Precision Round Seamless 30mm Steel Tubes / Hot Finished Welded Type Tubes
Standard: BS6323-2 Seamless and welded steel tubes for Automobile, Mechanical and General Engineering purposes
Part 2: Specific Requirements for Hot Finished Welded Steel Tubes
Applications: for Auto industry / for machinery use/mechanical and general engineering purposes
Size range: O.D.:6-350mm W.T.:1-30mm L:max12000mm
| Design | Chemical Compositions( ladle analysis) | Mechanical | ||||||
| Cmax. | Simax. | Mnmax. | Pmax. | Smax. | Remin. | Rmmin. | Amin. | |
| % | % | % | % | % | N/mm2 | N/mm2 | % | |
| HFW 2 | 0.16a | ~ | 0.70 | 0.050 | 0.050 | 195 | 320 | 25 |
| HFW 3 | 0.20a | 0.35 | 0.90 | 0.050 | 0.050 | 215 | 360 | 24 |
| HFW 4 | 0.25 | 0.35 | 1.20 | 0.050 | 0.050 | 235 | 410 | 22 |
| HFW 5b | 0.23 | 0.35 | 1.50 | 0.050 | 0.050 | 340 | 490 | 20 |
| NOTE Welding of tubes of these grades does not require special techniques but care should be taken and welding should be carried out in accordance with the guidance given in the appropriate British Standard for welding,e.g. BS 5135. aIf rimming or semi-killed steel is used for grade 2,the carbon content may be increased to 0.19%,and if used for grade 3,to 0.23%.bGrain refining elements may be added to this grade at the option of the manufacturer. | ||||||||
| Dimensions of hot finished welded steel tubes | ||||||
| Outside | Designation HFW 2 and 3 | Designation HFW 4 and 5 | ||||
| Thicknesses | Thicknesses | |||||
| mm | mm | mm | mm | mm | mm | mm |
| 21.3 | 2.0 | 2.6 | 3.2 | 3.2 |
|
|
| 26.9 | 2.3 | 2.6 | 3.2 | 3.2 |
|
|
| 33.7 | 2.6 | 3.2 | 4.0 | 2.6 | 3.2 | 4.0 |
| 42.4 | 2.6 | 3.2 | 4.0 | 2.6 | 3.2 | 4.0 |
| 48.3 | 2.9 | 3.2 | 4.0 | 3.2 | 4.0 | 5.0 |
| 60.3 | 2.9 | 3.6 | 4.5 | 3.2 | 4.0 | 5.0 |
| 76.1 | 3.2 | 3.6 | 4.5 | 3.2 | 4.0 | 5.0 |
| 88.9 | 3.2 | 4.0 | 5.0 | 3.2 | 4.0 | 5.0 |
| 114.3 | 3.6 | 4.5 | 5.4 | 3.6 | 5.0 | 6.3 |
| 139.7 | 6.3 | 6.3 | ||||
| NOTE For sectional properties including mass per unit length,see appendix B of BS 6323-1:1982 | ||||||
| Distance between platens for flattening test | |
| Designation | Distance between platens |
|
| % |
| HFW 2 | 75 |
| HFW 3 | 85 |
| HFW 4 | 85 |
| HFW 5 | 85 |
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