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EN 10312

EN 10312

EN 10312 is an European Standard specifies the technical delivery conditions for light gauge welded stainless steel tubes from austenitic, austenitic-ferritic, and duplex stainless steels, primarily for water application, including water intended for human consumption, supplied in straight lengths and suitable for used with related fittings. The standard is applicable to the size range from 6mm to 267mm outside diameter made of stainless steel grades taken from EN 10088-2. It establishes clear guidelines for manufacturers on the dimensions, material properties, and testing procedures that must be met to ensure that the tubes will perform as intended and resist corrosion over their lifetime.

Available Grades and Chemical Requirements

Available Grades and Chemical Requirements

Steel grade

C

Si

Mn

P

S

N

Cr

Cu

Mo

Ni

Others

Steel name

Steel number

max

max

max

max

max

X5CrNi18-10

1.4301/304

0.07

1.00

2.00

0.045ᵇ

0.015ᵇ

≤0.11

17.0-19.5

-

-

8.0-10.5

-

X2CrNi18-9

1.4307/304L

0.03

1.00


2.00

0.045ᵇ

0.015ᵇ

≤0.11

17.5-19.5

-

-

8.0-10.0

-

X2CrNi19-11

1.4306/304L

0.03

1.00

2.00

0.045ᵇ

0.015ᵇ

≤0.11

18.0-20.0

-

-

10.0-12.0

-

X2CrNiMo17-12-2

1.4404/316L

0.03

1.00

2.00

0.045ᵇ

0.015ᵇ

≤0.11

16.5-18.5

-

2.00-2.50

10.0-13.0

-

X6CrNiTi18-10

1.4541/321

0.08

1.00

2.00

0.045ᵇ

0.015ᵇ

-

17.0-19.0

-

-

9.0-12.0

Ti 5xC to 0.70

X2CrNiMoN22-5-3

1.4462/Duplex 2205

0.03

1.00

2.00

0.035

0.015

0.10-0.22

21.0-23.0

-

2.50-3.50

4.5-6.5

-

X2CrNiMoN25-7-4

1.4410/Duplex 2507

0.03

1.00

2.00

0.035

0.015

0.2-0.35

24.0-26.0

3.0-4.5

6.0-8.0

ᵇ For tubes welded without filler material the sum of sulphur and phosphorus shall be maximum 0.040 %.

Dimensions of light gauge stainless steel tubes - Series 1

Dimensions of light gauge stainless steel tubes - Series 1

Dimensions in millimetres
Specified outside diameter D
Outside diameter
Specified wall thickness T
maximum
minimum
15
15.04
14.94
0.60
18
18.04
17.94
0.70
22
22.05
21.95
0.70
28
28.05
27.95
0.80
35
35.07
34.97
1.00
42
42.07
41.97
1.10
54
54.07
53.84
1.20
76,1
76.3
75.54
1.50
108
108.3
107.2
1.50
133
133.5
132.2
1.50
159
159.5
157.9
2.00
The tolerance on wall thickness shall be +/-10% for series 1 tubes.

Dimensions of light gauge stainless steel tubes - Series 2

Dimensions of light gauge stainless steel tubes - Series 2

Dimensions in millimetres
Specified outside diameter D
Tolerance on D
Specified wall thickness T
Tolerance on T
15.0
±0.10
1.00
±0.10
18.0
±0.10
1.00
±0.10
22.0
±0.11
1.20
±0.10
28.0
±0.14
1.20
±0.10
35.0
±0.18
1.50
±0.10
42.0
±0.21
1.50
±0.10
54.0
±0.27
1.50
±0.10
76.1
±0.38
2.00
±0.15
88.9
±0.44
2.00
±0.15
108.0
±0.54
2.00
±0.15
133.0
±1.00
3.00
±0.30
159.0
±1.00
3.00
±0.30
219.0
±1.50
3.00
±0.30

Summary of inspection and testing

Summary of inspection and testing

Test/lnspection
Frequency of testing
Non-specific inspection and testing
Specific inspection and testing
Mandatory
Cast analysis
Steel manufacturers cast analysis
Steel manufacturers cast analysis
Hardness test ᵃ
By agreement
Tensile test ᵇ
Manufacturer's procedure
1/test unit
Drift expanding test for D ≤150 mm
Manufacturer's procedure
1/test unit
Flattening test
Manufacturer's procedure
1/test unit
Leak tightness test
Individual
Individual
Weld NDT
Individual
Individual
Visual examination
The tubes shall be smooth and have a bright surface, free from all external and internal surface defects.
Dimensional inspection
The specified dimensions shall be verified.
Optional
Material identification
Individual
Individual
Intergranular corrosion test
Not applicable
By agreement
ᵃ Only for ferritic steel tubes supplied annealed when option 1 is specified.
ᵇ Only for tubes supplied in accordance with Table 2.

Relationship Product

Typical Chemical Composition %

Typical Mechanical Properties

ASTM A554 Wall Thickness/Outside Dimention Tolerances

Wall Thickness Tolerances
± 10% of specified wall thickness

APPLICATIONS

WATER CONVEYANCE FOR HUMAN CONSUMPTION
WATER CONVEYANCE FOR HUMAN CONSUMPTION
EN 10312 is a standard that specifies the technical delivery conditions for welded stainless steel tubes used for the conveyance of aqueous liquids including water for human consumption. The applications of EN 10312 stainless steel tubes in water conveyance for human consumption include: Drinking Water Distribution: They are used in municipal and residential water distribution systems due to their resistance to corrosion and leaching, ensuring the water does not get contaminated with harmful substances. Water Treatment Plants: Stainless steel tubes are used in various stages of water treatment, including filtration, disinfection, and reverse osmosis systems, providing durability and maintaining water quality. Building Water Systems: They are implemented within buildings for plumbing systems to supply potable water, offering a hygienic and long-lasting solution. Storage Tanks and Reservoirs: Pipes connect storage facilities to distribution networks, keeping water safe during storage and transportation. Cooling Systems: EN 10312 tubes are also suitable for use in cooling systems where water is used as a coolant, especially in potable water cooling applications. The key benefits of using EN 10312 stainless steel tubes for water conveyance include their excellent resistance to a wide range of water types, durability over a long service life, and minimal maintenance requirements, making them a sustainable choice for potable water infrastructure.
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