EN 10312 Welded Stainless Steel Water Tube

BS EN 10312 welded stainless steel tube is produced for the conveyance of water and other aqueous liquids, primarily for water applications, EN 10312 is a European Standard covering welded stainless steel tubes with tight tolerances, including series 1 and series 2, the welded tubes can be finished in as welded, bright annealed and polished conditions.

Stainless steel tubes are more and more used for drinking water because of their excellent corrosion resistance and durable features. Stainless steel water pipes provide health and hygiene, safety and reliability, durability, energy saving, environmental protection and other advantages. Our EN 10312 welded water pipes are mainly delivered to Singapore, Malaysia, Indonesia, South Africa, Germany and European markets.

EN 10312 Welded Stainless Steel Water Tube Specifications

Standard	EN 10312
Welding Type	TIG Welding
Grades	1.4301, 1.4307, 1.4404, 1.4571, 1.4432 Etc.
Finishing	As Welded, Annealed, Polishing
Outside Diameter	6 – 267 Mm
Thickness	0.6 – 3 Mm

EN 10312 welded stainless steel tube shall be manufactured from stainless steel strip, we use automatic TIG welding type forming longitudinally welded, as-welded condition, solution annealed can be offed for option.

Polishing inside and outside for sanitary applications is frequently used in conveying drinking water.

EN10312 Welded Tube Dimensions And Tolerances

Series 1

Outside Diameter, mm	Outside Diameter Tolerance, mm		Wall Thickness, mm
	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	76,30	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
The Tolerance On Wall Thickness Shall Be +/– 10 %

Series 2

Outside Diameter, mm	Tolerance, mm	Wall Thickness, mm	Tolerance,
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

The above table specifies tube outside diameters and related wall thicknesses, tube standard lengths should be 5 m or 6 m, tolerances are also given, roundness is included in the tolerance of outside diameter, and the tolerance on standard lengths is ± 20 mm.

Regarding the weld seam, the external weld seam shall be removed, the internal weld seam cannot be removed, also removed upon agreement.

Inspection And Testing

Tubes shall be smooth and have a bright surface, free from all external and internal surface defects by visual examination.

• Dimensional inspection, the tube diameter, and wall thickness shall be measured.
• Intergranular corrosion test shall be carried out in accordance with EN ISO 3651-1 or EN ISO 3651-2.
• PMI testing should be conducted to ensure grade conforming EN 10088 – 2.
• Tensile test shall be carried out in accordance with EN 10002-1, 
• Drift expanding test with EN 10234.
• Flattening test EN 10233.
• Eddy current test shall be carried out for EN 10246-2 for Austenitic steels and ferritic-austenitic steels.
• Hydrostatic test shall be carried out at a minimum gauge pressure of 50 bar.
• Pneumatic test should be conducted at a minimum pressure of 6 bar.

Stainless Steel Water Tube Advantages

Healthful

Tube has a smooth inner surface, is not fouled for a long time use, is not easy to be stained with bacteria, no worry about water quality affected.

Stainless steel is a 100% renewable material that does not cause harm to the environment.

Various Grades Selected

There are kinds of materials to meet the different conditions, like 304, 304L, and 316L, which have high strength.

Durable And Cost Saving

The thin and dense chromium-rich oxide film on the surface of stainless steel makes water tube have good corrosion resistance in all water fluid including soft water, the corrosion test data shows that the stainless steel tube can be used for up to 100 years, with almost no maintenance is required during the life cycle, the cost and trouble of the tube replacement are avoided, and the comprehensive use cost is lower.

High Temperature And Pressure Resistance

Whether it is high or low temperature, no harmful substances will be precipitated, and the material properties are quite stable; the high strength of stainless steel water pipes greatly reduces the possibility of leakage due to external forces and significantly reduces the water leakage rate.