The differences of the sheath wrepping index, the index of lodging resistant and the physical intension of stem between twoline super hybrid rice Pei′ai 64S/E32 and 3line hybrid rice Shanyou 63 are studied.

Experiments on electrogas welding of EH36 high strength hull plate;

The study and test of rolling technology were carried out because the strain-age impact toughness of D grade hull plate could not meet the standard by conventional rolling technology.

EGW experiment for EH36 hull plates is carried on.

Through the research on the process of high strength heavy ship plate DH36,the suitable component design,technology of controlling rolling and cooling were used to improve its combined mechanical property.

Since baosteel plate mill put into production,material flow of the whole production-line always block the acceleration of the producing efficiency,due to some special requirements,such as small batch,variable steel grade,and needs inspection,the material flow problem of the ship plate production play a critical important role in the whole process.

Through studying the practice of control rolling and cooling technology of A36, DH36 steel plate which has well and steadily comprehensive function of mechnics, it sucessfullly produces hing strength ship plate with control rolling and cooling technology instead of normalizing technology.

The measures of improving shipbuilding plate quality and its effects;