| 摘要 |
PROBLEM TO BE SOLVED: To favorably improve the characteristic of an HIC resistance by effectively eliminating not only center porosity but also center segregation in a continuously cast slab, even when the total draft is <=67%. SOLUTION: When a heating treatment is executed previously to a forging, the continuously cast slab is held at >=1200 deg.C for >=20 hr, and successively, after forging of at least 16% draft, the thick plate rolling is executed.
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