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Basic Information
EN 10217 LSAW PIPE
Standard: EN10217
Grade: P195GH, P235GH, P265GH
Type: LSAW(Longitudinally Submerged Are Welding)
Outside diameter: 406 - 1420 mm
Wall Thickness: 10 - 50mm
The Wall Thickness Tolerance: ±5%
Length: normally 5.8m, 6m, 12m or as your required
Surface Treatment: Bare, Paintd, Oil, Hot Dipped, 3PE, FBE coated......
chemical composition
| Chemical composition(cast analysis)% | ||||||
| Steel Grade | C | Si max. |
Mn | P max. |
S max. |
|
| P195GH | ≤0.13 | 0.35 | ≤0.70 | 0.025 | 0.020 | |
| P235GH | ≤0.16 | 0.35 | ≤1.20 | 0.025 | 0.020 | |
| P265GH | ≤0.20 | 0.40 | ≤1.40 | 0.025 | 0.020 | |
physical requirement
| Mechanical properties for wall thickness T≤16 | ||||||
| Steel Grade | Tensile properties at room temperature | |||||
| Upper yield strength MPa | Tensile strength Mpa | Elongation % | ||||
| longitudinal | transverse | |||||
| P195GH | 195 | 320-440 | 27 | 25 | ||
| P235GH | 235 | 360-500 | 25 | 23 | ||
| P265GH | 265 | 410-570 | 23 | 21 | ||
Production technology
EN 10217 LSAW PIPE production process
1. Prepare the steel plate
Plate selection: Select high-quality steel that meets EN 10217 standards, usually non-alloyed high-quality steel
Steel plate inspection: Quality inspection of steel plates, including size, thickness, surface quality, chemical composition and mechanical properties.
2. Pretreatment of steel plate
Cutting: The steel plate is cut to the desired size and shape, usually using flame cutting or plasma cutting.
Edge processing: The edge of the steel plate is processed to ensure that the edge is smooth for subsequent molding and welding. Common machining methods include cutting, planing and milling.
Cleaning: Clean the surface of the steel plate, remove oil, rust and impurities, and ensure the quality of welding.
3.Form
JCOE molding process:
J forming: Gradually press one end of the steel plate into a J shape.
C forming type: The J-shaped steel plate is further pressed into a C shape.
O forming type: The C-shaped steel plate is pressed into an O shape to form a round tube blank.
Cold expansion: cold expansion of the O-shaped tube blank to ensure the dimensional accuracy and roundness of the tube blank.
UOE molding process:
U-shaped: Gradually press one end of the steel plate into a U-shaped shape.
O forming type: The U-shaped steel plate is further pressed into an O shape to form a round tube blank.
Expanding: Expanding the diameter of the O-shaped tube blank to ensure the dimensional accuracy and roundness of the tube blank.
4 Weld
Internal welding: The longitudinal submerged arc welding process is used to weld from the inside of the tube billet to form an internal weld.
External welding: The longitudinal submerged arc welding process is used to weld from the outside of the tube blank to form an external weld.
Welding parameter control: strictly control welding current, voltage, welding speed and other parameters to ensure welding quality.
5. Weld treatment
Weld grinding: The weld is polished to remove welding slag and spatter and ensure the surface of the weld is smooth.
Weld inspection: Non-destructive testing of the weld, such as ultrasonic inspection (UT), X-ray inspection (RT), magnetic particle inspection (MT) and penetration inspection (PT), to ensure that the weld is free of defects.
6 Heat treatment
Post-Weld Heat Treatment (PWHT) : Heat treatment of welded steel pipes to eliminate welding stress and restore the mechanical properties of the material. Common heat treatment methods include normalizing, tempering and tempering.
7. Inspection and testing
Dimensional inspection: The outer diameter, wall thickness, length and other dimensions of the steel pipe are inspected to ensure that they meet the requirements of EN 10217.
Appearance inspection: Check the quality of the steel pipe surface, including welds, surface defects, etc.
Non-destructive testing: non-destructive testing of the steel pipe to ensure that the weld and the pipe body are free of defects.
Water pressure test: water pressure test of the steel pipe to ensure that the steel pipe can withstand the design pressure, and test the tightness of the weld and the pipe body.
Mechanical properties test: tensile test, bending test and impact test of the steel pipe to ensure that the mechanical properties of the steel pipe meet the standard requirements.
8. Coating and anti-corrosion
Surface treatment: The surface of the steel pipe is sandblasted or shot peening to remove the surface oxide and impurities and improve the coating quality.
Coating: According to the use of the environment and requirements, the steel pipe is painted, the common coating materials include epoxy powder, polyurethane coating and so on.
Anti-corrosion treatment: Anti-corrosion treatment of the steel pipe, such as three-layer PE (polyethylene) anti-corrosion, epoxy powder anti-corrosion, etc., to ensure the service life of the steel pipe in harsh environments.
9. Packaging and transportation
Packaging: The steel pipe is packed to prevent damage during transportation.
Transportation: The steel pipe is transported to the designated place to ensure the safety of the transportation process.
10. Quality control and recording
Quality control: In the entire production process, strictly control the quality of each link to ensure that product quality meets the standard requirements.
Record: record the parameters and inspection results in the production process, establish the quality traceability system.
With these steps, EN 10217 LSAW PIPE ensures high quality and performance to meet the needs of a wide range of engineering applications.
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