Classification and specifications of stainless steel decorative pipes

Stainless steel decorative pipes are also called stainless steel welded steel pipes, or welded pipes for short. They are usually made by welding steel or steel strips after being rolled and formed by a machine and a die. The production process of welded steel pipes is simple, the production efficiency is high, there are many varieties and specifications, and the equipment investment is low, but the general strength is lower than that of seamless steel pipes.

1. Classification by production method:
(1) Seamless pipes – cold drawn pipes, extruded pipes, cold rolled pipes.
(2) Welded pipes:
(a) Classification by process – gas shielded welded pipes, arc welded pipes, resistance welded pipes (high frequency, low frequency).
(b) Classification by weld seams – straight seam welded pipes, spiral welded pipes.
2. Classification by cross-sectional shape: (1) round steel pipes; (2) rectangular pipes.

3. Classification by wall thickness – thin-walled steel pipe, thick-walled steel pipe

4. Classification by use:

(1) Civil pipes are divided into round pipes, rectangular pipes, and flower pipes, generally used for decoration, construction, structure, etc.;
(2) Industrial pipes: industrial piping steel pipes, general piping steel pipes (drinking water pipes), mechanical structure/fluid conveying pipes, boiler heat exchange pipes, food hygiene pipes, إلخ. Generally used in various industrial fields such as: petrochemical, papermaking, nuclear energy, food, beverage, pharmaceutical and other industries with high requirements for fluid media pipelines.

1.1. Seamless steel pipe
Stainless steel seamless pipe is a long steel strip with a hollow cross-section and no seams around the periphery.

1. Seamless Steel Pipe Manufacturing Process and Flowchart:
Smelting > Ingot > Rolling > Sawing > Peeling > Piercing > Annealing > Pickling > Plastering > Cold Drawing > Cutting > Pickling > Warehousing

2. Characteristics of Seamless Steel Pipe:
From the above process flow, it is easy to see that: First, the thicker the wall thickness, the more economical and practical it is. The thinner the wall thickness, the significantly higher the processing cost. Second, the manufacturing process itself determines its limitations. Generally, seamless steel pipes have low precision: uneven wall thickness, low internal and external glossiness, high cut-to-length costs, and pitting and black spots on the internal and external surfaces that are difficult to remove. Third, testing and shaping must be performed offline. Therefore, it demonstrates its superiority in high-pressure, high-strength, and mechanical structural applications.

1.2. Welded Steel Pipe
Welded steel pipe, also known as welded pipe, is a stainless steel pipe made by welding steel plates or strips through a rolling mill and die. 1. Manufacturing Process and Flow of Welded Steel Pipe: Steel Plate > Strip Cutting > Forming > Welding > Induction Bright Heat Treatment > Internal and External Weld Bead Treatment > Shaping > Sizing > Eddy Current Testing > Laser Diameter Measurement > Pickling > Warehousing

2. Characteristics of Welded Steel Pipe:
From the above process flow, it is easy to see that: First, this product is produced continuously online. The thicker the wall, the greater the investment in the production line and welding equipment, making it less economical and practical. The thinner the wall, the lower the input-output ratio. Second, the manufacturing process determines its advantages and disadvantages. Generally, welded steel pipes offer high precision, uniform wall thickness, high internal and external brightness of stainless steel pipe fittings (the surface brightness of the steel pipe is determined by the surface grade of the steel plate), and can be customized to any length. Therefore, they demonstrate economical and aesthetic benefits in high-precision, medium- and low-pressure fluid applications.

Nominal Stainless Steel Pipe Size: OD * Wall Thickness

Specifications:

304 Stainless Steel Square Pipe Specification Table

Product Name, Specification, Model, Standard Name, Standard Number
Stainless Steel Pipe, Φ6-630 x 1-50mm, Stainless Steel Pipe for Fluid Transportation, GB/T14976-2002
Stainless Steel Pipe, Φ6-630 x 1-50mm, Seamless Stainless Steel Pipe for Structural Use, GB/T14975-2002
Stainless Steel Pipe, Φ6-630 x 1-50mm, Stainless Steel Pipe for Boilers and Heat Exchangers, GB13296-91
Stainless Steel Welded Pipe, Φ219-1200 x 3-20mm, Stainless Steel Pipe for Fluid Transportation, GB12770-2002