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16.9Ni-4Co-0.3C钢(厚76.2mm板材)(1)化学成分(%),见表16.1。(2)热处理工艺热处理采用844℃×2小时+538℃×2小时两次回火。(3)断裂韧性,见表16.2。
16.9Ni-4Co-0.3C steel (thickness 76.2mm plate) (1) Chemical composition (%), see Table 16.1. (2) heat treatment process heat treatment using 844 ℃ × 2 hours + 538 ℃ × 2 hours twice tempering. (3) Fracture toughness, see Table 16.2.