| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength cast steel material for a structure having high strength and extensibility, and excellent in low temperature toughness and heating embrittlement property.SOLUTION: There is provided high strength cast steel material for a structure containing, by mass%, C:0.15 to 0.3%, Si:0.2 to 0.7%, Mn:0.4 to 1.2%, P:0.015% or less, S:0.015% or less, Ni:2 to 3%, Cr:0.1 to 0.5%, Mo:0.3 to 0.5%, V:0.05 to 0.15%, Ca:0.01 to 0.05% and the balance Fe with inevitable impurities and having contents of Ca and S, by mass%, satisfying a relationship of S×2≤Ca≤S×4 and contents C and V, by mass%, satisfying a relationship of C×0.3≤V≤C×0.6. |
