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1.热轧圆钢和方钢（GB／T702-1986）
热轧圆钢和方钢的尺寸规格
直径d
(或边长a)
／mm
|
精度组别
|
|
截面面积／cm²
|
理论质量(kg／m)
|
|
1组
|
2组
|
3组
|
|
圆 钢
|
方 钢
|
圆 钢
|
方 钢
|
|
允许偏差／mm
|
|
5.5
|
±0.20
|
±0.30
|
±0.40
|
..2375
|
0.30
|
0.186
|
0.237
|
|
6
|
0.2827
|
0.36
|
0.222
|
0.283
|
|
6.5
|
0.3318
|
0.42
|
0.260
|
0.332
|
|
7
|
0.3848
|
0.49
|
0.302
|
0.385
|
|
8
|
±0.25
|
±0.35
|
±0.40
|
0.5077
|
0.64
|
0.395
|
0.502
|
|
9
|
0.6362
|
0.81
|
0.499
|
0.636
|
|
10
|
0.7854
|
1.0
|
0.617
|
0.785
|
|
*11
|
0.9503
|
1.21
|
0.746
|
0.95
|
|
12
|
1.131
|
1.44
|
0.888
|
1.13
|
|
13
|
1.327
|
1.69
|
1.04
|
1.33
|
|
14
|
1.539
|
1.96
|
1.21
|
1.54
|
|
15
|
1.767
|
2.25
|
1.39
|
1.77
|
|
16
|
2.011
|
2.56
|
1.58
|
2.01
|
|
17
|
2.270
|
2.89
|
1.78
|
2.27
|
|
18
|
2.545
|
3.24
|
2.00
|
2.54
|
|
19
|
2.835
|
3.61
|
2.23
|
2.83
|
|
20
|
3.142
|
4.00
|
2.47
|
3.14
|
|
21
|
±. 30
|
±. 40
|
±. 50
|
3.464
|
4.41
|
2.72
|
3.46
|
|
22
|
3.801
|
4.84
|
2.98
|
3.80
|
|
*23
|
4.155
|
5.29
|
3.26
|
4.15
|
|
24
|
4.524
|
5.76
|
3.55
|
4.52
|
|
25
|
4.909
|
6.25
|
3.85
|
4.91
|
|
26
|
5.309
|
6.76
|
4.17
|
5.31
|
|
*27
|
5.726
|
7.29
|
4.49
|
5.72
|
|
28
|
6.158
|
7.84
|
4.83
|
6.15
|
|
*29
|
6.605
|
8.41
|
5.18
|
6.60
|
|
30
|
7.069
|
9.00
|
5.55
|
7.06
|
|
*31
|
±0.40
|
±0.50
|
±0.60
|
7.548
|
9.61
|
5.93
|
7.54
|
|
32
|
8.042
|
10.24
|
6.31
|
8.04
|
|
*33
|
8.553
|
10.89
|
6.71
|
8.55
|
|
34
|
9.097
|
11.56
|
7.13
|
9.07
|
|
*35
|
9.621
|
12.25
|
7.55
|
9.62
|
|
36
|
10.18
|
12.96
|
7.99
|
10.2
|
|
38
|
11.34
|
14.44
|
8.90
|
11.3
|
|
40
|
12.57
|
16.00
|
9.86
|
12.6
|
|
42
|
13.85
|
17.64
|
10.9
|
13.8
|
|
45
|
15.90
|
20.25
|
12.5
|
15.9
|
|
48
|
18.10
|
23.04
|
14.2
|
18.1
|
|
50
|
19.64
|
25.00
|
15.4
|
19.6
|
|
53
|
±0.60
|
±. 70
|
±0.80
|
22.06
|
28.09
|
17.3
|
22..
|
|
*55
|
23.76
|
30.25
|
18.6
|
23.7
|
|
56
|
24.63
|
31.36
|
19.3
|
24.6
|
|
*58
|
26.42
|
33.64
|
20.7
|
26.4
|
|
60
|
±. 60
|
±. 70
|
±0.80
|
28.27
|
36.00
|
22.2
|
28.3
|
|
63
|
31.17
|
39.69
|
24.5
|
31.2
|
|
*65
|
33.18
|
42.25
|
26..
|
33.2
|
|
*68
|
36.32
|
46.24
|
28.5
|
36.3
|
|
70
|
38.48
|
49.00
|
30.2
|
38.5
|
|
75
|
44.18
|
56.25
|
34.7
|
44.2
|
|
80
|
50.27
|
64.00
|
39.5
|
50.2
|
|
85
|
±. 9
|
±1.0
|
±1.1
|
56.75
|
72.25
|
44.5
|
56.7
|
|
90
|
63.62
|
81.00
|
49.9
|
63.6
|
|
95
|
70.88
|
90.25
|
55.6
|
70.8
|
|
100
|
78.54
|
100.00
|
61.7
|
78.5
|
|
105
|
86.59
|
110.25
|
68.0
|
86.5
|
|
110
|
95.03
|
121.00
|
74.6
|
95.0
|
|
115
|
±1.2
|
±1.3
|
±1.4
|
103.82
|
132.26
|
81.5
|
104
|
|
120
|
113.10
|
144.00
|
88.8
|
113
|
|
125
|
122.72
|
156.25
|
96.3
|
123
|
|
130
|
132.73
|
169.00
|
104
|
133
|
|
140
|
153.94
|
196.00
|
121
|
154
|
|
150
|
176.72
|
225.00
|
139
|
177
|
|
160
|
-
|
-
|
±2.0
|
201.06
|
256.00
|
158
|
201
|
|
170
|
226.98
|
289.00
|
178
|
227
|
|
180
|
254.47
|
324.00
|
200
|
254
|
|
190
|
283.53
|
361.00
|
223
|
283
|
|
200
|
-
|
-
|
±2.5
|
314.16
|
400.00
|
247
|
314
|
|
220
|
380.13
|
-
|
298
|
-
|
|
250
|
490.88
|
-
|
385
|
-
|
|
注：1.表中的理论质量是按钢的密度为7.85g／crn3计算的。
2.表中带“*”号的规格，不推荐使用。
| 
放大图片
