Seamless Stainless Steel Tube

 Features of Seamless Steel Tube:

• A large stock of pipes ready for call-off 
• Pipes manufactured to specified dimensions on request 
• Pipes can be produced in high quality alloys 
• Pipes can be supplied in a variety of finishes 
• Pipes can be cut to size on our premises ready for immediate supply 
• Worldwide shipping 
• Pipes produced to ISO 9001:2000 quality specification 

Specifications of Seamless Stainless Steel Tube:

1. Standard:   GB/T14975-2002,GB/T14976-2002,GB13296-2007
                         GB9948-2006,GB5310-95
                         ASTM A312,ASTM A213,ASTM A269,ASTM A511
                         ASTM A789,ASTM A790
                        JIS3463,JIS3459,
                        DIN2462,DIN17458,DIN17456

2. Grade: 304/304L/ 321/321H/310S/347H /2205/316/316L/316Ti/317L/TP410 /TP420 etc

3. OD range:  6mm-762mm 

4. Wall thickness range:  0.5-50mm 

5. Length: max.18000mm or as demand

6.Surface finish:  Polishing (180#,220#,240#,320#400#,600#), Hairline, aid pickling and so on

7. Manufacture technology: cold drawn/cold rolled/hot rolled

Applications of Seamless Stainless Steel Pipe: 

A) General Service Industries (Petroleum, Food, Chemical, Paper, Fertilizer, Fabric, Aviation and Nuclear)
B) Fluid, gas and oil transport
C) Pressure and Heat Transmission
D) Construction and Ornament
E) Boiler Heat Exchanger

The use of seamless stainless steel pipe has expanded into new applications, such as light industry, foodstuff, home electric appliances, kitchen articles, construction and decorations, railroad vehicles; some seamless stainless steel pipe/tube which has excellent corrosion resistant, mechanical properties are suitable to produce general purpose parts, cutting tools, mechanical parts, petroleum refining equipment, bolts and nuts, pump rods, and kitchenware.

Manufacturing Process of Stainless Steel Pipe:

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 posited to impart extra corrosion resistance. Thereafter every tube is electrically marked with material grade, size and manufacturing standard.

Technical notes:

Chemical Composition: 

Normal Tolerence of Seamless Stainless Steel Pipe/Tube :

Our Products:

Export Markets
Our target market is the international market. Every year we export most of products to the world.

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