Spirally welded steel tubes for pipe lines

Execution standards

SREN 10 217/5
Welded steel tubes for pressure purposes. Technical delivery conditions. Part 5: Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
Dimensions and linear weight According to SREN 10217-5
Steel
P235GH, P265GH

DIN 1626 Non-alloy steel tubes with special quality requirements
Dimensions and linear weights According to DIN 2458
Steel St 37.0, St 44.0, St 52.0

UNI 6363 Welded steel tubes for water mains
Dimensions and linear weights According to UNI 6363
Steel FE 360, FE 410, FE 510

 

1. Dimensions and linear weights

Outside diameter
mm
Wall thickness , mm
4,80 5,20 5,60 6,40 7,10 7,90 8,70 9,50 10,30 11,10 11,90 12,50 14,20
Linear weight (Kg/ml)
219 25,37 27,43 29,48 33,57 37,12 41,14 - - - - - -
273 31,76 34,35 36,94 42,09 46,57 51,67 - - - - - - -
323 - 40,87 43,96 50,11 55,47 61,56 67,62 - - - - - -
355 - 44,93 48,33 55,11 61,02 67,74 74,42 - - - - - -
406 - 51,45 55,35 63,13 69,91 77,63 85,32 92,98 100,61 108,20 115,77 121,42 -
457 - - 62,34 71,12 78,77 87,49 96,18 104,84 113,46 122,05 130,62 137,02 -
508 - - 69,38 79,16 87,70 97,43 107,12 116,78 126,41 136,01 145,58 152,74 -
610 - - - 95,26 105,56 117,30 129,00 140,68 152,32 163,93 175,51 184,19 -
711 - - - 111,20 123,24 136,97 150,67 164,34 177,98 191,58 205,15 215,32 244,01
813 - - - - 141,10 156,84 172,56 188,24 203,88 219,50 235,09 246,76 279,73
914 - - - - 158,79 176,52 194,22 211,90 229,54 247,15 264,72 277,90 315,10
1016 - - - - - 196,39 216,11 235,79 255,45 275,07 294,66 309,34 350,82
1118 - - - - - - - 259,69 281,35 302,99 324,59 340,79 386,54
1219 - - - - - - - 283,35 307,01 330,63 354,23 371,92 421,91
1321 - - - - - - - 307,26 332.93 358,57 384,18 403,36 457,63
1422 - - - - - - - 330,91 358,57 386,20 413,80 434,50 493,00
1524 - - - - - - - 354,82 384,50 414,14 443,75 465,94 528,72
1626 - - - - - - - - 410,38 442,04 473,66 497,39 565,44

 



2. Lenghts

- manufacture lenghts
6 - 12,5 m
- fixed lenghts within manufacture lenghts range


3.Chemical requirements for liquid steel - %

Steel grade

C

Si max.

Mn

P max.

S max.

Alphanumeric
symbols

Numeric
symbols

P 235 GH

1.0345

≤0,16

0,35

≤1,20

0,025

0,020

P 265 GH

1.0425

≤0,20

0,40

≤1,40

0,025

0,020


4.Mechanical characteristics at normal temperature for wal thickness up to 40 mm, including

Steel grade

Tensile strenght caracteristics at a normal temperature

Impact bend caracteristics

Alphanumeric
symbols

Numeric
symbols

Superior yield limit  or conventional yield limit
ReH or Rp0,2
for T(mm)
min

Tensile
strenght

Rm

Elongation
A
min.

 

%

Medium absorbed
energy
KV
J
At a temperature
of de °C
                        
        l                                              t

T≤16

16<T≤40

20

0

-10

20

0

MPa

MPa

MPa

l

t

P235GH

1.0345

235

225

360...500

25

23

-

40

28

-

27

P265GH

1.0425

265

255

410...570

23

21

-

40

28

-

27




5. The values of minimum conventional yield limit, Rp0,2 at a rise temperature for wall thickness T up to 40mm, inclusive

Steel grade

Conventional yield limit, Rp0,2
Mpa
At a temperature of °C

Alphanumeric
symbol

Numeric
symbol

100

150

200

250

300

350

400

P235GH

1.0345

198

187

170

150

132

120

112

P265GH

1.0425

226

213

192

171

154

141

134

 

6. Hydrostatic test pressure (bar)

   The maximum hydrostatic test pressure value is of maximum 70 bari, depending on the type of steel,  wall thickness and the diameter of the pipe.The time of maintaining the hydrostatic test pressure is of minimum 5 seconds for pipes with external diameter ≤ 457mm and minimum 10 seconds for greater diameters.


 

Protection, marking, documents, delivery

- The pipes are delivered unprotected or coated with extruded polyethylene for temperatures up to 70°C.
- the pipes are delivered with bevelled ends to an angle of 30 degrees +/- 5 degrees, keeping a front ring of 1.60 +/- 0,80 mm;
- each pipe will be marked - stencilled and painted at about 300 mm from one of the ends;
- each lot of pipes will be accompanied by the mill test certificate according to EN 10204/DIN 50049;
- the delivery will be made by railway, truck or ship.

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