Hauv kev lag luam maritime, steel daim hlau ua lub luag haujlwm tseem ceeb hauv kev ua kom muaj kev ncaj ncees thiab kev nyab xeeb ntawm cov nkoj. Ntawm cov qib sib txawv ntawm cov hlau phaj muaj, BV D420 marine steel daim hlau sawv tawm rau lawv qhov kev ua tau zoo tshwj xeeb hauv thaj chaw hnyav marine. Cov qhab nia no tshwj xeeb tsim los ua kom tau raws li cov qauv nruj uas tau teev tseg los ntawm kev faib cov koom haum xws li Bureau Veritas (BV) rau kev siv hauv nkoj tsim.
BV D420 ntxiv High Strength Chemical Composition Tempering thiab Quenching | |||||||
Qib | Cov ntsiab lus Max (%) | ||||||
C | Si | Mn | P | S | Al (min) | N | |
BV D420 | 0.20 | 0.55 | 1.70 | 0.030 | 0.030 | 0.015 | 0.020 |
Crack Sensitivity: Pcm=(C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+}Mo/15+V/10+5B)%
Carbon sib npaug: Ceq=【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
BV D420 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 D420 | Min Mpa | Mpa | Tsawg% | -20 | J | J |
420 | 530-680 | 18% | 28 | 42 | ||
Lus Cim: Lub Zog 1 yog qhov kev ntsuas cuam tshuam, Lub Zog 2 yog qhov ntev | ||||||
Kev ntsuam xyuas cuam tshuam yog ib feem tseem ceeb ntawm cov txheej txheem tswj kom zoo rau cov hlau phaj no. Qhov kev sim no suav nrog kev xa cov hlau mus rau qis - qhov kub thiab txias cuam tshuam rau kev ntsuas nws qhov tawv thiab tiv thaiv kev tawg. BV D420 steel daim hlau yog tsim los ua kom tau raws li cov qauv kev ntsuam xyuas nruj, kom ntseeg tau tias lawv muaj kev ntseeg siab hauv cov xwm txheej hnyav.
Cov kev siv tseem ceeb ntawm BV D420 steel daim hlau yog nyob rau hauv kev tsim cov nkoj thiab cov qauv hauv hiav txwv. Cov phaj no tau siv dav hauv cov nkoj thauj khoom, cov nkoj thauj neeg caij nkoj, thiab lwm hom nkoj nkoj. Lawv zoo heev corrosion kuj thiab lub zog siab ua rau lawv zoo tagnrho rau siv nyob rau hauv cov dej ntsev ib puag ncig, qhov chaw uas lawv raug cov dej tsis tu ncua thiab corrosive hais.
