L290 Straight Seam Welded Steel Tube
Ensuring the quality and reliability of raw materials in the manufacturing process of L290 Straight Seam Welded Steel Tube involves several critical steps:
Raw Material Selection: The process begins with the selection of high-quality steel strips or plates that meet the chemical and mechanical property requirements specified by the API 5L or relevant standards. The raw materials are subject to strict physical and chemical inspections before input to ensure they conform to the required specifications for elements such as carbon, manganese, phosphorus, sulfur, and silicon .
Milling and Edge Preparation: The edges of the steel strip or plate are milled to achieve the required parallelism and groove shape, which is essential for proper welding .
Forming: The steel strip is then formed into a round shape through a series of rollers. This process may involve external control or internal control roll forming to ensure the accuracy of the tube's diameter and wall thickness .
Welding: The formed tube is welded along the seam using high-frequency induction welding or submerged arc welding. The welding process is closely monitored to ensure the weld's quality and integrity. Welding quality is critical and can be influenced by factors such as raw materials, forming and welding process, and heat treatment technology .
Non-Destructive Testing (NDT): The welded seams are inspected using online continuous ultrasonic automatic damage instruments to ensure 100% non-destructive testing coverage of the welds, preventing the production of defective products .
Heat Treatment: Post-weld heat treatment may be applied to reduce residual stresses and improve the pipe's toughness and ductility .
Hydrostatic Testing: The pipes may undergo hydrostatic testing to ensure they can withstand the pressure they will be subjected to in service .
| Thickness | 2-6mm thickness |
| Diameter | 6-150mm |
| Length | 4-10m or as costumer require |
| Tolerance | 1% |
FAQ：
Q: Do you have quality control system?
A: Yes,we have iso,bv,sgs certifications and our own quality contorl laboratory.
Q: How long is your delivery time?
A: Within 7-15 days after receiving the deposit or L/C at sight. Longer lead time will be required for special designed product
Q: Do you provide samples? is it free or extra?
A:Yes, we could offer the sample for free charge but the delivery charges will be covered by our customers.
Q: Do you provide after-sale service?
A: We provide after-sales service and offer 100% guarantee on our products.
Hot Tags: l290 straight seam welded steel tube, China l290 straight seam welded steel tube manufacturers, suppliers, A691 Welded Steel Pipe, SPRIAL STEEL PIPE, JIS G3101, Carbon and Alloy Steel Pipe, P12 Alloy Steel Pipe, GB T1591 2009
You Might Also Like
Send Inquiry