BV E420 yog lub siab - lub zog nkoj tsim steel phaj ntawv pov thawj los ntawm Bureau Veritas (BV). Qib "E" txhais tau hais tias nws raug kuaj ntawm -40 degree, nrog qhov cuam tshuam tsawg kawg nkaus ntawm 28J (transverse) lossis 42J (ntev ntev). Nws muaj qhov tsawg kawg nkaus lub zog ntawm 420 MPa thiab tensile lub zog ntawm 530 mus rau 680 MPa, nrog qhov tsawg kawg nkaus elongation ntawm 18%. Cov tshuaj muaj pes tsawg leeg yog tswj nruj me ntsis nrog cov pa roj carbon tsawg dua lossis sib npaug li 0.20%, manganese Tsawg dua lossis sib npaug li 1.70%, thiab silicon Tsawg dua lossis sib npaug li 0.55%. Qib no feem ntau yog muab rau hauv quenched thiab tempered (QT) lossis thermomechanical controlled processed (TMCP) tej yam kev mob. Nws yog dav siv rau kev tsim kho lub nkoj, decks, thiab cov khoom siv ntawm cov nkoj thiab cov qauv sab nrauv ua haujlwm nyob rau hauv qhov chaw txias marine.
BV E500 yog ib qho ntxiv - siab - lub zog marine steel kuj tau lees paub los ntawm Bureau Veritas (BV) nrog rau kev cuam tshuam toughness kuaj ntawm -40 degree, yuav tsum muaj qhov cuam tshuam tsawg kawg nkaus ntawm 33J (transverse) lossis 50J (ntev). Lub "500" qhia txog qhov tsawg kawg nkaus tawm lub zog ntawm 500 MPa . Nws muaj lub zog tensile xws li 610 txog 770 MPa thiab elongation yam tsawg kawg nkaus ntawm 16%. Cov tshuaj muaj pes tsawg leeg muaj cov pa roj carbon tsawg dua lossis sib npaug li 0.20%, manganese Tsawg dua lossis sib npaug li 1.70%, nrog kev tswj nruj ntawm phosphorus thiab sulfur. Qib no yuav tsum tau ua tiav qib siab thiab feem ntau yog muab rau hauv quenched thiab tempered (QT) lossis TMCP cov xwm txheej. Nws yog tsim los rau kev xav tau cov qauv hauv kev tsim khoom hauv nkoj, cov chaw sab nrauv, thiab cov qauv hauv hiav txwv uas xav tau lub zog zoo tshaj - rau qhov hnyav piv.
Ob leeg BV E420 thiab BV E500 yog BV- ntawv pov thawj siab - lub zog marine steels nrog qis zoo heev - qhov kub thiab txias tau sim ntawm -40 degree, kom ntseeg tau tias kev ua tau zoo nyob rau hauv qhov hnyav marine ib puag ncig nrog rau Arctic tej yam kev mob . Lawv qhov sib txawv tseem ceeb nyob rau hauv lub zog theem: E420 muaj qhov tsawg kawg nkaus tawm lub zog ntawm 420 MPa nrog tensile lub zog ntawm 530-680 MPa, haum rau dav siv lub zog siab hull, thaum E500 muab ib tug siab tshaj tawm lub zog ntawm 500 MPa nrog tensile zog thov mus txog 610-70 pob ntseg daim ntaub ntawv. Ob qib tshwj xeeb tswj cov tshuaj muaj pes tsawg leeg nrog cov pa roj carbon tsawg dua lossis sib npaug li 0.20% thiab manganese Tsawg dua lossis sib npaug li 1.70%, thiab yuav tsum tau ua tiav qib siab zoo li QT lossis TMCP kom ua tiav lawv cov khoom siv kho tshuab thaum tuav cov khoom zoo rau kev pabcuam marine tseem ceeb.
Tshuaj muaj pes tsawg leeg
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BV E420 ntxiv Cov Tshuaj Muaj Zog 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 E420 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
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BV E500 ntxiv Cov Tshuaj Muaj Zog 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 E500 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
Mechanical Property
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BV E420 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 E420 |
Min Mpa |
Mpa |
Tsawg% |
-40 |
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 E500 ntxiv Cov khoom muaj zog siab hauv Tempering thiab quenching |
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|
Qib |
Mechanical Property |
Charpy V Impact Test |
||||
|
Yield |
Tensile |
Elongation |
Qib |
Zog 1 |
Zog 2 |
|
|
BV E500 |
Min Mpa |
Mpa |
Tsawg% |
-40 |
J |
J |
|
500 |
610-770 |
16% |
33 |
50 |
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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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