Seamless Stainless Steel TP904L Tube
Distinguished by its high Nickel and Molybdenum content with the strategic addition of Copper (Cu), our 904L tubing offers superior resistance to strong reducing acids, particularly dilute sulfuric acid, across the entire concentration range. These tubes are indispensable for mission-critical applications in chemical reactors, seawater cooling systems, and pharmaceutical processing. Through advanced cold-drawing and precise solution annealing, GZH ensures every tube maintains a uniform microstructure and optimized mechanical strength for the most demanding industrial environments.
PREN≥35,higher than TP316L PREN≥24
What Is a Seamless Stainless Steel TP904L Tube?
TP904L Seamless Stainless Steel Tube is a high-alloy, corrosion-resistant tube crafted from a single, solid billet of an austenitic stainless steel. Unlike welded tubes, it has no weld joint, ensuring superior structural integrity and reliability, especially in highly aggressive corrosive environments. The"904L"designation refers to a specific grade known for its exceptional resistance to sulfuric acid and other corrosive media. Its unique composition, which includes high levels of chromium, nickel, and molybdenum, along with copper, provides superior resistance to pitting, crevice corrosion, and stress-corrosion cracking. The"L"stands for low carbon content, which minimizes carbide precipitation during welding and ensures the material retains its full corrosion resistance in the heat-affected zone.
Key Features and Advantages
Seamless TP904L Stainless Steel Tube offer a unique combination of benefits that make them invaluable in the most demanding industries:
Superior Corrosion Resistance: Provides outstanding resistance to sulfuric acid, as well as phosphoric and acetic acids. Its high molybdenum and nitrogen content ensures excellent resistance to pitting and crevice corrosion.
High Resistance to Stress-Corrosion Cracking: The high nickel content makes the alloy highly resistant to chloride-ion stress-corrosion cracking.
High Pressure and Temperature Tolerance: The seamless construction and robust material allow the tube to safely handle high internal pressures and moderate temperatures.
Excellent Weldability: The low carbon content and balanced composition allow for excellent weldability without the need for post-weld heat treatment to restore corrosion resistance.
Good Formability: The alloy's high ductility allows for easy forming and fabrication into complex shapes.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Stainless Steel 904L.
Table 1: Chemical Composition of Stainless Steel 904L
The composition of Stainless Steel 904L is carefully balanced to achieve its superior corrosion resistance and high strength.
| Cr | Ni | P | S | Mo | Cu | Mn | Si | C |
| 19.00 - 23.00 | 23.00 - 28.00 | ≤ 0.045 | ≤ 0.035 | 4.00 - 5.00 | 1.00 - 2.00 | ≤ 2.00 | ≤ 1.00 | ≤ 0.02 |
Table 2: Typical Mechanical Properties of Stainless Steel 904L
Stainless Steel 904L is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Property | Value (Annealed) |
| Tensile Strength | ≥ 490 MPa |
| Yield Strength | ≥ 220 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 192 HBW |
Table 3: Typical Physical Properties of Stainless Steel 904L
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
| Property | Value |
| Density | 8.0 g/cm³ |
| Melting Point | 1300 - 1390 °C approx. |
| Thermal Expansion | 16.5 µm/m·°C (20-100°C) |
| Thermal Conductivity | 13.9 W/m·K (20°C) |
| Modulus of Elasticity | 195 GPa |
| Electrical Resistivity | 0.85 x 10⁻⁶ Ω·m (20°C) |
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 | ||||||
Common Applications of Seamless TP904L Tube
The combination of high corrosion resistance and good mechanical properties of seamless Stainless Steel 904L tubes makes them a preferred choice for:
Chemical Processing: Used in reactors, heat exchangers, and piping for handling sulfuric and phosphoric acids.
Pollution Control: In scrubbers and stack liners for flue-gas desulfurization (FGD) systems.
Pulp and Paper Industry: In bleaching and other processes where corrosive media are present.
Marine Engineering: In seawater applications where resistance to corrosion is critical.
Manufacturing Process of Seamless Stainless Steel 904L Tube
The manufacturing of a Seamless Stainless Steel TP904L Tube is a precise, multi-step process:
- Heating: A solid billet of Stainless Steel 904L is heated to a high temperature.
- Piercing: A piercing mill pushes a mandrel through the center of the heated billet to form a hollow shell.
- Drawing and Sizing: The hollow shell is then rolled and drawn to reduce its diameter and wall thickness to the desired dimensions.
- Heat Treatment: The tube is solution annealed to achieve its specified metallurgical properties and to ensure optimal performance.
- Finishing: The tube is cut to length, straightened, and subjected to rigorous testing to ensure it meets the highest standards for performance and reliability. This meticulous process ensures that every seamless Stainless Steel 904L tube is built to withstand the most demanding applications
