I. EN 10217-7 Stainless Steel Welded Pipe Overview
EN 10217-7 stainless steel welded pipes are precision steel tubes manufactured according to European Standard EN 10305. They are primarily used in piping systems requiring high dimensional accuracy and excellent surface quality.
Produced via welding or cold drawing processes, common materials include austenitic stainless steels such as 304, 304L, 316, and 316L, offering superior corrosion resistance and weldability.
II. EN 10217-7 Stainless Steel Welded Pipe common materials and application areas
| Material | Features | Typical Applications | Selection Advice / Suitable Environment |
|---|---|---|---|
| 304 | General austenitic stainless steel, resistant to general corrosion, cost-effective | General chemical pipelines, food processing, HVAC | Indoor or light corrosion environment, suitable for transporting liquids at normal temperature |
| 304L | Low carbon version of 304, resistant to intergranular corrosion after welding | Welded pipelines, chemical, pharmaceutical | Welding required and light corrosion environment, avoid high temperature corrosion cracks |
| 316 | Contains Mo, strong resistance to chloride corrosion | Seawater pipelines, chemical, pharmaceutical, food industry | Chloride-containing environment or highly corrosive fluids |
| 316L | Low carbon version of 316, better welding performance | Seawater, chemical pipelines, pharmaceutical equipment | High welding requirements, resistant to chloride corrosion environment |
| 321 | Titanium-stabilized, resistant to intergranular corrosion and high-temperature oxidation | High-temperature chemical pipelines, boiler tubes | High temperature and welded structures, prevent intergranular corrosion |
| 310S | High chromium-nickel heat-resistant steel | High-temperature furnace tubes, heat exchangers | High-temperature oxidation environment, high heat resistance requirement |
III. EN 10217-7 Stainless Steel Welded Pipe mechanical and physical properties
| Performance Category | Parameter | Value / Description |
|---|---|---|
| Mechanical Properties | Yield Strength (Rp0.2) | 195 – 310 MPa (varies by material) |
| Tensile Strength (Rm) | 500 – 750 MPa | |
| Elongation (A%) | 30 – 50% | |
| Hardness (HB) | 160 – 220 | |
| Physical Properties | Density | 7.9 g/cm³ |
| Coefficient of Thermal Expansion | 16 – 17 ×10⁻⁶ /°C | |
| Thermal Conductivity | 15 – 25 W/m·K | |
| Operating Temperature | -196°C to 400°C (varies by material) | |
| Weldability | Good, suitable for TIG / MIG / spot welding | |
| Surface Roughness | Ra 0.4 – 1.6 μm (depending on polishing grade) | |
| Corrosion Resistance | Good to excellent, 316/316L more resistant to chloride corrosion |
IV. Description of each part of the EN 10305 standard
| Standard | Overview | Pipe Type | Applicable Scope / Typical Applications |
|---|---|---|---|
| EN 10305-1 | Cold-drawn seamless precision steel pipe | Seamless steel pipe | Precision mechanical structures, hydraulic pipelines, instrumentation tubing, high-precision industrial applications |
| EN 10305-3 | Cold-drawn welded precision steel pipe | Welded steel pipe (longitudinal seam welded) | Industrial fluid transport, chemical, pharmaceutical, HVAC, food pipelines |
Additional Information:
Part 1 (EN 10305-1)
Emphasis on dimensional accuracy and surface finish
Typically used in high-precision mechanical or hydraulic systems
Small outer diameter and uniform wall thickness
Part 3 (EN 10305-3)
Uses welding and cold drawing processes
Suitable for industrial fluid piping, chemical, and pharmaceutical piping
Larger diameters and a variety of materials (such as 304 and 316) are available
V. EN 10217-7 Stainless Steel Welded Pipe FAQ
i. Q: What are the standard parts for EN 10217-7 stainless steel welded pipe?
A: They primarily include EN 10305-1 (cold-drawn seamless precision pipe) and EN 10305-3 (cold-drawn welded precision pipe). Part 1 focuses on small-diameter precision pipes, while Part 3 is more focused on industrial piping applications.
ii. Q: What are the commonly used materials?
A: Common materials include 304, 304L, 316, 316L, and 321 austenitic stainless steels. The choice depends on the corrosive environment and welding requirements.
iii. Q: What operating temperatures can these pipes withstand?
A: Depending on the material, the operating temperature range is approximately -196°C to 400°C; 316/316L are more corrosion-resistant in chloride-containing environments.
iv. Q: What applications are EN 10305 welded pipes suitable for?
A: Widely used in the chemical, pharmaceutical, and food industries, heating, ventilation, and air conditioning (HVAC), liquid and gas fluid transportation, and industrial piping systems.
v. Q: What kind of pipe end and surface treatments are available?
A: Pipe ends can be finished, deburred, or chamfered. Surface treatments include polishing, pickling, brushing, and varnishing, depending on the application environment.
vi. Q: What are the welding and processing properties like?
A: They have excellent weldability and can be welded using TIG, MIG, or spot welding. Some materials can be cold or hot bent, adapting to different installation and processing requirements.
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