<p style="text-indent:2em;"> <span style="font-family:Arial;">Tanzo&nbsp;(Forging)&nbsp;literally&nbsp;means&nbsp;to&nbsp;strengthen&nbsp;and&nbsp;make.&nbsp;Strike&nbsp;the&nbsp;iron&nbsp;when&nbsp;it&nbsp;is&nbsp;still&nbsp;hot;&nbsp;this&nbsp;proverb&nbsp;is&nbsp;used&nbsp;in&nbsp;education&nbsp;for&nbsp;young&nbsp;people.&nbsp;You&nbsp;heat&nbsp;and&nbsp;strike&nbsp;iron,&nbsp;in&nbsp;order&nbsp;to&nbsp;form&nbsp;the&nbsp;iron&nbsp;into&nbsp;a&nbsp;required&nbsp;shape.&nbsp;When&nbsp;a&nbsp;heated&nbsp;solid&nbsp;metal&nbsp;blank&nbsp;is&nbsp;wrought,&nbsp;its&nbsp;crystal&nbsp;grains&nbsp;are&nbsp;made&nbsp;fine&nbsp;and&nbsp;its&nbsp;structure,&nbsp;improved.&nbsp;While&nbsp;the&nbsp;mechanical&nbsp;properties&nbsp;are&nbsp;improved,&nbsp;the&nbsp;solid&nbsp;metal&nbsp;blank&nbsp;can&nbsp;be&nbsp;formed&nbsp;into&nbsp;a&nbsp;required&nbsp;shape.&nbsp;Thus,&nbsp;some&nbsp;machining&nbsp;process&nbsp;can&nbsp;be&nbsp;skipped,&nbsp;and&nbsp;as&nbsp;a&nbsp;result,&nbsp;the&nbsp;machining&nbsp;hours&nbsp;can&nbsp;be&nbsp;reduced.&nbsp;This&nbsp;is&nbsp;what&nbsp;Tanzo&nbsp;is&nbsp;about.</span> </p> <p style="text-indent:2em;"> <span style="font-family:Arial;">Processed&nbsp;steel&nbsp;products&nbsp;are&nbsp;made&nbsp;by&nbsp;machining&nbsp;rolled&nbsp;steel;&nbsp;therefore,&nbsp;the&nbsp;fabrication&nbsp;yield&nbsp;ratio&nbsp;is&nbsp;very&nbsp;low.&nbsp;As&nbsp;foundry&nbsp;pieces&nbsp;are&nbsp;made&nbsp;by&nbsp;pouring&nbsp;melted&nbsp;steel&nbsp;into&nbsp;molds,&nbsp;the&nbsp;compositions&nbsp;of&nbsp;the&nbsp;products&nbsp;vary&nbsp;and&nbsp;they&nbsp;are&nbsp;prone&nbsp;to&nbsp;incidental&nbsp;inclusions.&nbsp;It&nbsp;is&nbsp;another&nbsp;characteristic&nbsp;of&nbsp;foundry&nbsp;that&nbsp;the&nbsp;products&nbsp;cannot&nbsp;withstand&nbsp;a&nbsp;strong&nbsp;impact.&nbsp;On&nbsp;the&nbsp;other&nbsp;hand,&nbsp;forging&nbsp;is&nbsp;a&nbsp;technology&nbsp;to&nbsp;fabricate&nbsp;products&nbsp;of&nbsp;complicated&nbsp;shapes&nbsp;while&nbsp;increasing&nbsp;the&nbsp;strength&nbsp;of&nbsp;the&nbsp;products&nbsp;by&nbsp;the&nbsp;wrought&nbsp;steel.</span> </p>