| ■■■■■■■■■■■■■■■■■■■■ KAWASAKI STEEL TECHNICAL REPORT No.3 ( September 1981 ) ■■■■■■■■■■■■■■■■■■■■ |
| Development of Hollow Steel Ingot for Large Forgings Yoshiharu Iida, Takemi Yamamoto, Jun-ichi Matsuno, Shigeyoshi Yamaura, Kazuo Aso |
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Synopsis : Forging Plant at Mizhushima Works of the Kawasaki Steel Corporation is unique in the world, for its use of BOF steel as forging material. The ingot is, therefore, best used for forgings for pressure vessels, because of the lower content of impurities such as Cu, As, Sb and Sn and its low susceptibility to temper embrittlement. In addition, the hollow steel ingot we have developed is the best for forged shell for pressure vessels. The hollow ingot is advantageous for its less segregation, small micro-porosity, clean internal surface, and little anisotropy in the mechanical properties. It also has economical merits, such as the higher forging yield resulting from the hollow shape of the ingot. Based on such quality and economical merits, together with the advantages of using BOF steel, hollow ingots weighing up to 200t for forgings are manufactured, and are popular among vessel manufacturers. |
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