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EN 10217-7 TUBES

 Welded Steel Tube forpressure purposes-Technical delivery conditions

 Part 7: Stainless Steel Tubes


EN 10217-7 standard has been written for manufacturers, designers, engineers,quality managers and others working in areas that involve high pressure, abrasive conditions, both high and low temperatures oracidic or caustic environments. These will typically be in the following industries:  

1.  petrochemicals/chemicals

2.  energy

3.  pulp and paper

4.  water treatment and desalination

5.  food processing

6.  pharmaceutical production

7.  oil and gas

8.  conveyance and processing of liquids, gases and semi-solids in solution


Welded tubular products are frequently usedin LNG plants, terminals and tankers; GTL plants, regasification and forstorage. Other oil and gas applications would include in refineries andmethanol, ammonia, ethylene, propylene and urea plants.


ISO 9001:2015 Certified

PED 2014/68/EC  & AD 2000 Certified


Tube manufacturing process, route, starting material, forming operation and weld condition

1 2 3 4 5
Route

Manufacturing process a

Starting material
Forming operation
Weld condition b
01

Automatic arc

welding
Hot or cold rolled strip Continuous forming from strip Aswelded c
02 Welded,outside ground c
Welded,bead worked
03

Hot or coldrolled plate

or sheet
Singleforming from plate or sheet
Aswelded d, e
04
05 Hotor cold rolled strip
Continuousforming from strip
Welded,outside groundc or bead worked

Laser welding

a Tubes withoutside diameter not exceeding 168,3 mm may additionally be brought to therequired tube dimensions by cold workingb (see type of condition WCA and WCR inTable 2).
b The terms "as-welded", "welded, outsideground", "bead worked" and "cold working" apply to thecondition of the tube before heat treatment if required in accordance withTable 2.
c On request, the inside weld can be remelted. Option 3: The inside weld is remelted.
d On request, the inside weld can be worked by rolling orremelting. 
Option 4: The inside weld is worked by rolling or remelting.
e The weld seam can be welded using one or more separatelayers.


Delivery Conditions

Symbol

Type of delivery condition a

Surface condition

W0 b

Welded from hot or cold rolled plate, sheet or strip 1D, 2D, 2E,2B

As welded

W1 b

Welded from hot rolled plate, sheet or strip 1D, descaled

Metallically clean

W1R b

Welded from hot rolled plate, sheet or strip 1D, heat treated, descaled

Metallically clean

W2 b

Welded from hot rolled plate, sheet or strip 1D, bright annealed.

Metallically bright

W2A b

Welded from cold rolled plate, sheet or strip 2D, 2E, 2B,descaled

Metallically clean

W2R b

Welded from cold rolled plate, sheet or strip 2D, 2E, 2B, heattreated, descaled

Except for the weld, essentially
smoother than for types W1 and W1A

W2R b

Welded from cold rolled plate, sheet or strip 2D, 2E, 2B, bright annealed

Metallically bright

WCA

Welded from hot rolled or cold rolled plate, sheet or strip 1D, 2D, 2E, 2B, heat treated if appropriate, at least 20 % cold formed, heat treated, with re-crystallized weld metal, descaled

Metallically clean, weld scarcely
recognizable

WCR

Welded from hot rolled or cold rolled plate, sheet or strip 1D, 2D, 2E, 2B, heat treated if appropriate, at least 20 % cold formed, bright annealed, with re-crystallized weld metal

Metallically bright, weld scarcely recognizable

WG

Ground c

Metallically bright-ground, the
type and degree of grinding
shall be agreed at the time of
enquiry and order d

 WP

Polished c

Metallically bright-polished, the
type and degree of polishing
shall be agreed at the time of
enquiry and order d

a Symbols of flat products according to EN 10088-2.
b For tubes ordered with smoothed welds ("bead worked") letter “b” shall be appended to the symbol of the type of the condition (e. g. W2Ab).
c Conditions W2, W2A, W2R, WCA or WCR are usually used as the starting condition.
d It should be indicated in the enquiry and order whether grinding or polishing is to be performed internally or externally, or internally and externally


Chemical composition (cast analysis)a of austenitic steels, in % by mass (concluded)

Steel grade

C Si Mn P S N Cr Cu Mo Mi Others
Steel name
Steel number
max max max max max






X2CrNi18-9
1.4307/304L 
0.030 1.00 2.00 0.045b 0.015b

≤0.11

17.50-19.50 - - 8.00-10.00 -
X2CrNi19-11
1.4306/304L
0.030

1.00

2.00
0.045b
0.015b
≤0.11
18.00-20.00 - - 10.00-12.00 -
X5CrNi18-10
1.4301/304
0.070 1.00
2.00
0.045b
0.015b
≤0.11
17.00-19.50 - - 8.00-10.50 -
X6CrNiTi18-10
1.4541/321
0.080 1.00
2.00
0.045b
0.015b
- 17.00-19.00 - - 9.00-12.00 Ti 5xC to 0.70
X2CrNiMo17-12-2
1.4404/316L
0.030 1.00
2.00
0.045b
0.015b
≤0.11
16.50-18.50 - 2.00-2.50 10.00-13.00 -
X5CrNiMo17-12-2
1.4401/316
0.070 1.00
2.00
0.045b
0.015b
≤0.11
16.50-18.50 - 2.00-2.50 10.00-13.00 -
X6CrNiMoTi17-12-2
1.4571/316Ti
0.080 1.00
2.00
0.045b
0.015b - 16.50-18.50 - 2.00-2.50 10.50-13.50 Ti 5xC to 0.70
X2CrNiMoN22-5-3
1.4462/Duplex
0.030 1.00
2.00 0.035 0.015 0.10-0.22 21.00-23.00 - 2.50-3.50 4.50-6.50 -
b For tubes welded without filler material the sum of sulphur and phosphorus shall be maximum 0,040 %.


Tolerances on outside diameter and wall thickness

The diameter and the wall thickness of the tubes shall be within the relevant tolerance limits are according to EN ISO 1127

Outside diameter
D
mm

Tolerance on outside diameter                              D
Tolerance on wall thickness                 T
Tolerance
class

Permissible
deviation

Tolerance
class

Permissible
deviation
D ≤ 168,3
 D3 ± 0,75 % or ± 0,3 mm whichever is the greater
T3
± 10 % or ± 0,2 mm whichever is the greater
D4a ± 0,5 % or ± 0,1 mm whichever is the greater
D >168,3
D2 ± 1,0 %
a Option 20: Tolerance class D4 is specified.

Maximum height of the weld seam

Route

Weld condition

Maximum height of the weld seam

T ≤ 8

T > 8

01 and 04

As welded

0,10T+0.5

T/6

02 and 05

Welded, outside ground

for D ≤ 114,3


0,06T+0.3

---

Welded, outside ground

for D ≤ 114,3


0,05T+0,5

T/10

03 and 05

Welded, bead worked

0,15

---


Tolerances on exact lengths

Length L (mm)
Tolerance on exact length (mm)
L ≤ 6 000
+5/0
6000 < L ≤ 12 000
+10/0
L > 12 000
+ by agreement/0

Summary of inspection and testing

The tubes shall inspected and tested according to test category 1 or 2 test category 2 as specified at the time of enquiry and order. Inspection and testing to be carried out are summarised followings.

Type of inspection and test

Frequency of testing

Refer
to

Testing
standard

Test category 1

Test category 2

Mandatory tests

Cast analysis

one per cast

one per cast

11.1


Tensile test at room temperature

one per cast

two per test unit

11.2.1

EN 10002-1

Flattening testa or

one per test unit


11.4.1

EN 10233

Ring tensile testa or

each tube

11.4.1

EN 10237

Drift expanding testa or

11.4.3

EN 10234

Ring expanding testa or

11.4.4

EN 10236

Weld bend test

11.5

EN 910

Leak tightness test

11.8

EN 10246-2

Dimensional inspection

each tube

11.9


Visual examination

11.10


NDT of the weld seam b



a) Eddy current

EN 10246-3

b) Ultrasonic test

EN 10246-7

c) Ultrasonic test

EN 10246-9

d) Radiographic test

EN 10246-10

Material identification

11.12


a Testing method is at the manufacturer’s discretion, in accordance with Table 14.
b Testing method is at the manufacturer’s discretion, but see footnote a toTable 16.





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