中所列熱處理溫度允許調(diào)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(duì)壁厚不大于5mm的鋼管不做布氏硬度試驗(yàn)。
①可按其中一種數(shù)據(jù)交貨。
②于280-320°C等溫淬火。
(4)用途
適用于一般結(jié)構(gòu)、機(jī)械結(jié)構(gòu)
3.結(jié)構(gòu)用不銹鋼無縫鋼管（GB／T14975—1994）
(1)尺寸規(guī)格
結(jié)構(gòu)用不銹鋼熱軋(擠、擴(kuò))無縫鋼管的尺寸規(guī)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 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎
