DNV D thiab DNV E yog cov txheej txheem ntawm kev tsim cov nkoj tsim thiab sab nrauv cov qauv hlau daim hlau uas tau lees paub los ntawm Det Norske Veritas (DNV), sib txawv feem ntau los ntawm lawv qhov qis - qhov kub thiab txias ntawm qhov yuav tsum tau muaj zog toughness. Thaum ua ke nrog lub zog ntxiv (piv txwv li, D420, E550), lawv tsim cov qib steel tiav. Hauv kev sib cais, "DNV D" thiab "DNV E" feem ntau xa mus rau cov qauv muaj zog ntawm 235 MPa tawm los, sib npaug rau qib DNV A thiab B qib tab sis nrog kev txhim kho toughness.
Qhov txawv tseem ceeb
Qhov sib txawv tseem ceeb yog qhov ntsuas qhov ntsuas qhov tsawg kawg nkaus rau kev cuam tshuam toughness. DNV D qib steel yuav tsum tau tswj kom muaj kev cuam tshuam lub zog txaus (ua haujlwm rau cov pob txha tawg) ntawm qhov kub ntawm -20℃. DNV E qib steel yuav tsum ua tau raws li qhov yuav tsum tau ua ntawm qhov kub thiab txias ntawm -40℃. Qhov no xaiv cov qib E raws li qhov tsim nyog rau cov kev pabcuam Arctic, cov hlab ntsha mus rau dej khov, thiab cov qauv ua haujlwm hauv cov cheeb tsam qaum teb, qhov uas muaj kev pheej hmoo ntawm cov pob txha tawg yog siab tshaj. Txhawm rau ua tiav qhov kev ua tau zoo ntawm qhov kub thiab txias, qib E tau txais kev tswj hwm tshuaj lom neeg muaj pes tsawg leeg thiab ua tiav (piv txwv li, kev ua kom zoo nplej) piv rau qib D. Yog li ntawd, DNV D yog tus qauv rau cov nkoj dav dav hauv cov huab cua txias, thaum DNV E yog qhov tseem ceeb rau kev ua haujlwm hauv Arctic lossis Antarctic hnyav.
Tshuaj muaj pes tsawg leeg
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DNV GRADE D general Strength Chemical Composition |
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Qib |
Cov ntsiab lus Max (%) |
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C |
Si |
Mn |
P |
S |
Al |
N |
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DNV Qib D |
0.21 |
0.10-0.35 |
0.60 |
0.035 |
0.035 |
0.015 |
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|
Nb |
V |
Ti |
Cu |
Cr |
Ni |
Mo |
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DNV QIB E general Strength Chemical Composition |
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Qib |
Cov ntsiab lus Max (%) |
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|
C |
Si |
Mn |
P |
S |
Al |
N |
|
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DNV Qib E |
0.18 |
0.10-0.35 |
0.70 |
0.035 |
0.035 |
0.015 |
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Nb |
V |
Ti |
Cu |
Cr |
Ni |
Mo |
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Mechanical Property
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DNV GRADE D general zog khoom |
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|
Qib |
|
Mechanical Property |
Charpy V Impact Test |
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Thickness |
Yield |
Tensile |
Elongation |
Qib |
Zog 1 |
Zog 2 |
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|
DNV Qib D |
mm |
Min Mpa |
Mpa |
Tsawg% |
-20 |
J |
J |
|
t Tsawg dua lossis sib npaug li 50 |
235 |
400-520 |
22% |
20 |
27 |
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50＜t Tsawg dua lossis sib npaug rau 70 |
235 |
400-520 |
22% |
24 |
34 |
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70＜t Tsawg dua lossis sib npaug rau 150 |
235 |
400-520 |
22% |
27 |
41 |
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Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev |
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DNV GRADE E cov cuab yeej muaj zog hauv tempering thiab quenching |
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|
Qib |
|
Mechanical Property |
Charpy V Impact Test |
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|
Thickness |
Yield |
Tensile |
Elongation |
Qib |
Zog 1 |
Zog 2 |
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|
DNV Qib E |
mm |
Min Mpa |
Mpa |
Tsawg% |
-40 |
J |
J |
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t Tsawg dua lossis sib npaug li 50 |
235 |
400-520 |
22% |
20 |
27 |
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50＜t Tsawg dua lossis sib npaug rau 70 |
235 |
400-520 |
22% |
24 |
34 |
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70＜t Tsawg dua lossis sib npaug rau 150 |
235 |
400-520 |
22% |
27 |
41 |
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Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev |
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