304 Stainless Steel Rectangular Tube
Standard：ASTM A554, JIS G3466, EN 10296-2
Dimensions：20mm x 10mm ~ 150mm x 100mm (Custom sizes available)
Wall Thickness：0.7mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm
Length： Standard 6 meters, Custom lengths upon request
Products Description
Stainless steel square tubes and rectangular tubes are hollow, elongated steel sections. Those with square cross-sections are called square tubes, while those with rectangular cross-sections are called 304 Stainless rectangular tubes. They are extensively used as pipelines for transporting fluids such as petroleum, natural gas, water, gas, and steam. Additionally, they offer lighter weight while maintaining comparable bending and torsional strength, making them widely employed in manufacturing mechanical components and engineering structures. With the continuous advancement of modern industry, various metal materials have found broad applications in construction, furniture, automotive, electronics, and other fields.
Product Specifications & Data
| Parameter | Details |
|---|---|
| Material Grade | 304 / 06Cr19Ni10 / UNS S30400 |
| Standard | ASTM A554, JIS G3466, EN 10296-2 |
| Dimensions | 20mm x 10mm ~ 150mm x 100mm (Custom sizes available) |
| Wall Thickness | 0.7mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm |
| Length | Standard 6 meters, Custom lengths upon request |
| Surface Finish | Mill Finish, Brushed (Hairline), Polished (Mirror/Satin), Bead Blasted, PVD Coating (e.g., Titanium Gold) |
| Manufacturing Process | Precision cold-forming, Automatic TIG/Welding, Weld seam smoothing, Bright Annealing |
Chemical Composition
304 stainless steel rectangular tube is an austenitic stainless steel known for its excellent corrosion resistance, weldability, and formability. Its chemical composition complies with ASTM A554, ASTM A312, ASTM A269, or ASTM A276 standards, depending on the product specification.
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 18.00–20.00 |
| Nickel (Ni) | 8.00–10.50 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.93 g/cm³ |
| Melting Range | 1400–1450°C |
| Elastic Modulus | 193 GPa |
| Thermal Conductivity (20°C) | 16.2 W/m·K |
| Electrical Resistivity (20°C) | 0.72 μΩ·m |
| Specific Heat Capacity | 500 J/kg·K |
| Coefficient of Thermal Expansion (20–100°C) | 17.2 × 10⁻⁶/K |
| Magnetic Property | Non-magnetic in the annealed condition (may become slightly magnetic after cold working) |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2%) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 201 HB |
| Rockwell Hardness | ≤ 92 HRB |
Performance Characteristics
Mechanical Properties: Tensile strength ≥520MPa, elongation ≥35%;
Corrosion Resistance: Suitable for acidic/alkaline environments with pH 2-9;
Processing Performance: Right-angle positional error ≤0.3mm, supports laser cutting and bending forming, surface free of pinholes or scratches.
Application Fields
Construction Sector: Steel structure support frames, curtain wall keels;
Chemical Equipment: Reactor piping, oil/gas transmission lines;
Precision Manufacturing: Aerospace instrument brackets, tubing for hardware products.
Classification
304 Stainless rectangular tubes are categorized into seamless steel pipes and welded steel pipes (seam pipes). By cross-sectional shape, they are further divided into square and rectangular tubes. While circular steel pipes are most widely used, other profiles include semi-circular, hexagonal, equilateral triangular, octagonal, and other special shapes. All stainless steel square tubes subjected to fluid pressure undergo hydraulic testing to verify pressure resistance and quality. Qualification requires no leakage, wetting, or expansion under specified pressure. Some tubes additionally undergo edge-bending tests, flaring tests, or flattening tests per standards or customer requirements.
Production Process for Square and 304 Stainless rectangular tubes:
Round bar preparation → Heating → Hot-rolled piercing → Cutting heads → Acid washing → Grinding → Lubrication → Cold rolling → Degreasing → Solution heat treatment → Straightening → Cutting → Acid washing → Final inspection.
Frequently Asked Questions (FAQ)
1. What is a 304 stainless steel rectangular tube?
A 304 stainless steel rectangular tube is a hollow structural section made from Type 304 austenitic stainless steel. It offers excellent corrosion resistance, high strength, and an attractive appearance, making it suitable for structural, architectural, industrial, and decorative applications.
2. What are the advantages of 304 stainless steel rectangular tubes?
Key advantages include:
Excellent corrosion resistance
High strength and durability
Good weldability
Excellent formability
Smooth and attractive surface finish
Easy fabrication and machining
Low maintenance
Long service life
Good hygienic properties for food and pharmaceutical applications
3. What is the difference between 304 and 304L stainless steel rectangular tubes?
The main difference is carbon content:
304: Carbon ≤ 0.08%
304L: Carbon ≤ 0.03%
304L provides improved weldability and better resistance to intergranular corrosion after welding, making it the preferred choice for welded structures.
4. Is 304 stainless steel suitable for outdoor use?
Yes. 304 stainless steel performs well in most outdoor environments due to its excellent resistance to atmospheric corrosion. However, in coastal or high-chloride environments, 316 or 316L stainless steel is generally recommended for enhanced corrosion resistance.
5. Can 304 stainless steel rectangular tubes be welded?
Yes. 304 stainless steel has excellent weldability and can be welded using TIG, MIG, resistance, and laser welding processes. Post-weld heat treatment is generally not required for most applications.
6. What surface finishes are available?
Common surface finishes include:
Mill Finish
No.4 Brushed Finish
Hairline Finish
BA (Bright Annealed)
Mirror Finish (No.8)
Pickled Finish
Polished Finish
7. What sizes do you supply?
We offer a wide range of standard and custom sizes.
Typical specifications include:
Width: 10–300 mm
Height: 10–300 mm
Wall Thickness: 0.5–12 mm
Length: 3 m, 6 m, or customized
Custom dimensions and cut-to-length services are available.
8. What industries use 304 stainless steel rectangular tubes?
304 rectangular tubes are widely used in:
Building and construction
Architectural decoration
Furniture manufacturing
Food processing equipment
Pharmaceutical equipment
Chemical processing
Automotive components
Machinery manufacturing
Handrails and railings
Interior and exterior structures
9. Do you provide Mill Test Certificates (MTC)?
Yes. We can provide EN 10204 3.1 Mill Test Certificates with each shipment. Third-party inspections by SGS, BV, TÜV, or other internationally recognized inspection agencies are also available upon request.
10. Why choose your 304 stainless steel rectangular tubes?
Premium-quality raw materials
Manufactured to ASTM, EN, JIS, and GB standards
Strict quality control and comprehensive inspection
Wide range of sizes and surface finishes
Custom fabrication and OEM services
Large inventory for fast delivery
Competitive factory-direct pricing
Professional export packaging
Over 18 years of manufacturing and export experience
Global shipping with reliable technical and after-sales support
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