| After-sales Service: | Support Online |
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| Warranty: | 1year |
| Type: | Seamless |
| Technique: | Cold Drawn |
| Material: | Alloy Steel |
| Surface Treatment: | Black/Oiled/Galvanization |
| Samples: |
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| Customization: |
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Specially shaped seamless steel pipes include those with non circular cross-sectional profiles, those with equal wall thickness, those with variable wall thickness, those with variable diameter and wall thickness along the length direction, and those with symmetrical and asymmetric cross-sectional profiles. Such as square, rectangular, conical, trapezoidal, spiral, etc. Specially shaped steel pipes are more suitable for the unique usage conditions, saving metal and improving labor productivity in component manufacturing. It is widely used in aviation, automobiles, shipbuilding, mining machinery, agricultural machinery, construction, light textile, and boiler manufacturing. The methods for producing shaped pipes include cold drawing, electric welding, extrusion, hot rolling, etc. Among them, the cold drawing method has been widely used.
| Triangle Steel Tube | Outer (mm) | Inner (mm) | ||
| H | S | H | S | |
| 1S | 32.4 | 2.5 | 26.6 | 3.5 |
| 2S | 36.1 | 3.4 | 29 | 4 |
| 4S | 43.4 | 3.3 | 36.1 | 4.4 |
| 5S | 51.3 | 2.9 | 44.7 | 4 |
| 6S | 53.6 | 3.8 | 44.7 | 4 |
| 7S | 53.6 | 3.8 | 44.7 | 5.5 |
| 8S | 62.7 | 4 | 53.6 | 4.5 |
| 9S | 62.7 | 4 | 53.6 | 5.5 |
| st52 | C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
| Q215B | 0.37-0.44 | 0.17-0.37 | 0.5-0.8 | ≤0.035 | ≤0.035 | 0.8-1.1 | ≤0.3 | ≤0.3 | ≤0.15 |
| 45#/1045 | 0.43-0.5 | - | 0.6-0.9 | ≤0.04 | ≤0.05 | - | - | - | -- |
| 40Cr/5140/1.7035 | 0.37-0.44 | 0.17-0.37 | 0.5-0.8 | ≤0.035 | ≤0.035 | 0.8-1.1 | ≤0.3 | ≤0.3 | ≤0.15 |
| 40MnB | 0.37-0.44 | 0.17-0.37 | 1.1-1.4 | ≤0.035 | ≤0.035 | ≤0.3 | ≤0.3 | ≤0.3 | ≤0.15 |
| Production Range | Outer Diameter:6-530mm (0.24 inch - 21.18 inch) |
| Wall Thickness:0.8-200mm (0.03 inch - 7.89 inch) | |
| Material / Grade | Carbon Steel: GB/T 3094: 10#, 20#, 35#, 45#, 55#, Q235B, Q235C, CF53, A105 ASTM A519: 1010, 1020, 1026, 1035, 1045, 1050 DIN17121/EN 10297-1, DIN1629/DIN2391/EN 10305-1: C10/CK10, C22/CK22, C35/CK35, C45/CK45, CF53 JIS3441/JIS3444/JIS3445: STKM11A, STKM12A/STKM12B/STKM12C, STKM13A/STKM13B/STKM13C JIS G4051: S10C, S20C, S25C, S35C, S45C, S55C |
| Alloy Steel: GB/T 3094: 16Mn(Q345B), 20Cr, 40Cr, 15CrMo, 20CrMo, 28CrMo, 30CrMo, 35CrMo, 42CrMo, 20CrMnTi, 40MnMoV, 20Mn2, ZF6, 16MnCr5, 20MnCr5, 38Mn2V, 09CrCuSb(ND) ASTM A519: 5120, 5140, 4130, 4135, 4140 DIN17121/EN 10297-1, DIN1629/DIN2391/EN 10305-1: ST52, EN10084-1998 20Cr4, 41Cr4, 15CrMo4, 25CrMo4, 35CrMo4, 42CrMo4, 16MnCr5 JIS3441/JIS3444/JIS3445: SCM432/SCRRM3, SCM4 JIS G4053: JIS SCr420, JIS SCr440, SCM415, SCM420 |
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| Tolerance | Can be customized according to customer's requirements |
| Technique | Cold Drawn / Cold Rolled |
| Shape | Triangle, Hexagon, Square, Rectangle, Octagon, Lemon Pipe and Others can be customized |
| Further Processing for Steel Tubes | Cutting, Chamfer, Threading, Inner diameter or Outer Diameter Lathe, Surface Shot Blasting, Laser Marking |
| +C(BK) | Cold drawn/hard.After the last cold forming,no heat treatment. |
| +LC(BKW) | Cold drawn/soft.After the last heat treatment follows the cold drawing there is a light finishing pass. |
| +SR(BKS) | Cold drawn and stress relieved annealed. After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere. |
| +A(GBK) | After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere. |
| +N(NBK) | Normalized. After the last cold drawing process the tubes are annealed in a controlled atmosphere. |
Pipeline transportation, boiler pipes, hydraulic/automotive pipes, oil/natural gas drilling, food/beverage/dairy products, mechanical industry, chemical industry, mining, construction and decoration, special applications
Specially shaped seamless steel pipes are widely used in various structural components, tools, and mechanical components. Compared with circular pipes, special-shaped pipes generally have larger moments of inertia and cross-sectional modulus, and have greater bending and torsion resistance, which can greatly reduce structural weight and save steel.
Special shaped pipes are generally distinguished based on their cross-sectional area, and can be divided into seamless steel pipe special shaped pipes, aluminum alloy special shaped pipes, and plastic special shaped pipes according to their materials. Below, we will mainly introduce the special shaped steel pipe.
Steel pipe shaped pipes can be divided into elliptical shaped steel pipes, triangular shaped steel pipes, hexagonal shaped steel pipes, diamond shaped steel pipes, octagonal shaped steel pipes, semi-circular shaped steel pipes, unequal hexagonal shaped steel pipes, five petal plum blossom shaped steel pipes, double convex shaped steel pipes, double concave shaped steel pipes, melon shaped steel pipes, conical shaped steel pipes, and corrugated shaped steel pipes.
| Steel pipe inspection equipment | Tensile testing machine, Rockwell hardness machine, eddy current testing, chemical composition testing instrument, magnetic particle testing instrument, metallographic analysis instrument, surface roughness measuring instrument, outer diameter micrometer, wall thickness micrometer, inner diameter dial gauge, vernier caliper |
| Application | Automotive components, anchor rod support, hydraulic pipe joints, petroleum machinery, geological drilling, fluid conveying, drilling tools, motorcycles, bicycles, motor casings, agricultural machinery accessories, engineering machinery, fasteners |
| Production process | Round steel storage → Round steel inspection → Round steel sawing → Center hole drilling → Piercing → Pickling → Heading → Cold drawing or cold rolling (finishing rolling) → Annealing → Straightening → Head and tail cutting → Finished product inspection → Packaging → Shipping |
1. Who are we?
Our headquarter is located in Shandong, China. Since 2022, we have sold to North America (60.00%), Western Europe (14.00%) and South America (6.00%). There are about 11-50 people in our office.
2. How do we guarantee quality?
Always provide pre-production samples before mass production;
Always carry out final inspection before shipment;
3. What can you buy from us?
Copper, aluminum, die steel, titanium, customized machine parts
4. Why should you buy from us instead of other suppliers?
The company has 25 years of production experience. It has advanced precision production equipment, modern large warehouse, 200000 tons of inventory goods and a number of long-term stable cooperative customers.
5. What services can we provide?
Accepted delivery conditions: FOB, CFR, CIF, EXW
Accepted payment currency: US dollar, Euro, Japanese yen, Canadian dollar, Australian dollar, Hong Kong dollar, British pound, RMB, Swiss franc;
Accepted payment type: T/T, L/C, D/P D/A, PayPal;
Optional ports: Tianjin, Shanghai, Guangzhou;
Spoken: English, Chinese
6. How can we get your price?
A. We need the following information to quote for you:
1). Product Name
2). standard
3). Material grade (chemical composition)
4). dimension
5). amount
6). Special part drawin
Suppliers with verified business licenses
Audited Supplier 
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