Annealed condition: heat to 830 °C followed by slow cooling.( ]3 _+ l) k; D3 |- w0 t
退火:加热到830℃,缓慢冷却。( ~4 c) g/ A* s- v& k/ w
- Brinell Hardness: 170+ Q$ [$ _3 g! j8 S* f7 l3 G
• Oil quench from 980 °C.(或空冷) Temper at 690 °C. ) n5 u3 D R5 _5 G0 ^油淬980℃,回火690℃