商铺名称:山东聊城普华永道金属材料有限公司
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聊城市博润钢管专业生产经营φ10- 1200mm无缝钢管、φ10-2820mm直缝钢管。联系人:汪坤15069510010 www.gangguan169.com
钢管的承压问题一直是困扰广大钢管从业人员的细节性问题,每个人都能通过钢管压力壁厚对照表来比对钢管的承压能力,但具体到某一根钢管上来讲,这根钢管的承压能力到底有多大,这个问题就有点棘手了。因为通过对照表来查询,这只是最保守的方法,而且这个数据也不是完全正确,这些数据虽然也是通过大量的科学实验得出的,但它也只是一个大体数据并不绝对准确。因为钢管承压能力这个问题还要受工作环境中温度、内部流体、钢管生产流程等等一系列的问题所影响。如果在我们测算出钢管的外径、壁厚、钢管材质的抗拉强度的情况下,我们可以通过计算分式来计算钢管的承压能力,当然这里面涉及到的数据都是经过实际测算的准确的,且钢管材质的机械性能是有保证的。这样我们获取的数据就有了一定保证。
钢管承压能力和壁厚的计算公式:压力=(壁厚*2*钢管材质抗拉强度)/(外径*系数)
上面所提到的钢管压力系数不是一个固定的数值,它是要根据钢管的实际承压能力而变的。下面就是钢管压力系数的界定范围:当压力P<7Mpa 时,系数为S=8;当7<钢管压力P<17.5时, 系数为S=6;当压力P>17.5时, 系数为S=4。
(一)无缝钢管压力壁厚对照表
材质 |
PN MPa |
DN |
||||||||||||||||||||
10 |
15 |
20 |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
150 |
200 |
250 |
300 |
350 |
400 |
450 |
500 |
600 |
|||
20# |
≤1.6 |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
4 |
4 |
4 |
4 |
4.5 |
5 |
6 |
7 |
7 |
8 |
8 |
8 |
9 |
|
2.5 |
2.5 |
3 |
3 |
3 |
2 |
3.5 |
3.5 |
4 |
4 |
4 |
4 |
4.5 |
5 |
6 |
7 |
7 |
8 |
8 |
9 |
10 |
||
4.0 |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
4 |
4 |
4.5 |
5 |
5.5 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
15 |
||
6.4 |
3 |
3 |
3 |
3.5 |
3.5 |
3.5 |
4 |
4.5 |
5 |
6 |
7 |
8 |
9 |
11 |
12 |
14 |
16 |
17 |
19 |
22 |
||
10.0 |
3 |
3.5 |
3.5 |
4 |
4.5 |
4.5 |
5 |
6 |
7 |
8 |
9 |
10 |
13 |
15 |
18 |
20 |
22 |
|||||
16.0 |
4 |
4.5 |
5 |
5 |
6 |
6 |
7 |
8 |
9 |
11 |
13 |
15 |
19 |
24 |
26 |
30 |
34 |
|||||
20.0 |
4 |
4.5 |
5 |
6 |
6 |
7 |
8 |
9 |
11 |
13 |
15 |
18 |
22 |
28 |
32 |
36 |
||||||
4.0T |
3.5 |
4 |
4 |
4.5 |
5 |
5 |
5.5 |
|||||||||||||||
10# |
≤1.6 |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
4 |
4.5 |
4 |
4 |
4.5 |
5.5 |
7 |
7 |
8 |
8 |
8 |
8 |
9 |
|
2.5 |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
4 |
4.5 |
4 |
5 |
4.5 |
5.5 |
7 |
7 |
8 |
9 |
9 |
10 |
12 |
||
4.0 |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
4 |
4.5 |
5 |
5.5 |
6 |
8 |
9 |
10 |
11 |
12 |
14 |
15 |
18 |
||
6.4 |
3 |
3 |
3 |
3.5 |
4 |
4 |
4.5 |
5 |
5.5 |
7 |
8 |
9 |
11 |
13 |
14 |
16 |
18 |
20 |
22 |
26 |
||
10.0 |
3 |
3.5 |
4 |
4 |
4.5 |
5 |
5.5 |
7 |
8 |
9 |
10 |
12 |
15 |
18 |
22 |
24 |
26 |
|||||
16.0 |
4 |
4.5 |
5 |
5 |
6 |
7 |
8 |
9 |
10 |
12 |
15 |
18 |
22 |
28 |
32 |
36 |
40 |
|||||
20.0 |
4 |
4.5 |
5 |
6 |
7 |
8 |
9 |
11 |
12 |
15 |
18 |
22 |
26 |
34 |
38 |
|||||||
4.0T |
3.5 |
4 |
4 |
4.5 |
5 |
5 |
5.5 |
16Mn |
≤1.6 |
2.5 |
2.5 |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
3.5 |
3.5 |
4 |
4.5 |
5 |
5.5 |
6 |
6 |
6 |
6 |
7 |
|
2.5 |
2.5 |
2.5 |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
3.5 |
3.5 |
4 |
4.5 |
5 |
5.5 |
6 |
7 |
7 |
8 |
9 |
||
4.0 |
2.5 |
2.5 |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
4 |
4.5 |
5 |
6 |
7 |
8 |
8 |
9 |
10 |
11 |
12 |
||
6.4 |
2.5 |
3 |
3 |
3 |
3.5 |
3.5 |
3.5 |
4 |
4.5 |
5 |
6 |
7 |
8 |
9 |
11 |
12 |
13 |
14 |
16 |
18 |
||
10.0 |
3 |
3 |
3.5 |
3.5 |
4 |
4 |
4.5 |
5 |
6 |
7 |
8 |
9 |
11 |
13 |
15 |
17 |
19 |
|||||
16.0 |
3.5 |
3.5 |
4 |
4.5 |
5 |
5 |
6 |
7 |
8 |
9 |
11 |
12 |
16 |
19 |
22 |
25 |
28 |
|||||
20.0 |
3.5 |
4 |
4.5 |
5 |
5.5 |
6 |
7 |
8 |
9 |
11 |
13 |
15 |
19 |
24 |
26 |
30 |
(二)直缝焊管承受压力表
材料 |
PN MPa |
DN |
|||||||||||||||
200 |
250 |
300 |
350 |
400 |
450 |
500 |
600 |
700 |
800 |
900 |
1000 |
1100 |
1200 |
1400 |
1600 |
||
焊接碳钢管 (Q235A20) |
0.25 |
5 |
5 |
5 |
5 |
5 |
5 |
5 |
6 |
6 |
6 |
6 |
6 |
6 |
7 |
7 |
7 |
0.6 |
5 |
5 |
6 |
6 |
6 |
6 |
6 |
7 |
7 |
7 |
7 |
8 |
8 |
8 |
9 |
10 |
|
1.0 |
5 |
5 |
6 |
6 |
6 |
7 |
7 |
8 |
8 |
9 |
9 |
10 |
11 |
11 |
12 |
||
1.6 |
6 |
6 |
7 |
7 |
8 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
|||
2.5 |
7 |
8 |
9 |
9 |
10 |
11 |
12 |
13 |
15 |
16 |
|||||||
焊接不锈钢管 |
0.25 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
3.5 |
4 |
4 |
4 |
4.5 |
4.5 |
||||
0.6 |
3 |
3 |
3.5 |
3.5 |
3.5 |
4 |
4 |
4.5 |
5 |
5 |
6 |
6 |
|||||
1.0 |
3.5 |
3.5 |
4 |
4.5 |
4.5 |
5 |
5.5 |
6 |
7 |
7 |
8 |
||||||
1.6 |
4 |
4.5 |
5 |
6 |
6 |
7 |
7 |
8 |
9 |
10 |
|||||||
2.5 |
5 |
6 |
7 |
8 |
9 |
9 |
10 |
12 |
13 |
15 |
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