Stainless Steel Pipes | TP 347H/310S Heat Exchanger Excellence

Stainless Steel Pipes | TP 347H/310S Heat Exchanger Excellence

Product Overview

Our TP 347H/310S stainless steel pipes are engineered for extreme heat, corrosion resistance, and structural reliability in critical applications such as heat exchangers, boilers, and stainless steel exhaust pipes. Designed to meet ASTM/ASME standards, these pipes excel in environments with high-temperature steam, acidic media, and chloride exposure. Their mirror-polished surfaces and seamless/welded manufacturing ensure compliance with FDA, EHEDG, and 3-A sanitary standards for industries like pharmaceuticals and food processing.

Technical Specifications

Key Mechanical Properties

Tensile Strength

• TP 347H: ≥515 MPa | 310S: ≥485 MPa
  The high tensile strength ensures structural integrity in high-pressure systems like chemical reactors and superheaters. TP 347H’s niobium-stabilized microstructure prevents intergranular corrosion even at 870°C, while 310S retains strength up to 1100°C in furnace components.

Bending Strength

• Both grades exhibit excellent ductility, allowing cold bending up to 180° without cracking. Compatible with stainless steel exhaust pipe clamps for secure installations in automotive and aerospace exhaust systems.

Material Properties & Advantages

1. Heat Resistance

   • TP 347H: Stable up to 870°C (1600°F), ideal for boiler tubes and radiant superheaters.
   • 310S: Withstands 1100°C (2012°F) in continuous service, perfect for burners and heat treatment furnaces.

2. Corrosion Resistance

   • TP 347H: Niobium addition prevents carbide precipitation, resisting chloride-induced pitting and stress corrosion cracking (SCC).
   • 310S: 25% chromium and 20% nickel provide oxidation resistance in sulfur-rich and acidic environments.

3. Hygienic Design

   • Mirror-polished surfaces (Ra ≤0.4 μm) inhibit bacterial growth, compliant with FDA and EHEDG standards for pharmaceutical and food-grade systems.

Weight Calculation Formula

Weight (kg/m) = (OD – WT) × WT × 0.02491
Example: For a stainless steel exhaust pipe (OD: 141.3 mm, WT: 6.55 mm):
(141.3 – 6.55) × 6.55 × 0.02491 = 22.3 kg/m

Why Stainless Steel Pipes Corrode?

While TP 347H and 310S are highly corrosion-resistant, degradation can occur under specific conditions:

1. Chloride Exposure: Prolonged contact with seawater or de-icing salts induces pitting, especially in stagnant or low-oxygen environments.
2. Galvanic Corrosion: Direct contact with carbon steel or copper in conductive fluids accelerates electrochemical breakdown.
3. Improper Welding: Unpassivated welds or excessive heat input during fabrication create vulnerable zones for intergranular or crevice corrosion.
4. Thermal Cycling: Repeated heating and cooling can cause thermal fatigue, leading to micro-cracks in high-temperature applications like pipe supports stainless steel systems.

Identification & Marking

• Laser Etching: Permanent labels include grade (TP 347H/310S), OD, WT, heat number, and ASTM/ASME compliance.
• Color Coding: Red bands for TP 347H and blue bands for 310S ensure quick visual identification in storage and installation.

Applications

• Power Generation: Boiler tubes, superheaters, and pipe supports stainless steel for thermal power plants.
• Automotive: High-performance stainless steel exhaust pipes and clamps for durability under extreme heat.
• Oil & Gas: Acid transport pipelines, hydraulic fracturing lines, and offshore rig components.

Why Choose Our Stainless Steel Pipes?

1. Certified Quality: Compliant with ASTM, ASME, and EN standards. Full traceability with Mill Test Reports (MTRs) and 3.1 certification.
2. Custom Solutions: Tailored stainless steel exhaust pipe clamps, bends, and supports for complex installations.
3. Global Inventory: Immediate availability of TP 347H/310S pipes in Sch5s–XXS schedules and custom dimensions.
4. Sustainability: 100% recyclable material with a 50+ year lifespan, reducing environmental impact.
5. Technical Support: 24/7 engineering assistance for welding protocols, corrosion prevention, and system optimization.