ASTM A387 Qib 5 Qib 1 Hlau
A387 Qib 5 Chav Kawm 1yog ib qho chromium-molybdenum alloy steel phaj tsim los rau siab -kub siab lub nkoj kev pabcuam. Nws yog qib qis dua piv rau Qib 11, 12, thiab 22.
Alloy Composition:Nws cov yam ntxwv tseem ceeb yog cov ntsiab lus chromium ntau dua -kwv yees li 5% Chromium nrog txog 0.5% Molybdenum. Qhov kev sib xyaw no tseem ceeb tshaj plaws oxidation thiab corrosion kuj nyob rau hauv sulfurous thiab lwm yam aggressive ib puag ncig ntawm qhov kub thiab txias tshaj lub zog siab heev.
Kev kho cua sov (Class 1):Qhov kev xaiv "Class 1" qhia tias lub phaj tau muab rau hauv qhov qub lossis kev ntxhov siab-txoj kev kho, npaj rau tus neeg tsim khoom los ua qhov kawg Post-Weld Heat Treatment (PWHT) ntawm lub nkoj ua tiav los txhim kho nws cov khoom tiav.
Khoom:Nws muaj kev tiv thaiv zoo heev rau oxidation thiab sulfide corrosion ntawm qhov kub siab (feem ntau mus txog ~ 650℃/ 1200℃F) thiab zoo creep zog. Txawm li cas los xij, nws muaj qis dua weldability thiab toughness piv rau qis dua -chromium qib zoo li Qib 11 lossis 22, yuav tsum tau siv cov txheej txheem vuam nruj heev thiab ua ntej.
Daim ntawv thov:Nws yog cov khoom siv tshwj xeeb uas siv rau hauv qhov hnyav hnyav heev - qhov kub thiab txias, xws li:
Petroleum Refining: Cheebtsam hauv catalytic cracking units (piv txwv li, reactor cyclones, hloov kab) raug kub catalyst thiab qaub gases.
Kev ua tshuaj lom neeg:Cov nkoj tuav cov txheej txheem corrosive ntws ntawm qhov kub thiab txias.
Lub zog tiam: Qee ntu ntawm cov thee qub- raug rho tawm haujlwm boilers raug siab - kub tshauv corrosion.
Qhov tseem ceeb Distinction:A387 Qib 5 yog qib siab -chromium, corrosion- resistant alloy rau niche, ib puag ncig hnyav, whereas Qib 11, 12, thiab 22 feem ntau yog xaiv rau lawv lub zog thiab hydrogen tsis kam. Nws siv yuav tsum muaj kev txawj ntse tseem ceeb hauv kev vuam thiab kev kho cua sov.
Qhov sib npaug ntawm A387 Qib 5 Chav Kawm 1
| BS | EN | ASME | DIN |
| ... | ... | A387-5-1 | ... |
Specifications ASTM A387 Qib 5 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 5 | 5.00% | 0.50% |
Tensile Requirements rau ASTM A387 Qib 5 Alloy Steel Phaj Chav Kawm 1 Phaj
| Lub npe: | Yuav tsum tau: | Qib 5 |
|
A387 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 ASTM A387 Qib 5 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| A387 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 |
1. Dab tsi tshwj xeeb siab -kub corrosive ib puag ncig pom zoo siv A387 Qib 5 tshaj qis dua -chromium qib zoo li Qib 11 lossis 22?
Cov lus nug no yog tsom rau lub ntsiab lus tsim qauv, tshawb txog cov kev pabcuam niche -xws li sulfidation hnyav lossis oxidation hauv catalytic crackers- qhov twg nws 5% chromium cov ntsiab lus muab qhov tseem ceeb ntawm kev ua tau zoo txawm tias nws cov nqi siab dua thiab kev tsim khoom nyuaj.
2. Dab tsi yog qhov tseem ceeb ntawm kev sib tw vuam thiab cov txheej txheem tseem ceeb rau kev tsim khoom nrog A387 Qib 5 Chav Kawm 1?
Cov lus nug no hais txog cov teeb meem tseem ceeb, tsom mus rau qhov nruj preheating, kev sib cuam tshuam ntawm qhov kub thiab txias, thiab kev xaiv cov hlau tshwj xeeb uas yuav tsum tau ua vim yog cov hlau alloy siab hardenability thiab kev pheej hmoo ntawm qhov txias txias.
3. Vim li cas qhov kawg Post-Weld Heat Treatment (PWHT) rau Qib 5 Chav Kawm 1 tshwj xeeb yog qhov tseem ceeb, thiab yuav tsum tswj hwm qhov xwm txheej twg?
Cov lus nug no qhia txog qhov tseem ceeb ntawm kev tsim cov txheej txheem kawg, hais txog qhov xav tau kom muaj kev sib haum xeeb kom ua tiav qhov muaj zog txaus thiab kev ntxhov siab thaum tsis txhob muaj teeb meem xws li kev loj hlob ntau dhau los yog rov ua dua thaum txias.
4. Hauv cov ntawv thov twg A387 Qib 5 feem ntau tau hloov los ntawm lwm cov ntaub ntawv hauv kev tsim qauv niaj hnub no, thiab vim li cas?
Cov lus nug no tshawb txog cov kev hloov pauv ntawm cov khoom siv, sau tseg tias qib zoo li ASTM A387 Qib 91 (9Cr-1Mo-V) lossis stainless cladding tau hloov qib 5 hauv ntau qhov siab -kub ntsuas vim muaj zog zoo dua -toughness balance lossis nqi-zoo.
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.
