BV D420 thiab BV D460 yog siab -lub zog, normalized los yog thermomechanically dov cov qauv steel daim hlau ntawv pov thawj los ntawm Bureau Veritas (BV). Lawv feem ntau yog siv nyob rau hauv shipbuilding thiab offshore qauv uas yuav tsum tau ua ke ntawm lub zog, toughness, thiab weldability. Qhov kev xaiv "D" tshwj xeeb qhia tau hais tias cov khoom siv yog npaj rau kev siv qis - qhov kub thiab txias, nrog rau nws cov khoom, tshwj xeeb tshaj yog muaj zog toughness, guaranteed ntawm qhov kub thiab txias li -20℃(los yog -40℃rau qee qhov subgrades). Cov lej lej (420, 460) qhia txog qhov tsawg kawg nkaus tawm lub zog hauv megapascals (MPa). Yog li ntawd, BV D460 muaj ib tug ntau dua guaranteed yield zog ntawm tsawg kawg yog 460 MPa, piv rau BV D420's 420 MPa.
Qhov txawv tseem ceeb
Qhov sib txawv tseem ceeb nyob rau hauv lawv cov qib zog thiab qhov sib npaug ntawm cov khoom siv kho tshuab. BV D460 muab kwv yees li 9.5% siab zog tawm los ntawm D420. Qhov no ua rau D460 haum rau cov ntawv thov kom muaj peev xwm thauj khoom ntau dua lossis qhov twg qhov hnyav txo los ntawm kev siv cov ntu nyias yog qhov tseem ceeb. Txawm li cas los xij, ua tiav lub zog siab dua no hauv qib D460 feem ntau cuam tshuam nrog kev ua kom nruj dua thiab ua tiav. Raws li qhov tshwm sim, BV D420 feem ntau nthuav tawm cov ductility zoo, toughness, thiab yooj yim weldability piv rau D460. Qhov no ua rau D420 yog qhov kev xaiv zoo tshaj plaws rau cov khoom muaj kev ntxhov siab nyob rau hauv qhov chaw txias qhov chaw tiv thaiv kev tawg tawg yog qhov tseem ceeb, lossis rau cov ntaub ntawv nyuaj uas yuav tsum tau ua ntau yam. Hauv cov ntsiab lus, qhov kev xaiv yog kev lag luam tawm -tawm: Xaiv D460 kom muaj zog dua; xaiv D420 rau qhov zoo tshaj plaws tsawg-kub toughness thiab fabricability.
Tshuaj muaj pes tsawg leeg
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BV D420 ntxiv High Strength Chemical Composition Tempering thiab Quenching |
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Qib |
Cov ntsiab lus Max (%) |
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|
C |
Si |
Mn |
P |
S |
Al (min) |
N |
|
|
BV D420 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
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BV D460 ntxiv Cov Khoom Siv Muaj Zog Muaj Zog Tempering thiab Quenching |
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|
Qib |
Cov ntsiab lus Max (%) |
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C |
Si |
Mn |
P |
S |
Al (min) |
N |
|
|
BV D460 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
Mechanical Property
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BV D420 ntxiv Cov khoom muaj zog siab hauv Tempering thiab quenching |
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Qib |
Mechanical Property |
Charpy V Impact Test |
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|
Yield |
Tensile |
Elongation |
Qib |
Zog 1 |
Zog 2 |
|
|
BV D420 |
Min Mpa |
Mpa |
Tsawg% |
-20 |
J |
J |
|
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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BV D460 ntxiv Cov khoom muaj zog siab hauv Tempering thiab quenching |
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Qib |
Mechanical Property |
Charpy V Impact Test |
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Yield |
Tensile |
Elongation |
Qib |
Zog 1 |
Zog 2 |
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|
BV D460 |
Min Mpa |
Mpa |
Tsawg% |
-20 |
J |
J |
|
460 |
570-720 |
17% |
31 |
46 |
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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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