super stainless steel boiler tube.,super duplex stainless steel flexible tube/pipe

super stainless steel boiler tube

Specifications of super stainless steel boiler tube:

1. Standard:

ASTM A213, ASTM A312, ASTM A269, ASTM A789, JIS G3448, JIS G3456,

JIS G3459, JIS G3463, DIN 10216, DIN 17458

2. Grade:  201,202,301, 321, 304, 304L, 316, 316L, 409, etc

3. OD range: 8mm-101.6mm

4. Wall thickness range: 0.3mm-2.0mm

5. Length:  as demand 

6. Surface finish: pickling, annealing, manual polish and mechanical polish, mirror polish

7. Manufacture technology: hot rolled, cold drawn

8. Type: Seamless & Welded 

Applications of super stainless steel boiler tube :

1).Petroleum, Chemical enterprise, super heater of boiler, heat exchanger

2).High temperature resistant transmission fluid pipe in power station

3).Ship with pressure pipe

4).The exhaust purification device

5) Construction and ornament

Manufacturing Process of super stainless steel boiler tube :

The process commences with the formation of welded mother tube on the tube mill from imported and tested prime quality stainless steel strips. The latest TIG multi electrode welding technique is employed for superior weld quality and 100% Fusion, with argon purging, No filler metal added.

These mother tubes are solution annealed at 1060 D. 1100 D. C in continuous annealing furnace followed by immediate quenching to prevent chromium carbide precipitation.

Annealing of mother tuber ensures:

A) Removal of stress induced during tube forming and cold drawing:

B) Sufficient ductility and softness for cold drawing:

C) Transformation of the weld zone to austenitic nature,

D) Re crystallization of metallic grains to original form and thereby improving corrosion resistance.

During annealing, scales are formed on the surface of the tubes. In order to remove these, the tubes are pickled by immersing into hot pickling solution made of nitric acid, sulphuric acid and hydrofluoric acid.

The tubes are then coated with proper lubricant and then cold drawn over a drew bench:

1) To vary the metallurgical structure and restore the properties to the parent material:

2) To achieve a tube having closer dimensional tolerances:

3) To achieve a tube having closer dimensional tolerances:

4) To produce tubing of smaller size and wall thickness.

5) To reorient the grain structure of weld portion with that of the parent material and

6) To remove/minimize the internal bead.

Drawing is followed by subsequent annealing and pickling to restore the properties of the entire tube to that of the parent material. The tubes are then passiated to impart extra corrosion resistance. Thereafter every tube is electrically marked with material grade, size and manufacturing standard.

Technical Notes:

Chemical composition & Mechanical Property

SMC's promise: 

As the word leading manufacturer and supplier, Shanghai Metal Corporation makes“Service,Management,Craftsmanship."  In our commitment to deliver world class service, SMC's Quality Control Department not only promise to provide the best quality products, excellent customer services,  fast and reliable deliveries, and reasonable prices; but also goes the extra step to provide environment conscious products that will improve lives.

Our Products:

Package of Stainless Steel Tube/Pipe
Please don’t worry that our products are packed, stored, transported according to the international regulation. We do care about the quality of our products; even some little details are paid attention to.
We wrap the stainless steel products with anti-rust paper and steel rings to prevent damage. Identification labels are tagged according to standard specification or customer's instructions. Special packing is available as per customer's requirement.
Plus, our storage racks are made of wood. Other kinds of metals are settled in other places, far from the stainless steel. Any unwanted chemical reaction can be prevented.