Seamless Stainless Steel TP304 Tube
As a dedicated stainless steel seamless tube manufacturer based in Wenzhou’s industrial hub, GZH specializes in high-precision Cold Drawn (CD) and Cold Rolled production processes. Our facility integrates advanced heat treatment and precision finishing to ensure every tube features a homogeneous metallurgical structure and exceptional dimensional stability.
Compared to welded alternatives, our seamless TP304 tubes offer enhanced structural integrity, making them the preferred choice for high-pressure systems and critical fluid transport.
ASTM A213/A269, EN10216-5 Stainless Steel 304 Seamless Tubing - High-Precision Solutions
Introduction to Seamless Stainless Steel TP304 Tube
ASeamless Stainless Steel TP304 Tube is a high-performance, pressure-rated cylindrical component produced through an extrusion and cold-finishing process. Unlike welded alternatives, these tubes are engineered from a solid stainless steel billet, ensuring a seamless, continuous metal structure that eliminates the risk of longitudinal failure.
As the industry-standard"18/8"austenitic grade, Type 304 is the most versatile alloy for tubing. It offers a strategic balance of high ductility, excellent oxidation resistance, and long-term cost-efficiency in diverse industrial environments.
Key Technical Advantages
While standard piping focuses on fluid volume, TP304seamless tubing is defined by its rigorous dimensional control and structural integrity:
- Tight Dimensional Tolerances: Through precision cold-drawing (CD)orcold-rolling, these tubes achieve superior accuracy in Outside Diameter (OD) and Wall Thickness (WT), essential for high-tolerance fittings.
- Enhanced Surface Integrity: The manufacturing process results in a superior surface finish (often reaching Ra ≤ 0.8μm or better), minimizing turbulence in fluid flow and preventing bio-fouling in sensitive applications.
- Superior Pressure Rating: The absence of a weld seam allows for higher working pressures and safety factors, making them indispensable for critical hydraulic and instrumentation systems.
- Excellent Formability: The inherent ductility of the 304 grade allows for complex fabrication, including coiling, 180° bending, and flaring, without compromising the material's microstructural stability.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for 304L stainless steel.
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 0.75 |
| Manganese (Mn) | ≤ 2.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
| Chromium (Cr) | 18.0 - 20.0 |
| Nickel (Ni) | 8.0 - 12.0 |
| Iron (Fe) | Balance |
| Property | Value |
|---|---|
| Tensile Strength | 5155-690 MPa |
| Yield Strength | ≥ 205MPa |
| Elongation | ≥ 40% |
| Rockwell Hardness | ≤ 92 HRB |
| Brinell Hardness | ≤ 201 HB |
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1400-1455 °C |
| Thermal Expansion | 17.2 µm/m·°C |
| Thermal Conductivity | 16.2 W/m·K |
| Modulus of Elasticity | 193 GPa |
| Electrical Resistivity | 7.2 x 10⁻⁷ Ω·m |
Table 4: The Standard of Stainless Steel Seamless Tube Size Tolerance Size Chart :
| Standard | OD(D) | Tolerance（MM) | Thickness(S) | Tolerance(MM) | Length | Tolerance | |
| MM | Common | High | MM | MM | |||
| EN 10216-5 HFD | 30≤D≤219.1（D2) | ±1.0% or ±0.5mm, whicever is the greater(取较大者) | T1, T≤4 | ±15% or ±0.6mm, whicever is the greater(取较大者) | L≤6M | +5/0 | |
| T2 | ±12.5% or ±0.4mm, whicever is the greater(取较大者) | ||||||
| 219.1≤D≤610 (D1) | ±1.5% or ±0.75mm, whicever is the greater (取较大者) | T≤0.05D | +22.5%/-15% | 6 | +10/0 | ||
| T1, 0.05D | ±15% or ±0.6mm, whicever is the greater(取较大者) | ||||||
| T2, T>0.09D | ±12.5% or ±0.4mm, whicever is the greater(取较大者) | L>12 | +by agreement/0 | ||||
| EN 10216-5 CFD | D3(D≤219.1) | ±0.75% or ±0.3mm, whicever is the greater(取较大者) | T3 | ±10% or ±0.2mm, whicever is the greater(取较大者) | |||
| D4(D≤219.1) | ±0.5% or ±0.mm, whicever is the greater(取较大者) | T4 | ±7.5% or ±0.15mm, whicever is the greater(取较大者) | ||||
| ASTM A213 HFD | D≤100 | +0.4/-0.8 | D<100,S≤2.4 | +40%/0 | HFD, all size | +5.0/0 | |
| +0.4/-1.2 | D<100,2.4 | +35%/0 | |||||
| +0.4/-1.6 | D<100,3.8 | +33%/0 | |||||
| D<100,S>4.6 | +28%/0 | ||||||
| 100 | +0.4/-1.2 | D>100, 2.4 | +35%/0 | ||||
| 200 | +0.4/-1.6 | D>100,3.8 | +33%/0 | ||||
| D>100,S>4.6 | +28%/0 | ||||||
| ASTM A213 CFD | D<25 | ±0.10 | D≤38.1 | +20%/0 | CFD, D<50.8 | +3.0/0 | |
| 25≤D≤40 | ±0.15 | ||||||
| 40 | ±0.20 | ||||||
| 50≤D<65 | ±0.25 | ||||||
| 65≤D<75 | ±0.30 | D>38.1 | +22%/0 | CFD, D≥50.8 | +5.0/0 | ||
| 75≤D≤100 | ±0.38 | ||||||
| 100 | +0.38/-0.64 | ||||||
| 200 | +0.38/-1.14 | ||||||
| ASTM A269 | D≤13 | ±0.13 | D≤13 | ±15% | D<38 | +3.2/0 | |
| 13 | ±0.13 | 13 | ±10% | ||||
| 38≤D<89 | ±0.25 | D>38 | +4.8/0 | ||||
| 89≤D<140 | ±0.38 | ||||||
| 140≤D<203 | ±0.76 | ||||||
| 203≤D<305 | ±1.01 | ||||||
| 305≤D<356 | ±1.26 | ||||||
| ASTM A270 | D<25 | ±0.13 | For weld pipe all size | ±12.5% | +3.0/0 | ||
| 25-50 | ±0.20 | ||||||
| 50-75 | ±0.25 | ||||||
| 75-100 | ±0.38 | For CD SMLS pipe D≤38.1 | +20%/0 | ||||
| 100-140 | ±0.38 | +5.0/0 | |||||
| 140-200 | ±0.75 | For CD SMLS pipe D>38.1 | +22%/0 | ||||
| 200-300 | ±1.25 | ||||||
Strategic Industrial Applications
The reliability of SS 304 seamless tubes makes them a primary choice for critical infrastructure:
- Heat Transfer Equipment: Ideal for heat exchangers, condensers, and evaporators where thermal conductivity and resistance to pitting are required.
- Instrumentation & Control: High-precision small-bore tubing for hydraulic control lines, pneumatic systems, and subsea umbilical applications.
- High-Purity Systems: Used extensively in the food, beverage, and dairy industries where smooth internal surfaces are mandatory for CIP (Clean-in-Place) sterilization.
- Precision Engineering: Critical components for the aerospace and automotive sectors, specifically for fuel injection systems and structural hydraulic frames.
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
