Titanium Welding Pipe For Heat Exchanger

Titanium Welding Pipe For Heat Exchanger

1. Core Material Advantages: GR2 Titanium's α-Crystal Structure & Chemical Purity​

Titanium seamless pipes for heat exchangers are manufactured from GR2 (CP-Ti, UNS R50400), a commercially pure titanium grade with a single α-crystal structure​ (hexagonal close-packed, HCP). This structure endows the material with three key properties tailored for heat exchanger applications:

Excellent Formability: The α-phase allows for easy hot/cold working (e.g., bending, flaring) without cracking, enabling complex tube designs for optimal heat transfer.

Moderate Strength: GR2 offers a tensile strength of ≥345 MPa (annealed state), which is 1.2x higher than 316L stainless steel while being 40% lighter (density: 4.51 g/cm³). This strength-to-weight ratio reduces structural loads in heat exchanger systems.

Outstanding Corrosion Resistance: The α-crystal structure promotes the formation of a dense, self-healing TiO₂ passive film, which resists degradation in harsh environments (e.g., seawater, chlorides, nitric acid). For example, GR2 exhibits a corrosion rate of <0.0005 mm/year​ in full seawater immersion over 30 years, far outperforming stainless steel.

2. Manufacturing Process: Seamless Precision for Heat Exchanger Reliability​

Our titanium seamless pipes are produced via extrusion or piercing​ (hot working) followed by cold drawing/annealing, ensuring:

No Weld Seams: Unlike welded tubes, seamless pipes have a uniform microstructure without weak points, making them ideal for high-pressure (up to 4.0 MPa) and high-temperature (up to 250°C) heat exchanger applications.

Strict Dimensional Tolerances: Compliant with ASTM B338/ASME SB338​ standards, our pipes maintain tight control over outer diameter (OD), wall thickness (WT), and straightness. For example, OD tolerance for 19.05–38.1 mm pipes is ±0.004 inches (±0.102 mm), ensuring compatibility with standard heat exchanger tube sheets.

Surface Finish Options: Available in pickled​ (removes surface oxides for improved corrosion resistance) or polished​ (Ra ≤0.8 μm for hygienic applications like food/pharmaceutical heat exchangers).

3. Critical Applications in Heat Exchangers​

GR2 titanium seamless pipes are the material of choice for heat exchangers in industries where corrosion resistance and reliability are paramount:

Seawater Desalination: Used in multi-stage flash (MSF) and reverse osmosis (RO) evaporators, where they resist chloride-induced pitting and crevice corrosion.

Chemical Processing: Ideal for heat exchangers handling nitric acid (65% boiling, corrosion rate <0.005 mm/year), sodium hypochlorite (200 g/L, 60°C, zero corrosion), and wet chlorine (80°C, no SCC).

Food & Pharmaceutical: Employed in pasteurizers and sterilizers due to their non-toxicity, cleanability, and resistance to organic acids.

4. Customization Capabilities: Tailored to Your Heat Exchanger Design​

We offer flexible customization options to meet specific project requirements:

Size Range: OD from 15 mm to 114 mm (larger diameters available on request), with wall thicknesses from 0.5 mm to 7 mm.

Length Options: Cut-to-length service (up to 12 m) to minimize material waste during installation.

Material Grades: While GR2 is standard, we also supply GR1 (higher purity, better formability) and GR7 (palladium-alloyed, enhanced corrosion resistance) for specialized applications.

5. Quality Assurance: Compliance with International Standards​

All pipes undergo rigorous testing to ensure compliance with ASTM B338​ and ASME SB338​ standards:

Non-Destructive Testing (NDT): 100% ultrasonic testing (UT) and eddy current testing (ET) to detect internal defects.

Mechanical Testing: Tensile strength, yield strength, and elongation tests per ASTM E8/E21.

Chemical Analysis: Spectrographic analysis to verify compliance with GR2 composition limits (e.g., Fe ≤0.30%, O ≤0.25%).

6. Product Specification Table​

The following table summarizes the key specifications of our titanium seamless pipes for heat exchangers:

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