DIN 11850 Hygienic Food Grade Polished Tube
Standard:DIN 11850
Product Type:Stainless Steel Sanitary Pipe / Hygienic Tube
Material Numbers:1.4301, 1.4307, 1.4404
Manufacturing Method:Welded / Cold Rolled / Cold Drawn
Surface Finish:2B, BA, Pickled, Polished
Internal Surface:Smooth / Polished
Typical Surface Roughness:Ra ≤ 0.8 μm; Ra ≤ 0.4 μm
End TypeL:Plain End, Cut-to-Length
Connection:Tri-Clamp, DIN 11851, DIN 11864 and other sanitary fittings
Inspection:Dimensional Inspection, Visual Inspection, Surface Roughness Testing, PMI, Hydrostatic/Leak Testing as specified
Documentation:MTC / EN 10204 3.1 available
Send E-mail:info@gneestainless.com
Tel:+8615824687445
Description
Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of DIN 11850 Hygienic Food Grade Polished Tube in China. With abundant experience, we warmly welcome you to wholesale customized DIN 11850 Hygienic Food Grade Polished Tube from our factory. For price consultation, contact us.
What are DIN 11850 stainless steel pipes?
DIN 11850 stainless steel pipes are specialized hygienic tubes defined by a German industrial standard. They are built for fluid systems in the food, dairy, beverage, and pharmaceutical sectors, where cleanliness, smooth surfaces, and safety are critical.
If you are looking for German-standard high-purity piping specifically designed for the food processing, dairy, beverage, and biopharmaceutical industries, DIN 11850 stainless steel hygienic food-grade polished tubing (now integrated into the EN 10357 standard) is the industrial benchmark for meeting strict hygiene safety regulations and automated CIP/SIP (Clean-In-Place / Sterilize-In-Place) system requirements.
The core advantage of our DIN 11850 stainless steel tubing lies in strict surface roughness control and high dimensional precision. Utilizing high-precision automatic TIG or laser welding combined with internal weld seam bead flattening and mechanical or electropolishing, the internal surface roughness can be controlled to Ra ≤ 0.8 μm or even Ra ≤ 0.4 μm. This guarantees zero leakage risk while withstanding system operating pressures of up to 10–16 bar and high-temperature steam sterilization exceeding 140°C.
GNEE can supply the full range of DIN 11850 Range 1, Range 2, and Range 3 hygienic polished tubes, covering outer diameters from DN10 to DN200 (12 mm to 204 mm) and wall thicknesses from 1.0 mm to 2.5 mm, with custom cut lengths up to 6 meters. We support custom mechanical polishing (MP) and electropolishing (EP). Delivered tubes come with EN 10204 3.1 fully traceable mill test certificates, and every batch passes 100% eddy current testing (ET), pneumatic testing, and endoscopic surface inspection to provide global food and biopharmaceutical projects with high-efficiency, dead-leg-free, and fully traceable sanitary piping solutions.
DIN 11850 Stainless Steel Pipes specification
| Material | Stainless Steel 304/304L/316/316L |
| Shape | Round / Square / Rectangle |
| Production Standards | ASTM A270 , AS 1528.1 , EN 10357 , DIN 11850 ,ISO 2037 , JIS G3447, KS D3585 and so on. |
| Outer Diameter | 16mm - 2000mm |
| Thickness | 0.8mm - 20 mm |
| Length | 6 Meters - 18.3 Meters ; As customers' request ; |
| Tolerance | According to the Standard , +/-10% Commonly ; |
| Surface Treatment | 180#, 320#, 400# Satin / Hairline, Bright Anneal, Pickle,400#, 500#, 600# or 800# Mirror finish |
| Application | Suitable For Industries With High Hygiene Requirements Such As Beer, Beverage, Milk, Pharmaceuticals, Etc. |
| Test | Flaring test ; Flattening test ; Bending Test ; Hydraulic Test ; Eddy Current test |
Chemical Composition Requirements (%)
Values represent the maximum percentage unless a range is provided. In accordance with EN 10088-2 and EN 10217-7.
| Material Number | AISI Grade | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Nitrogen (N) |
| 1.4301 | 304 | 0.07 | 1.00 | 2.00 | 0.045 | 0.015 | 17.50 – 19.50 | 8.00 – 10.50 | - | 0.10 |
| 1.4307 | 304L | 0.03 | 1.00 | 2.00 | 0.045 | 0.015 | 17.50 – 19.50 | 8.00 – 10.70 | - | 0.10 |
| 1.4401 | 316 | 0.07 | 1.00 | 2.00 | 0.045 | 0.015 | 16.50 – 18.50 | 10.00 – 13.00 | 2.00 – 2.50 | 0.10 |
| 1.4404 | 316L | 0.03 | 1.00 | 2.00 | 0.045 | 0.015 | 16.50 – 18.50 | 10.00 – 13.00 | 2.00 – 2.50 | 0.10 |
| 1.4435 | 316L (High Ni) | 0.03 | 1.00 | 2.00 | 0.045 | 0.015 | 17.00 – 19.00 | 12.50 – 15.00 | 2.50 – 3.00 | 0.10 |
Dimensional Tables (Series 1 & Series 2)
DIN 11850 pipes are classified into "Ranges" or "Series." Series 2 is the most common in modern food processing plants.
| Nominal Diameter (DN) | Series 1 (OD x WT) [mm] | Series 2 (OD x WT) [mm] | Tolerance (OD) [mm] | Tolerance (WT) [mm] |
| DN10 | 12 x 1.0 | 13 x 1.5 | ± 0.10 | ± 0.10 |
| DN15 | 18 x 1.0 | 19 x 1.5 | ± 0.10 | ± 0.10 |
| DN20 | 22 x 1.0 | 23 x 1.5 | ± 0.10 | ± 0.10 |
| DN25 | 28 x 1.0 | 29 x 1.5 | ± 0.10 | ± 0.10 |
| DN32 | 34 x 1.0 | 35 x 1.5 | ± 0.15 | ± 0.10 |
| DN40 | 40 x 1.0 | 41 x 1.5 | ± 0.15 | ± 0.10 |
| DN50 | 52 x 1.0 | 53 x 1.5 | ± 0.20 | ± 0.10 |
| DN65 | 70 x 2.0 | 70 x 2.0 | ± 0.30 | ± 0.15 |
| DN80 | 85 x 2.0 | 85 x 2.0 | ± 0.40 | ± 0.15 |
| DN100 | 104 x 2.0 | 104 x 2.0 | ± 0.50 | ± 0.15 |
| DN125 | 129 x 2.0 | 129 x 2.0 | ± 0.60 | ± 0.15 |
| DN150 | 154 x 2.0 | 154 x 2.0 | ± 0.70 | ± 0.15 |
Surface Roughness Requirements
Surface finish is critical to ensure cleanability (CIP - Cleaning in Place).
| Finish Code | Internal Roughness (Ra) | Weld Seam Roughness (Ra) | External Surface Finish |
| H3 | ≤ 0.80 μm | ≤ 0.80 μm | Ground/Polished (Ra ≤ 1.0 μm) |
| H4 | ≤ 0.40 μm | ≤ 0.40 μm | Ground/Polished (Ra ≤ 1.0 μm) |
| HE3 | ≤ 0.80 μm | ≤ 0.80 μm | Electro-Polished |
| HE4 | ≤ 0.40 μm | ≤ 0.40 μm | Electro-Polished |
DIN 11850 Stainless Steel Pipes applications:
Processing of milk, cheese, and dairy products;
Conveying of beer, wine, and soft drinks;
Handling of liquid foods and safe cleaning fluids.
| Grade | Application Suitability | Why it is used? |
| 1.4301 / 304 | Dairy, Wine, Soft Drinks | Standard resistance to organic acids and cleaning agents. |
| 1.4307 / 304L | Heavy Welding Applications | Prevents sensitization during welding in thicker-walled tubes. |
| 1.4404 / 316L | Pharmaceuticals, Biotech, Saline | Added Molybdenum provides high resistance to chlorides (pitting). |
| 1.4435 / 316L+ | Specialized Pharma (ASME BPE) | High Nickel content ensures a more stable austenitic structure and lower ferrite levels. |
For further assistance, please specify:
Do you require specific dimensions (outer diameter and wall thickness)?
Do you need 304 or 316L stainless steel?
What is the required Ra surface roughness value?
DIN11850 sanitary Stainless Steel pipe testing
GNEE subjects DIN 11850 sanitary/food-grade polished tubes to rigorous inspection, including 100% visual inspection, measurement of outer diameter and wall thickness, PMI (material composition analysis), weld seam inspection, and-upon customer request-eddy current testing or hydrostatic testing.
Standard packaging
To prevent secondary contamination and scratching during transport:
Polished tubes are typically individually sleeved in plastic bags.
Plastic end caps are usually fitted to the tube ends to prevent the ingress of dust and foreign matter.
Wooden crates are generally used for the outer packaging.
Hot Tags: DIN 11850 Hygienic Food Grade Polished Tube, China DIN 11850 Hygienic Food Grade Polished Tube manufacturers, factory, ss 316L Welded pipe, Stainless Steel Welded Pipe, 316L Stainless Steel Welded Pipe, 304 Stainless Steel Welded Pipe, ss 304 welded pipe, ASTM A269 Welded Austenitic Stainless Steel Tubing
Send Inquiry
You Might Also Like
