Seamless Stainless Steel TP316 Pipe
Distinguished by its strategic Molybdenum content (2.0–3.0%) and high Nickel/Chromium ratio, our TP316 tubing provides significantly enhanced resistance to pitting and crevice corrosion compared to standard 304 grades. These pipes are indispensable for mission-critical applications in offshore oil & gas, chemical reactors, and pharmaceutical processing. Through advanced cold-drawing and precise solution annealing, GZH ensures every pipe maintains a stable austenitic microstructure and optimized durability 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 Pipe?
Seamless Stainless steel TP316 pipe is a high-grade cylindrical tube meticulously crafted from a single, solid billet of stainless steel. As a seamless product, it inherently lacks any welded seams, which is critical for ensuring superior structural integrity, enhanced pressure resistance, and reliable performance without the risk of weld-related weaknesses.
The"316"designation refers to a premium austenitic stainless steel, widely recognized for its excellent corrosion resistance, especially in chloride environments. It is an improved version of the 304 grade, distinguished by the addition of molybdenum. This alloying element significantly enhances its resistance to pitting and crevice corrosion, making it a preferred choice for marine and chemical processing applications.
Key Features and Advantages
TP316 Seamless pipes offer a powerful combination of benefits that make them invaluable across a broad spectrum of demanding industries:
Superior Corrosion Resistance: The primary differentiator is its excellent resistance to a wide range of corrosive media, particularly in acidic, alkaline, and chloride-rich environments.
Enhanced Pitting and Crevice Corrosion Resistance: The addition of molybdenum makes 316 significantly more resistant to pitting and crevice corrosion compared to 304 stainless steel, especially in saline or halogen-containing environments.
Good High-Temperature Strength: While not primarily designed for extreme high temperatures like 310H or 314, 316 stainless steel maintains good strength and creep resistance at elevated temperatures, suitable for many industrial processes.
Excellent Formability and Weldability: Despite its high performance, 316 stainless steel exhibits good ductility and can be readily formed and welded using standard techniques, although careful post-weld treatment may be required for optimal corrosion resistance.
Hygienic Properties: Its smooth, non-porous surface and corrosion resistance make it suitable for applications requiring high levels of hygiene, such as in food, beverage, and pharmaceutical processing.
Product Specifications and Data
To provide a comprehensive overview of this versatile material, here are the detailed technical specifications and performance data for 316 stainless steel.
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 Pipe Size Tolerance Size Chart :
| Standard | OD(D) | Tolerance（MM) | Thickness(S) | Tolerance(MM) | Length | Tolerance | |
| MM | Common | High | MM | MM | |||
| ASTM A312 | D≤48.3 | +0.4/-0.8 | 10.3 | +20%-12.5% | +6.0/0 | ||
| 48.3 | ±0.8 | 88.9 | +22.5%/-12.5% | ||||
| 114.3 | +1.6/-0.8 | 88.9 | +15%/-12.5% | ||||
| 219.1 | +2.4/-0.8 | D≥508, t/D≤5%,SMLS | +22.5%/-12.5% | ||||
| 457.2 | +3.2/-0.8 | D≥508, t/D>5%,SMLS | +15%/-12.5% | ||||
| 660.4 | +4.0/-0.8 | D≥508, WELD | +17.5%/-12.5% | ||||
| 863.6 | +4.8/-0.8 | ||||||
| JIS 3459 Hot-Finished Smls Pipe | D＜50 | ±0.51 | S＜4 | ±0.5 | |||
| D≥50 | ±1.0% | S≥4 | ±12.5% | ||||
| JIS 3459 Cold-Finished | D＜30 | ±0.3 | S＜2 | ±0.2 | |||
| D≥30 | ±1.0% | S≥2 | ±10.0% | ||||
| JIS G3463 Hot-Finished Smls Pipe | 100 | +0.4/-0.8 | D＜100，S<2 | / | D<50, L<7M | +7/0 | |
| D＜100，2≤S<2.4 | +40%/0 | D<50,7< L<10M | +10/0 | ||||
| D＜100，2.4≤S<3.8 | +35%/0 | ||||||
| D＜100，3.8≤S<4.6 | +33%/0 | ||||||
| D＜100，4.6≤S | +28%/0 | D<50,10< L<13M | +13/0 | ||||
| 100≤D<120 | +0.4/-1.2 | D>100, S＜2 | / | ||||
| 120≤D<160 | D>100，2≤S<2.4 | / | D<50,13M< L | +15/0 | |||
| 160≤D<200 | +0.4/-1.8 | D>100，2.4≤S<3.8 | +35%/0 | ||||
| 200≤D | +0.4/-2.4 | D>100，3.8≤S<4.6 | +33%/0 | D>50,7< L<7M | +10/0 | ||
| D>100，4.6≤S | +28%/0 | ||||||
| JIS G3463 Cold-finished | <60 | +0.4/-0.8 | D<40, S<2.0 | +0.4/0 | |||
| 60≤D<80 | ±0.3 | D<40, S≥2.0 | +20%/0 | D>50,7< L<10M | +13/0 | ||
| 80≤D<100 | ±0.4 | D≥40 | +22%/0 | ||||
| 100≤D<120 | +0.4/-0.6 | ||||||
| 120≤D<160 | +0.4/-0.8 | D>50,10M< L | +15/0 | ||||
| 160≤D<200 | +0.4/-1.2 | ||||||
| 200≤D | +0.4/-1.6 | ||||||
| GB/T 14975 冷拔(扎)钢管 | D<12.7 | ±0.3 | ±0.1 | 所有壁厚，普通级PA | +12.5%/-10% | ||
| 12.7 | ±0.15 | ||||||
| 38.1 | ±0.4 | ±0.3 | |||||
| 88.9 | ±0.9% | ±0.4 | |||||
| 139.7 | ±0.8 | 所有壁厚，高级PC | ±10% | ||||
| 203.2 | ±1.1 | ||||||
| 219.1 | ±1.6 | ||||||
| D≥323.9 | ±0.5% | ||||||
| GB/T 14976 冷拔(轧)钢管 | 6 | ±0.2 | ±0.15 | S≤3 | ±12%(10% /0高级PC) | ||
| 10≤D<30 | ±0.2 | ±0.2 | |||||
| 30≤D<50 | ±0.2 | ±0.3 | S>3 | +12.5%/-10%(10%/0高级PC) | |||
| 50≤D<219 | 0.85% | 0.75% | |||||
| D>219 | 0.9% | 0.8% | Smin, all | +22%/0(+20%/0高级PC) | |||
Common Applications
The superior corrosion resistance of TP316 stainless steel seamless pipes makes them a preferred choice for:
Marine Applications: Ideal for components exposed to saltwater, such as fittings, railings, and heat exchangers on boats and offshore platforms.
Chemical and Petrochemical Processing: Used extensively in pipelines, tanks, and equipment handling a wide array of corrosive chemicals, including acids and chlorides.
Pharmaceutical Equipment: In piping and vessels where hygiene and resistance to contamination are critical, often requiring frequent cleaning and sterilization.
Food and Beverage Industry: For processing equipment, storage tanks, and pipelines due to its non-reactive nature and ease of cleaning.
Medical Implants and Devices: In certain medical applications where biocompatibility and corrosion resistance are paramount.
Textile Industry Equipment: Handling dyes and other corrosive chemicals.
Manufacturing Process
The manufacturing of a Seamless Stainless Steel 316 Pipes is a precise, multi-step process that ensures material integrity and optimal performance:
Heating: A solid cylindrical billet of 316 stainless steel is heated to a high temperature, making it pliable for forming.
Piercing: A rotary piercing mill then pushes a mandrel through the center of the heated billet, creating a hollow shell or"tube hollow."
Rolling and Drawing: The hollow shell is subsequently rolled and drawn through a series of dies and mandrels. This process gradually reduces its outer diameter and wall thickness to achieve the exact specified dimensions.
Finishing: The pipe is cut to the required lengths, heat-treated (annealed) to relieve stress and optimize mechanical properties, and then typically pickled and passivated to enhance its surface finish and corrosion resistance. Rigorous inspections ensure the final product meets stringent quality standards.
This meticulous process ensures that every 316 seamless pipe delivers superior corrosion resistance and reliability in the most challenging environments.
