DNV E420 yog lub siab - lub zog shipbuilding steel ntawv pov thawj los ntawm DNV (Det Norske Veritas). Qhov kev xaiv "E" qhia tias nws raug sim rau qhov cuam tshuam rau lub zog ntawm -40 degree, kom ntseeg tau tias kev ua tau zoo hauv cov dej hiav txwv txias. Tus naj npawb "420" qhia nws qhov kev tawm dag zog tsawg kawg nkaus ntawm 420 MPa . Nws muaj lub zog tensile xws li 530 txog 680 MPa thiab qhov tsawg kawg nkaus elongation ntawm 18%. Qib no feem ntau muaj cov ntsiab lus microalloying xws li Nb, V, thiab Ti los txhim kho lub zog thiab tawv. Nws yog feem ntau muab nkag rau hauv cov dov, TMCP, los yog quenched thiab tempered tej yam kev mob thiab yog dav siv rau kev tsim kho hull, decks, thiab offshore lug xav tau siab zog thiab zoo weldability.
DNV E620 yog ib qho ntxiv -siab- lub zog steel qauv rau kev siv dej hiav txwv, kuj tau lees paub los ntawm DNV nrog rau kev ntsuas cuam tshuam ntawm -40℃. Lub "620" qhia txog qhov tsawg kawg nkaus lub zog ntawm 620 MPa, ua rau nws muaj zog dua E420 . Nws muaj lub zog tensile ntau dua li ntawm 700 txog 880 MPa (los yog 770-940 MPa hauv qee qhov tshwj xeeb) thiab qhov tsawg kawg nkaus elongation ntawm kwv yees li 14%. Qib no yuav tsum muaj kev tswj xyuas cov khoom siv hlau zoo dua thiab feem ntau yog muab rau hauv quenched thiab tempered (QT) lossis TMCP cov xwm txheej kom ua tiav nws cov cuab yeej zoo tshaj plaws. Nws yog tsim los rau cov kev xav tau tshaj plaws hauv cov khoom siv hauv nkoj, cov chaw ua haujlwm sab nrauv, thiab cov platforms uas qhov siab tshaj plaws zog-rau-qhov hnyav piv yog qhov tseem ceeb.
Ob leeg DNV E420 thiab DNV E620 yog DNV- ntawv pov thawj siab - lub zog steels nrog zoo heev qis - kub toughness kuaj ntawm -40 degree, kom ntseeg tau tias muaj kev ntseeg siab nyob rau hauv hnyav marine tej yam kev mob . Lawv qhov sib txawv tseem ceeb nyob hauv qib siab: E420 muaj qhov tsawg kawg nkaus tawm lub zog ntawm 420 MPa thiab tensile lub zog ntawm 530-680 MPa, haum rau dav dav - lub zog hull kev tsim kho thiab cov qauv sab nrauv. E620 muab qhov muaj zog ntau dua qhov tsawg kawg nkaus ntawm 620 MPa nrog lub zog tensile ncav cuag 700-940 MPa, tsim los rau ntxiv -cov ntawv siv zog siab hauv cov khoom tseem ceeb ntawm cov kabmob . Ob qib xav tau kev tswj hwm kev ua haujlwm (TMCP lossis QT) thiab cov chemistry meej kom ua tiav lawv cov khoom siv kho tshuab, tab sis E620 xav kom muaj kev tswj hwm nruj dua kom xa nws lub zog zoo dua thaum tswj kom muaj zog txaus rau Arctic-class marine kev pabcuam.
Tshuaj muaj pes tsawg leeg
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DNV E420 ntxiv muaj zog Chemical Composition |
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Qib |
Cov ntsiab lus Max (%) |
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C |
Si |
Mn |
P |
S |
Al |
N |
|
|
DNV E420 |
0.20 |
0.10-0.55 |
1.7 |
0.030 |
0.030 |
0.015-0.08 |
0.020 |
|
Nb |
V |
Ti |
Cu |
B |
Ni |
Mo |
|
|
0.02-0.05 |
0.04-0.10 |
0.02 |
|
0.005 |
|
|
|
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DNV E620 ntxiv muaj zog Chemical Composition |
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|
Qib |
Cov ntsiab lus Max (%) |
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|
C |
Si |
Mn |
P |
S |
Al |
N |
|
|
DNV E620 |
0.20 |
0.10-0.55 |
1.7 |
0.030 |
0.030 |
0.015-0.08 |
0.020 |
|
Nb |
V |
Ti |
Cu |
B |
Ni |
Mo |
|
|
0.02-0.05 |
0.04-0.10 |
0.02 |
|
0.005 |
|
|
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Mechanical Property
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DNV E420 ntxiv cov khoom muaj zog dav dav |
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|
Qib |
|
Mechanical Property |
Charpy V Impact Test |
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Thickness |
Yield |
Tensile |
Elongation |
Qib |
Zog 1 |
Zog 2 |
|
|
DNV E420 |
mm |
Min Mpa |
Mpa |
Tsawg% |
-40 |
J |
J |
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t Tsawg dua lossis sib npaug li 50 |
420 |
530-680 |
18% |
28 |
42 |
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50＜t Tsawg dua lossis sib npaug rau 70 |
420 |
530-680 |
18% |
28 |
42 |
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70＜t Tsawg dua lossis sib npaug rau 150 |
420 |
530-680 |
18% |
28 |
42 |
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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 E620 ntxiv cov khoom muaj zog dav dav |
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|
Qib |
|
Mechanical Property |
Charpy V Impact Test |
||||
|
Thickness |
Yield |
Tensile |
Elongation |
Qib |
Zog 1 |
Zog 2 |
|
|
DNV E620 |
mm |
Min Mpa |
Mpa |
Tsawg% |
-40 |
J |
J |
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t Tsawg dua lossis sib npaug li 50 |
620 |
720-890 |
15% |
41 |
62 |
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50＜t Tsawg dua lossis sib npaug rau 70 |
620 |
720-890 |
15% |
41 |
62 |
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70＜t Tsawg dua lossis sib npaug rau 150 |
620 |
720-890 |
15% |
41 |
62 |
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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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