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DIN EN 10312 Welded Tubes

Welded stainless steel tubes for the conveyance of aqueous liquids including water for human consumption 

Technical delivery conditions 








Table 1 Dimensions of light gauge stainless steel tubes—— Series 1 

Specified Outside Diameter  

 D

Outside Diameter 

Specified Wall Thickness

  T

Maximum

Minimum

6

6.04

5.94

0.6

8

8.04

7.94

0.6

10

10.04

9.94

0.6

12

12.04

11.94

0.6

15

15.04

14.94

0.6

18

18.04

17.94

0.7

22

22.05

21.95

0.7

28

28.05

27.95

0.8

35

35.07

34.97

1.0

42

42.07

41.97

1.1

54

54.07

53.84

1.2

66.7

66.75

66.08

1.2

76.1

76.3

75.54

1.5

(103)

103.8

102.2

1.5

108

108.3

107.2

1.5

(128)

129.0

127.0

1.5

133

133.5

132.2

1.5

(153)

154.5

151.5

1.5

159

159.5

157.9

2.0

NOTE   NON-PREFERRED SIZES OF TUBES ARE SHOWN IN PARENTHESES.

Tolerance on wall thickness shall be: 

Height of the weld seam:  The external weld seam shall be removed. The internal weld seam need not be removed unless option 5 is specified. 


Table 2—— Dimension of light guage stainless steel tubes—— Series 2 

Specified Outside Diameter

  D

Tolerance 

D

Specified Wall Thickness 

T

Tolerance on 

T

12.0 ±0.10 1.0

±0.10

15.0

±0.10

1.0 ±0.10
18.0 ±0.10 1.0 ±0.10
22.0 ±0.11 1.2 ±0.10
28.0 ±0.14 1.2 ±0.10
35.0 ±0.18 1.5 ±0.10
42.0 ±0.21 1.5 ±0.10
54.0 ±0.27 1.5 ±0.10
64.0 ±0.32 2.0 ±0.15
76.1 ±0.38 2.0 ±0.15
88.9 ±0.44 2.0 ±0.15
108.0 ±0.54 2.0 ±0.15
133.0 ±1.00 3.0 ±0.30
159.0 ±1.00 3.0 ±0.30
219.0 ±1.50 3.0 ±0.30
267.0 ±1.50 3.0 ±0.30

 ——±10% for series 1 tubes 

 —— as given in Table 2 for series 2 tubes. 

Option 5: The internal weld seam shall be removed. 

Inspection and testing shall be carried out in accordance with Table 3. 


Table 3—— Summary of inspection and testing 

Test /Inspection  Frequency of testing  Clause reference 
Non-specific inspection / test Specific inspection / test
Mandatory 
Cast Analisis  Steel manufacturers cast analysis  Steel manufacturers cast analysis
8.2
Hardness test a By agreement 
7.2
Tensile test b Manufacturer's procedure  1/ test unit  11.1
Drift expanding test for D<=150mm  Manufacturer's procedure 
1/ test unit 

11.2

Flattening Test  Manufacturer's procedure 
1/ test unit 
11.3
Leak tightness test Individual  Individual 
11.4
Weld NDT Individual 
Individual 
11.5
Visual examination See 11.6
Dimensional inspection See 11.7
Optional 
Material identification  Individual  Individual 
11.9
Intergranular corrossion Not applicable  By agreement 

a Only for Ferritic steel tubes applied when option 1 is specified. 

b Only for tubes supplier in accordance with Table 2. 


Packing: 

Carbon steel strapping shall not come into contact with the tubes. Tube ends need not be protected unless option 9 is specified for tubes to be used for water for human consumption. 

Option 9: Tubes or bundles of tubes shall be supplier with protection at the ends. 


Annex A 

Table A.1 lists preferred grades of steels, which can be used. The steels conform to EN 10088-2. 

Table A.1—— Steel Grades 

Type of steel  Steel Grade 

Steel Name  Steel Number 
Ferritic 
X3CrTi17 1.4510
X3CrNb17 1.4511
X2CrMoTi18-2 1.4521
Austenitic 
X2CrNi18-9 1.4307
X2CrNi19-11 1.4306
X5CrNi18-10 1.4301
X6CrNiTi18-10 1.4541
X2CrNiMo17-12-2 1.4404
X5CrNiMo17-12-2 1.4401
X6CrNiMoTi17-12-2 1.4571
X2CrNiMo17-12-3 1.4432
X3CrNiMo17-13-3 1.4436

X2CrNiMoN17-13-5

1.4439
X1NiCrMoCu25-20-3 1.4539
X1CrNiMoCuN20-18-7 1.4547
X1NiCrMoCuN20-20-7 1.4529
Austentic-Ferritic 
X2CrNiN23-4 1.4362 a
X2CrNiMoN22-5-3 1.4462
a Patented grade. 

Annex B 

Table B.1 Recommended use of tubes with fittings 

Fitting Series 1 Series 2
Capillary Yes a No
Compression  Yes b Yes 
Press  Yes b Yes 
Note  Diamters and wall thickness should be in according with Tables 1 and 2. 

a Tubes for use with capillary fittings supplied with outside diameter D in according with series 1 may have their wall thickness in according with series 2. 

b Care needs to be taken to avoid damaging the tubes. 


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