UNS S31400|1.4841|TP314 Seamless Stainless Steel Pipe

What Is a Seamless Stainless Steel TP314 Pipe?

TP314 Seamless Stainless Steel Pipe (UNS S31400 / EN 1.4841)

High-Temperature Oxidation-Resistant Stainless Steel Pipe Solution

TP314 Seamless Stainless Steel Pipe (UNS S31400 / EN 1.4841) is a high-silicon, heat-resistant austenitic stainless steel pipe specifically engineered for extreme temperature and oxidation environments.

Manufactured from solid billets using hot piercing and precision rolling processes, TP314 seamless pipes feature:

• Fully homogeneous microstructure
• No weld seams or heat-affected zones (HAZ)
• Superior pressure resistance and structural reliability

Why Choose TP314 for High-Temperature Applications?

Key Features and Technical Advantages

The defining feature of TP314 stainless steel is its elevated silicon (Si) content (1.50% – 3.00%), combined with high chromium and nickel levels. This unique composition:

• Forms a dense and stable oxide layer
• Significantly improves oxidation resistance
• Enhances mechanical stability at extreme temperatures

Compared to conventional grades like 304 or 316, TP314 performs reliably in continuous service up to 1150°C (2100°F).

1. Exceptional Oxidation and Scaling Resistance

The high chromium (23–26%) and silicon content creates a protective oxide film, allowing long-term exposure to high-temperature oxidizing atmospheres without degradation.

2. Superior Creep and Rupture Strength

TP314 maintains excellent dimensional stability under sustained thermal stress, making it ideal for:

• Furnace components
• Heat treatment systems
• Continuous high-load environments

3. Seamless Structural Integrity

Seamless construction ensures:

• Higher pressure ratings
• Uniform wall thickness and strength
• No weld defects or localized corrosion risks

4. Excellent Thermal Stability

High nickel content improves:

• Resistance to thermal fatigue
• Stability under cyclic heating and cooling conditions

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.

Product Specifications and Data

Stainless Steel 314 is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.

These physical properties highlight the material's ability to perform reliably under a wide range of conditions.

Table 4: The Standard of Stainless Steel Seamless Pipe Size Tolerance Size Chart :

Typical Mechanical Properties

Typical Mechanical Properties

Typical Physical Properties

Typical Physical Properties

Chemical Composition

Chemical Composition

Dimensional Standards and Tolerances

TP314 seamless pipes are produced in compliance with global dimensional standards for precise engineering fit:

• ASTM A312 / ASME SA312 – Seamless stainless steel pipes
• ASTM A213 / ASME SA213 – Seamless stainless steel boiler and heat exchanger tubes
• EN 10216-5 and JIS G3459 equivalents

Typical tolerance ranges include:

• Outer Diameter (OD): ±0.4 mm to ±1.6 mm depending on size
• Wall Thickness (WT): +15% / -12.5% (typical ASTM range)
• Length: random 5–7 m, or fixed / specified lengths on request
• Straightness: maximum 1.5 mm per metre

Common Industrial Applications

TP314 is widely used in industries requiring extreme heat resistance and structural stability:

Quality Assurance and Manufacturing Process

Our TP314 seamless pipes are produced under strict quality systems to ensure global compliance and reliability:

Uniform heating of high-purity 314 stainless steel ingots for optimal workability.

Rotary piercing to form a seamless hollow shell with consistent structure.

Precision dimensional control to achieve exact OD and wall thickness tolerances.

Non-Destructive Testing (NDT):

Pressure Testing:

We specialize in high-performance stainless steels, Super Duplex, and nickel alloys, delivering reliable solutions for the most demanding industrial environments.

Every TP314 seamless pipe undergoes strict quality control from billet selection through forming, heat treatment and final inspection:

TP314 vs TP310 / TP309S – Technical Comparison

TP314 (UNS S31400 / EN 1.4841) is a high-silicon austenitic heat-resistant stainless steel. It is compared here with TP310 and 309S, which are used in similar high-temperature oxidation service.

Chemical and Metallurgical Differences

• Silicon content: TP314 contains 1.50–3.00% Si, significantly higher than TP310 (≤ 1.50%) and 309S (≤ 1.00%).
• Chromium: 23.0–26.0% Cr provides the basis for oxidation resistance.
• Nickel: 19.0–22.0% Ni stabilises the austenitic structure.
• Carbon: controlled to 0.25% max for high-temperature strength.

High-Temperature Performance

• Oxidation and scaling: The high silicon content of TP314 forms a dense protective oxide scale, offering superior resistance to scaling and carburization compared with TP310.
• Temperature limit: TP314 is used in continuous service up to approximately 1150°C.
• Creep strength: TP314 provides good creep and rupture strength for furnace components.
• Thermal cycling: Good resistance to thermal fatigue in cyclic furnace service.

Selection Guide

• ChooseTP314 for furnace rollers, radiant tubes, and high-temperature furnace parts where scaling resistance is critical.
• ChooseTP310 for general high-temperature oxidation service where silicon-enhanced resistance is not required.
• Choose309S for moderately elevated temperatures and where cost is a primary consideration.

Ordering Information

• Specify grade (UNS S31400 / EN 1.4841) and standard.
• Provide OD × wall thickness, length and quantity.
• State testing, certification and documentation requirements.

Frequently Asked Questions