DIN 1.4404 Stainless Steel Thin Wall Pipe
Standard: EN 10217-7 (Welded) / EN 10216-5 (Seamless)
Material Number: 1.4404
EN Steel Grade: X2CrNiMo17-12-2
Equivalent Grades: AISI 316L / UNS S31603
Microstructure: Austenitic stainless steel
Outside Diameter (OD): 6.0 mm – 219.1 mm
Wall Thickness (WT): 0.5 / 0.7 / 1.0 / 1.2 / 1.5 / 2.0 mm
OD Tolerance: Class D3: ±0.75% or min. ±0.3 mm (per EN ISO 1127)
WT Tolerance: Class T3: ±10% or min. ±0.2 mm (per EN ISO 1127)
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Description
Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of din 1.4404 stainless steel thin wall pipe in China. With abundant experience, we warmly welcome you to wholesale customized din 1.4404 stainless steel thin wall pipe from our factory. For price consultation, contact us.
If you are looking for a thin-walled, corrosion-resistant, and easily weldable industrial stainless steel pipe, 1.4404 Stainless Steel Pipe is a widely used austenitic stainless steel material in chemical processing, food processing, pharmaceuticals, seawater applications, and general pressure piping.
1.4404 stainless steel pipe features a low carbon content of ≤ 0.030% and contains approximately 16.5–18.5% Cr, 10–13% Ni, and 2.0–2.5% Mo. Compared to 1.4301 stainless steel, it provides superior resistance to pitting and crevice corrosion in environments containing chlorides, salt spray, and various aggressive chemicals. With a tensile strength of approximately 520–670 MPa, yield strength of ≥ 220 MPa, and elongation of ≥ 45%, 1.4404 piping delivers excellent mechanical strength and corrosion performance under proper design conditions, even when utilizing thinner wall profiles.
GNEE supplies 1.4404 Thin Wall Stainless Steel Pipe in both seamless and welded configurations. For pressure-retaining applications, EN 10216-5 specifies the technical delivery conditions for seamless stainless steel tubes used in pressure and corrosion-resistant service, incorporating TC1/TC2 test categories, while welded pipes can be supplied according to EN 10217-7. Standard outer diameters range from approximately 6.0 to 219.1 mm, with wall thicknesses starting from as low as 0.5 mm, supporting cut-to-length, custom cutting, and dimensional tolerances specified by technical drawings. Seamless pipe manufacturing integrates billet inspection, piercing, hot rolling or cold drawing, solution annealing, pickling/passivation, straightening, cut-to-length, and final inspection. For 1.4404 welded thin-wall pipes, quality is strictly controlled through precision forming, longitudinal welding, weld bead finishing, heat treatment, and eddy current or hydrostatic non-destructive testing.
EN 10217-7 / EN 10216-5 1.4404 Stainless Steel Pipe Specifications
| Item | Specification |
|---|---|
| Standard | EN 10217-7 (Welded) / EN 10216-5 (Seamless) |
| Material Number | 1.4404 |
| EN Steel Name | X2CrNiMo17-12-2 |
| Equivalent Grade | AISI 316L / UNS S31603 |
| Structure | Austenitic Stainless Steel |
| Outside Diameter (OD) | 6.0 mm – 219.1 mm |
| Wall Thickness (WT) | 0.5 / 0.7 / 1.0 / 1.2 / 1.5 / 2.0 mm |
| OD Tolerance | Class D3: ±0.75% or min. ±0.3 mm, per EN ISO 1127 |
| WT Tolerance | Class T3: ±10% or min. ±0.2 mm, per EN ISO 1127 |
| Standard Length | 6000 mm |
| Custom Length | Available upon request |
Chemical Composition (Mass Weight %)
| Element | Min (%) | Max (%) |
| Carbon | --- | 0.030 |
| Silicon | --- | 1.00 |
| Manganese | --- | 2.00 |
| Phosphorus | --- | 0.045 |
| Sulfur | --- | 0.015 |
| Chromium | 16.50 | 18.50 |
| Nickel | 10.00 | 13.00 |
| Molybdenum | 2.00 | 2.50 |
| Nitrogen | --- | 0.11 |
Mechanical Properties (at Room Temperature 20°C)
Condition: Solution Annealed (+AT)
| Property | Value (Metric) |
| Tensile Strength (Rm) | 500 – 700 MPa |
| Yield Strength (Rp0.2) | ≥ 200 MPa |
| Yield Strength (Rp1.0) | ≥ 235 MPa |
| Elongation (A5) | ≥ 40 % |
| Hardness (Brinell) | ≤ 215 HBW |
1.4404 Stainless steel Tube Applications
Potable Water Systems: EN 10312 certified pipes for drinking water.
Food & Beverage: Dairy, brewery, and juice production lines.
Pharmaceutical: Cleanroom piping and process fluid transport.
Exhaust Systems: Performance automotive and marine exhaust components.
Heat Exchangers: High-efficiency cooling or heating systems.
If needed, please provide me with the following information:
The required outer diameter and wall thickness, the application or fluid type (e.g., potable water, chemicals), and whether you prefer welded or seamless pipe.
I can assist you in determining the appropriate standards or procurement specifications for the project.
Testing and Quality Assurance
Chemical composition analysis: Verification of alloy composition.
Eddy current testing: 100% non-destructive testing to ensure the integrity of welds/tubing.
Flaring/flanging test: Ensures thin-walled tubing can withstand mechanical deformation.
Intergranular corrosion test: Conducted in accordance with EN ISO 3651-2 standards.
Roughness measurement (Ra): For food/pharmaceutical grade piping (typically Ra < 0.8 μm).
Stainless Steel DIN 1.4404 Round Pipe Packaging
With over 18 years of experience in stainless steel exports, GNEE serves clients in more than 60 countries, catering to both standard procurement needs and customized industrial projects. We employ protective measures-such as plastic end caps, waterproof packaging, and reinforcement with wooden crates or steel strapping-to effectively prevent scratches, moisture damage, and contamination during international transit.
FAQ
Q: Why choose "thin-walled" piping instead of standard thick-walled piping?
A: Cost-effectiveness: Since the 1.4404 grade contains expensive nickel and molybdenum, reducing wall thickness significantly lowers material costs.
Weight reduction: Reduces the overall weight of the piping system without compromising pressure rating requirements (typically used in systems rated below 16 bar).
Flow optimization: For the same outer diameter, thin-walled piping has a larger inner diameter, thereby reducing fluid resistance.
Q: What is the difference between 1.4404 and 1.4401?
A: This is a common question during the procurement process:
1.4401 (AISI 316): Higher carbon content. After welding, the weld zone is prone to "carbide precipitation," which can lead to intergranular corrosion.
1.4404 (AISI 316L): Lower carbon content (≤0.03%). It does not require post-weld annealing and offers more stable corrosion resistance. 1.4404 is the preferred industry standard material for thin-walled piping.
Q: What surface finishes are available for 1.4404 thin-walled piping?
A: Pickled: Industry standard; a matte finish obtained after removing the weld oxide layer.
Bright Annealed (BA): A mirror-like, bright finish.
Polished/Grit: Mechanically polished outer surface; commonly used in food processing and architectural decoration (e.g., 240-grit or 320-grit polish).
Q: Is it suitable for hygienic applications?
A: Absolutely.
1.4404 is the standard material for the European pharmaceutical and food industries. In these sectors, the roughness of the inner surface (Ra < 0.8 μm) is a key consideration.
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