Longitudinal Electric Resistance Steel Welded Tubes
Application:Suitable for mechanical, construction and other structural purposes, and the straight seam Welded Steel Pipe with an outer diameter of not more than 711mm, can also be applied to general welded steel pipe for fluid transportation
size:L--4~12m OD--5~711mm WT--0.5~5.5mm
Grade:10,20,Q195,Q215,Q213,Q275
Manufacture method:The steel pipe shall be made of hot rolled steel strip or cold rolled steel strip by high frequency resistance welding method
Delivery State:Steel tube should be welding or heat treatment state delivery
Surface Quality:The internal and external surfaces of the steel tube are not allowed to have cracks, scabs, folds, delaminations, laps, and burns. Allows for scribes, scratches, misalignment of welds, burns, oxide scales, and external burr removal traces that are not more than a negative wall thickness deviation
Tolerance of Outer Diameter Unit:mm
| Outer Diameter(D) | General Precesion(PD.A)a | Higher Precision(PD.B) | High Precision(PD.C) |
| 5-20 | ±0.30 | ±0.15 | ±0.05 |
| ﹥20-35 | ±0.40 | ±0.20 | ±0.10 |
| ＞35-50 | ±0.50 | ±0.25 | ±0.15 |
| ＞50-80 | ±1%D | ±0.35 | ±0.25 |
| ＞80-114.3 | ±0.60 | ±0.40 |
| ＞114.3-168.3 | ±0.70 | ±0.50 |
| ＞168.3-219.1 | ±0.80 | ±0.60 |
| ＞219.1-711 | ±0.75%D | ±0.5%D |
| a Not apply for steel pipe for roller of belt conveyor |
Tolerance of Wall Thickness Unit:mm
| Wall Thickness(t) | General Precesion(PD.A)a | Higher Precision(PD.B) | High Precision(PD.C) | Non-uniform Wall Thicknessb |
| 0.50-0.70 | ±0.10 | ±0.04 | ±0.03 | ≤7.5%t |
| ＞0.70-1.0 | ±0.05 | ±0.04 |
| ＞1.0-1.5 | ±0.06 | ±0.05 |
| ＞1.5-2.5 | ±10%t | ±0.12 | ±0.06 |
| ＞2.5-3.5 | ±0.16 | ±0.10 |
| ＞3.5-4.5 | ±0.22 | ±0.18 |
| ＞4.5-5.5 | ±0.26 | ±0.21 |
| ＞5.5 | ±7.5%t | ±5.0%t |
| a Not apply for steel pipe for roller of belt conveyor b Not apply for General Precesion steel tube. Non-uniform Wall Thickness means the difference between maximum and minimum values of measured wall thickness on the same cross section. |
Weight coefficient of galvanized steel pipe
| Wall thickness t/mm | 1.2 | 1.4 | 1.5 | 1.6 | 1.8 | 2.0 | 2.2 | 2.5 | 2.8 | 3.0 | 3.2 | 3.5 |
| Coefficient c | A | 1.106 | 1.091 | 1.085 | 1.080 | 1.071 | 1.064 | 1.058 | 1.051 | 1.045 | 1.042 | 1.040 | 1.036 |
| Coefficient c | B | 1.085 | 1.073 | 1.068 | 1.064 | 1.057 | 1.051 | 1.046 | 1.041 | 1.036 | 1.034 | 1.032 | 1.029 |
| Coefficient c | C | 1.064 | 1.055 | 1.051 | 1.048 | 1.042 | 1.038 | 1.035 | 1.031 | 1.027 | 1.025 | 1.022 | 1.020 |
| Wall thickness t/mm | 3.8 | 4.0 | 4.2 | 4.5 | 4.8 | 5.0 | 5.4 | 5.6 | 6.0 | 6.5 | 7.0 | 8.0 |
| Coefficient c | A | 1.034 | 1.032 | 1.030 | 1.028 | 1.027 | 1.025 | 1.024 | 1.023 | 1.021 | 1.020 | 1.018 | 1.016 |
| Coefficient c | B | 1.027 | 1.025 | 1.024 | 1.023 | 1.021 | 1.020 | 1.019 | 1.018 | 1.017 | 1.016 | 1.015 | 1.013 |
| Coefficient c | C | 1.020 | 1.019 | 1.018 | 1.017 | 1.016 | 1.015 | 1.014 | 1.014 | 1.013 | 1.012 | 1.011 | 1.010 |
| Wall thickness t/mm | 9.0 | 10.0 | 11.0 | 12.0 | 12.7 | 13.0 | 14.2 | 16.0 | 17.5 | 20.0 |
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| Coefficient c | A | 1.014 | 1.013 | 1.012 | 1.011 | 1.010 | 1.010 | 1.009 | 1.008 | 1.007 | 1.006 |
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| Coefficient c | B | 1.011 | 1.010 | 1.009 | 1.008 | 1.008 | 1.008 | 1.007 | 1.006 | 1.006 | 1.005 |
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| Coefficient c | C | 1.008 | 1.008 | 1.007 | 1.006 | 1.006 | 1.006 | 1.005 | 1.005 | 1.004 | 1.004 |
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