Speci-
fication |
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 |
Thick-
ness |
| 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% |
| BS:3059 Part2/1990 |
Steel 360 |
360 |
500 |
235 |
24 |
12 |
15 |
19 |
– |
0.17 |
0.10 |
0.35 |
0.40 |
0.80 |
.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 |
|
|
|
|
|
|
|
|
|
2.2
(Rm= meas–ured T.S. in N/mm2) |
5t |
4t |
Inner sur–face of tube to meet at middle |
17 |
11 |
0.08 |
0.25 |
|
|
0.35 |
1.40 |
|
+ 0%
– 1% |
+10%
–5%
(excl. the weld) |
| Steel 360 |
36.7
360 |
51
500 |
20.2
19.8 |
| |
| Rm : Tensile strength A : Elongation d : Inside diameter |
| |
