中所列熱處理溫度允許調整范圍：淬火±20°C，低溫回火±30°C，高溫回火±50°C。 2.硼鋼在淬火前可先正火，鉻錳鈦鋼{dy}次淬火可用正火代替。 3.對壁厚不大于5mm的鋼管不做布氏硬度試驗。 ①可按其中一種數據交貨。 ②于280-320°C等溫淬火。 (4)用途 適用于一般結構、機械結構 3.結構用不銹鋼無縫鋼管（GB／T14975—1994） (1)尺寸規格 結構用不銹鋼熱軋(擠、擴)無縫鋼管的尺寸規格(mm) 外徑 壁厚 4.5 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 22 24 25 26 28 68 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 70 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 73 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 76 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 80 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 83 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 89 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 95 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 102 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 108 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 114 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 121 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 127 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 133 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 140 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 146 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 152 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 159 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 168 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 180 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 194 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 219 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 245 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 237 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 325 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 351 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎