Using metallurgical structure observation and measurement of mechanical properties such as micro-hardness,tensile test,cold-bend,the effect of Nb,Mo and Ti on the structure and mechanical properties of 700MPa weatheri...Using metallurgical structure observation and measurement of mechanical properties such as micro-hardness,tensile test,cold-bend,the effect of Nb,Mo and Ti on the structure and mechanical properties of 700MPa weathering steel was studied under the same rolling conditions.The results show the formation of M/A is promoted by Mo,while inhibited by Ti.Furthermore,M/A island,as a hard phase,is harm to the material toughness and plasticity;high M/A island fraction will result in obvious crack during cold bending.The effect of Nb on increasing the strength of experiment steel is very important.The Nb content of 700MPa steel must be higher than 0.05% to ensure the strength.The optimal mechanical properties of the experiment steel will be gained by the proper match ratio of Nb,Mo and Ti.The industry trial production of 700MPa high-strength weathering steel for container was also developed.展开更多
文摘Using metallurgical structure observation and measurement of mechanical properties such as micro-hardness,tensile test,cold-bend,the effect of Nb,Mo and Ti on the structure and mechanical properties of 700MPa weathering steel was studied under the same rolling conditions.The results show the formation of M/A is promoted by Mo,while inhibited by Ti.Furthermore,M/A island,as a hard phase,is harm to the material toughness and plasticity;high M/A island fraction will result in obvious crack during cold bending.The effect of Nb on increasing the strength of experiment steel is very important.The Nb content of 700MPa steel must be higher than 0.05% to ensure the strength.The optimal mechanical properties of the experiment steel will be gained by the proper match ratio of Nb,Mo and Ti.The industry trial production of 700MPa high-strength weathering steel for container was also developed.
