ASTM A387 Qib 22 Chav Kawm 1yog chromium-molybdenum (Cr-Mo) alloy steel phaj siv rau welded boilers thiab siab hlab ntsha nyob rau hauv siab kub kev pab cuam, muab zoo zog thiab corrosion kuj, nrog rau chav kawm ntawv 1 sawv cev rau tus qauv tensile zog theem rau xws li daim ntaub ntawv. Nws muaj kwv yees li 2.25% chromium thiab 1.00% molybdenum, muab kev txhim kho siab - kub lub zog thiab txhim kho corrosion kuj piv rau carbon steels, haum rau roj & roj, petrochemical, thiab fais fab kev lag luam.
Specifications rau ASTM A387 Qib 22 Alloy Steel Phaj
Chromium & Molybdenum cov ntsiab lus (raws li ASME specification)
| Lub npe | Nominal Chromium Cov ntsiab lus (%) |
Nominal Molybdenum Cov ntsiab lus (%) |
| A387 Qib 22 | 2.25% | 1.00% |
Cov Khoom Siv Tshuaj Rau ASTM A387 Qib 22 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| A387 Qib 22 | ||
| Cov pa roj carbon: | Kev Ntsuas Kub: | 0.05 - 0.15 |
| Product Analysis: | 0.04 - 0.15 | |
| 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: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Kev Ntsuas Kub: | 0.50 max |
| Product Analysis: | 0.50 max | |
| Chromium: | Kev Ntsuas Kub: | 2.00 - 2.50 |
| Product Analysis: | 1.88 - 2.62 | |
| Molybdenum: | Kev Ntsuas Kub: | 0.90 - 1.10 |
| Product Analysis: | 0.85 - 1.15 |
Sib npaug rau ASTM A387 Qib 22 Alloy Steel Phaj
| BS | EN | ASTM/ASME | DIN |
| 622-515B | 10 ZPO 910 | A387-22-1 | 10 ZPO 910 |
daim ntawv thov
1. Petrochemical & Tshuaj ua haujlwm
Siv dav hauv refineries thiab tshuaj nroj tsuag rau cov khoom siv uas yuav tsum tiv taus huab cua kub thiab tshuaj lom neeg kev ntxhov siab:
Siab -Pressure Reactors: Zoo tagnrho rau hydrogenation units thiab catalytic crackers uas ua haujlwm nyob rau hauv siab hydrogen ib feem ntawm lub siab, raws li cov ntsiab lus molybdenum txhim khu kev tiv thaiv rau siab -kub hydrogen nres (HTHA).
Separators & Storage Vessels: Kov cov xov xwm corrosive xws li roj qaub (H2S) thiab siab - siab zog. Nws cov ntsiab lus chromium (feem ntau 2.00-2.50%) muab cov txheej txheem tiv thaiv oxidation thiab tshuaj tua kab mob.
Kev nyab xeeb & Kev ntseeg tau: Cov hlau tsis kam tiv thaiv kev ntxhov siab corrosion tawg thiab pitting ua kom lub sij hawm ntev - kev nyab xeeb ntawm cov dej thauj tshuab.
2. Kev tsim hluav taws xob
Cov khoom siv tseem ceeb rau kev lag luam hluav taws xob, tshwj xeeb hauv cov roj fossil thiab nuclear fais fab chaw nres tsheb:
Boiler Drums & Superheater Tubes: Muaj peev xwm tuav tau siab -siab chav thiab txuas mus rau qhov kub txog li 600 degree.
Cov Cheebtsam ntawm lub cub tawg: Nws cov txheej txheem ua haujlwm tau zoo tso cai rau nws los tiv thaiv thermal cycling (rov ua cua sov thiab txias) yam tsis muaj qhov cuam tshuam loj heev los yog scaling.
System Integrity: Siv nyob rau hauv lub siab Cheebtsam los txo tus nqi txij nkawm thiab tiv thaiv downtime nyob rau hauv xav tau lub zog tsim ib puag ncig.
3. Cov khoom siv roj & roj
Siv rau hauv ob qho tib si offshore thiab onshore cov chaw rau kev tuav cov dej tseem ceeb:
Siab -Pressure Piping: Siv rau cov kav dej thiab cov kav dej sib txuas uas thauj cov khoom tsis zoo los yog corrosive nyob rau hauv siab heev.
Cov Khoom Siv Ua Haujlwm: Siv rau kev ua haujlwm siab - cov tshuab ua haujlwm thiab cov thawv tshwj xeeb uas yuav tsum tau muaj kev ruaj ntseg hauv qhov hnyav, siab - qhov kub thiab txias.
4. Muaj cua sov Exchangers
Qhov tseem ceeb rau kev hloov hluav taws xob uas qhov kev ruaj ntseg yog qhov tseem ceeb:
Thermal Stability: Ua haujlwm zoo ntawm qhov kub txog 600℃(1112℃F) thaum tuav nws cov duab thiab lub zog txhua yam dhau ntau txhiab lub sijhawm ua haujlwm.
Oxidation Resistance: Siab kub kam rau siab tiv thaiv kev tsim cov nplai ntawm qhov chaw, ua kom muaj kev hloov pauv tau zoo thiab tiv thaiv qhov degradation.
Fabrication: Class 1's superior ductility thiab weldability ua rau nws zoo tagnrho rau cov complex geometries xav tau nyob rau hauv kev cai tshav kub exchanger thiab condenser tsim.
Yog tias koj xav paub ntxiv txog (ASTM A387 Qib 22 Chav Kawm 1) GNEE cov khoom, koj tuaj yeem xa email rau beam@gneesteelgroup.com. Peb zoo siab tshaj los pab koj.
Dab tsi yog qhov txawv ntawm ASTM a387 GRADE 22 CLASS 1 thiab Class 2?
ASTM A387 Qib 22 Chav Kawm 1 thiab Chav Kawm 2 yog chromium-molybdenum alloy steel daim hlau rau cov hlab ntsha siab nrog cov tshuaj muaj pes tsawg leeg; lawv qhov sib txawv tseem ceeb nyob hauv cov khoom siv kho tshuab-Class 2 muaj zog tensile thiab tawm los ntau dua li Class 1, uas tshwm sim los ntawm kev kho cua sov sib txawv (normalizing + tempering rau Chav Kawm 1, quenching + tempering rau Chav Kawm 2). Yog li ntawd, Chav Kawm 1 muaj qhov zoo dua weldability thiab formability rau qis - kev ntxhov siab ntawm lub nkoj, thaum Chav Kawm 2 haum rau siab - kev ntxhov siab, siab - kub thiab siab - cov ntawv thov siab txawm tias yuav tsum tau ua kom nruj dua.
ASTM A387 yog dab tsi?
Lub siab zoo chrome molybdenum alloy steel phaj npaj tshwj xeeb rau kev siv hauv weldable carbon steel siab hlab ntsha ntawm qhov kub siab. Ntxiv molybdenum muab cov khoom siv kub tensile zog thiab chromium muab kev txhim kho corrosion.