SA 387 Qib 5 Chav Kawm 2yog chromium-molybdenum alloy steel phaj, ua raws li ASTM / ASME cov qauv, tsim los rau cov hlab ntsha siab thiab cov boilers siv nyob rau hauv siab - kub kev pab cuam, muab zoo heev corrosion kuj thiab lub zog ntawm high kub vim nws cov ntsiab lus chromium thiab molybdenum. Nws yog cov khoom siv zoo - zoo, ruaj khov siv dav hauv cov roj, roj, tshuaj lom neeg, thiab hluav taws xob tsim kev lag luam rau cov khoom siv xws li cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, thiab cov tso tsheb hlau luam.
Sib npaug
| BS | EN | ASME | DIN |
| ... | ... | SA387-5-2 | ... |
Specifications ASME SA387 Qib 5 Alloy Steel Phaj
| Lub npe | Nominal Chromium Cov ntsiab lus (%) |
Nominal Molybdenum Cov ntsiab lus (%) |
| SA387 Qib 5 | 5.00% | 0.50% |
Tensile Requirements rau ASME SA387 Qib 5 Alloy Steel Phaj Chav Kawm 2 Phaj
| Lub npe: | Yuav tsum tau: | Qib 5 |
|
SA387 Qib 5 |
Tensile zog, ksi [MPA] | 75 txog 100 [515 rau 690] |
| Yield zog, min, ksi [MPa] / (0.2% offset) | 45 [310] | |
| Elongation hauv 8 nti. [200mm], min % | ... | |
| Elongation hauv 2 nti. [50mm], min, % | 18 | |
| Txo thaj tsam, min% | 45 ( ntsuas ntawm cov qauv puag ncig) 40 ( ntsuas ntawm cov qauv tiaj tus) |
Cov Khoom Siv Tshuaj Rau ASME SA387 Qib 5 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| SA 387 Qib 5 | ||
| Cov pa roj carbon: | Kev Ntsuas Kub: | 0.15 max |
| Product Analysis: | 0.15 max | |
| Manganese: | Kev Ntsuas Kub: | 0.30 - 0.60 |
| Product Analysis: | 0.25 - 0.66 | |
| Phosphorus: | Kev Ntsuas Kub: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulfur (max): | Kev Ntsuas Kub: | 0.030 |
| Product Analysis: | 0.030 | |
| Silicon: | Kev Ntsuas Kub: | 0.50 max |
| Product Analysis: | 0.55 max | |
| Chromium: | Kev Ntsuas Kub: | 4.00 - 6.00 |
| Product Analysis: | 3.90 - 6.10 | |
| Molybdenum: | Kev Ntsuas Kub: | 0.45 - 0.65 |
| Product Analysis: | 0.40 - 0.70 |
SA 387 Qib 5 Chav Kawm 2yog ib qho chromium-molybdenum alloy steel phaj (5% Cr, 0.5% Mo) tshwj xeeb tsim los rau siab - kub siab cov hlab ntsha thiab boilers. Muab nws cov ntsiab lus siab alloy, kev ua haujlwm yuav tsum nruj me ntsis ua raws li ASME Tshooj II, Tshooj A cov lus qhia.
1. Cov txheej txheem kho cua sov
Kev kho cua sov yog qhov tseem ceeb rau kev ua tiav cov khoom siv kho tshuab uas xav tau rau Chav Kawm 2.
Kev Xa Khoom: Feem ntau muab nyob rau hauv Annealed lossis Normalized thiab Tempered (N + T) mob.
Normalizing: Cua sov rau kwv yees li 900-950℃(1650-1740℃F) los kho cov qauv nplej.
Tempering: Tus qauv tswj hwm qhov kub ntawm qhov tsawg kawg nkaus ntawm 705℃(1300℃F) kom ntseeg tau tias ductility thiab toughness tom qab hardening los ntawm chromium.
Accelerated Cooling: Ua kua quenching lossis yuam cua txias yog tso cai ua raws li tempering los txhim kho cov khoom siv tshwj xeeb.
2. Vuam txheej txheem (WPS)
Cov ntsiab lus 5% Cr ua rau cov khoom ua rau huab cua- khov thiab txias tawg.
Preheating: Qhov tseem ceeb los tiv thaiv hydrogen-induced cracking (HIC). Rau Chav Kawm 2, preheating feem ntau yuav tsum muaj tsawg kawg yog 150℃txog 200℃(300℃F txog 400℃F) nyob ntawm thickness.
Interpass Kub: Yuav tsum tau tswj nruj me ntsis, feem ntau khaws cia nyob rau tib theem raws li qhov kub ntawm preheat.
Tshaj tawm -Kev Kho Hniav Kub Kub (PWHT): Yuav tsum tau txo qhov tawv nqaij hauv Heat Afected Zone (HAZ) thiab txo cov kev ntxhov siab uas seem. Hom PWHT kub ntau yog 705℃txog 760℃(1300℃F txog 1400℃F).
3. Mechanical Property Requirements (2026 Standards)
Qhov kev xaiv "Class 2" txhais tau tias yuav tsum muaj zog ntau dua piv rau Chav Kawm 1:
Tensile zog: 75-100 ksi [515-690 MPa].
Tawm Zog: Tsawg kawg 45 ksi [310 MPa].
Elongation: Tsawg kawg 18% (hauv 2 ntiv tes).
4. Cov ntawv sau tseem ceeb
Cold/Hot forming: Yog tias qhov kub sib sau ua tiav, cov khoom yuav tsum tau ua kom tiav tag nrho re-kev kho cua sov (Normalizing thiab Tempering) los kho nws cov khoom tsim.
Corrosion Resistance: 5% Chromium muab kev tiv thaiv zoo heev rau oxidation thiab sulfidation hauv refinery ib puag ncig ntawm qhov kub txog li 600 degree.
daim ntawv thov
1. Roj, Roj, thiab Petrochemical kev lag luam
Qhov no yog thawj qhov chaw rau SA 387 Qib 5. Nws yog siv rau cov khoom siv uas ua haujlwm corrosive hydrocarbons ntawm qhov kub thiab txias:
Hydrocracking thiab Hydrotreating Units: Tshwj xeeb hauv cov reactors thiab cov khoom sib cais qhov uas tiv taus siab -kub hydrogen nres yog tsim nyog.
Refinery Process Vessels: suav nrog cov kab distillation thiab fractionation yees.
Kub Exchangers thiab Condenser: tuav cov xov xwm nruj heev thiab siab -siab zog.
Sour Service Ib puag ncig: Siv nyob rau hauv ib puag ncig uas muaj 𝐻2𝑆 vim nws txhim kho oxidation thiab sulfidation kuj.
2. Kev tsim hluav taws xob
Hauv cov chaw tsim hluav taws xob, qib no raug xaiv rau nws qhov siab - kub tensile lub zog thiab nkag siab tsis kam:
Muaj Boilers thiab Chav Generators: Siv rau boiler nruas thiab cov kav dej uas yuav tsum muaj kev ruaj ntseg zoo nyob rau hauv lub sij hawm thermal stress.
Fais fab nroj tsuag Superheaters: Cheebtsam raug rau huab cua kub heev.
Nuclear fais fab kev lag luam: Siv nyob rau hauv ib qho tshwj xeeb theem nrab-sab siab hlab ntsha uas txwv corrosion thiab siab kub yog kev txhawj xeeb.
3. Tshuaj thiab hnyav ua haujlwm
Chemical Storage Tanks: Txhawm rau tuav ntau yam tshuaj uas yuav tsum tau ua kom sov kom nyob twj ywm hauv cov kua lossis gaseous.
Pharmaceutical Reactors: Siv nyob rau hauv cov txheej txheem siab -siab synthesis.
Pulp thiab Ntawv Kev Lag Luam: Cheebtsam rau cov digesters thiab lwm yam siab -cov khoom ua haujlwm kub.
4. Cov cuab yeej siv tshwj xeeb
Liners thiab hnav daim phiaj: Rau chutes, bins, thiab tsheb thauj khoom lub cev nyob rau hauv mining los yog hnyav kev tsim kho uas ua hauj lwm nyob rau hauv siab - cua sov puag ncig.
Ducting thiab Yeeb Nkab Txhawb: Nyob rau hauv siab -kub tso cua tshuab.
Cov Khoom Siv Rauv: Pins, shafts, thiab conveyors siv nyob rau hauv industrial furnaces.
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 twg yog SA 387 Qib 5 Chav Kawm 2?
SA 387 Qib 5 Chav Kawm 2 yog qis- alloy chromium-molybdenum (Cr-Mo) steel phaj, feem ntau yog tsim los rau siab - kub thiab siab siv.
Dab tsi yog cov ntsiab lus tseem ceeb hauv SA 387 Qib 5 Chav Kawm 2 thiab lawv cov kev sib txawv li cas?
Lub ntsiab alloying ntsiab yog chromium (Cr: 1.00-1.50%) thiab molybdenum (Mo: 0.45-0.65%). Nws kuj tseem muaj cov pa roj carbon (C: max 0.18%), manganese (Mn: 0.40-0.70%), silicon (Si: 0.15-0.40%), thiab cov lej ntawm phosphorus (P) thiab sulfur (S) (txhua max 0.035%).
Tus qauv twg qhia SA 387 Qib 5 Chav Kawm 2?
SA 387 Qib 5 Chav Kawm 2 tau teev tseg los ntawm American Society of Mechanical Engineers (ASME) Boiler thiab Pressure Vessel Code (BPVC), tshwj xeeb hauv Tshooj II, Ntu A (Cov Khoom Siv Hluav Taws Xob).
Qhov kev pabcuam kub siab tshaj plaws rau SA 387 Qib 5 Chav Kawm 2 yog dab tsi?
Qhov siab tshaj plaws kev pabcuam kub kub rau SA 387 Qib 5 Chav Kawm 2 yog kwv yees li 593℃(1100℃F), ua rau nws haum rau siab -kub muaj kev lag luam ib puag ncig.
Kev kho cua sov dab tsi feem ntau xav tau rau SA 387 Qib 5 Chav Kawm 2?
Cov txheej txheem kev kho cua sov rau SA 387 Qib 5 Chav Kawm 2 suav nrog kev ua kom zoo (cua sov rau 899-954℃/ 1650-1750℃F, ua raws li cov cua txias) thiab tempering (cua sov rau 593-704℃/ 1100-1300℃F, ces txias).
Dab tsi yog cov khoom siv kho tshuab ntawm SA 387 Qib 5 Chav Kawm 2 tom qab kev kho cua sov?
Qhov tsawg kawg nkaus yield zog yog 207 MPa (30,000 psi), qhov tsawg kawg nkaus tensile lub zog yog 414 MPa (60,000 psi), thiab qhov tsawg kawg nkaus elongation ntawm tawg yog 22% (hauv 50 mm / 2 nti).
Hauv kev lag luam twg yog SA 387 Qib 5 Chav Kawm 2 nquag siv?
Nws yog dav siv nyob rau hauv cov roj thiab roj, petrochemical, lub zog tsim (boilers, turbines), thiab tshuaj ua lag luam, tshwj xeeb tshaj yog rau cov hlab ntsha siab, reactors, tshav kub exchangers, thiab piping Cheebtsam.
Qhov txawv ntawm SA 387 Qib 5 Chav Kawm 1 thiab Chav Kawm 2 yog dab tsi?
The main difference lies in thickness and heat treatment requirements. Class 2 is intended for thicker plates (usually above a certain thickness, e.g., >10 hli) thiab xav tau kev kho cua sov ntau dua (normalizing + tempering) kom ntseeg tau tias cov khoom siv kho tshuab tsis sib xws, thaum Chav Kawm 1 yuav muaj kev kho cua sov yooj yim rau cov ntu nyias.
Puas yog SA 387 Qib 5 Chav Kawm 2 weldable? Yog tias muaj, yam khoom siv vuam siv tau pom zoo?
Yog, nws yog weldable. Kev pom zoo welding consumables muaj xws li E7018-B2 (rau shielded hlau arc vuam, SMAW), ER80S-B2 (rau gas hlau arc vuam, GMAW), thiab E8018-B2 (rau flux-cored arc welding), uas muaj qhov sib txawv ntawm qhov kub thiab txias. zog.
Cov kev ntsuam xyuas zoo li cas feem ntau ua rau ntawm SA 387 Qib 5 Chav Kawm 2 daim phiaj?
Cov kev ntsuam xyuas muaj xws li tshuaj lom neeg muaj pes tsawg leeg tsom xam (ntawm spectroscopy), kev ntsuam xyuas cov cuab yeej cuab tam (tensile, yield, elongation, impact), ultrasonic test (UT) rau sab hauv, thiab kev soj ntsuam pom (VI) rau saum npoo zoo. Rau cov ntawv thov tseem ceeb, kev sim hardness thiab kev kuaj metallographic kuj yuav tsum tau.