SA 387 Qib 12 Chav Kawm 2yog ib qho chromium-molybdenum alloy steel phaj tau teev tseg raws li ASME SA 387 tus qauv, feem ntau yog tsim los siv rau hauv siab -kev pabcuam kub hauv cov hlab ntsha thiab cov ntawv siv boiler. Nrog rau qhov nominal muaj pes tsawg leeg uas muaj chromium thiab molybdenum, qib no muaj kev nkag siab zoo, siab - kub lub zog, thiab oxidation tsis kam, ua rau nws haum rau cov khoom ua haujlwm ntawm qhov kub txog li 900℃F (482℃). Chav Kawm 2 qhia txog kev kho cua sov zoo li qub thiab tempered, uas muab kev txhim kho toughness thiab ductility piv rau Chav Kawm 1. SA 387 Qib 12 Chav Kawm 2 feem ntau yog siv rau hauv refineries, petrochemical nroj tsuag, cov chaw tsim hluav taws xob, thiab lwm yam kev lag luam uas txhim khu kev qha nyob rau hauv qhov kub thiab siab siab.
Sib npaug
| BS | EN | ASTM / ASME Cov | DIN |
| 620 B | 13 ZPO 45 | SA387-12-2 | 13 ZPO 44 |
Specifications rau ASME SA387 Qib 12 Alloy Steel Phaj
| Lub npe | Nominal Chromium Cov ntsiab lus (%) |
Nominal Molybdenum Cov ntsiab lus (%) |
| SA387 Qib 12 | 1.00% | 0.50% |
Tensile Requirements rau ASME SA387 Qib 12 Alloy Steel Phaj Chav Kawm 2
| Lub npe: | Yuav tsum tau: | Qib 12 |
| SA387 Qib 12 | Tensile zog, ksi [MPA] | 65 txog 85 [450 rau 585] |
| Yield zog, min, ksi [MPa] / (0.2% offset) | 40 [275] | |
| Elongation hauv 8 nti. [200mm], min % | 19 | |
| Elongation hauv 2 nti. [50mm], min, % | 22 | |
| Txo thaj tsam, min% | ––– |
Cov Khoom Siv Tshuaj Rau ASME SA387 Qib 12 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| ASME SA387 Qib 12 | ||
| Cov pa roj carbon: | Kev Ntsuas Kub: | 0.05 - 0.17 |
| Product Analysis: | 0.04 - 0.17 | |
| Manganese: | Kev Ntsuas Kub: | 0.40 - 0.65 |
| Product Analysis: | 0.35 - 0.73 | |
| Phosphorus: | Kev Ntsuas Kub: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulfur (max): | Kev Ntsuas Kub: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Kev Ntsuas Kub: | 0.15 - 0.40 |
| Product Analysis: | 0.13 - 0.45 | |
| Chromium: | Kev Ntsuas Kub: | 0.80 - 1.15 |
| Product Analysis: | 0.74 - 1.21 | |
| Molybdenum: | Kev Ntsuas Kub: | 0.45 - 0.60 |
| Product Analysis: | 0.40 - 0.65 |
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Cov txheej txheem tseem ceeb & Kev tsim khoom
Txoj kev tsim khoom: Cov phaj feem ntau yog Kub-Rolled (HR). Kev tsim khoom suav nrog khoos phis tawj- tswj kev ua kom tau raws li cov neeg siv khoom tshwj xeeb.
Kev kho cua sov: Yuav kom ua tiav qhov "Class 2" cov khoom siv kho tshuab, cov hlau yuav tsum tau txais kev kho cua sov, feem ntau muaj xws li normalization thiab tempering lossis quenching thiab tempering. Qhov tsawg kawg nkaus tempering kub rau Qib 12 yog 1150℃F.
Cov txheej txheem txiav: cov kev pom zoo muaj xws li ntshav, dej- dav hlau, lossis nplaim taws txiav. Rau cov nplaim taws lossis ntshav txiav, preheating cov khoom feem ntau yog tsim nyog los tiv thaiv kev tawg.
Fabrication & Vuam
Weldability: Cov khoom siv tau zoo weldability, uas yog qhov tseem ceeb rau kev tsim cov hlab ntsha nyuaj.
Cov txheej txheem vuam: Cov txheej txheem muaj xws li Shielded Hlau Arc Vuam (SMAW), Gas Tungsten Arc Vuam (GTAW/TIG), thiab Submerged Arc Vuam (SAW).
Cov ntaub ntawv muab tub lim: Cov khoom siv tau zoo suav nrog E8018-B2 (SMAW) thiab ER80S-B2 (GTAW/GMAW).
Post-Kev ua: Preheating ua ntej welding yog pom zoo kom tsis txhob txias tawg, ua raws li Post-Weld Heat Treatment (PWHT) kom ruaj khov.
Mechanical Properties (Class 2)
Kev ua haujlwm yuav tsum ua kom cov khoom ua tau raws li qhov yuav tsum tau muaj zog dua ntawm Chav Kawm 2 piv rau Chav Kawm 1:
| Khoom | Tus nqi |
|---|---|
| Tensile zog | 450 - 585 MPa (kwv yees . 65 - 85 ksi) |
| Yield zog | 275 MPa yam tsawg kawg nkaus (kwv yees . 40 ksi) |
| Elongation | 20% yam tsawg kawg nkaus (hauv 2 nti) |
Standard Test thaum lub sij hawm ua
Txhawm rau kom ntseeg tau tias muaj kev ntseeg siab hauv siab - ib puag ncig siab, cov kev sim hauv qab no yog tus qauv:
Tsis yog-Kev Ntsuas Kev Ua Phem: Kev kuaj Ultrasonic, Radiography (X-}ray), thiab kuaj cov khoom sib nqus.
Mechanical Testing: Impact testing (feem ntau mus rau -52 degree), Hardness, thiab Charpy tests.
Corrosion Testing: Intergranular corrosion (IGC) thiab Positive Material Identification (PMI) los txheeb xyuas cov tshuaj muaj pes tsawg leeg.
Core Industrial Applications
Roj & Gas thiab Petrochemical:Siv dav rau fabricatingcov hlab ntsha separator, cov khoom siv refinery, thiab cov tank cia rau siab - cov pa roj. Nws tiv taus oxidation ua rau nws tus qauv rauqaub kev pab cuam(ib puag ncig uas muaj 𝐻2𝑆)
Kev tsim hluav taws xob:Qhov tseem ceeb raumuaj boilers, boiler nruas, thiab cua sov rov qab chav generators (HRSG). Nws kuj tseem pom muaj nyob rau hauv lub tshuab hluav taws xob hluav taws xob nuclear siab thiab siab - qhov kub thiab txias ducting.
Cov khoom siv cua sov:Feem ntau siv hauv kev tsim khoomkub exchangers, condensers, thiab superheaters vim nws thermal stability.
Kev Siv Tshuaj:Siv rau cov reactors thiab cov hlab ntsha tsim los tswj cov xov xwm corrosive ntawm qhov kub thiab txias.
Component Fabrication
Tshaj li cov hlab ntsha loj, qib no tau ua tiav rau hauv cov khoom tshwj xeeb:
Piping Systems:Chav kav dej, siab - qhov kub thiab txias, thiab loj - txoj kab uas hla cov yeeb nkab ua haujlwm.
Fittings:Flanges, li qub, yeeb nkab clamps, thiab kev txhawb nqa tsim los rau siab - ib puag ncig kev ntxhov siab.
Kev lag luam dav dav:High -kub cia tank, oxygen cylinders, thiab liners rau chutes los yog bins.
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.
Yam khoom tseem ceeb ntawm SA 387 Qib 12 Chav Kawm 2 yog dab tsi?
Nws yog qis- alloy chromium-molybdenum steel. Tsim los rau siab - kub thiab siab daim ntawv thov, nws muaj kev nkag tau zoo heev thiab kev ruaj ntseg hauv cov chaw ua haujlwm hnyav.
Tus qauv twg qhia SA 387 Qib 12 Chav Kawm 2?
Nws tau teev tseg los ntawm ASTM A387 tus qauv, uas npog cov hlau hlau phaj rau welded boilers thiab cov hlab ntsha siab. Cov txheej txheem no txhais nws cov tshuaj muaj pes tsawg leeg thiab cov khoom siv kho tshuab.
Dab tsi yog cov ntsiab lus carbon cov ntsiab lus ntawm cov khoom no?
Nws cov ntsiab lus carbon yog li ntawm 0.15% txog 0.20%. Qhov ntau yam no sib npaug hardness thiab weldability, ua rau nws haum rau fabrication ntawm siab-muaj cov khoom.
Cov ntsiab lus chromium dab tsi yog SA 387 Qib 12 Chav Kawm 2 muaj?
Nws muaj 0.80% mus rau 1.15% chromium. Chromium txhim kho corrosion kuj thiab oxidation tsis kam, tseem ceeb heev rau siab - kub kev pab cuam tej yam kev mob.
Cov ntsiab lus molybdenum ntawm qib no yog dab tsi?
Cov ntsiab lus molybdenum yog 0.45% txog 0.60%. Molybdenum txhim kho kev nkag siab lub zog thiab kub ua haujlwm, ua kom siv tau rau hauv kev ua haujlwm siab - kub.
Qhov tsawg kawg nkaus tensile lub zog ntawm SA 387 Qib 12 Chav Kawm 2 yog dab tsi?
Nws lub zog tensile yam tsawg kawg nkaus yog 415 MPa (60,000 psi). Qhov no ua kom muaj peev xwm txaus txaus-cov kabmob muaj peev xwm rau lub nkoj siab thiab cov ntawv siv boiler.
Qhov tsawg kawg nkaus tawm lub zog ntawm cov khoom no yog dab tsi?
Qhov tsawg kawg nkaus tawm lub zog yog 205 MPa (30,000 psi). Nws muab cov ductility zoo thiab cov qauv kev ntseeg siab nyob rau hauv siab -siab thiab kub hloov pauv.
Qhov ntsuas kub npaum li cas yog SA 387 Qib 12 Chav Kawm 2 haum rau?
Nws ua tau zoo ntawm -29℃(-20℃F) thiab 593℃(1100℃F). Tshaj li qhov ntau, nws cov khoom siv kho tshuab tuaj yeem degrade loj.
Puas yog SA 387 Qib 12 Chav Kawm 2 weldable?
Yog, nws yog yooj yim weldable nrog cov txheej txheem kom raug. Preheating thiab post-weld kho cua sov yog pom zoo kom tsis txhob txias cracking thiab txo qhov seem seem.
Qhov kub preheating dab tsi yog pom zoo rau vuam cov khoom no?
Qhov pom zoo preheating kub yog 150℃rau 200℃(302℃F txog 392℃F). Qhov no tiv thaiv hydrogen-induced cracking thaum lub sij hawm thiab tom qab vuam.