Cold-drawn seamless carbon steel pipe OD219×6mm is a high-precision, high-strength industrial tubing widely used in machinery manufacturing, oil and gas transportation, hydraulic piping, and building structures. Produced via cold-drawing technology, it ensures high dimensional accuracy, a smooth surface finish, and stable mechanical properties, making it one of the standard specifications commonly procured for engineering and industrial applications.
I. Product Parameters and Specifications
| Parameter | Value / Range |
|---|---|
| Outer Diameter (OD) | 219 mm |
| Wall Thickness (WT) | 6 mm |
| Material Grade | Q235 / Q345 |
| Yield Strength | Q235: ≥ 235 MPa; Q345: ≥ 345 MPa |
| Tensile Strength | Q235: 370–500 MPa; Q345: 470–630 MPa |
| Elongation | ≥ 22% |
| Length | 6–12 m (customizable) |
| Production Process | Cold-drawn seamless steel pipe |
| Surface Condition | Bright, suitable for painting or machining |
| Standard | GB/T 8162 / customizable per customer request |
II. Product Features
High-Precision Dimensions: Cold-drawn manufacturing ensures OD219×6mm tubing with outer diameter and wall thickness tolerances within ±0.5%, facilitating easy processing and installation.
High Strength Performance: Cold drawing enhances yield strength and tensile strength, ensuring safe and reliable performance in pressure systems.
Smooth Surface Finish: Requires no secondary polishing, enabling direct use for machining or anti-corrosion coating.
Wide Range of Applications: Suitable for medium-to-high pressure hydraulic pipelines, oil and gas transmission lines, mechanical structural components, and more.
III. Pricing Information
The price of cold-drawn seamless carbon steel pipe OD219×6mm is influenced by multiple factors. The following serves as reference information:
Reference Market Price: Approximately 4100–4600 RMB/ton
Factors Affecting Price:
Material Grade: Q235 is lower, Q345 is higher
Steel Raw Materials: Fluctuations in billet and iron ore prices
Production Process: Cold-drawn tubes incur slightly higher processing costs than hot-rolled tubes
Purchase Quantity: Larger batches yield lower unit prices
Anti-corrosion or Surface Treatment: Additional costs of approx. 10–15% apply for treatments like galvanizing, plastic coating, or anti-corrosion processing
Logistics & Region: Transportation distance and mode also impact final pricing
Note: Prices are for reference only. Contact suppliers for the latest actual quotations.
IV. Application Scenarios
Oil and Gas Transportation: Suitable for medium-to-high-pressure oil and gas pipelines
Industrial Machinery Piping: Hydraulic systems, cooling systems, factory piping
Building Structural Components: Support structures, frame structures, steel components
Special Processing: Such as machined parts or high-precision piping
V. Selection Recommendations
(1) Material Selection:
Q235: Suitable for general industrial and low-pressure pipelines
Q345: Suitable for high-pressure pipelines and scenarios with significant structural stress
(2) Wall Thickness Calculation:
OD219×6mm corresponds to liquid or gas transportation with working pressure ≤ 2.5 MPa
For high-pressure scenarios, select thick-walled pipes or increase the safety factor
(3) Length Selection:
Standard lengths 6–12 m; custom lengths available per site requirements for easier installation and welding
(4) Corrosion Protection:
Plastic coating or epoxy powder spraying recommended for underground or corrosive environments
Verify surface coating temperature rating for high-temperature applications
(5) Procurement Considerations:
Confirm production standard GB/T 8162 or customer-specified standard
Request mechanical property reports (tensile, impact, bending)
For bulk purchases, request manufacturer’s inspection reports for billets and finished pipes.
VI. Cold-Drawn Seamless Carbon Steel Pipe OD219×6mm Parameter × Pressure × Price Comparison Table
| Outer Diameter OD (mm) | Wall Thickness WT (mm) | Material Grade | Theoretical Weight (kg/m) | Allowable Working Pressure (MPa) | Reference Price (CNY/ton) | Remarks |
|---|---|---|---|---|---|---|
| 219 | 6 | Q235 | 33.6 | ≤ 2.5 | 4100–4300 | Low-pressure liquid or gas transport |
| 219 | 6 | Q345 | 33.6 | ≤ 3.2 | 4400–4600 | Medium-pressure pipelines, suitable for industrial machinery or medium-pressure oil transport |
| 219 | 8 | Q235 | 44.4 | ≤ 3.5 | 4200–4400 | Thick-wall, can withstand higher pressure |
| 219 | 8 | Q345 | 44.4 | ≤ 4.5 | 4500–4700 | High-pressure transport or industrial equipment piping |
| 219 | 10 | Q345 | 55.1 | ≤ 5.5 | 4700–5000 | High-pressure oil & gas pipelines or special structural pipes |
| 219 | 12 | Q345 | 65.8 | ≤ 6.5 | 4900–5200 | Special high-pressure scenarios, engineering confirmation recommended |
Selection Recommendations
Low-pressure conveyance (≤2.5 MPa) → OD219×6mm Q235 is sufficient
Medium-pressure conveyance (2.5–4.5 MPa) → Select Q345 material with 6–8 mm wall thickness
High-pressure scenarios (4.5–6.5 MPa) → Thick-walled Q345 pipe (8–12 mm), and consider anti-corrosion treatment.