| 摘要 |
PURPOSE:To efficiently manufacture the titled steel plate at a low cost by adding a very small amount of B to a low carbon steel with a restricted N content and hot rolling the steel at a specified finish temp. CONSTITUTION:A steel consisting of <=0.010% C, <=0.30% Si, 0.05-0.30% Mn, <=0.070% sol. Al, <=0.0050% N, 0.0010-0.0050% B and the balance essentially Fe or further contg. 0.001-0.100% one or more among Ti, Nb, Zr as required and V is hot rolled at 850-900 deg.C finish temp. and coiled. It is then cold rolled at >=60% draft, annealed at the recrystallization temp. -<= the A3 transformation point, and galvanized. |
