BS6323-6 Cold Finished Electric Resistance DOM Steel Tubes with BK , BKW ,GBK , GZF , NBK , NZF
Product Details
drawn over mandrel steel tube
,drawn over mandrel steel tubing
BS6323-6 DOM Steel Tubes Cold Finished Electric Resistance Welded Steel Tubes with BK , BKW , GBK , GZF , NBK , NZF
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
Applications: for Auto industry / for machinery use/mechanical and general engineering purposes
Size range: O.D.:6-350mm W.T.:1-35mm L:max12000mm
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.
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
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.
Testing:
Flattening test
Drift expanding test
Leak tightness test.
| Chemical Compositions and Mechanical Properties | |||||||||||||||||
| Design | Chemical Compositions( ladle analysis) | Mechanical Properties | |||||||||||||||
| C | Si | Mn | P | S | BKc | BKWc (cold finished/soft ) | GBK and GZF (annealed) | NBK and NZF (normalized) | |||||||||
|
| max. | max. | max. | max. | max. | Re min. | Rm | A | Re min. | Rm | A | Re | Rm | A min. | Re | Rm | A |
|
| % | % | % | % | % | N/m | N/m | % | N/m | N/m | % | N/m | N/m | % | N/m | N/m | % |
| CEW1a | 0.13 | __ | 0.60 | 0.050 | 0.050 | 320 | 400 | 6 | 245 | 350 | 10 | 150 | 270 | 27 | 155 | 280 | 25 |
| CEW2a | 0.16 | __ | 0.70 | 0.050 | 0.050 | 355 | 420 | 6 | 260 | 370 | 10 | 160 | 300 | 27 | 195 | 320 | 25 |
| CEW3a | 0.20 | 0.35 | 0.90 | 0.050 | 0.050 | 360 | 450 | 6 | 280 | 400 | 9 | 170 | 340 | 26 | 215 | 360 | 24 |
| CEW4b | 0.25 | 0.35 | 1.20 | 0.050 | 0.050 | 415 | 520 | 5 | 315 | 450 | 8 | 200 | 400 | 24 | 235 | 410 | 22 |
| CEW5b | 0.23 | 0.50 | 1.50 | 0.050 | 0.050 | 480 | 600 | 4 | 385 | 550 | 6 | __ | __ | __ | 340 | 490 | 20 |
| Tolerance on diameter | ||
| diameter | Tolerance | |
| over | Up to and including | |
| mm | mm | mm |
| 30 | ±0.10 | |
| 30 | 50 | ±0.15 |
| 50 | 70 | ±0.20 |
| 70 | 90 | ±0.25 |
| 90 | 110 | ±0.30 |
| 110 | 130 | ±0.35 |
| 130 | 160 | ±0.45 |
| 160 | 190 | ±0.55 |
| 190 | 220 | ±0.65 |
| 220 | 250 | ±0.75 |
| Tolerance on specified cut lengths | |||
| Specified cut length | Tolerance(mm) | ||
| over | up to and including | ||
| mm | mm | mm | |
| 500 | + | 2 | |
| - | 0 | ||
| 500 | 2000 | + | 3 |
| - | 0 | ||
| 2000 | 5000 | + | 5 |
| - | 0 | ||
| 5000 | 7000 | + | 10 |
| - | 0 | ||
| 7000 | __ | by agreement | |
| NOTE Closer tolerances may be obtained by agreement between the purchaser and manufacturer. | |||
| Distance between platens for flattening test | |
| Designation | Distance between platens |
| % | |
| CEW 1 | 66 |
| CEW 2 | 75 |
| CEW 3 | 85 |
| CEW 4 | 85 |
| CEW 5 | 85 |
| Minimum expansion for drift expanding test | ||
| Designation | Expansion minimum for tube thickness | |
| Up to and including 4mm | Over 4 mm up to and including 8 mm | |
| % | % | |
| CEW 1 | 12 | 8 |
| CEW 2 | 12 | 8 |
| CEW 3 | 10 | 6 |
| CEW 4 | 8 | 5 |
| CEW 5 | 8 | 5 |
Note: Special steel grade is also available, according to customer request.
For Application of:
Publications referred to:
BS 3601
BS 3602
BS 3603
BS 3604
BS 3605
BS 4360
BS 4848
BS 4848-2
BS 5135
BS 6323
BS 6323-1
BS 6363
ISO 4200
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