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BS 1387 Grade Carbon Steel Seamless Tubes, commonly recognized as mild steel pipes and tubes, represent a category of cost-effective low-carbon steel tubes. These tubes are characterized by a carbon content of up to 0.20% and a manganese content of up to 1.20%, endowing them with excellent formability and malleability. Manufactured in strict accordance with the BS (British Standard) specification, they are widely known in commercial circles as CS (carbon steel) pipes or MS (mild steel) pipes.
Notably, low-carbon steel pipes exhibit less inherent hardness compared to high-carbon steel pipes. However, their surface hardness can be enhanced through a process called carburizing, which diffuses carbon into the outer layer of the material. This combination of affordability, workability, and the potential for surface hardening makes BS 1387 Grade Tubes suitable for various applications requiring formable steel components.
BS 1387/85 Steel Tubes and Tubulars Stuitable for Screwing to BS 21 Pipe Threads
|
Series |
Nominal Size |
Outside Diameter |
Wall Thickness |
Mass of Black Tube |
||||||||||
|
Max |
Min |
Plain End |
Screwed and Socketed |
|||||||||||
|
· |
DN |
in |
mm |
in |
mm |
in |
mm |
Ib/ft |
kg/ft |
kg/m |
Ib/ft |
kg/ft |
kg/m |
|
|
Light |
1/2 |
15 |
0.841 |
21.4 |
0.825 |
21.0 |
0.080 |
2.0 |
0.636 |
0.289 |
0.947 |
0.646 |
0.293 |
0.956 |
|
3/4 |
20 |
1.059 |
26.9 |
1.041 |
26.4 |
0.090 |
2.3 |
0.927 |
0.421 |
1.38 |
0.954 |
0.433 |
1.39 |
|
|
1 |
25 |
1.328 |
33.8 |
1.309 |
33.2 |
0.104 |
2.6 |
1.330 |
0.604 |
1.98 |
1.360 |
0.617 |
2 |
|
|
11/4 |
32 |
1.670 |
42.5 |
1.650 |
41.9 |
0.104 |
2.6 |
1.710 |
0.774 |
2.54 |
1.750 |
0.794 |
2.57 |
|
|
11/2 |
40 |
1.903 |
48.4 |
1.882 |
47.8 |
0.116 |
2.9 |
2.170 |
0.985 |
3.23 |
2.220 |
1.010 |
3.27 |
|
|
2 |
50 |
2.370 |
60.2 |
2.347 |
59.6 |
0.116 |
2.9 |
2.740 |
1.240 |
4.08 |
2.810 |
1.270 |
4.15 |
|
|
21/2 |
65 |
2.991 |
76.0 |
2.960 |
75.2 |
0.126 |
3.2 |
3.840 |
1.740 |
5.71 |
3.980 |
1.810 |
5.83 |
|
|
3 |
80 |
3.491 |
88.7 |
3.460 |
87.9 |
0.126 |
3.2 |
4.520 |
2.050 |
6.72 |
4.490 |
2.130 |
6.89 |
|
|
4 |
100 |
4.481 |
113.9 |
4.450 |
113.0 |
0.142 |
3.6 |
6.550 |
2.970 |
9.75 |
6.840 |
3.100 |
10 |
|
|
Medium |
1/2 |
15 |
0.586 |
21.7 |
0.831 |
21.1 |
0.104 |
2.6 |
0.813 |
0.369 |
1.21 |
0.828 |
0.376 |
1.22 |
|
3/4 |
20 |
1.072 |
27.2 |
1.047 |
26.6 |
0.104 |
2.6 |
1.050 |
0.475 |
1.56 |
1.070 |
0.485 |
1.57 |
|
|
1 |
25 |
1.346 |
34.2 |
1.316 |
33.4 |
0.126 |
3.2 |
1.620 |
0.735 |
2.41 |
1.650 |
0.748 |
2.43 |
|
|
11/4 |
32 |
1.687 |
42.9 |
1.657 |
42.1 |
0.126 |
3.2 |
2.080 |
0.945 |
3.1 |
2.130 |
0.966 |
3.13 |
|
|
11/2 |
40 |
1.919 |
48.8 |
1.889 |
48.0 |
0.126 |
3.2 |
2.400 |
1.090 |
3.57 |
2.460 |
1.120 |
3.61 |
|
|
2 |
50 |
2.394 |
60.8 |
2.354 |
59.8 |
0.142 |
3.6 |
3.380 |
1.530 |
5.03 |
3.470 |
1.570 |
5.1 |
|
|
21/2 |
65 |
3.014 |
76.6 |
2.969 |
75.4 |
0.142 |
3.6 |
4.320 |
1.960 |
6.43 |
4.460 |
2.020 |
6.55 |
|
|
3 |
80 |
3.524 |
89.5 |
3.469 |
88.1 |
0.157 |
4.0 |
5.620 |
2.550 |
8.37 |
5.800 |
2.630 |
8.54 |
|
|
4 |
100 |
4.524 |
114.9 |
4.459 |
113.3 |
0.177 |
4.5 |
8.200 |
3.720 |
12.2 |
8.340 |
3.780 |
12.5 |
|
|
5 |
125 |
5.534 |
140.6 |
5.549 |
138.7 |
0.196 |
5.0 |
11.15 |
5.060 |
16.6 |
11.20 |
5.080 |
17.1 |
|
|
6 |
150 |
6.539 |
166.1 |
6.459 |
164.1 |
0.196 |
5.0 |
13.24 |
6.000 |
19.7 |
13.30 |
6.030 |
20.3 |
|
|
Heavy |
1/2 |
15 |
0.856 |
21.7 |
0.831 |
21.1 |
0.126 |
3.2 |
0.968 |
0.439 |
1.44 |
0.983 |
0.446 |
1.45 |
|
3/4 |
20 |
1.072 |
27.2 |
1.047 |
26.6 |
0.126 |
3.2 |
1.260 |
0.570 |
1.87 |
1.280 |
0.581 |
1.88 |
|
|
1 |
25 |
1.346 |
34.2 |
1.136 |
33.4 |
0.157 |
4.0 |
1.980 |
0.896 |
2.94 |
2.010 |
0.912 |
2.96 |
|
|
11/4 |
32 |
1.687 |
42.9 |
1.657 |
42.1 |
0.157 |
4.0 |
2.550 |
1.160 |
3.8 |
2.600 |
1.180 |
3.83 |
|
|
11/2 |
40 |
1.919 |
48.8 |
1.889 |
48.0 |
0.157 |
4.0 |
2.940 |
1.340 |
4.38 |
3.010 |
1.370 |
4.42 |
|
|
2 |
50 |
2.394 |
60.8 |
2.354 |
59.8 |
0.177 |
4.5 |
4.160 |
1.890 |
6.19 |
4.190 |
1.900 |
6.26 |
|
|
21/2 |
65 |
3.014 |
76.6 |
2.969 |
75.4 |
0.177 |
4.5 |
5.330 |
2.420 |
7.93 |
5.390 |
2.440 |
8.05 |
|
|
3 |
80 |
3.524 |
89.5 |
3.469 |
88.1 |
0.196 |
5.0 |
6.920 |
3.140 |
10.3 |
6.870 |
3.120 |
10.5 |
|
|
4 |
100 |
4.524 |
114.9 |
4.459 |
113.3 |
0.212 |
5.4 |
9.740 |
4.420 |
14.5 |
9.910 |
4.500 |
14.8 |
|
|
5 |
125 |
5.534 |
140.6 |
5.459 |
138.7 |
0.212 |
5.4 |
12.30 |
5.460 |
17.9 |
12.30 |
5.580 |
18.4 |
|
|
6 |
150 |
6.539 |
166.1 |
6.459 |
164.1 |
0.212 |
5.4 |
14.31 |
6.490 |
21.3 |
14.70 |
6.670 |
21.9 |
|
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