ASTM A537 Qib 1yog cov cua sov- kho, carbon-manganese- silicon steel phaj rau kev siv lub nkoj siab. Nws raug quenching thiab tempering kom ua tiav cov khoom siv kho tshuab, haum rau nruab nrab mus rau siab - qhov kub thiab txias kev pabcuam nrog zoo weldability thiab toughness.
CHEMICAL PROPERTIES
| % | Cov pa roj carbon | Manganese | Phosphorus | Silicon | Sulfur | Chromium | Molybdenum | Nickel | Tooj |
|---|---|---|---|---|---|---|---|---|---|
| min. | - | 0.70 | - | 0.15 | - | - | - | - | - |
| max. | 0.24 | 1.35 | 0.035 | 0.50 | 0.035 | 0.025 | 0.080 | 0.25 | 0.35 |
MECHANICAL PROPERTIES
| Thickness Ntau | Yield zog (min) | Tensile zog (min) | Tensile zog (max) | Elongation (min) |
|---|---|---|---|---|
| mus txog 2 1/2" [65mm] | 50 ksi [345 MPa] | 70 ksi [485 MPa] | 90 ksi [620 MPa] | 22% |
| 2 1/2" [65mm] mus rau 4" [100mm] | 55 ksi [310 MPa] | 65 ksi [450 MPa] | 85 ksi [585 MPa] | 22% |
Kev khiav dej num
Melting thiab Refining
• Cov hlau tua tag nrho (ua tiav deoxidation).
• Fine austenitic grain loj ib ASTM A20/A20M.
• Tswj nruj ntawm C (max 0.24%), Mn (0.70–1.60%), Si (0.15–0.50%).
Normalizing Kev kho cua sov
• Thaum tshav kub kub sib npaug siab dua Ac₃ kub.
• Txias hauv huab cua los yog cua txias.
• Lub Hom Phiaj: Txhim kho microstructure, ua tiav ntau dua lossis sib npaug ntawm 50 ksi (345 MPa) tawm lub zog, thiab txhim kho toughness.
Txiav thiab Deg Kev Npaj
• Plasma lossis oxy- txiav roj.
• Tshem tawm cov txheej tawv tawv lossis HAZ los ntawm kev sib tsoo / tshuab ua ntej vuam lossis sib sau.
tsim
• Cov txheej txheem txias yog qhov zoo dua vim yog qhov zoo ductility; ua raws li qhov tsawg kawg nkaus khoov radii.
• Yog tias qhov kub ua kom siab tshaj 1100℃F (595 degree), yuav tsum rov ua dua - normalization kom rov qab tau Class 1 zog.
Vuam
• Tag nrho cov txheej txheem fusion vuam siv tau (SMAW, GMAW, SAW).
• Siv cov khoom siv hluav taws xob tsawg- los tiv thaiv qhov txias txias.
• Siv qhov yuav tsum tau ua kom sov thiab sib cuam tshuam ntawm ib qhov tuab thiab cov lej (xws li ASME IX).
Tshaj tawm -Kev kho cua sov (PWHT)
• Feem ntau kev ntxhov siab ntawm 1100–1250℃F (595–675℃).
• Tsis txhob tshaj qhov kub thiab txias kom tsis txhob muaj zog.
Kev tshuaj xyuas thiab kuaj
• Kev ntsuam xyuas nruj (YS, UTS, elongation).
• Charpy V-qhov ntsuas qhov cuam tshuam yog qhov qis- qhov ntsuas kub yuav tsum tau ua.• Ultrasonic Testing (UT) rau lub suab sab hauv.
Daim ntawv thov
Roj & Roj:Fabrication ntawm cov hlab ntsha siab, cov khoom sib cais rau cov pa roj qaub, thiab cov khoom siv hluav taws xob.
Cia Tank:Siv rau API 650 thiab API 620 qis- qhov kub thiab txias cia tso tsheb hlau luam thiab spheres siab.
Kev tsim hluav taws xob:Kev tsim cov boiler nruas, superheaters, thiab siab - siab zog piping.
Petrochemical:Reactors thiab ntim cov hlab ntsha rau kev ua cov tshuaj xws li ammonia thiab chlorine.
Qhov zoo
Siab zog:Muab lub zog tawm los ntau dua (min 50 ksi) piv rau tus qauv A516, tso cai rau cov phab ntsa nyias thiab txo qhov hnyav tag nrho.
Superior Toughness:CovnormalizedCov qauv nplej muab kev tiv thaiv zoo heev rau cov pob txha tawg nyob rau hauv siab - siab loads.
Tsawg-Tub kub Reliability:Tshwj xeeb tsim kho kom muaj kev ncaj ncees nyob rau hauv cov huab cua txias thiab sub- xoom kev pabcuam (txog -46℃).
Weldability zoo heev:Nws cov chemistry tau ua kom zoo rau cov txheej txheem vuam txheej txheem, kom ntseeg tau siab - cov pob qij txha zoo thiab tsim tau yooj yim dua.
Tau txais cov lus muaj nuj nqis rau ASTM A537 Chav Kawm 1, Hu rau GNEE Steel.
Puas yog ASTM A537 Class 1 weldable?
Yog, nws muaj zoo weldability. Preheating thiab post-weld heat treatment (PWHT) raug pom zoo kom tiv thaiv kom txhob mob khaub thuas thiab txo cov kev ntxhov siab, tshwj xeeb tshaj yog rau cov ntu tuab lossis cov kev pabcuam hnyav.
Yam tshuaj muaj pes tsawg leeg yog dab tsi?
Nws muaj 0.18-0.28% carbon, 1.00-1.60% manganese, 0.15-0.35% silicon, Tsawg dua los yog sib npaug rau 0.035% phosphorus, Tsawg dua los yog sib npaug rau 0.035% sulfur, thiab cov kab ntawm lwm cov ntsiab lus, ntsuas lub zog thiab muaj zog.
Qhov ntsuas kub npaum li cas nws haum rau?
Nws ua tau zoo ntawm -20℃F (-29 degree) txog 650℃F (343℃). Tshaj li qhov no, nws cov khoom siv kho tshuab tuaj yeem degrade, yog li nws tsis pom zoo rau qhov kev pabcuam siab lossis kub qis yam tsis muaj kev ntsuas.
Dab tsi yog cov ntawv thov ntawm ASTM A537 Class 1?
Cov kev siv feem ntau suav nrog cov hlab ntsha siab, boilers, cov tso tsheb hlau luam, thiab cov khoom siv hauv cov roj, roj, petrochemical, thiab hluav taws xob tsim kev lag luam, qhov chaw siab thiab nruab nrab kub kuj tseem ceeb heev.
Nws puas yuav tsum tau kuaj xyuas?
Yog lawm, Charpy V-kev ntsuas qhov cuam tshuam yog qhov yuav tsum tau ua. Ntawm -20℃F (-29 degree), qhov tsawg kawg nkaus absorbed zog yog 20 ft-lb (27 J) rau cov qauv, kom muaj zog txaus los tiv thaiv nkig tawg.
Dab tsi yog qhov txawv ntawm Chav Kawm 1 thiab Chav Kawm 2 ntawm ASTM A537?
Chav Kawm 2 muaj lub zog ntau dua (min. tensile 70 ksi / 483 MPa, yield 50 ksi / 345 MPa) dua li Chav Kawm 1, ua tiav los ntawm kev kho cua sov kom nruj dua. Chav Kawm 1 yog rau kev pabcuam siab dav dav, Chav Kawm 2 rau siab dua -load daim ntawv thov.
ASTM A537 Class 1 puas tuaj yeem siv rau hauv cov kev pabcuam cryogenic?
Tsis yog, nws qhov kev pabcuam kub tsawg kawg yog -20 ° F (-29 ° C). Rau kev siv cryogenic hauv qab no, cov ntaub ntawv zoo li ASTM A516 Gr. 70 nrog cov ntsuas kub qis lossis cov hlau alloy yog qhov tsim nyog dua.
Cov qauv dab tsi tau tshaj ASTM A537 Class 1?
Nws ua raws li ASME Boiler thiab Pressure Vessel Code (Section VIII) rau kev tsim lub nkoj siab. Nws kuj tau sib xws nrog AWS D1.1 rau cov txheej txheem vuam, ua kom muaj kev ua raws li cov ntawv thov kev lag luam.
Dab tsi ntawm qhov chaw tiav yuav tsum tau ua?
Qhov saum npoo yuav tsum tsis muaj qhov tsis xws luag xws li tawg, khawb, lossis nplai uas cuam tshuam rau kev ncaj ncees. Ib qho kev ua tiav zoo dua, nrog rau cov kev tsis zoo kho raws li tus qauv tshwj xeeb los tswj kev ua haujlwm.
Cov khoom raug tshuaj xyuas li cas?
Kev tshuaj ntsuam xyuas suav nrog kev tshuaj xyuas tshuaj, kev ntsuas kev siv tshuab (tensile, khoov, cuam tshuam), thiab tsis yog-kev kuaj kev puas tsuaj (NDT) zoo li kev kuaj ultrasonic txhawm rau txheeb xyuas qhov tsis zoo, xyuas kom ua raws li ASTM A537 cov cai.
Dab tsi yog qhov yuav tsum tau elongation?
Qhov tsawg kawg nkaus elongation yog 22% rau 2-nti (50.8 mm) gage length specimens. Qhov no ua kom cov ductility txaus rau deform yam tsis muaj kev puas tsuaj hauv kev thauj khoom, yog ib qho khoom tseem ceeb rau kev nyab xeeb ntawm lub nkoj.
Nws puas tuaj yeem tsim txias?
Kev ua kom txias txias yog ua tau, tab sis nws tuaj yeem txo qhov tawv. Tom qab- kev kho cua sov yog qhia kom rov kho cov khoom siv kho tshuab, tshwj xeeb tshaj yog rau cov duab nyuaj lossis hnyav deformation kom tsis txhob muaj kev ntxhov siab.