ASTM A268 TP430 Seamless Ferritic and Martensitic Stainless Steel Tube For High Temperature Service

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ASTM A268 TP430 Seamless Ferritic and Martensitic Stainless Steel Tube For High Temperature Service

ASTM A268/A268M TP430 designates seamless tubes manufactured from ferritic stainless steel, specifically Grade UNS S43000 / EN 1.4016, in accordance with the standard specification "Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service".

As a chromium-based ferritic stainless steel, TP430's primary alloying element is Chromium (typically 16.00-18.00%), which forms a passive surface oxide layer, providing its characteristic corrosion resistance. It contains very low nickel, making it a cost-effective alternative to austenitic grades like 304. The seamless manufacturing process involves extruding or piercing a solid billet, resulting in a homogeneous cross-section without a longitudinal weld seam. This eliminates a potential point of failure, granting superior pressure containment, uniform mechanical properties in all directions, and enhanced reliability for demanding applications.Which is widely used in applications requiring a combination of corrosion resistance, heat resistance, and pressure integrity.

1.Chemical & Mechanical Properties

Mechanical Properties

2. Key Adventages

• Good General Corrosion Resistance: Excellent resistance to atmospheric corrosion, oxidation, and many organic and nitric acid media.

• Stress Corrosion Cracking (SCC) Resistance: Superior to common austenitic stainless steels (e.g., 304, 316) in chloride-bearing environments.

• Moderate High-Temperature Strength: Suitable for service at elevated temperatures, offering good oxidation resistance up to approximately 760°C (1400°F).

• Magnetic Properties: Being ferritic, it is magnetic.

• Limited Formability and Toughness: Compared to austenitic grades, it has lower ductility and impact toughness, particularly at sub-zero temperatures.

3. Key Applications

• Heat Exchangers & Condensers

• Feedwater Heaters

• Automotive Exhaust Systems

• Furnace Components and Heat Recovery Systems

• General Service Corrosive Piping