Product Overview：
The production and manufacturing process of thick walled seamless steel pipes can be divided into four basic methods: cold drawing/cold rolling/hot rolling/hot expansion. Materials such as 10 #, 20 #, 35 #, 45 #, 16Mn, 27SiMn, 15CrMo, 35CrMo, 12Cr1MoV, 10CrMo910 can be used, which can be applied to seamless steel pipes for general structures, seamless steel pipes for fluid transportation, seamless steel pipes for boilers, seamless steel pipes for petroleum cracking, seamless steel pipes for ships, etc. Thick walled seamless steel pipes are named after their appearance of thick walls and are mainly used in industries such as mechanical processing, coal mining and chemical engineering, and hydraulic steel.
| Product List |
| Product Name: | 10 # Thick walled seamless steel pipe | Seamless pipe |
| Product Name: | 20 # thick walled seamless steel pipe | seamless pipe |
| Product Name: | 45 # Thick walled seamless steel pipe | Seamless pipe |
| Product Name: | Q235 thick walled seamless steel pipe | seamless pipe |
| Product Name: | Q345 thick walled seamless steel pipe | seamless pipe |
| Product Name: | 16Mn thick walled seamless steel pipe | Seamless pipe |
| Product Name: | 40Cr thick walled seamless steel pipe | Seamless pipe |
| Product Name: | 27SiMn thick walled seamless steel pipe | Seamless pipe |
| Product Name: | 12Cr1MoV thick walled seamless steel pipe | Seamless pipe |
| Product Name: | 15CrMo thick walled seamless steel pipe | Seamless pipe |
| Parameter range |
| Outer diameter | Φ16mm‑Φ325mm |
| Wall thickness | 8mm‑65mm |
| Standard length | 1‑12m， Can process customized short and long rulers |
| Outer diameter accuracy | Maximum ±0.05mm |
| Executive Standards | ASTM A106, API 5L, DIN 17175, GB/T 5310 |
| Non-standard customization | Support customized non-standard wall thickness, inner hole honing, and pressure deep processing |
| High frequency spot specification table |
| Outer Diameter (mm) | 89
| 108 | 114 | 133 | 159 | 168 |
| Commonly available thick wall thickness in the market (mm) | 12、14、16、18、20 | 12、14、16、18、20、22、25 | 12、14、16、18、20、25 | 12、14、16、18、20、25、30 | 14、16、18、20、25、30、35 | 14、16、18、20、25、30、35 |
| Outer Diameter (mm) | 219
| 273 | 325 | 377 | 426 |
|
| Commonly available thick wall thickness in the market (mm) | 16、18、20、22、25、30、35、40 | 18、20、22、25、30、35、40、45 | 20、25、30、35、40、45、50 | 20、25、30、35、40、45、50、55 | 25、30、35、40、45、50、55、60 |
|
Optional tolerance range |
| Tolerance control | Optional manufacturing process |
| Tolerance ≤ 0.05 mm | Cold rolling |
| Tolerance ≤ 0.10 mm | Cold rolling |
| Tolerance ≤ 0.30 mm | Cold drawing | Cold rolling |
| Tolerance ≤ 0.50 mm | Cold drawing | Hot rolling |
| Tolerance ≤ 1.00 mm | Hot rolling | Hot expanding |
Table of Outer Diameter Tolerance Values(GB/T8163-2018 Hot Rolling, S/D＞0.10， Ordinary level)
|
| Outer diameter (mm) | 89
| 108 | 114 | 133 | 159 | 168 | 219 | 273 | 325 |
| Outer diameter tolerance ± (mm) | ±0.89 | ±1.08 | ±0.14 | ±0.33 | ±1.59 | ±1.68 | ±2.19 | ±2.73 | ±3.25 |
| Qualified lower limit upper limit (mm) | 88.11-89.89 | 106.92-109.08 | 112.86-115.14 | 131.67-134.33 | 157.41-160.59 | 166.32-169.68 | 216.81-221.19 | 270.27-275.73 | 321.75-328.25 |
All calculations are based on fixed millimeter values, without a percentage formula; Outer diameter deviation: ± 1% D (minimum ± 0.5 |
| Wall thickness tolerance value (Hot-rolled thick wall) |
| Wall thickness (mm) | 12
| 14 | 16 | 18 | 20 | 22 | 25 | 30 | 35 | 40 | 45 |
| Upper deviation (mm) | +1.50 | +1.75 | +2.00 | +2.25 | +2.50 | +2.75 | +3.13 | +3.75 | +4.38 | +5.00 | +5.63 |
| Lower deviation (mm) | -1.20 | -1.40 | -1.60 | -1.80 | -2.00 | -2.20 | -2.50 | -3.00 | -3.50 | -4.00 | -4.50 |
| Wall thickness qualified range (mm) | 10.80-13.50 | 12.60-15.75 | 14.40-18.00 | 16.20-20.25 | 18.00-22.50 | 19.80-24.75 | 22.50-28.13 | 27.00-33.75 | 31.50-39.38 | 36.00-45.00 | 40.50-50.63 |
All calculations are based on fixed millimeter values, without a percentage formula; Wall thickness deviation:+12.5% S/-10% S |
| Wall thickness value of hot expansion thick walled tube (Deviation+17.5% S/-12.5% S) |
| Wall thickness (mm) | 12 | 16 | 20 | 25 | 30 |
| Upper deviation (mm) | +2.10 | +2.80 | +3.50 | +4.38 | +5.25 |
| Lower deviation (mm) | ‑1.50 | ‑2.00 | ‑2.50 | ‑3.13 | ‑3.75 |
| Wall thickness qualified range (mm) | 10.50‑14.10 | 14.00‑18.80 | 17.50‑23.50 | 21.87‑29.38 | 26.25‑35.25 |
| Length&straightness (fixed values) |
| Project | Fixed length | Fixed length | Bending degree per meter |
| Condition | L ≤ 6m | L ≤ 6m | Thick walled S>15mm |
| Allowable deviation | +30 / 0 mm | +50 / 0 mm | ≤2.0 mm/m |
Optional delivery status
|
| Oil removal from oil pipes | Annealing and straightening | Steel pipe corrosion prevention |
| Steel pipe threading | Length cut-to-length | Steel pipe coating |
| Steel pipe cap | Exquisite bundling | Beveling |
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