Ob leeg BV D620 thiab BV D690 yog siab - lub zog steel daim hlau uas tau lees paub los ntawm Bureau Veritas (BV), uas yog lub koom haum kev faib tawm thoob ntiaj teb. Cov qhab nia no feem ntau yog tsim los rau kev thov rau kev thov marine thiab offshore, xws li nkoj hulls, offshore qauv, thiab cov nkoj siab. Lawv muab kev sib xyaw ua ke zoo heev ntawm lub zog siab, zoo toughness, thiab weldability, ua rau kev tsim kho ntawm cov qauv sib dua thiab muaj zog dua.
Qhov txawv tseem ceeb:
Thawj qhov txawv yog nyob rau hauv lawv qhov tsawg kawg nkaus yield zog. BV D620 muaj qhov tsawg kawg nkaus yield zog ntawm 620 MPa, thaum BV D690 muaj qhov siab tshaj tawm lub zog ntawm 690 MPa. Qhov no ua rau D690 muaj zog dua ntawm ob, tso cai rau cov qauv tsim nrog txo cov phaj tuab raws li qhov sib npaug ntawm cov khoom thauj khoom, uas yog qhov tseem ceeb rau qhov hnyav - cov ntawv thov rhiab heev.
Yuav kom ua tiav lub zog siab dua no, D690 feem ntau muaj cov txheej txheem sib xyaw ua ke ntau dua thiab tswj tau dov lossis quenching thiab tempering (Q&T) txheej txheem kev kho cua sov. Yog li ntawd, D690 tej zaum yuav muaj qhov toughness qis dua thiab xav tau cov txheej txheem vuam ntau dua los tswj nws cov khoom siv hluav taws xob hauv tshav kub- thaj tsam cuam tshuam piv rau D620. Qhov kev xaiv ntawm ob qib yog qhov kev txiav txim siab engineering ntsuas qhov xav tau ntawm lub zog siab dua (D690) tiv thaiv cov yam xws li kev tsim khoom nyuaj, qhov yuav tsum tau muaj zog, thiab tag nrho cov nqi.
Tshuaj muaj pes tsawg leeg
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BV D620 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 D620 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
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BV D690 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 |
|
|
wb D690 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
Mechanical Property
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BV D620 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 D620 |
Min Mpa |
Mpa |
Tsawg% |
-20 |
J |
J |
|
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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BV D690 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 |
|
|
wb D690 |
Min Mpa |
Mpa |
Tsawg% |
-20 |
J |
J |
|
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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