BS6323-4 BK BKW GBK NBK GZF NZF Cold Finished Seamless Steel Tubes

Grade CFS3 CFS4 CFS5 CFS6 CFS7 

Standard: BS6323-4 Seamless and Welded steel tubes for automobile,mechanical and general engineering purposes
Part 4: Specific requirements for cold finished seamless steel tubes

Applications: for Auto industry / for machinery use/mechanical and general engineering purposes

Size range: O.D.:6-156mm W.T.:1-15mm L:max12000mm

Method of manufacture:

The tubes are manufactured by a seamless process and shall be cold finished

It is permissible for cold finished tubes to have on internal and external surfaces an adherent layer of residual to subsequent processing, then their removal shall be the subject of an agreement between the manufacturer and the purchaser.

Delivery Condition:

The tubes are supplied in one of the following condition:

a. Cold finished/hard (cold finished as drawn) : BK

b. Cold finished/soft (lightly cold worked ): BKW

c. Annealed: GBK

d. Annealed (including de-scaling): GZF

e. Normalized: NBK

f. Normalized ( including de-scaling): NZF

Tests:

Flattenning tests

Leak tightness test- Eddy current test