STELL BAR FOR PRESTRESSED CONCRETE EXCELLENT IN DELAYED FRACTURE RESISTANCE AT WELD ZONE.

摘要

A STEEL BAR FOR PRESTRESSED CONCRETE EXCELLENT IN DELAYED FRACTUR RESISTANCE AT A WELD ZONE, WHICH CONSISTS ESSENTIALLY OF: CARBON(C) : FROM 0.2 TO 0.6 WT.%, SILICON (SI) : FROM 0.2 TO 2.0 WT.%, MANGANESE (MN) : FROM 0.2 TO 2.0 WT.%, NICKEL (NI) : FROM 0.25 TO UNDER 0.8 WT.%, AND THE BALANCE BEING IRON (FE) AND INCIDENTAL IMPURITIES, WHERE, THE CONTENTS OF PHOSPHORUS (P) AND SULFUR (S) AS THE INCIDENTAL IMPURITIES BEING, RESPECTIVELY: UP TO 0.020 WT.% FOR PHOSPHORUS, AND UP TO 0'.015 WT.% FOR SULFUR. THE ABOVE-MENTIONED STEEL BAR MAY ADDITIONALLY CONTAIN AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF: CHROMIUM (CR) : FROM 0.3 TO 2.0 WT.%, MOLYBDENUM (MO) : FROM 0.1 TO 0.5 WT.%, COPPER (CU) : FROM 0.05 TO 1.0 WT.%, BORON (B) : FROM 0.0003 TO 0.0050 WT.%, AND TUNGSTEN (W) : FROM 0.03 TO 0.50 WT.%.