圆钢 kg/m
P=0.00617×直径²
5	0.154
5.5	0.187
6	0.222
6.5	0.26
7	0.302
8	0.395
9	0.499
10	0.617
11	0.746
12	0.888
13	1.04
14	1.21
15	1.39
16	1.58
17	1.78
18	2
19	2.23
20	2.47
21	2.72
22	2.98
23	3.26
24	3.55
25	3.85
26	4.17
27	4.49
28	4.83
29	5.19
30	5.55
31	5.92
32	6.31
33	6.71
34	7.13
35	7.55
36	7.99
37	8.44
38	8.9
39	9.58
40	9.87
41	10.1
42	10.87
43	11.4
44	11.91
45	12.5
48	14.21
50	15.42
52	16.67
54	17.98
55	18.65
56	19.33
58	20.74
60	22.19
62	23.74
65	26.05
68	28.51
70	30.21
72	31.97
75	34.7
78	37.51
80	39.5
88	44.55
90	49.94
95	55.64
100	61.7
105	68
110	74.6
115	81.54
120	88.8
125	96.33
130	104.2
135	112.5
140	121
150	139
160	158
170	178.18
180	200
190	223
200	247
230	326.18
250	385.37
280	483.41
300	554.85
320	631.4
350	755.33
400	886.59