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[China]
Trade Verify
Address: No.101 Shijing East Road, Tudian Town, Tongxiang, China
Contact name:Denny
NEW-ERA STEEL TUBE TECHNOLOGY CO.,LTD |
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Verified Suppliers
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GOST 8639-82 steel 35 square steel steel pipes , cold deformed seamless hollow section steel tubes
Sizes of square pipes have to confirm the values indicated in the table below:
| Outside size A, mm | Wall thickness s, mm | Section square, cm2 | Weight of 1 m pipe, kg, | Inertia moment, cm4~ | Resistance moment, cm3~ |
| Ix=Iy | Wx=Wy | ||||
| 50 | 5 | 8.57 | 6.73 | 28.26 | 11.3 |
| 60 | 8 | 15.54 | 12.20 | 67.71 | 22.57 |
| 100 | 8 | 28.34 | 22.25 | 392.65 | 78.53 |
| 120 | 8 | 34.74 | 27.27 | 715.66 | 119.28 |
Steel density 7/85 g/cm3
Pipe static characteristic is calculated for R=1,5 s
4. Bending radius R should no more than 2 s.
5. Pipes are produced:
Random length
Seamless cold-deformed – 1.5-11m;
Fixed length
Seamless cold-deformed – 4.5-11m;
Multiple lengths
Seamless cold-deformed – 1.5-11m with tolerance for every cut 5 mm;
Total length of multiple length pipes can’t be more than upper limit of fixed length pipe. Tolerance for every ratio is 5mm (if other tolerance is not stipulated) and is a part of every ordered ratio.
6.Limit deviations for outside sizes, wall thickness & sides concavity can’t be more than indicated in the table below:
| Parameter name | Limit deviation of pipe size depending on the precision of production | |
| normal | high | |
| Outside sizes | +-0.3mm | +-0.25mm |
Wall thickness: wall thickness ≤ 3.5mm wall thickness > 3.5mm
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± 12.5% ± 12.5% |
± 12.5% ± 10.0% |
Sides concavity and convexity: Up to 50mm Over 50 to 70mm Over 70 |
0.5mm 0.75mm 1.0mm |
0.5mm 0.5mm 0.8mm |
| Coiling of square & rectangular pipes | - | According to agreement with the customer |
7. Thickness variation can’t lead the wall out the limit deviations concerning wall thickness.
8. In pipe cross-section the deviation from right angle can’t be more than ±1.5°.
9. Pipe curvature can’t be more than 2 mm for 1m of length.
Pipes are produced without adjustment, in this case curvature is not regulated.
