A387 Qib 12 Chav Kawm 1
A387 Qib 12 Chav Kawm 1yog ib qho chromium-molybdenum alloy steel phaj tsim los rau kev pabcuam lub nkoj siab ntawm qhov kub siab.
Alloy Composition:Nws cov ntsiab lus chemistry yog kwv yees li 1% Chromium (Cr) thiab 0.5% Molybdenum (Mo), tso nws ntawm carbon steel thiab ntau dua 1.25Cr-0.5Mo (Qib 11) hauv kev ua haujlwm thiab nqi.
Kev kho cua sov (Class 1):Qhov kev xaiv "Class 1" txhais tau hais tias lub phaj tau muab rau hauv qhov qub lossis kev ntxhov siab-txoj kev kho, npaj rau tus neeg tsim khoom ua qhov kawg Post-Weld Heat Treatment (PWHT) ntawm lub nkoj ua tiav.
Khoom:Nws muaj kev txhim kho siab - kub lub zog, oxidation, thiab corrosion kuj piv rau carbon steel, tab sis qis dua qib 11. Nws muaj weldability zoo thiab formability nrog cov txheej txheem tsim nyog.
Daim ntawv thov:Nws feem ntau yog siv nyob rau hauv nruab nrab -kub siab cov hlab ntsha xws li tej yam boilers, tshav kub exchangers, thiab cov txheej txheem cov khoom siv nyob rau hauv lub zog tsim thiab petrochemical industries, qhov twg ib puag ncig yog tsawg tshaj li qhov yuav tsum tau rau Qib 11 los yog 22. Nws siv tau poob rau hauv kev pom zoo ntawm ntau muaj peev xwm los yog nqi - qib sib tw.
Qhov Tseem Ceeb Distinction: A387 Qib 12 yog qis dua - alloy, qis dua - tus nqi hloov mus rau Qib 11 rau qhov xav tau qis dua qhov kub siab.
Qhov sib npaug ntawm A387 Qib 12 Chav Kawm 1
| BS | EN | ASTM / ASME | DIN |
| 620 B | 13 ZPO 45 | A387-12-1 | 13 ZPO 44 |
Specifications rau ASTM A387 Qib 12 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 12 | 1.00% | 0.50% |
Tensile Requirements rau ASTM A387 Qib 12 Alloy Steel Phaj Chav Kawm 1 Phaj
| Lub npe: | Yuav tsum tau: | Qib 12 |
| A387 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 ASTM A387 Qib 12 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| ASTM A387 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 |
1. Dab tsi yog qhov zoo ntawm kev xaiv A387 Qib 12 Chav Kawm 1 tshaj carbon steel rau lub nkoj siab?
Cov lus nug no tsom mus rau kev lag luam thiab kev ua tau zoo rau kev kho dua tshiab ntawm cov hlau, feem ntau yog rau cov kev pabcuam kub nruab nrab uas Qib 12 muaj kev txhim kho lub zog thiab oxidation tsis kam ntawm tus nqi tsim nyog.
2. Vim li cas ib tug engineer yuav qhia Qib 12 es tsis yog qib 11 ntau dua?
Lo lus nug no tshawb txog kev lag luam tawm - tawm ntawm kev ua haujlwm ntawm cov khoom siv thiab cov phiaj xwm kev lag luam, raws li Qib 12 muaj tus nqi -txuag kev xaiv thaum cov kev pab cuam nyob rau hauv nws qhov kev txwv siab dua - kub thiab corrosion kuj muaj peev xwm.
3. Dab tsi yog qhov siab tshaj - qhov ntsuas kub ntawm A387 Qib 12 piv rau Qib 11 yog dab tsi?
Cov lus nug no hais txog cov kev ciam teb ntawm cov hlau, tsom mus rau nws cov ntsiab lus chromium thiab molybdenum uas ua rau txo qis oxidation tsis kam, creep zog, thiab hydrogen nres tsis kam ntawm qhov kub siab.
4. Kev kho cua sov thiab vuam txheej txheem rau Qib 12 Chav Kawm 1 piv rau cov pa roj carbon steel li cas?
Lo lus nug no qhia txog qhov kev cuam tshuam ntawm kev siv cov hlau tsis tshua muaj- alloy steel, sau tseg tias thaum zoo li cov pa roj carbon steel, nws feem ntau yuav tsum nruj dua preheat, tswj kom txias, thiab yuav tsum tau Post-Weld Heat Treatment (PWHT) kom ua tiav cov khoom 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.
