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Seamless or Welded Octangon Steel Pipe GB/T 3094 Cold Drawn Tube 10# 20# Q195 Q235 Q345
Octagon Steel Tube is mostly seamless tube or welded tube, produced according to the Chinese Standard GB/T 3094, which is a standard for cold drawn shaped steel tubes.
Octagon Steel Tube is widely used in structural parts, tool and machinery parts. And the barrel compared to stainless steel Pipes generally have a greater moment of inertia and section modulus, flexural torsional greater capacity, can greatly reduce the structural weight, saving steel.
Steel Grade:
10#/ 20#/ 35#/ 45#/ Q195/ Q215/ Q235/ Q295/ Q345/ Q390
Application:
Used in structural parts, tool and machinery parts
Production method:
Cold drawn
Tube Type:
Seamless tube according to the Chinese standard GB/T 3094, or welded tube according to customers' request
Tolerance:
According to the following tables, or according to customers’ request.
| Tolerance for the width | |||
| Size(mm) | Tolerance(mm) | ||
| General | High Grade | ||
| Width A / B | ≤30 | ±0.30 | ±0.20 |
| ＞30-50 | ±0.40 | ±0.30 | |
| ＞50-75 | ±0.80%A ±0.80%B | ±0.70%A ±0.70%B | |
| ＞75 | ±1%A ±1%B | ±0.8%A ±0.8%B | |
| Tolerance for wall thickness | |||
| Size(mm) | Tolerance(mm) | ||
| General | High Grade | ||
| Width A / B | ≤1.0 | ±0.18 | ±0.12 |
| ＞1.0-3.0 | +15% WT -10% WT | +12.5% WT -10% WT | |
| ＞3.0 | +12.5% WT -10% WT | ±10% WT | |
Edge bumpiness for the Tube:
According to the following tables, or according to customers’ request.
| Edge bumpiness | |||
| Size(mm) | Tolerance(mm) | ||
| General | High Grade | ||
| Width A / B | ≤30 | 0.20 | 0.10 |
| ＞30-50 | 0.30 | 0.15 | |
| ＞50-75 | 0.80% | 0.50% | |
| ＞75 | 0.90% | 0.60% | |
Bending:
For General tube, the bending should be ≤4.0mm/m, and the total straightness should be ≤0.4%.
For High Grade tube, the bending should be ≤2.0mm/m, and the total straightness should be ≤0.2%.
Mechanical Property:
| Steel Grade | Tensile Strength MPa | Yield Strength MPa | Elongation % |
| No less than | |||
| 10 | 335 | 205 | 24 |
| 20 | 390 | 245 | 20 |
| 35 | 510 | 305 | 17 |
| 45 | 590 | 335 | 14 |
| Q195 | 315 | 195 | 22 |
| Q215 | 335 | 215 | 22 |
| Q235 | 375 | 235 | 20 |
| Q295 | 430 | 295 | 22 |
| Q345 | 510 | 345 | 21 |
| Q390 | 530 | 390 | 18 |
Shape of ends:
Both ends of the pipe should be cut to a complete end surface perpendicular to the axis and burs shall be removed from the ends.
Delivery condition:
Cold Drawn, heat treatment is also acceptable.
Production Picture:
