I was ready to post a technical question but unfortunately (or fortunately ?) Gary Wood closed discussion before. So having Hapur like a member here, I guess this is the right place to post the question :
Antonio Scapini said :
"Porosity is made by casting or struck process !..Both metals are casted at the beginning! Is the second work (to make them become rings!) that give them their density! "
Antonio forgets (on purpose ?) that Hapur prepare blank bar by rolling mill and that has an influence on porosity (or density ?) :
