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为开发冰海的能源,采用多功能控制冷却工艺(MACS),大量而稳定地生产了耐苛刻环境条件、屈服强度σ_a为36kgf/mm~2高性能的大线能量焊接冰海构件用钢板(最大厚度为70mm),为确保板厚达70mm 时的强度,进而保证线能量为130kJ/cm 时焊缝韧性,采用添加微量铌的低碳当量(低 C_(eq))的成分系,取代过去的 Si-Mn 系。在母材强度方面,由于采用 MACS 处理,即便在低 C_(eq)情况下,也能充分满足σs36kgf/mm~2的要求。关于母材的韧性,板厚中心的横向(试样)在小于-80℃的温度下显示出50%的 FATT(断口转变温度).焊缝的韧性,在采用130kJ/cm 的大线能量双侧单层焊接时,其热影响区的任何部位的 vE-60值,都大于10kgf·m,效果良好.
For the development of ice sea energy, multi-functional control cooling process (MACS), a large number of stable and stable production of harsh environmental conditions, yield strength σ_a 36kgf / mm ~ 2 high-performance large-capacity welding ice sheet member The maximum thickness of 70mm), in order to ensure the strength of the plate thickness up to 70mm, thereby ensuring the line energy of 130kJ / cm when the weld toughness, the use of small amounts of niobium added to the low carbon equivalent (low C eq) Si-Mn system. As for the strength of the base metal, due to the MACS treatment, the requirement of σs36kgf / mm ~ 2 can be sufficiently satisfied even in the case of low C_ (eq). Regarding the toughness of the base metal, the transverse direction (sample) at the center of the sheet thickness showed a FATT (fracture transition temperature) of 50% at temperatures less than -80 ° C. The toughness of the weld was measured using a large line energy of 130 kJ / cm When the side single layer welding, the vE-60 value of any part of the heat affected zone is greater than 10kgf · m, the effect is good.