Wall Thickness 8mm10mm12mm 20# Round Seamless Steel Pipe
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- Overview
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Product Induction
Grade 20 steel is a high-quality carbon structural steel that can be processed into seamless steel pipes through hot rolling or cold drawing.Cold-drawn and hot-rolled products exhibit significant differences in outer diameter and wall thickness, with lengths available for cutting to meet specific requirements.
It possesses excellent properties such as good plasticity, high toughness, and superior weldability. Its machinability is better in the normalized or cold-drawn condition than in the annealed state. It can be used for building steel structures, columns, space frames, mechanical components, hydraulic props, automotive parts, medium- and low-pressure fluid conveyance, petrochemical cracking pipelines, boiler water-cooled walls, heat exchanger tubes, and more.
Overall, 20# seamless pipe is the most cost-effective general-purpose carbon steel seamless pipe for “medium-low pressure, non-highly corrosive, -40°C to 450°C” environments.
Products Pictures
Specification
| Product Name | Wall Thickness 8mm10mm12mm 20# Round Seamless Steel Pipe |
| Technique |
Hot-rolled(Outer diameter 6–630 mm, wall thickness 1–60 mm) or Cold Drawn(Outer diameter 6–325 mm,wall thickness 0.5–25 mm) |
| Grade | 20# |
| Grade Can be Supplied |
Structural pipe,Liquid pipe,High pressure boiler tube,Pipeline, Alloy pipe,Structure pipe,Vehicle pipe,P ipe for pipe mould,Pipe for hydraulic prop, Pipe for fluid transmission all types seamless pipes with all grades can be produced. |
| Outer Diameters | OD6mm-OD 2500mm; |
| Wall Thickness | 1mm to 200mm |
| Length | 10mm to 25000mm,cut to length |
| Certificate | ISO9001,RoHS |
| Section Shape | Round |
| OEM/ODM | Available |
| Processing Service | Welding, Punching, Tapping,Cutting, Bending, Decoiling |
| Application | Building steel structures, columns, space frames, mechanical components, hydraulic props, automotive parts, medium- and low-pressure fluid conveyance, petrochemical cracking pipelines, boiler water-cooled walls, heat exchanger tubes, and more |
Chemical Composition
| Grade | C % | Si % | Mn % | P max | S max | Cr Ni Cu max |
| 20# | 0.17–0.24 | 0.17–0.37 | 0.35–0.65 | 0.035 | 0.035 | 0.25 |
Mechanical Properties
| Grade | tensile strength（MPa） | yield strength（MPa） | Elongation% |
| 20# | ≥ 410 MPa | ≥ 245 MPa | ≥ 25 % |
High Quality Performance of Seamless Pipe # 20
1.The low-carbon design with a carbon content of 0.17–0.24% ensures the steel pipe resists cracking during severe plastic deformation processes such as cold drawing, cold rolling, bending, flattening, and flaring. After cold drawing, the elongation remains ≥10%.
2.The low-carbon and low-sulfur/phosphorus (≤0.035%) chemical composition enables one-pass welding, delivering high impact toughness in both welds and heat-affected zones. Welding can be performed at -10°C without preheating.
3.It exhibits excellent low-temperature toughness and is free from temper brittleness. Since 20# steel contains no alloying elements that cause temper brittleness, it will not experience sudden embrittlement when operating long-term in medium- and low-pressure boilers below 450°C.
4.Low tonnage price and low manufacturing costs make it highly cost-effective for large-scale steel structures, low-pressure boilers, and fluid pipeline projects.
20#Stocklist
| 70*8 | 70*10 | 70*12 | 73*8 | 73*10 | 73*12 | 76*8 | 76*10 | 76*12 | 80*8 |
| 80*10 | 80*12 | 83*8 | 83*10 | 83*12 | 89*8 | 89*10 | 89*12 | 95*12 | 102*10 |
| 108*12 | 114*10 | 114*14 | 121*8 | 121*14 | 121*10 | 127*8 | 127*10 | 127*14 | 133*8 |
| 133*14 | 140*8 | 140*10 | 152*10 | 152*12 | 152*14 | 159*10 | 159*12 | 168*8 | 168*16 |
| 180*12 | 180*14 | 194*14 | 203*10 | 203*12 | 203*14 | 203*16 | 203*18 | 219*12 | 219*14 |
| 219*18 | 219*22 | 245*20 | 273*10 | 273*12 | 273*25 | 273*28 | 299*18 | 299*30 | 299*35 |
| 325*10 | 325*12 | 325*14 | 325*16 | 325*18 | 325*22 | 325*28 | 325*30 |
Pipe Processing
Process according to the drawings
FAQ
Q: What exactly is 20# seamless pipe steel?
A: It belongs to high-quality carbon structural steel, containing 0.17–0.24% C and 0.35–0.65% Mn. Designed as low-carbon steel, it offers outstanding plasticity and weldability.
Q: How to choose between hot-rolled and cold-drawn seamless steel pipes for 20# steel?
A: Hot-rolled pipes have an outer diameter of 32–630 mm and wall thickness of 2.5–60 mm. They offer lower cost but generally less precise dimensions. Cold-drawn pipes range from 6–325 mm in outer diameter and 0.25–25 mm in wall thickness. They provide dimensional accuracy and superior surface finish, making them suitable for machining and high-pressure oil circuits.
Q:What are the maximum operating pressure and temperature limits for 20# material?
A:When wall thickness ≤ 20 mm, it can be safely used up to 4 MPa and 350°C. For pressures exceeding 6.4 MPa, it is recommended to switch to 45# or Q345B.
Q:Can it be used in low-temperature environments?
A:At 0°C, it maintains an impact resistance of ≥39 J, and at -20°C, it still retains ≥27 J, making it suitable for use in generally cold regions.
Q: Why does tool adhesion occur easily during turning?
A: Because low carbon content results in high ductility, making chips difficult to break off. They tend to wrap around and adhere to the tool. This adhesion can be mitigated by increasing spindle speed, incorporating chip-breaking grooves, using coated inserts, or applying minimal quantity lubrication.
Q: How can I get your quotation as soon as possible?
A:Please contact:
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