1.Introduced in this paper is how Chelyabinsk Steel Tube Works, Russia, produced hollow mandrel used by Pilger pipe mill by means of a new process (OHF melting-LF refining-continuous casting-electroslag remelting-forging-heat treatment-boring) and 20 Cr3 MnNVNb steel.
2.Thechange trend of equation 226Ra in structural material of Xinjiang is granite > color ceramic tile > marble > red brick > perlite > ceramic block > cement of 325 > hollow block > cement of 425> cement of 525 > water mill stone > white cement.
