TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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Seamless and Welded Steel Tubes for Automobile, mechanical and General Engineering Purposes
Part 8: Specific requirements for longitudinally welded stainless steel tubes
Method of Manufacture:
The tubes are manufactured from flat rolled strip, longitudinally welded across the abutting edges without the addition of filler metal.
Delivery condition:
a) As-welded and sized: KM
b) Welded and sized (fully softened): GKW(S)
c) Welded and sized (fully softened) (including de-scaling): GZF(S)
d) Cold finished(fully softened): GBK
e) Cold finished(fully softened) (including de-scaling): GZF(S)
Steel Grade and Chemical Compositions:
Note: Special steel grade is also available, according to customer request
| Mechanical properties | ||||||||||
| Designation | BS 1449-2: | KM (as welded) | GKM(S),GZF(S)(welded and sized fully softened) | GBK (S),and GZF(S)(cold finished ,fully softened) | ||||||
| Re min. | Rm min. | A min. | Re min. | Rm min. | A min. | Re min. | Rm min. | A min. | ||
| N/mm2 | N/mm2 | % | N/mm2 | N/mm2 | % | N/mm2 | N/mm2 | % | ||
| LW 12b |
| 300 | 400 | 10 | _ | _ | _ | _ | _ | _ |
| LW 19b | 409S19 | 300 | 400 | 10 | 200 | 350 | 20 | _ | _ | _ |
| LW 20 | 304S11 | 420 | 520 | 25 | 185 | 480 | 30 | _ | _ | _ |
| LWCF 20 |
|
|
|
|
|
|
| 185 | 480 | 30 |
| LW 21 | 304S15 | 450 | 560 | 25 | 210 | 510 | 30 | _ | _ | _ |
| LWCF 21 |
|
|
|
|
|
|
| 210 | 510 | 30 |
| LW 22 | 316S13 | 420 | 520 | 25 | 185 | 480 | 30 | _ | _ | _ |
| LWCF 22 |
|
|
|
|
|
|
| 185 | 480 | 30 |
| LW 23 | 316S33 | 450 | 560 | 25 | 210 | 510 | 30 | _ | _ | _ |
| LWCF 23 |
|
|
|
|
|
|
| 210 | 510 | 30 |
| LW 24 | 321S31 | 450 | 560 | 25 | 210 | 510 | 30 | _ | _ | _ |
| LWCF 24 |
|
|
|
|
|
|
| 210 | 510 | 30 |
| Tolerance on specified cut lengths | |||
| Specified cut length | Tolerance | ||
| 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. | |||
BS6323 Specifications for
Seamless and welded steel tubes for automobile, mechanical and general engineering purposes
BS6323-1 Part 1: General requirements
BS6323-2 Part 2: Specific requirements for hot finished welded steel tubes
BS6323-3 Part 3: Specific requirements for hot finished seamless steel tubes
BS6323-4 Part 4: Specific requirements for cold finished seamless steel tubes
BS6323-5 Part 5: Specific requirements for electric resistance welded including induction welded steel
tubes
BS6323-6 Part 6: Specific requirements for cold finished electric resistance welded including induction
welded steel tubes
BS6323-7 Part 7: Specific requirements for submerged arc welded steel tubes
BS6323-8 Part 8: Specific requirements for longitudinally welded stainless steel tubes