ASTM A387 Qib 12 Chav Kawm 2 Siab Vessel Steel Plate
1.Chrome Moly Phaj Home Page
ASTM A387 Cov khoom lag luam
ASTM A387 Qib 5 Chav Kawm 2|ASTM A387 Qib 9 Chav Kawm 2|ASTM A387 Qib 11 Chav Kawm 2
ASTM A387 Qib 12 Chav Kawm 2|ASTM A387 Qib 22 Chav Kawm 2|ASTM A387 Qib 91 Chav Kawm 2
2.A387 Qib 12 Chav Kawm 2 yog cov khoom zoo chrome molybdenum hlau uas yog qhov zoo tagnrho rau kev pabcuam kub thiab muaj cov yam ntxwv zoo heev los tiv thaiv corrosion.
3.Cov hlau muaj ntau yam kev siv xws li cov boilers thiab cov hlab ntsha siab, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig uas muaj kub ntau ntau.
4. Sib npaugASTM A387 Qib 12 Chav Kawm 2
|
BS |
EN |
ASTM / ASME |
DIN |
|
620 B |
13 ZPO 45 |
A387-12-2 |
13 ZPO 44 |
5.Specifications ntawm ASTM A387 Qib 12 Chav Kawm 2
Chromium & Molybdenum cov ntsiab lus (raws li ASTM specification):
|
Lub npe |
Nominal Chromium |
Nominal Molybdenum |
|
A387 Qib 12 |
1.00% |
0.50% |
6.Tensile Requirements rau Chav Kawm 2 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% |
––– |
7. Cov Khoom Siv TshuajASTM A387 Qib 12 Chav Kawm 2
|
Lub ntsiab |
|
Chemical Composition (%) Inc. Qib & UNS No. |
|
|
|
Qib 12 (UNS: K11757) |
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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 |
8.Tension Test Requirements:
Peb yuav tsum tau sim siv cov qauv kuaj yuav paub meej txog cov kev cai tensile raws li tau teev tseg hauv Table 2.
9.Lwm yam yuav tsum tau:
Cov kev cai hauv qab no thiab cov txheej txheem kuaj (uas tsis tas yuav tsum tau) suav tias yog tsim nyog rau Chrome Molybdenum steel:
Kev kho lub tshuab nqus tsev
Kev tshuaj xyuas khoom
Kev Ntsuas Kev Ntsuas Ntxiv
Charpy V-Ntch Impact Test
Poob Nyhav Test
High Temperature Tension Test
Kev kuaj ultrasonic
Magnetic Particle Examination
1. Dab tsi yog qhov kev tshaj tawm -weld heat treatment (PWHT) kub thiab tuav lub sij hawm rau A387 Gr.12 Cl.2?
Rau A387 Qib 12 Chav Kawm 2, qhov raug pom zoo Post-Weld Heat Treatment (PWHT lossis kev ntxhov siab) qhov kub thiab txias yog 1100℃F txog 1250℃F (595℃txog 675℃). Lub sij hawm tuav feem ntau yog tsawg kawg yog 1 teev ib nti (25 hli) ntawm tuab, nrog rau qhov tsawg kawg nkaus ntawm 1 teev tag nrho. Cov txheej txheem no yog ib qho tseem ceeb los txo cov kev ntxhov siab ntawm vuam, ua kom sov sov- thaj tsam cuam tshuam (HAZ), thiab rov ua kom muaj zog corrosion, ua kom muaj kev ncaj ncees ntawm cov khoom siv hluav taws xob siab.
2. Vim li cas qhov preheating yuav tsum tau ua ntej vuam A387 Gr.12 Cl.2 steel?
Preheating, feem ntau nyob rau hauv thaj tsam ntawm 300℃F mus rau 450℃F (150℃rau 230 degree), yog yuav tsum tau rau vuam A387 Qib 12 hoob 2 los tiv thaiv hydrogen -induced cracking (HIC), kuj hu ua txias cracking. Qhov no alloy lub hardenability yuav ua rau ib tug nkig microstructure nyob rau hauv lub weld cheeb tsam thaum txias ceev. Preheating slows tus nqi cua txias, tso cai rau hydrogen diffuse tawm thiab txo txoj kev pheej hmoo ntawm kev sib tsoo - martensite susceptible martensite, yog li ua kom lub suab, tsis xws luag - weld dawb.
3. Dab tsi yog qhov siab tshaj qhov kev pabcuam kub rau A387 Gr.12 Cl.2 daim hlau?
Qhov siab tshaj plaws tau pom zoo ua haujlwm kub kub rau ASTM A387 Qib 12 Chav Kawm 2 daim hlau feem ntaumus txog 1000℃F (540 degree). Ntawm qhov ntsuas kub siab no, cov ntsiab lus chromium muab kev tiv thaiv zoo rau oxidation (scaling) thiab corrosion, thaum molybdenum txhim kho lub zog thiab txo qis. Rau kev pabcuam saum toj no qhov kub thiab txias, qib nrog cov ntsiab lus chromium siab dua (xws li Qib 11 lossis 22) feem ntau suav hais tias.
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.
