Seamless Stainless Steel TP316 tube
Distinguished by its strategic Molybdenum content (2-3%), our TP316 tubing provides significantly enhanced resistance to pitting and crevice corrosion compared to standard 304 grades. These tubes are indispensable for mission-critical applications in marine hardware, chemical reactors, and pharmaceutical processing equipment. Through advanced cold-drawing and precise solution annealing, GZH ensures every tube maintains a uniform microstructure and excellent surface finish, delivering reliable performance for the most demanding global industrial needs.
"For applications involving extensive welding, we also provide TP316L (UNS S31603) with lower carbon content to prevent sensitization and maintain intergranular corrosion resistance."
What Is a Seamless Stainless Steel TP316 tube?
Seamless Stainless Steel TP316 tube is a high-performance, corrosion-resistant tube crafted from a single, solid billet of a high-molybdenum austenitic stainless steel. Unlike welded tubes, it has no weld joint, ensuring superior structural integrity and reliability, especially under high-stress and highly corrosive conditions. The"316"designation refers to a specific grade that is an improved version of Stainless Steel 304. The addition of molybdenum to its composition provides significantly better resistance to pitting and crevice corrosion, particularly in chloride-containing environments. This makes it a top choice for demanding applications in marine, chemical, and food processing environments.
Key Features and Advantages
seamless TP316 tubes offer a unique combination of benefits that make them invaluable in the most demanding industries:
Superior Corrosion Resistance: The molybdenum content provides excellent resistance to pitting and crevice corrosion, particularly in chloride-containing environments. It also offers enhanced resistance to sulfuric acid and other aggressive chemicals.
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 alloy can be readily welded using standard methods, and its balanced composition helps prevent hot cracking.
Good Formability: The alloy's high ductility allows for easy forming and fabrication into complex shapes.
Cost-Effectiveness: It provides a good balance of performance and cost, offering a high-performance alternative to more expensive nickel alloys for certain applications.
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 316.
Table 1: Chemical Composition of Stainless Steel 316
The composition of Stainless Steel 316 is carefully balanced to achieve its superior corrosion resistance and high strength.
| Cr | Ni | Mo | P | S | Mn | Si | C |
| 16.00 - 18.00 | 10.00 - 14.00 | 2.00 - 3.00 | ≤ 0.045 | ≤ 0.030 | ≤ 2.00 | ≤ 1.00 | ≤ 0.08 |
Table 2: Typical Mechanical Properties of Stainless Steel 316
Stainless Steel 316 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Property | Value (Annealed) |
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HBW |
Table 3: Typical Physical Properties of Stainless Steel 316
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 | 1375 - 1400 °C approx. |
| Thermal Expansion | 16.5 µm/m·°C (20-100°C) |
| Thermal Conductivity | 16.3 W/m·K (20°C) |
| Modulus of Elasticity | 193 GPa |
| Electrical Resistivity | 0.74 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
The combination of high corrosion resistance and good mechanical properties of seamless Stainless Steel 316 tubes makes them a preferred choice for:
Chemical Processing: Used in reactors, heat exchangers, and piping for handling sulfuric acid, phosphoric acid, and other aggressive chemicals.
Pulp and Paper Industry: In equipment for bleaching and other processes where corrosive media are present.
Marine Engineering: In seawater applications where resistance to saltwater corrosion is critical.
Food and Beverage: In equipment for processing highly acidic foods and beverages.
Manufacturing Process
The manufacturing of a Seamless Stainless Steel TP316 tube is a precise, multi-step process:
- Heating: A solid billet of Stainless Steel 316 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 316 tube is built to withstand the most demanding applications.
