cov neeg siv khoom. Yog tias nws yuav tsis tuaj yeem ua tau raws li koj cov kev xav tau tom qab kuaj xyuas tag nrho cov kev xaiv, peb yuav tsis ntxias koj los ntawm kev cog lus tsis tseeb uas yuav tsim kev sib raug zoo rau cov neeg siv khoom.
Tau txais cov lus muaj nuj nqis rau ASTM A537 Chav Kawm 2, Hu rau GNEE Steel.
Puas yog A537 Chav Kawm 2 xav tau tom qab-weld heat treatment (PWHT)?
PWHT is not mandatory but recommended for thick sections (>1.5 ntiv tes) lossis siab - kev siv kev ntxhov siab. Nws relieves welding residual stresses, txo qhov kev pheej hmoo tawg, thiab txhim kho qhov seem stability. PWHT suav nrog cua sov rau 1100-1200℃F (593-649 degree) thiab tuav ua ntej txias.
Qhov modulus ntawm elasticity ntawm A537 Class 2 yog dab tsi?
Nws cov qauv ntawm elasticity yog kwv yees li 29 × 10⁶ psi (200 GPa), tus qauv rau carbon thiab qis- alloy steels. Tus nqi no yog siv rau hauv cov qauv tsim los suav deflection thiab kev ntxhov siab nyob rau hauv kev thauj khoom, kom ntseeg tau tias cov hlab ntsha siab tswj cov duab thiab kev ncaj ncees.
A537 Chav Kawm 2 tau soj ntsuam zoo li cas?
Kev soj ntsuam zoo suav nrog kev tshuaj ntsuam xyuas tshuaj (spectroscopy), kev ntsuas kev siv tshuab (tensile, cuam tshuam, khoov), kuaj ultrasonic (rau qhov tsis xws luag), thiab kuaj pom. Cov ntawv pov thawj (MTC) tau muab los lees paub ua raws li ASTM A537 cov qauv, kom ntseeg tau cov khoom siv.
Qhov siab tshaj plaws ua haujlwm kub rau A537 Chav Kawm 2 yog dab tsi?
Nws tuaj yeem ua haujlwm ntawm qhov kub txog li 650℃F (343 degree). Nyob rau hauv tas li ntawd, lub zog yuav txo, thiab creep yuav tshwm sim. Rau qhov kub thiab txias dua, cov cua sov-resistant alloys zoo li A387 yog nyiam. Tsim kom zoo thermal tiv thaiv overheating thiab cov khoom degradation.
Puas yog A537 Class 2 magnetic?
Yog, nws yog magnetic vim nws ferritic microstructure (lub cev -centered cubic). Cov cuab yeej no tso cai rau kev tshuaj xyuas cov khoom sib nqus (MPI) rau qhov tsis xws luag, ib qho kev tsis sib xws ntawm -kev ntsuas kev puas tsuaj hauv kev tsim cov hlab ntsha siab thiab kev saib xyuas.
Dab tsi yog qhov txawv ntawm A537 Chav Kawm 2 thiab A516 Gr. 70?
A537 Chav Kawm 2 yog normalized, thaum A516 Gr. 70 yog li - dov los yog normalized. Chav Kawm 2 muaj lub zog muaj zog ntau dua (38 vs . 38 ksi, tib qhov tawm los tab sis cov kev ntsuas cuam tshuam nruj dua) thiab zoo dua qis- qhov kub thiab txias, haum rau kev thov ntau dua.
A537 Class 2 khaws cia li cas los tiv thaiv degradation?
Nws yuav tsum tau muab cia rau hauv qhov chaw qhuav, npog kom tsis txhob ya raws thiab xeb. Cov phaj yog muab tso rau ntawm cov ntoo txhawb nqa kom tso cai rau huab cua ncig, tiv thaiv kev sib cuag nrog cov chaw ntub dej. Cov yeeb yaj kiab tiv thaiv lossis roj tuaj yeem siv rau ntev - lub sijhawm khaws cia kom khaws cia zoo.
A537 Class 2 puas tuaj yeem siv rau hauv kev siv dej hiav txwv?
Yog, nws yog siv nyob rau hauv marine siab hlab ntsha, nkoj hulls, thiab offshore qauv. Nws lub zog thiab weldability haum rau marine ib puag ncig, tab sis kev tiv thaiv corrosion (xim, cathodic tiv thaiv) yog qhov tseem ceeb los tiv thaiv cov dej ntsev corrosion thiab ua kom ntev - lub sij hawm durability.
Charpy cuam tshuam lub zog xav tau rau A537 Chav Kawm 2 yog dab tsi?
Ntawm -20℃F (-29 degree), peb tus qauv yuav tsum muaj qhov nruab nrab CVN cuam tshuam lub zog ntawm 20 ft-lb (27 J), tsis muaj tus nqi qis dua 15 ft-lb (20 J). Qhov no ua kom tawv tawv kom tiv taus qhov cuam tshuam tam sim lossis qhov kub thiab txias tsis muaj qhov ua tsis tiav.
Dab tsi yog qhov txiaj ntsig - rau - tensile piv ntawm A537 Chav Kawm 2?
yield -rau-tensile ratio yog kwv yees li 0.63 (38 ksi yield / 60 ksi tensile). Qhov sib piv nruab nrab qhia tau hais tias zoo ductility thiab cia lub zog, tso cai rau cov khoom kom deform ua ntej mus txog tensile tsis ua hauj lwm, tseem ceeb heev rau kev ruaj ntseg hlab ntsha.