Dab tsi yog qhov txawv ntawm CCS FQ47 thiab CCS FQ70 steel phaj?

CCS FQ47 yog ib qho ntxiv - siab - lub zog marine steel phaj ntawv pov thawj los ntawm Tuam Tshoj Classification Society (CCS). Lub npe "FQ" qhia tau hais tias nws yog quenched thiab tempered steel nrog kev cuam tshuam toughness kuaj ntawm qhov kub tsis tshua muaj siab ntawm -60 ° C . Nws muaj qhov tsawg kawg nkaus lub zog ntawm 460 MPa thiab tensile lub zog ntawm 570 txog 720 MPa. Qhov tsawg kawg nkaus elongation feem ntau yog 17%. Nws cov tshuaj muaj pes tsawg leeg yog nruj me ntsis tswj xyuas kom zoo weldability, nrog carbon sib npaug (Ceq) txwv teev los ntawm CCS cov cai. Qib no yog tsim los rau cov txheej txheem tseem ceeb nyob rau hauv ntug dej hiav txwv drilling rigs, dej khov-chav kawm nkoj, thiab Arctic marine ib puag ncig uas yuav tsum tau tshwj xeeb tsis tshua muaj kub toughness.

CCS FQ70 yog ib qho ultra-siab- lub zog marine steel phaj kuj tau ntawv pov thawj los ntawm CCS, tsim los ntawm quenching thiab tempering (QT) los yog thermomechanical tswj kev ua (TMCP). Lub "70" qhia txog qhov tsawg kawg nkaus lub zog ntawm 690 MPa thiab tensile lub zog ntawm 770 txog 940 MPa, nrog rau qhov tsawg kawg nkaus elongation ntawm 14%. Zoo li FQ47, nws raug kuaj xyuas ntawm -60 ° C, nrog rau qhov tsawg kawg nkaus kev xav tau ntawm lub zog ntawm 46J (transverse) thiab 62J (ntev ntev). Cov tshuaj lom neeg muaj pes tsawg leeg muaj cov ntsiab lus siab tshaj plaws ntawm 0.18%, uas yog qis dua FQ47 qhov kev txwv, ua rau kev txhim kho weldability thaum tuav lub zog siab. Qib no yog tsim los rau cov kev thov uas xav tau tshaj plaws xws li tus kheej- tsa qhov chaw drilling, ultra- cov nkoj loj, thiab cov txheej txheem marine tseem ceeb uas yuav tsum tau muaj zog tshaj plaws - rau qhov hnyav piv.

Ob leeg CCS FQ47 thiab CCS FQ70 yog CCS- ntawv pov thawj quenched thiab tempered marine steels nrog tshwj xeeb qis- kub toughness kuaj ntawm -60 ° C, kom ntseeg tau tias kev ua tau zoo nyob rau hauv lub feem ntau huab Arctic thiab hnyav marine ib puag ncig. Lawv qhov sib txawv tseem ceeb nyob hauv qib siab: FQ47 muaj qhov tsawg kawg nkaus lub zog ntawm 460 MPa nrog lub zog tensile ntawm 570-720 MPa, haum rau siab - lub zog ntawm ntug dej hiav txwv platforms thiab cov dej khov hauv chav kawm, thaum FQ70 muab qhov muaj zog ntau dua qhov tawm los ntawm tensile zog ntawm 6070 MPa, ncav cuag 6070 MPa. rau qhov xav tau tshaj plaws load-bearing daim ntawv thov yuav tsum tau txo qhov hnyav tshaj plaws. Tsis tas li ntawd, FQ70 feem ntau muaj cov ntsiab lus qis tshaj plaws (0.18% vs. kwv yees li 0.21% rau FQ47), uas tuaj yeem muab kev txhim kho weldability rau kev tsim khoom tseem ceeb. Ob qib tshwj xeeb tswj cov tshuaj muaj pes tsawg leeg thiab tswj cov weldability zoo rau cov kev pabcuam marine tseem ceeb.

Tshuaj muaj pes tsawg leeg

Mechanical Property