Seamless Stainless Steel TP314 Pipe
Distinguished by its high Silicon (Si) content, our TP314 (AISI 314) tubing develops a protective oxide layer that ensures exceptional stability at service temperatures up to 1150°C (2100°F). This makes them indispensable for mission-critical applications in radiant tubes, furnace components, and high-temperature petrochemical processing. Through advanced cold-drawing and precise solution annealing, GZH guarantees uniform microstructure and optimized creep strength, providing a reliable alternative to standard heat-resistant grades in aggressive thermal cycling conditions.
"Our optimized chemical balance, specifically the high Si levels, provides superior resistance to carburizing atmospheres compared to TP310S."
What is a Seamless Stainless Steel TP314 Pipe?
TP314 Seamless Stainless Steel Pipe is a high-performance cylindrical tube manufactured from a single, solid billet of stainless steel, free from any welded seams. This seamless construction is vital for ensuring superior structural integrity, leak prevention, and reliability, especially in critical applications.
The"314"designation identifies a specific austenitic stainless steel grade known for its exceptional high-temperature strength and remarkable oxidation resistance. This grade is characterized by a higher silicon content compared to other stainless steels, which plays a key role in its enhanced performance under extreme thermal conditions.
Key Features and Advantages
TP314 Stainless Steel seamless Pipe offer a unique combination of benefits that make them invaluable in demanding high-temperature and corrosive environments:
Superior High-Temperature Oxidation Resistance: The elevated silicon content is the primary differentiator, providing outstanding resistance to oxidation and scaling, performing exceptionally well under continuous exposure to high temperatures.
Excellent Creep Strength: It exhibits very good creep rupture strength, allowing it to maintain its structural integrity and resist deformation when subjected to sustained stress at elevated temperatures.
Good Corrosion Resistance: While optimized for high-temperature service, it also offers a respectable level of general corrosion resistance, suitable for various aggressive environments.
Seamless Reliability: The absence of welds eliminates potential weak points, making it ideal for high-pressure and critical applications where structural soundness is paramount.
Thermal Stability: Designed to perform reliably under extreme thermal cycling and sustained heat, making it durable for long-term use in challenging conditions.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for TP314 stainless steel.
Table 1: Chemical Composition of Seamless Stainless Steel TP314 Pipe The unique properties of 314 stainless steel are largely due to its balanced composition, with silicon being a key element for high-temperature performance.
| C | Mn | P | S | Si | Cr | Ni |
| ≤0.25 | ≤2.00 | ≤0.045 | ≤0.030 | 1.50－3.00 | 23.00－26.00 | 19.00－22.00 |
Table 2: Typical Mechanical Properties of Stainless Steel TP314
Stainless Steel 314 is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.
| Property | Value (Annealed) |
| Tensile Strength | ≥ 520 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HBW |
Table 3: Typical Physical Properties of Stainless Steel TP314
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
| Property | Value |
| Density | 7.9 g/cm³ |
| Melting Point | 1390 - 1420 °C approx. |
| Thermal Expansion | 16.5 µm/m·°C (20-100°C) |
| Thermal Conductivity | 14.2 W/m·K (20°C) |
| Modulus of Elasticity | 200 GPa |
| Electrical Resistivity | 0.78 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 OF Seamless Stainless Steel TP314 Pipe
The exceptional high-temperature oxidation and creep resistance of 314 stainless steel seamless pipes make them a preferred choice for:
Furnace Components: Ideal for furnace linings, radiant tubes, muffles, and other parts that require extreme heat and oxidation resistance.
Heat Exchangers: Used in demanding heat exchange applications where materials must withstand high temperatures and corrosive gases.
Thermal Processing Equipment: Components for kilns, retorts, and annealing boxes in industries like metallurgy and ceramics.
Industrial Boiler Parts: Suitable for boiler tubes, hangers, and supports in power generation and industrial heating systems.
High-Temperature Structural Parts: In any application requiring sustained strength and integrity under extreme thermal loads.
Manufacturing Process OF Seamless Stainless Steel TP314 Pipe
The manufacturing of a 314 seamless pipe is a precise, multi-step process designed to ensure material integrity and performance:
- Heating: A solid cylindrical billet of 314 stainless steel is heated to a high temperature to make it ductile.
- Piercing: The heated billet is then pierced through its center using a rotary piercer with a mandrel, forming a hollow shell.
- Rolling and Sizing: This hollow shell undergoes multiple passes through rolling and drawing mills to reduce its diameter and wall thickness to the precise desired dimensions.
- Finishing: The formed pipe is cut to length, subjected to heat treatment (annealing) to optimize its mechanical properties, and then cleaned (e.g., pickling) and inspected to meet the highest quality standards.
This meticulous process ensures that every 314 seamless pipe delivers superior performance and reliability in the most demanding high-temperature environments.
