Annealing Recipe & Cooling Control
退火配方与冷却控制
标签：退火, 温度, 淬火, 软化, 加工硬化
紫铜退火约 500–600℃ 至暗樱桃红，银约 600–650℃，黄铜约 550–650℃。加热均匀后可在水中淬火快速软化（铜银适用），也可随炉缓冷。切忌局部过热——会出现过烧晶粒粗大。退火后酸洗（稀硫酸）去除氧化皮再继续起凸。
Anneal copper at ~500–600°C to a dull cherry red, silver ~600–650°C, brass ~550–650°C. Heat evenly then quench in water for rapid softening (copper/silver) or cool slowly. Never overheat locally — it causes burned, coarse grains. After annealing pickle in dilute sulphuric acid to remove scale before continuing. ---