Qhov sib txawv ntawm BV D420 thiab BV D550 steel phaj

BV D420 yog lub siab - lub zog marine steel phaj ntawv pov thawj los ntawm Bureau Veritas (BV). Qib "D" txhais tau hais tias nws raug kuaj ntawm -20 degree, ua rau nws tsim nyog rau lub nkoj hulls thiab cov qauv hauv ntug dej hiav txwv ua haujlwm nyob rau hauv qhov chaw txias marine. Nws muaj qhov tsawg kawg nkaus lub zog ntawm 420 MPa thiab tensile lub zog ntawm 530 mus rau 680 MPa, nrog rau 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 lossis thermomechanical control processed (TMCP) cov xwm txheej.

BV D550 yog ib qho ntxiv - siab - lub zog marine steel phaj kuj tau lees paub los ntawm Bureau Veritas (BV), nrog rau kev cuam tshuam toughness kuaj ntawm -20℃. Lub "550" qhia txog qhov tsawg kawg nkaus lub zog ntawm 550 MPa thiab lub zog tensile xws li 670 txog 830 MPa, nrog qhov tsawg kawg nkaus elongation ntawm 16%. Cov tshuaj muaj pes tsawg leeg suav nrog cov pa roj carbon tsawg dua lossis sib npaug li 0.21%, manganese Tsawg dua lossis sib npaug li 1.70%, thiab cov ntsiab lus microalloying xws li Nb thiab V los txhim kho lub zog thaum tuav cov khoom zoo. Qib no yog tsim los rau kev xav tau cov khoom siv hauv kev tsim cov nkoj thiab cov chaw tawm sab nrauv uas xav tau lub zog zoo tshaj - rau qhov hnyav piv.

Ob leeg BV D420 thiab BV D550 yog BV- ntawv pov thawj siab - lub zog marine steels nrog kev cuam tshuam toughness kuaj ntawm -20 degree, 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: D420 muaj qhov tsawg kawg nkaus lub zog ntawm 420 MPa nrog tensile lub zog ntawm 530-680 MPa, haum rau dav dav dav - lub zog hull kev tsim kho thiab cov qauv sab nrauv, thaum D550 muab qhov siab tshaj qhov siab tshaj qhov siab tshaj plaws ntawm lub zog ntawm tensile zog ntawm 55000 MPa{100}{101} MPa, tsim los rau kev thov ntau dua load-bearing daim ntawv thov uas yuav tsum tau superior zog-rau-hnyav piv. Ob qib tshwj xeeb tswj cov tshuaj muaj pes tsawg leeg thiab xav tau kev ua tiav zoo li TMCP lossis quenching thiab tempering kom ua tiav lawv cov khoom siv kho tshuab thaum tuav cov weldability zoo rau kev pabcuam marine tseem ceeb.

Tshuaj muaj pes tsawg leeg

Mechanical Property