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1 前言 为了适应建筑物的高层化和大跨度化,需要高强度厚壁钢材作建筑立柱。在东京晴海和大阪堂岛的开发中,希望使用以SN490级为主的超厚H型钢2万t以上;在材质方面,因在阪神、淡路大地震中,用槽钢焊成的箱形立柱母材和焊接部都产生厂脆性断裂。因而作为立柱材料使用的超厚H型钢母材部和焊接部的韧性要求就高。 在此状态下,在生产工艺方面,开发了由连铸坯成形轧制法和以现有轧机最大限度控轧效果的新控冷法;在材质方面,则开发了以在再结晶区域轧制为前提的形变热处理(下简称“TMCP”)条件下的合金设计、材质控制法。综合以上技术,进行了TMCP型高韧性超厚H型钢的开发(其目标是使母材及焊接部的vTs≤—10℃)。
1 Introduction In order to adapt to the tall buildings and large-span buildings, the need for high-strength thick-walled steel building columns. In the development of Tokyo’s Ching Hai and Osaka Tong Island, it is hoped to use more than 20,000 t of ultra-thick H-section steel, which is mainly based on the SN490 grade. In terms of materials, in the Hanshin-Awaji Earthquake, box columns welded with channel steel Basematerials and welds all produce brittle fracture. Therefore, as a pillar material used in the thick H-beam base metal part and the Ministry of toughness requirements. In this state, in the production process, developed by the continuous casting billet forming rolling method and the existing rolling mill maximum controlled rolling effect of the new controlled cooling method; in the material, then developed in the recrystallization region rolling As the premise of the deformation heat treatment (hereinafter referred to as “TMCP”) under the conditions of alloy design, material control method. Based on the above techniques, TMCP high toughness H-section steels have been developed (with the aim of making the vTs of the base metal and the weld zone ≤-10 ° C).