BS6323-6 DOM Steel Tubing Cold Finished Electric Resistance Welded Steel Tubes
Standard: BS6323-6 Seamless and Welded Steel Tubes for Automobile,Mechanical and General Engineering Purposes Part 6: Specific requirements for cold finished electric resistance welded(including induction welded) steel tubes
Steel Grade:CEW1a CEW2a CEW3a CEW4a CEW5a
Size Range: OD: 5.0-329mm WT:0.5-30mm Length: max 12000mm
Method of Manufacture:
The tubes are manufactured from flat rolled strip, longitudinally welded continuously by the passage of an electric current
across the abutting edges without the addition of filler metal.
They are subsequently cold finished normally on both the inside and outside surfaces, where it is permissble to have both
an adherent layer of residual lubricant originating from the drawing process and visible traces of the internal weld upset.
If phosphate or other residues are detrimental to subsequent processing, their removal shall be the subject of an agreement
between the manufacturer and purchaser.
The tubes are supplied in one of the following condition:
Cold finished/hard (cold finished as drawn) : BK
Cold finished/soft (lightly cold worked ): BKW
Annealed (including de-scaling): GZF
Normalized ( including de-scaling): NZF
It is permissible for tubes supplied in the GBK and NBK conditions to be discoloured, but they shall be free from loose scale.
Where tubes, in the GBK condition are required bright annealed, this shall be the subject of an agreement between the
purchaser and the manufactuer.
DOM(weld drawn-over-mandrel) Steel Tubing Characteristic: Good concentricity Good OD and ID tolerance High Precision Stable quality Smooth Roughness
Seamless tube and Cold Drawing or Cold Rolling Production