无缝钢管多少钱一吨？那么在生产无缝钢管时还要知道哪些必要知识呢？下面一共列出了八项，如下所示：
1）钢管公称外径为88.9mm，公称壁厚为6.45mm。
2） 钢管的外径和壁厚允许偏差其外径允许偏差：+ 0.50mm－0.20m；壁厚允许偏差：+ 0.97mm －0.77mm；钢管的通常长度为：9400mm～9750mm。
3） 钢管的弯曲度不得大于1.0mm/m。
4） 钢管两端端面应与钢管轴线垂直，切口毛刺应予清除。
5）钢管按实际重量交货，亦可按理论重量交货。钢管每米理论重量为13.115kg/m。
6）钢管的成品化学成分允许偏差应符合GB/T 222的有关规定。
7）交货状态：钢管以热轧状态交货。
8）力学性能：经适当热处理，20号无缝钢管的力学性能应达到API SPEC 5CT 中N80钢级的要求。
下面先来看看无缝钢管规格重量表，无缝钢管多少钱一吨如下所示：
|
单位Kg/m |
壁 厚 |
||||||
|
外 径 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
6 |
|
32 |
2.146 |
2.460 |
2.762 |
3.052 |
3.329 |
3.594 |
3.847 |
|
38 |
2.589 |
2.978 |
3.354 |
3.718 |
4.069 |
4.408 |
4.735 |
|
42 |
2.885 |
3.323 |
3.749 |
4.162 |
4.562 |
4.951 |
5.327 |
|
45 |
3.107 |
3.582 |
4.044 |
4.495 |
4.932 |
5.358 |
5.771 |
|
50 |
3.477 |
4.014 |
4.538 |
5.049 |
5.549 |
6.036 |
6.511 |
|
54 |
3.773 |
4.359 |
4.932 |
5.493 |
6.042 |
6.578 |
7.103 |
|
57 |
3.995 |
4.618 |
5.228 |
5.826 |
6.412 |
6.985 |
7.546 |
|
60 |
4.217 |
4.877 |
5.524 |
6.159 |
6.782 |
7.392 |
7.990 |
|
63.5 |
4.476 |
5.179 |
5.869 |
6.548 |
7.214 |
7.867 |
8.508 |
|
68 |
4.809 |
5.567 |
6.313 |
7.047 |
7.768 |
8.477 |
9.174 |
|
70 |
4.957 |
5.740 |
6.511 |
7.269 |
8.015 |
8.749 |
9.470 |
|
73 |
5.179 |
5.999 |
6.807 |
7.602 |
8.385 |
9.156 |
9.914 |
|
76 |
5.401 |
6.258 |
7.103 |
7.935 |
8.755 |
9.563 |
10.358 |
|
89 |
6.363 |
7.380 |
8.385 |
9.378 |
10.358 |
11.326 |
12.281 |
|
108 |
7.768 |
9.020 |
10.259 |
11.486 |
12.701 |
13.903 |
15.093 |
|
133 |
11.178 |
12.725 |
14.261 |
15.783 |
17.294 |
18.792 |
|
|
159 |
13.422 |
15.290 |
17.146 |
18.989 |
20.821 |
22.639 |
|
|
219 |
18.601 |
21.209 |
23.805 |
26.388 |
28.959 |
31.517 |
|
|
273 |
23.262 |
26.536 |
29.797 |
33.046 |
36.283 |
39.508 |
|
|
325 |
27.750 |
31.665 |
35.568 |
39.458 |
43.337 |
47.202 |
|
|
355 |
38.897 |
43.158 |
47.406 |
51.641 |
|
|
|
|
377 |
41.339 |
45.871 |
50.390 |
54.897 |
|
|
|
|
426 |
46.777 |
51.913 |
57.036 |
62.147 |
|
|
|
|
单位：g/m |
壁 厚 |
||||||
|
外 径 |
6.5 |
7 |
8 |
8.5 |
9 |
10 |
12 |
|
32 |
4.088 |
|
|
|
|
|
|
|
38 |
5.049 |
|
|
|
|
|
|
|
42 |
5.691 |
|
|
|
|
|
|
|
45 |
6.172 |
|
|
|
|
|
|
|
50 |
6.973 |
7.423 |
8.286 |
8.699 |
|
|
|
|
54 |
7.614 |
8.114 |
9.075 |
9.538 |
|
|
|
|
57 |
8.095 |
8.632 |
9.667 |
10.167 |
|
|
|
|
60 |
8.576 |
9.149 |
10.259 |
10.796 |
|
|
|
|
63.5 |
9.137 |
9.754 |
10.950 |
11.529 |
|
|
|
|
68 |
9.858 |
10.530 |
11.838 |
12.473 |
|
|
|
|
70 |
10.179 |
10.876 |
12.232 |
12.892 |
13.539 |
14.797 |
17.164 |
|
73 |
10.660 |
11.394 |
12.824 |
13.521 |
14.205 |
15.537 |
18.052 |
|
76 |
11.141 |
11.912 |
13.416 |
14.150 |
14.871 |
16.277 |
18.940 |
|
89 |
13.225 |
14.156 |
15.981 |
16.875 |
17.756 |
19.483 |
22.787 |
|
108 |
16.270 |
17.436 |
19.729 |
20.858 |
21.973 |
24.168 |
28.410 |
|
133 |
20.278 |
21.751 |
24.662 |
26.098 |
27.522 |
30.334 |
35.809 |
|
159 |
24.446 |
26.240 |
29.791 |
31.548 |
33.293 |
36.746 |
43.503 |
|
219 |
34.064 |
36.598 |
41.629 |
44.126 |
46.610 |
51.543 |
61.259 |
|
273 |
42.720 |
45.920 |
52.283 |
55.445 |
58.596 |
64.860 |
77.240 |
|
325 |
51.056 |
54.897 |
62.542 |
66.346 |
70.137 |
77.684 |
92.629 |
|
355 |
55.865 |
60.076 |
68.460 |
72.634 |
76.796 |
85.082 |
101.507 |
|
377 |
59.391 |
63.873 |
72.801 |
77.246 |
81.679 |
90.508 |
108.018 |
|
426 |
67.246 |
72.332 |
82.468 |
87.518 |
92.555 |
102.592 |
122.519 |
|
450 |
71.093 |
76.475 |
87.203 |
92.549 |
97.882 |
108.511 |
129.621 |
|
480 |
75.902 |
81.654 |
93.122 |
98.837 |
104.540 |
115.909 |
138.499 |
|
530 |
83.917 |
90.286 |
102.987 |
109.319 |
115.638 |
128.240 |
153.296 |
|
630 |
99.947 |
107.549 |
122.716 |
130.281 |
137.833 |
152.902 |
182.890 |
有了以上规格，但必须还得要知道无缝钢管计算公式和每吨的价格才可以算出无缝钢管多少钱一吨。公式是：【（外径-壁厚）】*壁厚*0.024666*单价=kg/米。例如无缝管219*7mm价格在4200元/吨，那它多少钱一米呢？
利用公式（219-7）*7*0.02466*4200/1000=4856（kg/米），我们通常在结算价格是都是以吨位来计量，那4856/1000=4.856元/吨。所以，无缝219*7mm一米的价格是4.856元/吨。