公开(公告)号：US3810793A

公开(公告)日：1974-05-14

申请号：US26466972

申请日：1972-06-20

申请人： KRUPP AG HUETTENWERKE

发明人： HELLER W

IPC分类号： C21D8/08 ,  C21D7/02 ,  C21D7/14

CPC分类号： C21D8/08

摘要： A PROCESS FOR MANUFACTURING AN UNANNEALED REINFORCING BAR STEEL FOR PRESTRESSED CONCRETE WHICH COMPRISES SUBJECTING A STEEL HAVING A COMPOSITION OF: 0.20-0.35 WEIGHT PERCENT CARBON 0.20-2.50 WEIGHT PERCENT SILICON 0.50-3.50 WEIGHT PERCENT MANGANESE 1.25-4.50 WEIGHT PERCENT CHROMIUM (MN+CR)=2.75-5.00 WEIGHT PERCENT, THE BALANCE CONSISTING ESSENTIALLY OF IRON BY COOLING IT IN QUIET AIR FROM THE HOT-ROLLED STATE WITH THE FORMATION OF BAINITE STRUCTURE AND, THEREAFTER, EITHER COLD DEFORMING IT PLASTICALLY WITHOUT ESSENTIAL INCREASE OF TENSILE STRENGTH AND TEMPERING THE SAME AT A TEMPERATURE IN THE RANGE OF 100 TO 400* C. OR TEMPERING IT IN THE TEMPERATURE RANGE BETWEEN 150 AND 550* C.