Steel Tubes for Boiler and Super Heater
BS 3059 — Steel Tubes for Boiler and Super Heater
BS 3059 specifies requirements for steel tubes used in boiler and super heater applications, covering both Electric Resistance Welded (ERW) and Cold Drawn Electric Welded (CEW) processes. Also covers IS:1914–1982 Part IV requirements for Steel 320 and Steel 360 grades.
| Specification | Grade | Rm N/mm² |
Re N/mm² |
A% | |||||||||||||||||
| Direct Expansion Test Increase in D as % |
Chemical Composition | Tolerance | |||||||||||||||||||
| d/D ratio | C% | Si% | Mn% | P&S% | Outside Diameter | Thickness | |||||||||||||||
| Min. | Max. | Min. | Max. | £ 0.6 | > 0.6 £ 0.8 |
> 0.8 | Min. | Max. | Min. | Max. | Min. | Max. | |||||||||
| BS:3059 Part2/1987 |
Steel 320 | 320 | 480 | 195 | 25 | – | 0.16 | – | 0.35 | 0.30 | 0.70 | – | ERW ±0.75% with a minimum of ±0.30mm CEW ±0.5% with a minimum of ±10mm |
u.t.i. 3.2mm ±10% and over 3.2mm ±7.5% ±7.5% |
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| BS:3059 Part2/1990 |
Steel 360 | 360 | 500 | 235 | 24 | 12 | 15 | 19 | – | 0.17 | 0.10 | 0.35 | 0.40 | 0.80 | 0.035 | ERW Same as part II Class 2 of 1987 CEW Same as part I of 1987 |
±10% (excluding welded area) Same as part I of 1987 | ||||
| IS:1914–1982 Part IV |
Steel 320 | 32.64 320 |
48.96 480 |
17.95 176 |
100 – Rm 9.81 |
CEW | |||||||||||||||
| ERW | t > 3.2 mm |
t ≤ 3.2 mm |
D ≤ 63.5 |
D > 63.5 |
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| 2.2 (Rm = measured T.S. in N/mm²) |
5t | 4t | Inner surface of tube to meet at middle | 17 | 11 | 0.08 | 0.25 | 0.35 | 1.40 | + 0% – 1% |
+10% –5% (excl. the weld) |
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| Steel 360 | 36.7 360 |
51 500 |
20.2 19.8 |
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| Rm: Tensile strength A: Elongation d: Inside diameter | |||||||||||||||||||||
Supply
Available in Steel 320 and Steel 360 grades conforming to BS:3059 Part 2 (1987 & 1990) and IS:1914–1982 Part IV. ERW and CEW versions supplied on request. Custom sizes and lengths available to meet specific boiler and super heater requirements.