| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.42 ( May 2000 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Heavy Gauge "RIVER TOUGH" H-Shapes
of the New TMCP Type for Building Structures Tatsumi Kimura, Takanori Okui, Kiyoshi Uchida |
| Synopsis: The new TMCP (thermo-mechanical control process) method is a process to enhance ferrite nucleation by using VN precipitates to refine the microstructure, and it is an integrated control method of microstructures applicable to the rolling of the heavy gauge H-shapes, to which the restrictive conditions of rolling, including the cooling process should be ensured. As a result of applying the new TMCP method to 355 MPa class heavy gauge H-shape with dimensions of 612~ 500~ 50~ 80 mm, its microstructure was remarkably refined, giving high strength and excellent toughness. The full-scale loading tests, carried out on a column-beam structure, in which a column consisted of this newly developed heavy gauge H-shape, proved that the column has sufficient deformation capacity and was verified as a safe material for high-rise buildings. The heavy gauge H-shapes, under the bland names of RIVER TOUGH 325 and 355, which satisfy SN490CTMC and SM520CTMC of the JIS grades, have been in production with flange thickness up to 80 mm. |
| TextiPDF: 8P/396kbj |