seamless Pipes & seamless tubes     

 

  Seamless Pipes & Seamless Tubes: A heated billet is brought into contact with tapered revolving rolls in such a way that the billed is pulled into the space allowed between the rolls. The mandrel is placed in the space. The soft centre of the billet makes it possible for the rolls to draw the billet over the mandrel, producing a hollow shell. When the billet has entirely passed over the mandrel, it is in the form of a thick walled seamless tube. The heavy walled tube is then passed to a rolling mill which reduces the tube to piping of proper outside diamter and wall thickness. Depending upon the process condition (temperature), seamless tube/pipes is termed as Hot Finish Seamless or cold drawn seamless as the term implies.

Apart from above tubes and pipes can be formed by other processes, like forged, tunned, bored, etc depending upon the requirement.
Outside 
Diameter/
Thickness
in. 1/8  5/32  3/16  7/32  1/4  9/32 
0.125 0.156 0.188 0.219 0.250 0.281
in. mm 3.175 3.969 4.763 5.556 6.350 7.144
1 7/16  36.51 0.796 0.970 1.140 1.295 1.440 1.557
1 1/2  38.10 0.834 1.017 1.196 1.361 1.516 1.661
1 5/8  41.28 0.909 1.111 1.310 1.493 1.667 1.838
1 11/16  42.86 0.948 1.159 1.368 1.560 1.744 1.918
1 3/4  44.45 0.985 1.206 1.424 1.626 1.819 2.002
1 7/8  47.63 1.061 1.301 1.538 1.759 1.970 2.172
1 29/32  48.42 1.080 1.324 1.566 1.792 2.008 2.215
2 50.80 1.137 1.395 1.652 1.892 2.122 2.343
2 1/8  53.98 1.213 1.490 1.766 2.024 2.273 2.513
2 5/32  54.77 1.231 1.508 1.794 2.057 2.311 2.555
2 1/4  57.15 1.288 1.584 1.880 2.157 2.425 2.683
2 3/8  60.33 1.364 1.679 1.994 2.290 2.577 2.854
2 1/2  63.50 1.440 1.773 2.108 2.423 2.728 3.024
2 5/8  66.68 1.516 1.868 2.222 2.556 2.880 3.165
2 3/4  69.85 1.591 1.693 2.336 2.688 3.031 3.365
2 7/8  73.03 1.667 2.057 2.450 2.821 3.183 3.538
3 76.20 1.743 2.152 2.564 2.954 3.334 3.706
3 1/4  82.55 1.895 2.341 3.792 3.219 3.638 4.046
3 1/2  88.90 2.046 2.530 3.020 3.485 3.941 4.387
3 3/4  95.25 2.198 2.719 3.248 3.750 4.244 4.728
4 101.60 2.349 2.908 3.476 4.016 4.547 5.068
4 1/4  107.95 2.501 3.098 3.704 4.282 4.850 5.409
4 1/2  114.30 2.652 3.287 3.932 4.547 5.158 5.750
4 3/4  120.65 2.804 3.476 4.160 4.813 5.456 6.091
5 127.00 2.955 3.665 4.388 5.078 5.759 6.431
5 3/32  129.38 3.012 3.736 4.473 5.178 5.873 6.559
5 1/4  133.35 3.107 3.854 4.616 5.344 6.063 6.772
5 3/8  136.53 3.183 3.949 4.730 5.476 6.214 6.942
5 1/2  139.70 3.259 4.043 4.843 5.609 6.366 7.113
5 9/16  141.28 3.297 4.091 4.901 5.676 6.442 7.199
5 3/4  146.05 3.410 4.232 5.071 5.875 6.669 7.453
6 152.40 3.562 4.422 5.299 6.140 6.972 7.794
 
Outside 
Diameter /
Thickness
in. 5/16  11/32  3/8 13/32 7/16 15/32 1/2
0.313 0.344 0.375 0.406 0.438 0.469 0.5
in. mm 7.938 8.732 9.525 10.319 11.113 11.907 12.700
1 7/16  36.51 1.708 1.825 1.933 2.032 2.124 2.204 2.275
1 1/2  38.10 1.802 1.929 2.046 2.354 2.256 2.345 2.425
1 5/8  41.28 1.992 2.137 2.273 2.400 2.522 2.629 2.728
1 11/16  42.86 2.087 2.242 2.388 2.524 2.655 2.773 2.881
1 3/4  44.45 2.181 2.346 2.501 2.646 2.787 2.914 3.031
1 7/8  47.63 2.371 2.554 2.728 2.863 3.053 3.198 3.334
1 29/32  48.42 2.418 2.606 2.785 2.954 3.118 3.269 3.410
2 50.80 2.561 2.763 2.955 3.139 3.318 3.482 3.638
2 1/8  53.98 2.751 2.971 3.183 3.385 3.584 3.767 3.941
2 5/32  54.77 2.798 3.023 3.239 3.446 3.650 3.837 4.016
2 1/4  57.15 2.940 3.180 3.410 3.631 3.849 4.051 4.244
2 3/8  60.33 3.130 3.389 3.638 3.877 4.115 4.335 4.547
2 1/2  63.50 3.320 3.597 3.865 4.123 4.380 4.620 4.850
2 5/8  66.68 3.510 3.806 4.092 4.369 4.649 4.904 5.153
2 3/4  69.85 3.699 4.014 4.320 4.616 4.911 5.188 5.456
2 7/8  73.03 3.889 4.223 4.547 4.862 5.177 5.453 5.759
3 76.20 4.079 4.431 4.774 5.108 5.442 5.757 6.063
3 1/4  82.55 4.459 4.848 5.229 5.600 5.974 6.326 6.669
3 1/2  88.90 4.838 5.265 5.684 6.192 6.505 6.894 7.275
3 3/4  95.25 5.218 5.683 6.138 6.585 7.036 7.463 7.881
4 101.60 5.597 6.100 6.593 7.077 7.597 8.032 8.488
4 1/4  107.95 5.977 6.517 7.048 7.569 8.098 8.600 9.094
4 1/2  114.30 6.356 6.934 7.520 8.061 8.629 9.169 9.700
4 3/4  120.65 6.736 7.351 7.957 8.554 9.160 9.738 10.306
5 127.00 7.115 7.768 8.412 9.046 9.691 10.306 10.913
5 3/32  129.38 7.258 7.925 8.583 9.231 9.891 10.520 11.140
5 1/4  133.35 7.495 8.185 8.866 9.538 10.222 10.875 11.519
5 3/8  136.53 7.684 8.394 9.094 9.784 10.488 11.159 11.822
5 1/2  139.70 7.874 8.602 9.321 10.031 10.753 11.444 12.125
5 9/16  141.28 2.970 8.707 9.436 10.155 10.887 11.587 12.278
5 3/4  146.05 8.254 9.019 9.776 10.523 11.284 12.012 12.731
6 152.40 8.633 9.436 10.230 11.015 11.815 12.581 13.338

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