中所列热处理温度允许调整范围：淬火±20°C，低温回火±30°C，高温回火±50°C。
2.硼钢在淬火前可先正火，铬锰钛钢{dy}次淬火可用正火代替。
3.对壁厚不大于5mm的钢管不做布氏硬度试验。
①可按其中一种数据交货。
②于280-320°C等温淬火。
(4)用途
适用于一般结构、机械结构
3.结构用不锈钢无缝钢管（GB／T14975—1994）
(1)尺寸规格
结构用不锈钢热轧(挤、扩)无缝钢管的尺寸规格(mm)
外径 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 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎
