| 摘要 |
PURPOSE:To obtain a titled slab effectively while averting burning phenomena by subjecting the slab of martensitic stainless steel produced in a continuous casting installation to heat treatments at temp. higher than the eutectic temp. thereof, under the specific temp. and time conditions while the slab is held supported. CONSTITUTION:The slab of martensitic stainless steel obtd. in a continuous casting installation is subjected to heat treatments at temp. higher than the eutectic temp. thereof, under the temp. and time conditions satisfying the equation[t is a holding time (hr), theta is the temp. of the slab ( deg.C)]and in the stage in which the weight of the slab is supported by the entire surface of the broad surface of the slab. Here, it is essential to obtain the slab with the continuous casting instalation and such slab contains less eutectic carbides in the surface layer parts. The equation is found empirically, wherein the theta is set higher than the eutectic temp., but if said temp. is too high, the deformation of the slab itself and the formation of scale are of problem; therefore, the preferable upper limit thereof is (eutectic temp. +180 deg.C). Since the treatments are accomplished at high temp. for a long time, the slab is supported in the above-mentioned way to prevent the difficulty in charging of the slab into a continuous heating furnace on account of creep deformation. |
