Duplex Steel Pipe

ASTM A213

Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes (1/8”-5”)

Seamless stainless steel pipe is made from solid stainless steel bar which is called billet. By using different processing techniques such as extruding, gun drilling or piercing, the steel bars are produced to be steel tubes.

1. Firstly, the billets would be inspected exactly.

2. Then put the billets into the heat to raise the temperature.

3. The hot billets would then be pierced through the center with a mandrel. Through this procedure, the bar shape billet becomes hollow shape billet.  

4. The next step is rolling and stretching the hollow billet. The billet is precisely rolled and stretched until it meets all the specifications with length, diameter and wall thickness according to requirements.

Seamless stainless steel pipe should be manufactured to applicable standards and fully tested for potential defects before being prepared for shipment to the customer.

Hydrotest

After the tube is fully formed to the desired specification it is hydrostatically tested to ensure integrity.  Hydrostatic testing determines and verifies the tubing meets the specification.  Several types of information can be obtained through this verification process.  Key inspection data can be identified through the hydrotest process, such as:

Material flaws  

Mechanical properties

Specific hard spots that can fail when hydrogen is present

Finishing

Stainless steel coil tubing can be level wound on spools for shipment or straightened

and cut to specific lengths designated by the customer.  

Products can be polished and stenciled with pertinent information for lot traceability and manufacturing identification.

  - Chemical plants  

  - Aviation fields
  - Marine equipment
  - Cryogenic transportation
  - Medical & architectural industries
  - High-Pressure Fuel Lines
  - Hydraulic Control Applications