Stainless Steel 304 / 304L Tube Plugs are critical components for maintaining the integrity, efficiency, and safety of heat exchangers, boilers, condensers and industrial piping systems. By providing permanent, leak-proof sealing, these plugs prevent fluid leakage, reduce operational downtime and ensure consistent system performance even in moderate temperature and mildly corrosive environments.
Manufactured from premium-grade austenitic stainless steel, SS 304 / 304L Tube Plugs offer excellent corrosion resistance, mechanical strength and dimensional accuracy. Their customizable sizes, lengths, diameters and designs allow engineers to achieve a precise fit, facilitating easy installation and long-term reliability without compromising tube sheets or system efficiency.
Compliant with ASTM A182, ASME SA182, and DIN 1.4301 / 1.4307 standards, these tube plugs are widely trusted across industries such as chemical processing, water treatment, pharmaceutical, food & beverage and general industrial applications. Each plug is backed by material traceability, quality assurance and rigorous testing, giving procurement and engineering teams a dependable, maintenance-free solution for critical industrial operations.
Request QuoteWhat are Stainless Steel 304 / 304L Tube Plugs?
Stainless Steel 304 / 304L Tube Plugs are mechanical sealing components used to isolate, block, or seal damaged or unused tubes in heat exchangers, condensers and boilers. Unlike temporary sealing methods, these plugs provide a maintenance-free, long-lasting solution that maintains system efficiency and prevents fluid leakage.
- SS 304: Offers excellent corrosion resistance in water, mild chemicals, and atmospheric conditions.
- SS 304L: Low carbon variant, ideal for welded systems, preventing carbide precipitation and maintaining corrosion resistance.
Available in tapered and parallel designs, these plugs are easy to install and minimize the risk of tube sheet damage while providing maximum sealing effectiveness.
Send Your Enquiry
Types of Stainless Steel 304 / 304L Tube Plugs
Selecting the right tube plug is essential for ensuring optimal sealing, preventing leakage and maintaining the efficiency of industrial systems. We offer a comprehensive range of precision-engineered tube plugs to suit various industrial applications:
SS 304/304L Tube Plugs Types
- SS 304 Expandable Tube Plug
- SS 304/304L Boiler Tapered Tube Plug
- SS 304 Threaded Tapered Tube Plugs
- Steel 304/304L One-Piece Tube Plugs
- SS 304 Tapered Metal Tube Plugs
- SS 304L Tapered Tube Plugs
- SS 304 Heat Exchanger Tube Plugs
- 304 Stainless Steel Pin Tube Plug
- Stainless Steel 304L Collar Tube Plug
- SS 304/304L Threaded Tapered Plugs
- SS 304L Condenser Tube Plug
- SS 304 Condenser Tube Plugging
- Stainless Steel 304L Boiler Tube Plugs
- SS 304L Metal Tapered Tube Plug
Stainless Steel 304 / 304L Tube Plug Specifications
Understanding the specifications of Stainless Steel 304 / 304L Tube Plugs is critical for selecting the right component for your industrial systems. By choosing plugs with verified standards and precise tolerances, engineers and procurement teams can ensure reliable performance, long service life, and compliance with international quality standards.
| Standard | Material Grade | Designs Available | Size Range | Finish | Tolerance |
|---|---|---|---|---|---|
| ASTM A182, ASME SA182, DIN 1.4301 / 1.4307 | Stainless Steel 304 / 304L (UNS S30400 / S30403) | Tapered, Parallel, Threaded, Custom | As per requirement | Smooth Machined / Polished | ±0.05 mm or as specified |
Stainless Steel 304 / 304L Tube Plugs Equivalent Grades
To ensure compatibility across global industrial applications, Stainless Steel 304 / 304L Tube Plugs are manufactured to meet a variety of international standards and equivalent grades.
| Standard | Grade / Equivalent | Description |
|---|---|---|
| UNS | S30400 / S30403 | Austenitic stainless steel with excellent corrosion resistance |
| WERKSTOFF NR. | 1.4301 / 1.4307 | German standard designation |
| EN | X5CrNi18-10 | European standard name |
| JIS | SUS 304 | Japanese Industrial Standard |
| BS | 304S15 / 304S16 | British Standard specification |
| GOST | 08Х18Н10 | Russian equivalent grade |
| AFNOR | Z6CN18-10 | French standard equivalent |
Chemical Composition of Stainless Steel 304 / 304L Tube Plugs
The chemical composition of Stainless Steel 304 / 304L Tube Plugs is carefully controlled to ensure optimal corrosion resistance, mechanical strength, and thermal stability in industrial applications. Selecting the right composition ensures that tube plugs maintain performance and dimensional stability even under prolonged exposure to moderate temperatures and mildly corrosive environments.
| Element | Minimum (%) | Maximum (%) |
|---|---|---|
| Carbon (C) | – | 0.08 (304) / 0.03 (304L) |
| Manganese (Mn) | – | 2.00 |
| Silicon (Si) | – | 0.75 |
| Phosphorus (P) | – | 0.045 |
| Sulfur (S) | – | 0.030 |
| Chromium (Cr) | 17.00 | 19.00 |
| Nickel (Ni) | 8.00 | 12.00 |
| Iron (Fe) | Balance | Balance |
Why it matters: Maintaining this precise chemical balance ensures that SS 304 / 304L Tube Plugs deliver reliable sealing, resist corrosion and sustain mechanical integrity, making them suitable for applications in heat exchangers, boilers, condensers and industrial piping systems.
Mechanical Properties of Stainless Steel 304 / 304L Tube Plugs
The mechanical properties of Stainless Steel 304 / 304L Tube Plugs determine their ability to withstand pressure, stress, and thermal cycling in industrial applications. Here’s the detailed breakdown:
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength (min) | 505 MPa | 73,000 psi |
| Yield Strength (0.2% Proof, min) | 215 MPa | 31,000 psi |
| Elongation (min) | 40% | 40% |
| Hardness (Brinell, max) | 201 HB | 201 HB |
| Modulus of Elasticity | 193 GPa | 28,000 ksi |
Why Choose Stainless Steel 304 / 304L Tube Plugs?
Selecting the right tube plug is critical to ensuring system reliability, efficiency, and safety in industrial applications. Using these plugs helps minimize operational downtime, prevent fluid leakage, and extend the lifespan of heat exchangers and piping systems:
Key reasons to choose SS 304 / 304L Tube Plugs include:
- Durable & Dimensionally Accurate: Precision machining ensures a secure, leak-proof fit.
- Excellent Corrosion Resistance: Ideal for water, mild chemicals, and general industrial environments.
- Customizable & Versatile: Available in multiple sizes, pressure ratings, and plug designs to suit diverse applications.
- Maintenance-Free Solution: Reduces downtime, operational cost, and maintenance frequency.
- Quality Assurance & Compliance: Each plug is tested for dimensional accuracy, mechanical strength, and corrosion resistance adhering to ASTM, ASME, and DIN standards.
- Traceable & Certified: Full material test reports (MTRs) and ISO-compliant processes ensure reliability and trust for critical industrial operations.
Stainless Steel 304 / 304L Tube Plugs Sizes
With this grade, the combination of corrosion resistance and mechanical strength allows plugs to perform reliably in moderate temperature and mildly corrosive environments, making accurate sizing critical for both standard and custom industrial applications:
| Size Type | Specifications | Suitable Applications |
|---|---|---|
| Standard Diameters | 6 mm to 50 mm (customizable on request) | Standard heat exchangers, boilers, and condensers |
| Custom Lengths | As per system requirements (typically 10 mm – 150 mm) | Specialized or custom piping systems |
| Tapered Designs | Designed to provide a tight, interference fit | Tubes requiring secure sealing with minimal tube sheet damage |
| Parallel Designs | Uniform diameter along length for consistent contact | Applications needing even pressure distribution across the tube |
| High/Moderate Pressure Variants | Rated for pressures up to 25 bar (custom options available) | Industrial boilers, pressurized heat exchangers, and piping systems |
Applications of Stainless Steel 304 / 304L Tube Plugs
Stainless Steel 304 / 304L Tube Plugs are widely used in industries where reliable sealing, corrosion resistance, and dimensional accuracy are critical. Their robust performance in moderate temperature and mildly corrosive environments makes them a preferred choice for various industrial systems.
Common applications include:
- Heat Exchangers
- Boilers and Condensers
- Industrial Piping Systems
- Chemical Processing Units
- Water Treatment & Desalination Plants
- Pharmaceutical Equipment
- Food & Beverage Processing Units
- Marine & Offshore Systems
- Pumps, Valves and Vessels
- General Industrial Machinery
Stainless Steel 304 / 304L Tube Plugs Price
The price of Stainless Steel 304 / 304L Tube Plugs depends on several factors, including dimensions, design type, quantity, manufacturing tolerances, and any special surface treatments. Custom sizes, high-pressure variants, or plugs with stringent industry specifications may have higher pricing due to precision machining, material quality, and rigorous testing requirements.
At Unifit Metalloys Inc., we offer competitive pricing by sourcing premium-grade stainless steel directly from trusted mills and maintaining efficient production processes. Each tube plug is supplied with material test reports (MTRs), traceability, and quality assurance, ensuring you receive reliable, high-performance components at the best value for your application.
Why it matters: Investing in quality SS 304 / 304L Tube Plugs reduces operational downtime, minimizes maintenance costs, and extends system life, providing a higher return on investment over standard or substandard alternatives.
Trusted Manufacturer & Supplier of Stainless Steel 304 / 304L Tube Plugs
Unifit Metalloys Inc. is a leading manufacturer and supplier of premium Stainless Steel 304 / 304L Tube Plugs, trusted by industries worldwide for precision, durability and reliable performance. Each tube plug is engineered to provide leak-proof sealing, dimensional accuracy, and corrosion resistance in heat exchangers, boilers, condensers and piping systems operating under moderate temperature and mildly corrosive conditions.
Our ISO-compliant manufacturing processes ensure that every SS 304 / 304L Tube Plug meets ASTM, ASME and DIN standards. We offer a wide range of sizes, designs and pressure ratings, including tapered, parallel, threaded, and custom plugs.
By choosing Unifit Metalloys Inc., clients gain high-performance SS 304 / 304L Tube Plugs backed by material test reports (MTRs), rigorous quality checks and traceability ensuring long service life, reduced downtime and optimal system efficiency. Our commitment to precision engineering and dependable supply makes us the preferred partner for businesses seeking reliable, maintenance-free tube sealing solutions.
Request QuoteFrequently Asked Questions About Stainless Steel 304 / 304L Tube Plug
What are Stainless Steel 304 / 304L Tube Plugs used for?
SS 304 / 304L Tube Plugs are used to seal, block, or isolate tubes in heat exchangers, boilers, condensers, and industrial piping systems, preventing fluid leakage and maintaining operational efficiency.
What makes SS 304 / 304L Tube Plugs different from other stainless steel grades?
SS 304 / 304L offers excellent corrosion resistance, mechanical strength, and dimensional stability under moderate temperatures and mildly corrosive environments, making it ideal for long-term, maintenance-free applications.
Can SS 304 / 304L Tube Plugs be used in high-temperature applications?
SS 304 / 304L Tube Plugs are suitable for moderate temperature applications (up to ~870°C intermittently). For continuous exposure to very high temperatures, specialized grades like SS 321 may be preferred.
Are SS 304 / 304L Tube Plugs resistant to chemicals and corrosion?
Yes, these plugs offer excellent corrosion resistance to water, mild acids, and other moderately corrosive media, making them suitable for chemical processing, water treatment, and food & beverage applications.
How are SS 304 / 304L Tube Plugs installed?
Installation depends on the type: tapered plugs are driven into the tube for a tight fit, threaded plugs are screwed in, and expandable plugs adjust to tube diameter, all ensuring leak-proof sealing with minimal risk of tube sheet damage.
Can SS 304 / 304L Tube Plugs be customized?
Yes, Unifit Metalloys Inc. provides customized tube plugs in terms of diameter, length, taper, pressure rating, and design type, ensuring a perfect fit and optimal performance for specialized industrial requirements.