DNV D420 thiab DNV D690 yog cov qauv hlau daim hlau tau lees paub los ntawm Det Norske Veritas (DNV) rau kev siv dej hiav txwv thiab sab nrauv, sawv cev rau ob qhov kawg ntawm qhov siab - lub zog steel spectrum. Qhov kev xaiv "D" hauv ob qib qhia tias lawv qhov kev cuam tshuam toughness tau lees paub ntawm -20 degree. Cov lej lej suav hais tias qhov tsawg kawg nkaus tawm lub zog hauv megapascals (MPa): DNV D420 muab 420 MPa, thaum DNV D690 xa ntau dua 690 MPa.
Qhov txawv tseem ceeb
Qhov tseem ceeb ntawm qhov sib txawv yog nyob rau hauv lawv lub zog theem, kev siv ib txwm, thiab fabricability. DNV D690 muaj kwv yees li 64% siab dua qhov muaj zog tshaj D420. Qhov no ultra-lub zog siab yog qhov tseem ceeb rau kev siv huab cua xws li cov icebreaker hulls, hnyav- nqa lub nkoj, lossis siab -siab tawm ntawm ntug dej hiav txwv uas txo qhov hnyav ntawm cov qauv tseem ceeb. Txawm li cas los xij, kev ua tiav lub zog no feem ntau yuav tsum muaj cov txheej txheem quenching thiab tempering, uas ua rau muaj teeb meem loj dua hauv vuam, txiav, thiab tsim, nrog rau cov nqi siab dua. Hauv qhov sib piv, DNV D420 yog ntau yam, tus nqi - siv tau siab - qib siab dav siv dav dav hauv nkoj nkoj thiab cov qauv sab nrauv. Nws muaj qhov sib npaug zoo ntawm lub zog, zoo dua weldability thiab formability, thiab ua pov thawj kev ua tau zoo rau feem ntau daim ntawv thov uas yuav tsum tau txhim khu kev qha toughness mus rau -20℃. Qhov kev xaiv yog daim ntawv thov-tsav: Xaiv D690 tsuas yog qhov twg nws lub zog siab heev-rau- qhov hnyav piv yog qhov tseem ceeb; xaiv D420 rau qhov muaj zog, tsim tau, thiab kev daws teeb meem rau feem ntau ntawm cov txheej txheem marine muaj zog.
Tshuaj muaj pes tsawg leeg
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DNV D420 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 |
|
|
NWS D420 |
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 D690 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 |
|
|
NWS D690 |
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 D420 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 |
|
|
NWS D420 |
mm |
Min Mpa |
Mpa |
Tsawg% |
-20 |
J |
J |
|
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 D690 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 |
|
|
NWS D690 |
mm |
Min Mpa |
Mpa |
Tsawg% |
-20 |
J |
J |
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t Tsawg dua lossis sib npaug li 50 |
690 |
770-940 |
14% |
46 |
69 |
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50＜t Tsawg dua lossis sib npaug rau 70 |
690 |
770-940 |
14% |
46 |
69 |
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|
70＜t Tsawg dua lossis sib npaug rau 150 |
690 |
770-940 |
14% |
46 |
69 |
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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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