High Quality ASTM A312 TP316L Studded Tube For Furnaces and Steel Plants

Brand Name:YUHONG
Certification:ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Model Number:ASTM A312 TP316L, TP304, TP310S, TP347H...
Minimum Order Quantity:1PCS
Delivery Time:Depends on quantity
Payment Terms:T/T, L/C
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Location: Ningbo Zhejiang China
Address: 20TH FLOOR,NO.1 NEW WORLD BUILDING ,NO.1018 MINAN ROAD,YINZHOU DISTRICT, NINGBO CITY, ZHEJIANG PROVINCE, CHINA
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1. Material Specification:

ASTM A312: Standard for seamless/welded austenitic stainless steel pipes, suitable for high-temperature and corrosive environments.

TP316L: Low-carbon (0.03% max) variant of 316 stainless steel, enhancing weldability and corrosion resistance by reducing carbide precipitation.

Studs: Small protrusions (typically resistance-welded) onto the tube surface. Made from compatible materials (often same as tube) to prevent galvanic corrosion.

Purpose: Anchor insulation or refractory linings in high-temperature systems (e.g., boilers, heaters). Studs improve thermal efficiency and safety by securing insulation.


2. Specialized Components


A. Studs (Anchor Pins)

Materials:

Typically made from TP316L to match the tube’s corrosion resistance.

Alternative alloys (e.g., Inconel 601 or RA253MA) for ultra-high-temperature (>1000°C) or sulfidation-resistant environments.

Design Variations:

Helical Studs: Spiral patterns for enhanced refractory anchoring.

Straight Studs: Vertical alignment for uniform load distribution.

Custom Shapes: Mushroom-head, crimped, or threaded studs for specific refractory adhesion.

Welding Process:

Capacitor Discharge (CD) Welding: High-speed, low-heat welding to minimize base tube distortion.

Drawn Arc Welding: For thicker studs requiring higher shear strength.


B. Base Tube (TP316L)

Enhanced Corrosion Resistance:

Low Carbon (0.03% max): Prevents sensitization in weld zones.

Molybdenum (2–3%): Improves pitting resistance in chloride-rich environments (e.g., marine or chemical plants).

Surface Treatments:

Pickling/Passivation: Removes iron contamination and restores oxide layer post-welding.

Shot Blasting: Roughened surface for better refractory bonding.


C. Stud-Tube Interface

Critical Zone:

Heat-affected zone (HAZ) around stud welds must retain corrosion resistance.

Laser Re-melting: Advanced technique to refine HAZ microstructure.

Shear Strength:

Studs are tested for minimum shear load (e.g., 500–1000 lbs per stud) to ensure refractory retention under thermal cycling.


3. Applications:

Industries: Power generation, petrochemical, chemical processing, incineration.

Use Cases: Heat exchangers, fired heaters, waste heat recovery systems, and environments requiring thermal insulation integrity under corrosive conditions.


4. Manufacturing & Quality Considerations:

Stud Welding: Precision welding to avoid compromising the tube’s integrity. Potential post-weld treatments (e.g., pickling) to restore corrosion resistance.

Standards: Stud dimensions/spacing may follow project-specific or industry guidelines (e.g., ASME for boiler applications).

Testing: Base tube undergoes hydrostatic, NDE, chemical, and mechanical tests per ASTM A312. Studs may require shear strength tests and visual inspections for weld quality.


5. Performance Factors:

Thermal Cycling: Stress concentrations at stud sites necessitate careful design to prevent cracking.

Corrosion Resistance: TP316L’s low carbon mitigates sensitization, but weld zones remain critical areas for potential corrosion.


China High Quality ASTM A312 TP316L Studded Tube For Furnaces and Steel Plants supplier

High Quality ASTM A312 TP316L Studded Tube For Furnaces and Steel Plants

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