ASTM A537 Qib 2yog quenched thiab tempered carbon -manganese- silicon steel phaj haum rau kev siv lub nkoj siab. Siv dav hauv petrochemical thiab chaw cia khoom, nws yog siv los ua LPG tso tsheb hlau luam, roj thiab roj tso tsheb hlau luam, cov khoom sib cais thiab cov khoom siv hluav taws xob sib txawv, ua kom zoo rau cov khoom siv petrochemical, khaws cia thiab kev thauj mus los. Hauv kev lag luam hluav taws xob, nws ua haujlwm rau cov khoom tseem ceeb xws li nuclear reactor siab hlab ntsha, boiler nruas thiab hydropower siab - cov kav dej siab, nrog rau kev ua haujlwm hnyav. Nws kuj haum rau siab -siab reactors thiab industrial siab hlab ntsha, ua tau raws li hnyav-cov dej num hauv kev lag luam. Ua tsaug rau quenching thiab tempering, nws muaj cov khoom siv zoo heev, nrog rau lub zog zoo thiab ductility. Nws kuj tseem muaj qhov zoo tshaj qhov qis -kub toughness, khaws cov kev cuam tshuam siab nyob rau hauv qhov chaw cryogenic. Nrog rau kev tswj xyuas nruj nruj, nws muaj qhov zoo weldability rau loj - cov khoom tsim thiab ua raws li ASTM A537 / A537M thiab ASME SA537 cov qauv, kom ntseeg tau tias muaj kev ntseeg siab hauv cov ntawv thov tseem ceeb.
ASTM A537 Chav Kawm 2 Cov Khoom Siv Tshuaj:
| C | Mn | P | S | Si | Cr | Cu | Ni | Mo | |
| Tsawg dua los yog sib npaug li 40 mm | >40 mm | ||||||||
| 0.24 max | 0.70/1.35 | 1.00/1.60 | 0.035 | 0.035 | 0.15/0.50 | 0.025 | 0.35 | 0.25 | 0.080 |
ASME SA537 / ASTM A 537 - Chav Kawm 2 Mechanical Properties:
| Qib | Kev kho cua sov | Tensile (MPa) | Tawm tswv yim (MPa) | Elongation |
| SA537 Chav Kawm 2 | Quenched thiab tempered | 550–690 | 415 | 22% |
Thawj txoj kev tsim khoom thiab kev ua haujlwm rau A537 Chav Kawm 2 suav nrog:
1. Kev kho cua sov (Cov txheej txheem tseem ceeb)
Tsis zoo li Chav Kawm 1 (uas yog normalized), Chav Kawm 2 yog tus cwj pwm los ntawm Quenching thiab Tempering (Q&T):
quenching: Cov phaj yog rhuab mus rau qhov kub tsis sib xws (feem ntau ntawm 860-890 degree) kom ua tiav cov qauv austenitic thiab tom qab ntawd txias txias hauv dej lossis roj.
Tempering: Tom qab quenching, daim hlau rov qab rau qhov kub ntawm yam tsawg 595℃(1100℃F). Cov txheej txheem no txo cov kev ntxhov siab sab hauv thiab ua kom zoo dua qhov sib npaug ntawm lub zog siab thiab tsis muaj zog.
2. Steelmaking thiab Rolling
Refining: Txhawm rau kom muaj kev huv huv siab, cov hlau yog tsim los ntawm Electric Arc Rauv (EAF) lossis Basic Oxygen Rauv (BOF) txoj kev, ua raws li Ladle Furnace (LF) refining thiab Nqus Degassing (VD) kom txo cov sulfur, phosphorus, thiab gaseous impurities.
Rolling: Tswj dov los yog Thermo-Mechanical Controlled Processing (TMCP) feem ntau yog siv ua ntej kev kho cua sov los kho cov qauv thawj zaug.
3. Cov txheej txheem vuam
A537 Chav Kawm 2 muaj qhov zoo tshaj plaws weldability rau hnyav- daim ntawv thov:
Txoj Kev: Tsim nyog rau Shielded Hlau Arc Vuam (SMAW), Submerged Arc Vuam (SAW), thiab Gas Hlau Arc Vuam (GMAW).
Consumables: Siab-lub zog, qis-hydrogen electrodes zoo li E8018-C3 feem ntau pom zoo.
Tshaj tawm -Kev kho cua sov (PWHT): Rau cov phaj tuab, PWHT feem ntau yuav tsum tau ua kom muaj kev ncaj ncees ntawm cov qauv thiab txo qhov kev pheej hmoo ntawm hydrogen-induced cracking.
4. Txiav thiab sib sau
Txiav: CNC nplaim taws lossis Plasma txiav yog tus qauv. Koj tuaj yeem nrhiav cov ntaub ntawv ntxaws ntxaws thiab kev muaj peev xwm ua tiav los ntawm cov chaw muag khoom loj xws li Masteel UK lossis Penn Stainless.
Cold forming: Cov khoom muaj ductility zoo, tab sis nws raug nquahu kom zom cov pa roj- txiav npoo ua ntej khoov kom tshem tawm cov cua sov- thaj chaw cuam tshuam (HAZ) thiab tiv thaiv micro- tawg.
daim ntawv thov
1. Roj, Roj, thiab Petrochemical kev lag luam
A537 Chav Kawm 2 tau siv dav vim nws muaj peev xwm los daws cov corrosive thiab siab - cov kua dej siab.
Lub Hwj Chim Siab & Reactors: Tshwj xeeb loj - teev cov reactors nyob rau hauv refineries uas ua haujlwm nyob rau hauv siab heev.
Separators & Scrubbers: Qhov tseem ceeb rau kev ua cov kua dej tsis zoo hauv ob qho tib si onshore thiab offshore chaw.
2. Lub zog thiab lub zog tsim
Cov khoom siv thermal stability thiab lub zog tso cai rau siv nyob rau hauv cov tshuab nrog cov pa siab siab.
Muaj boilers: Fabrication ntawm siab - siab boilers thiab chav nruas.
Nuclear Cheebtsam: Siv nyob rau hauv pressurizers, reactor hlab ntsha, thiab nuclear chav generators.
Thaum tshav kub kub Exchangers: Cov khoom tseem ceeb hauv cov chaw tsim hluav taws xob thiab cov khoom siv tshuaj.
3. Cia thiab Logistics
Cov hlau tsis muaj zog ntawm qhov nruab nrab thiab qis qis ua rau nws zoo tagnrho rau cov khoom ntim.
LPG & LNG Cia: Kev tsim kho ntawm Liquefied Petroleum Gas (LPG) tanks.
API 650 & 620 Tank: Txheem cia tso tsheb hlau luam rau petrochemicals xav tau kev ua haujlwm siab.
Cryogenic Vessels: Tsim nyog rau cov kev pabcuam nruab nrab cryogenic uas txhim kho toughness yog qhov tseem ceeb los tiv thaiv kev tawg tawg.
4. Marine thiab Offshore Engineering
Offshore Platforms: Cov yam ntxwv ntawm cov khoom siv uas yuav tsum tau tiv taus qhov hnyav marine ib puag ncig thiab kev thauj khoom cyclic.
Sib sib zog nqus- Cov Khoom Siv Hiav Txwv: Cov ntawv thov yuav tsum muaj kev thauj khoom siab- cov kabmob muaj peev xwm thiab ua haujlwm tsis zoo rau cov kev kub ntxhov sab nraud.
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.
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 puas tuaj yeem ua tau yooj yim?
Yog lawm, nws muaj kev ua haujlwm zoo, zoo ib yam li lwm cov carbon -manganese steels. Cov cuab yeej txiav kom raug (siab- steel ceev lossis carbide) thiab cov khoom siv txias yog siv los tiv thaiv overheating. Machining tsis yuav tsum tau kho raws li phaj thickness thiab kho cua sov lub xeev.
Lub zog qaug zog ntawm A537 Chav Kawm 2 yog dab tsi?
Nws lub zog qaug zog (kev txwv tsis pub dhau) yog kwv yees li 25-30 ksi (172-207 MPa) rau kev thauj khoom tag nrho. Lub neej qaug zog nyob ntawm theem kev ntxhov siab, qhov chaw tiav, thiab vuam zoo. Tsim kom raug thiab txo kev ntxhov siab txhim kho qaug zog tiv thaiv hauv kev siv cyclic load.
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.