Seamless Stainless Steel TP310MoLN Tube
Distinguished by its optimized chemistry—high Chromium (25%) and Nickel (22%) with strategic Molybdenum and Nitrogen additions—our 310MoLN tubing offers superior strength and optimized resistance to pitting and crevice corrosion in nitric acid and chloride-rich media. These tubes are indispensable for mission-critical equipment, including urea strippers, condensers, and high-pressure piping systems. Through advanced cold-drawing and precise solution annealing, GZH ensures a stable austenitic microstructure free from intermetallic phases for maximum service life.
"Specially designed for Urea Plant applications with extremely low corrosion rates in Huey tests."
What Is a Seamless Stainless Steel TP310MoLN Tube?
Seamless Stainless Steel TP310MoLN Tube (also called Seamless S31050 Stainless Steel Tube) is a high-performance, corrosion-resistant pipe crafted from a single, solid billet of a high-molybdenum and nitrogen-enhanced austenitic stainless steel. It is manufactured without a weld joint, ensuring superior structural integrity and reliability, especially under high-stress and highly corrosive conditions. The"310MoLN"designation refers to a specific grade that is a nitrogen-enhanced version of Stainless Steel 310, with a significant addition of molybdenum and a very low carbon content. This unique composition gives it an exceptional combination of high strength, good ductility, and superior resistance to pitting, crevice corrosion, and stress-corrosion cracking in chloride-rich environments.
Key Features and Advantages
TP310MOLN Seamless Stainless Steel Tube offer a unique combination of benefits that make them invaluable in the most demanding industries:
Exceptional Corrosion Resistance: The high molybdenum and nitrogen content provides outstanding resistance to pitting and crevice corrosion, particularly in harsh chloride-containing environments. It also offers excellent resistance to stress-corrosion cracking.
High Strength: The nitrogen addition significantly increases the tensile and yield strength, allowing for the use of thinner wall thicknesses and reduced material costs in high-pressure applications.
High Pressure and Temperature Tolerance: The seamless construction and robust material allow the pipe to safely handle high internal pressures and a wide range of operating temperatures.
Good Weldability: The alloy's very low carbon content and nitrogen-enhanced composition ensure excellent weldability without the risk of sensitization and intergranular corrosion.
Cost-Effectiveness: Its high strength-to-weight ratio and competitive cost often make it a more economical choice than higher-nickel alloys.
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 TP310MoLN .
Table 1: Chemical Composition of Stainless Steel 310MoLN
The composition of Stainless Steel TP310MoLN is carefully balanced to achieve its superior corrosion resistance and high strength.
| Cr | Ni | Mo | N | P | S | Mn | Si | C |
| 24.00 - 26.00 | 20.00 - 22.00 | 2.50 - 3.50 | 0.20 - 0.30 | ≤ 0.03 | ≤0.03 | ≤ 0.02 | ≤ 0.50 | ≤ 0.02 |
Table 2: Typical Mechanical Properties of Stainless Steel TP310MoLN
Stainless Steel TP310MoLN is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Property | Value (Annealed) |
| Tensile Strength | ≥ 690 MPa |
| Yield Strength | ≥ 310 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 217 HBW |
| Brinell Hardness | ≤217 HB |
Table 3: Typical Physical Properties of Stainless Steel TP310MoLN
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 | 1390 - 1440 °C approx. |
| Thermal Expansion | 16.5 µm/m·°C (20-100°C) |
| Thermal Conductivity | 16.0 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 of Seamless Stainless Steel TP310MoLN Tube
The combination of high strength and exceptional corrosion resistance of TP310MOLN Stainless Steel Seamless Tube makes them a preferred choice for:
Chemical Processing: Used in reactors, heat exchangers, and piping for handling aggressive chemicals and chlorides.
Marine Engineering: In seawater applications, desalination plants, and structural components of ships.
Offshore and Oil & Gas Industry: For piping, risers, and manifolds in offshore platforms and chemical tankers.
Pulp and Paper Industry: In digesters and bleach plant equipment where corrosive media are present.
Manufacturing Process of Seamless Stainless Steel TP310MoLN Tube
The manufacturing of a Seamless TP310MOLN Tube is a precise, multi-step process:
- Heating: A solid billet of Stainless Steel TP310MoLN 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 pipe is solution annealed to achieve its specified metallurgical properties and to ensure optimal performance.
- Finishing: The pipe is cut to length, straightened, and subjected to rigorous non-destructive testing to verify its integrity before final inspection and packaging. This meticulous process ensures that every seamless Stainless Steel TP310MoLN pipe is built to withstand the most demanding applications.
