This article describes the composition and properties requirements of GRADE-A ship plate in according to A131/A131M-2001 Standard,by designing reasonable chemical component and gain effective rolling process,succeeds in satisfying mechanical properties ship plate.
The composition of CoAl was closer to Al than that of Co2Al5.In Mn/Al system,due to the adhesive energy of Al crystal was larger than that of Mn crystal,Mn atoms may diffuse into Al crystal,and the intermetallic compounds Mn5Al8,Mn22Al78,MnAl6 were formed. The quantity of MnAl6 was larger than others,and its composition was closer to that of Al.
The results show that under the appropriate neutralization condition and using two schemes according to the composition of leaching liquor,more than 95% Fe3+ have been eliminated and less than 0.5 mg/L Fe3+ have been left in leaching liquor,while more than 95% of Zn in neutralization agent can be leached out,and more than 95% of Cu can be turned into neutralization liquor and then can be recovered by latter process.
The contents of SiO2 and Al2O3 in inclusions were affected directly by the SiO2 and Al2O3 contents in refining slag, it was very remarkable when the slag composition was CaO·Al2O3· 2SiO2. Therefore, it's feasible to control the composition of inclusions by controlling the composition of refining slag.