BV D550 yog ib qho ntxiv - siab - lub zog marine steel phaj ntawv pov thawj los ntawm Bureau Veritas (BV). Qib "D" qhia tau hais tias nws raug kuaj ntawm -20 ° C. Nws muaj qhov tsawg kawg nkaus yield zog ntawm 550 MPa thiab tensile lub zog ntawm 670 mus rau 830 MPa, nrog tsawg kawg elongation ntawm 16%. Cov tshuaj muaj pes tsawg leeg yog nruj me ntsis tswj nrog carbon ≤0.20%, manganese ≤1.70%, thiab microalloying ntsiab. 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 nkoj tsim, offshore platforms, thiab marine engineering lug ua hauj lwm nyob rau hauv txias ib puag ncig.
BV D620 yog ib qho ultra- siab - lub zog marine steel kuj tau lees paub los ntawm Bureau Veritas (BV) nrog rau kev cuam tshuam toughness kuaj ntawm -20 ° C . Lub "620" qhia txog qhov tsawg kawg nkaus tawm lub zog ntawm 620 MPa . Nws muaj lub zog tensile xws li 720 txog 890 MPa thiab elongation yam tsawg kawg nkaus ntawm 15%. Cov tshuaj muaj pes tsawg leeg nta carbon ≤0.20%, manganese ≤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 cov khoom siv uas xav tau tshaj plaws hauv kev tsim cov nkoj, ultra-cov dej tob hauv ntug dej hiav txwv, thiab Arctic{18}}cov nkoj uas xav tau lub zog siab tshaj plaws{19}} rau qhov hnyav piv.
Ob leeg BV D550 thiab BV D620 yog BV- ntawv pov thawj ntxiv - siab - lub zog marine steels nrog rau kev cuam tshuam toughness kuaj ntawm -20 ° C, kom ntseeg tau tias kev ua tau zoo nyob rau hauv qhov chaw txias marine. Lawv qhov sib txawv tseem ceeb nyob rau hauv lub zog theem: D550 muaj qhov tsawg kawg nkaus lub zog ntawm 550 MPa nrog tensile lub zog ntawm 670-830 MPa, haum rau siab - lub zog tawm ntawm ntug dej hiav txwv , thaum D620 muab ib qho tseem ceeb ntau dua qhov tsawg kawg nkaus yield zog ntawm 620 MPa nrog tensile zog {{1} 720}, tsim kom muaj zog tensile ntawm 620 MPa , qhov xav tau tshaj plaws load-bearing daim ntawv thov yuav tsum tau ntau tshaj lub zog-rau-hnyav piv. Ob qib tshwj xeeb tswj cov tshuaj muaj pes tsawg leeg nrog carbon ≤0.20% thiab manganese ≤1.70%, thiab yuav tsum tau ua tiav zoo li QT lossis TMCP kom ua tiav lawv cov khoom siv zoo tshaj plaws thaum tswj xyuas qhov zoo weldability rau kev pabcuam marine tseem ceeb.
Tshuaj muaj pes tsawg leeg
BV D550 ntxiv Cov Khoom Siv Muaj Zog Muaj Zog Tempering thiab Quenching | |||||||
Qib | Cov ntsiab lus Max (%) | ||||||
C | Si | Mn | P | S | Al (min) | N | |
BV D550 | 0.20 | 0.55 | 1.70 | 0.030 | 0.030 | 0.015 | 0.020 |
BV D690 ntxiv Cov Tshuaj Muaj Zog Muaj Zog Muaj Zog Tempering thiab Quenching | |||||||
Qib | Cov ntsiab lus Max (%) | ||||||
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
BV D550 ntxiv Cov khoom muaj zog siab hauv Tempering thiab Quenching | ||||||
Qib | Mechanical Property | Charpy V Impact Test | ||||
Yield | Tensile | Elongation | Qib | Zog 1 | Zog 2 | |
BV D550 | Min Mpa | Mpa | Tsawg% | -20 | J | J |
550 | 670-830 | 16% | 37 | 55 | ||
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev | ||||||
BV D690 ntxiv Cov khoom muaj zog siab hauv Tempering thiab quenching | ||||||
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 | ||
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev | ||||||
