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BS6323-2 HFW2 HFW3 HFW4 HFW5 Hot Finished Welded Steel Tubes for Automobile
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
Method of Manufacture:
The tubes are manufactured from flat rolled strip with longitudinal sea weld by a continuous process without the addition of filler metal, and shall be hot finished.
Delivery Condition:
The tubes are supplied in the hot finished condition.
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 |
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26.9 | 2.3 | 2.6 | 3.2 | 3.2 |
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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 | ||||||
Tests
Flattening test
Bend test (whole tube)
Distance between platens for flattening test | |
Designation | Distance between platens |
| % |
HFW 2 | 75 |
HFW 3 | 85 |
HFW 4 | 85 |
HFW 5 | 85 |
Publications referred to:
BS 3602-1, Seamless fir steel pipes and tubes for pressure purposes: carbon and carbon manganese steel with specified elevated temperature properties
BS 3602-1, Seamless electric resistance welded and induction welded tubes
BS 3602-2, Submerged arc welded tubes
BS 3603, Specification for steel pipes and tubes for pressure purposes: carbon and alloy steel with specified low temperature properties
BS3604, Specification for steel pipes and tubes for pressure purposes: ferritic alloy steel with specified elevated temperature properties.
BS3605, Seamless and welded austenitic stainless steel pipes and steel tubes for pressure purposes
BS4360, Specification for weldable structural steels
BS4848, Hot-rolled structural steel sections
BS4848-2, Hollow sections
BS5135, Metal-arc welding of carbon and carbon manganese steels
BS6323, Specification for seamless and welded steel tubes for automobile, mechanical and general engineering purposes
BS6323-1, General requirements
