TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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BS6323-6 Seamless Welded Precision Steel Tube Machining 35mm Wall Thickness
Standard for precision steel tube: 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 BS6323-6 Seamless and Welded Steel Tubes : Auto Industry Machinery Use Mechanical and General Engineering Purposes
Size range for BS6323-6 Seamless and Welded Steel Tubes : O.D.:6-350mm W.T.:1-35mm L:max12000mm
Method of Manufacture for BS6323-6 Seamless and Welded Steel Tubes :
The tubes are manufactured from flat rolled strip, longintudinally 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.
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
Delivery Condition for BS6323-6 Seamless and Welded Steel Tubes :
The tubes are supplied in one of the following condition:
a. Cold finished/hard (cod 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 for BS6323-6 Seamless and Welded Steel Tubes:
Flattening test
Drift expanding test
Leak tightness test.
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
| Chemical Compositions and mechanical properties | |||||||||||||||||
| Design ation | Chemical Compositions( ladle analysis) | Mechanical Properties | |||||||||||||||
| C | Si | Mn | P | S | BKc (cold finished/hard) | BKWc (cold finished/soft ) | GBK and GZF (annealed) | NBK and NZF (normalized) | |||||||||
| max. | max. | max. | max. | max. | Re min. | Rm min. | A min. | Re min. | Rm min. | A min. | Re min. | Rm min. | A min. | Re min. | Rm min. | A min. | |
| % | % | % | % | % | N/m m2 | N/m m2 | % | N/m m2 | N/m m2 | % | N/m m2 | N/m m2 | % | N/m m2 | N/m m2 | % | |
| 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 |
| Minimun expansion for drift expanding test | ||
| Designation | Expansion minimun 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 |
Production Pictures for BS6323-6 Seamless and Welded Steel Tubes
Production Process for BS6323-6 Seamless and Welded Steel Tubes
Production Workshop for BS6323-6 Seamless and Welded Steel Tubes
FAQ for Precision Steel Tube
1. who are we?
TORICH is not only professional manufacturer and exporter, but also international marketing and sales company in the field of steel tubes from China. Our factory was established in 1997, with the name of Haiyan Sanxin Steel Pipe Co., Ltd. Our technicians are equipped with great engineering experience in steel pipe industry for more than 22 years, they have great command of production technology for Cold Drawing and Cold Rolling, as well as heat treatment and inspection. So we have a strong technician team and manufacturing capability.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Stainless Steel/Carbon Steel/AlloySteel,Titanium,Copper/Brass,etc.
4. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FAS,CIP,FCA,CPT,DEQ,DDP,DDU,Express Delivery,DAF,DES;
Accepted Payment Currency:USD,EUR,JPY,CAD,AUD,HKD,GBP,CNY,CHF;
Accepted Payment Type: T/T,L/C,D/P D/A,MoneyGram,Credit Card,PayPal,Western Union,Cash,Escrow;
Language Spoken:English,Spanish,Japanese,Portuguese,German,Arabic,French,Russian,Korean,Hindi,Italian