CEW TUBES

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Manufacturing

The Cold Drawn Electric Welded (CEW) tubes are uniquely used in various applications requiring High Precision Dimensional tolerances, excellent surface finish, high tensile properties and non standard sizes.

The ERW fin cut tube is the initial raw material for CEW tube production. It undergoes various production stages like annealing, pickling, phosphating, lubricating, swaging and finally drawing.

The final size is achieved by multiple drawing operations; during intermediate pass the entire process from Annealing to swaging is repeated. The tubes are then straightened, cut and supplied as, As Drawn or As Annealed condition. For cylinder bore tubes reactive oil is used for lubrication, hence it’s also called oil drawn cylinder bore tubes. After final inspection, tubes are oiled, packed and dispatched.

CEW Tubes Process
CEW Tube Size Chart

Technical Details

OD : Min. 10.00 mm to Max. 74.00 mm
Thickness : Min. 0.80 mm to Max. 4.20 mm

RAW MATERIAL SPECIFICATION
EQ. STD. INDUSTRY INDIAN
IS		 BRITISH BS JAPANESE JIS GERMAN DIN AMERICAN ASTM
Automobile Tubes IS 3074/1979 BS 6323/1982 JIS G 3445/1983 DIN 2393/1994
DIN 2394/1994		 ASTM A 513/1988
Shock Absorber Tubes IS 3074/1979 BS 6323/1982 P-6 JIS G 3445/1984 DIN 2393/1994 ASTM A 513/1988
Boiler Tubes IS 1914/1982 BS 3059/1987 JIS G 3461/1984 - ASTM A 513/1988
ASTM A 214/1988
Air Heater Tubes IS 3601/1984 BS 3059/1987 JIS G 3461/1984 DIN 1717 ASTM A 214/1988
Bicycle Tubes IS 2039/1981 BS 1717/1983 - - -
General Engg. Tubes IS 3601/1984 BS 6323/1982 JIS G 3445/1983 DIN 2393/1994
DIN 2394/1994		 -
Transformer Tubes IS 8036/1976 - - - -
Furniture Tubes IS 7138/1973 - JIS G 3445/1983 - -
Sectional Tubes IS 4923/1985 - JIS G 3466/1982 - ASTM A 500 Gr.A/1989
Structural Tubes IS 1161/1979 BS 4360 JIS G 3444/1982 - ASTM A 500 Gr.A/1989
End Application

Heat Exchanger

Boiler

Air Preheater

Gas Line