| 摘要 |
PURPOSE:To manufacture economically a high tensile strength scalene and unequal thickness angle superior in weldability by hot rolling the hot rolled rough billet made from continuously cast slab having small carbon equivalent. CONSTITUTION:The continuously cast slab 8 containing 0.07-0.15% C, 0.15- 0.35% Si, 0.90-1.30% Mn, <=0.025% P, <=0.025% S, 0.010-0.035% Al, and having <=0.36% carbon equivalent expressed by C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+ V/14 is worked to the rough bloom 9 by rough rolling machine. In case <=900 deg.C whole section temp., the rolling of said billet is started by universal mill, finished at the time when the temp. is attained to 750+ or -40 deg.C, and cooled as a channel steel 10, then the shape is corrected. This is cut to two pieces and the high tensile strength scalene and unequal thickness angle 11, (11) superior in weldability is manufactured. |
