What is en 1.4404 square tube ?
Apr 16, 2026
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EN 1.4404 (equivalent to X2CrNiMo17-12-2 and AISI 316L) square tube is a high-quality austenitic stainless steel product. It complies with EN 10217-7 (welded stainless steel tubes for pressure purposes) and EN 10296-2 (welded stainless steel tubes for general purposes) standards, and is widely used in marine engineering, chemical piping, food processing equipment, offshore structures, and architectural decoration.
The EN 1.4404 tubes supplied by GNEE are manufactured through cold drawing, seamless welding, and solution annealing (1050–1100°C followed by rapid cooling), ensuring a uniform structure, smooth surface (Ra ≤ 0.8 μm), and freedom from defects such as cracks or inclusions.
EN 1.4404 stainless steel square tubes offer a tensile strength of 500–700 MPa, yield strength ≥ 220 MPa, elongation ≥ 40%, and Charpy V-notch impact energy ≥ 60 J at -20°C. These properties provide an excellent combination of toughness and durability, making them suitable for long-term service.
In terms of dimensions, GNEE provides both standard and customized specifications: square tube sizes range from 20×20 mm to 200×200 mm, with wall thickness from 1.5 mm to 12 mm. Standard lengths include 6 m, 9 m, and 12 m, with additional services such as precision cutting (tolerance ±0.5 mm) and welding available upon request.
Each batch is supplied with a Mill Test Certificate (MTC), ensuring full traceability and providing reliable material support for high-corrosion and high-demand applications.
EN 1.4404 Square Tube Specification
|
Product Name |
316L Stainless Steel Square Rectangular Tubes |
| Manufacturing Standard | EN 10219-2 (Structural), EN 10217-7 (Pressure), ASTM A554 (Mechanical) |
|
Form |
Welded and Seamless |
|
Width |
Squre:12-150mm |
|
Wall Thickness |
0.03-6mm |
|
Length |
2000mm, 2500mm, 3000mm,6000mm |
|
Surface Treatment |
BA, 2B, NO.1, NO.4, 4K, HL, 8K |
|
Standard |
AISI,ASTM,DIN,JIS,GB,JIS,SUS,EN,etc |
|
Processing Services |
Bending,Welding,Decoiling,Punching,Cutting,Moulding |
|
MOQ |
500kg |
|
Sample And Customize |
Support |
|
Delivery Time |
7-15 days |
|
Shipping Method |
sea freight, land transport, air transport, express delivery |
|
Package |
standard packaging |
en 1.4404 square tube Chemical Composition (EN 10088-3)
| Element | Carbon (C) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Nitrogen (N) | Silicon (Si) |
| Value (%) | ≤ 0.030 | 16.50 – 18.50 | 10.00 – 13.00 | 2.00 – 2.50 | ≤ 0.10 | ≤ 1.00 |
en 1.4404 tube Mechanical Properties (at 20°C)
| Property | Value |
| Yield Strength (Rp0.2) | ≥ 220 MPa |
| Tensile Strength (Rm) | 520 – 670 MPa |
| Elongation (A5) | ≥ 40% |
| Hardness (HBW) | ≤ 215 |
| Modulus of Elasticity | 200 GPa |
EN 10219-2 Dimensional Range & Tolerances
| Parameter | Range | Tolerance |
| Outside Dimensions (B x H) | 10x10 mm to 300x300 mm | ± 1% (Min ± 0.5 mm) |
| Wall Thickness (T) | 1.0 mm to 12.0 mm | ± 10% (T ≤ 5mm) / ± 0.5 mm (T > 5mm) |
| Squareness of Side | 90° | ± 1° |
| Straightness | Max deviation | 0.15% of total length |
| Length | 6000 mm (Standard) | -0 / +50 mm |
What is the primary difference between EN 1.4404 and EN 1.4301 square tubes?
The main difference is the addition of Molybdenum (2.0–2.5%) in 1.4404. This element significantly enhances resistance to pitting and crevice corrosion in chloride-rich environments (e.g., seawater, de-icing salts, and chemical vapors). While 1.4301 is suitable for general use, 1.4404 is the requirement for marine or high-acid industrial applications.
EN 1.4404 stainless hollow section pipe Supplier
Our 1.4404 raw materials are primarily sourced from TISCO, BAOWU, and ZPSS, ensuring extremely stable chemical composition.
Regarding the material authenticity issue, a primary concern for buyers, Gnee offers:
PMI On-site Testing: Before shipment, we use a spectrometer to test the Mo (molybdenum) content on-site to ensure it is ≥ 2.0%, and send a video recording to the customer.
Flaw Detection Testing: We provide 100% eddy current flaw detection reports for pipes used in pressure applications.
Precision Processing:
Laser Cutting: Length tolerances can be controlled within ±0.5mm, resulting in smooth, burr-free cut surfaces.
45-degree Miter Cutting: We directly cut frame joint corners for customers, allowing for immediate welding and assembly upon arrival.
Laser Drilling and Irregular Hole Opening: We can process complex bolt holes, drainage holes, or decorative patterns on square tube walls according to CAD drawings.
Bending and Assembly: We offer large-diameter bending services.
Professional Export Packaging:
We provide thickened woven bags, wooden pallets, or fumigation-free wooden crates for 1.4404 square tubing to prevent seawater corrosion and deformation during sea transport.
Fast Response: In-stock items ship in as little as 7-10 days; customized products are delivered in 15-25 days.
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