What Is a Stainless Steel Seamless Tube?
A stainless steel seamless tube is a high-strength, corrosion-resistant tubular product manufactured without any welded joints. It is produced by piercing a solid stainless steel billet, followed by elongation and extrusion to achieve the desired size and thickness. This seamless construction eliminates weak points, providing superior durability and uniform structure, making it ideal for high-pressure and high-temperature applications. These tubes offer excellent resistance to rust, oxidation, and extreme temperatures, ensuring long-lasting performance in demanding industries such as aerospace, chemical processing, and oil & gas.
Why Choose Seamless Stainless Steel Tube?
Seamless stainless steel tubes provide significant advantages over welded alternatives. Unlike welded tubes, which have seams that can be weak points under pressure, seamless tubes offer better structural integrity and higher mechanical strength. They are designed to withstand extreme pressure and temperature variations, making them ideal for critical industrial applications. Additionally, seamless tubes offer superior corrosion and heat resistance, ensuring longevity in aggressive environments like marine and chemical processing industries. While they may have a higher initial cost, their low maintenance and extended lifespan make them a cost-effective solution in the long run.
Applications of Seamless stainless steel tubes
Seamless stainless steel tubes are widely used across multiple industries due to their strength, reliability, and corrosion resistance. Some common applications include:
- Oil & Gas Industry – Used in pipelines and drilling operations where high-pressure fluid transport is essential.
- Chemical & Petrochemical Plants – Resistant to corrosive chemicals, making them ideal for transporting aggressive substances.
- Aerospace & Automotive – Their lightweight and high-strength properties make them suitable for precision components.
- Food & Beverage Industry – Hygienic and non-reactive, preventing contamination during food and beverage production.
- Power Plants & Boilers – Withstand high temperatures and pressure fluctuations, ensuring efficiency and safety.
- Medical & Pharmaceutical – Used in sterile environments for medical instruments and pharmaceutical processing.
Grades & Specifications of Seamless Steel Tube
seamless steel tubes come in various grades and specifications to meet different industrial needs:
Common Grades & Their Benefits:
- SS 304: Excellent corrosion resistance and cost-effective for general applications.
- SS 316: Enhanced resistance to acids and chlorides, ideal for marine and chemical environments.
- SS 321: Superior high-temperature performance, suitable for heat exchanger systems.
- SS 347: Enhanced stability and resistance to intergranular corrosion in high-stress environments.
Specification of Stainless Steel Seamless Pipe:
| Size | 6NB to 1200NB IN |
|---|---|
| Schedule | SCH. 5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, XXS. |
| Type | Round, Square, Rectangle, Hydraulic, Honed Tubes |
| Length | Single Random, Double Random & Cut Length |
| End | Plain End, Beveled End |
Industry Standards & Specifications:
- ASTM A213: Tubing for high-temperature services like boilers and heat exchangers.
- ASTM A269: General-purpose stainless steel tubing with excellent corrosion resistance.
- ASTM A312: Seamless stainless steel pipes designed for high-pressure applications.
Available in different sizes, thicknesses, and finishes, these tubes meet international quality and safety standards to ensure reliability in critical applications.
Seamless Tubes Making :
Seamless tubular products are made by one of two hot forging process, rotary piercing and rolling, or extruding. seamless tubing is different than steel bar - because of the hole - there are many similarities to the extent that seamless tubing is frequently referred to as "hollow bar".
| Pipes according to ASTM A312 | ||||||||
|---|---|---|---|---|---|---|---|---|
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo |
| TP 304 | 0.08 | 2.0 | 0.045 | 0.030 | 1.0 | 18.0-20.0 | 8.0-11.0 | |
| TP 304L | 0.035 | 2.0 | 0.045 | 0.030 | 1.0 | 18.0-20.0 | 8.0-13.0 | |
| TP 316L | 0.035 | 2.0 | 0.045 | 0.030 | 1.0 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| Note: For small diameter or thin walls or both, where many drawing passes are required, a Carbon maximum of 0.040% is necessary in grades TP 304L and TP 316L. Small outside diameter tubes are defined as those less than 0.50 in. [12.7 mm] in outside diameter and light wall tubes as those less than 0.049 in. [1.20 mm] in average wall thickness (0.044 in. [1.10 mm] in minimum wall thickness). |
||||||||
SS Seamless Pipe Mechanical Analysis
| Steel Grade | N/mm 2 MIN.Tensile Stress | N/mm 2 MIN. Proof | % MIN. Elongation | HRB MAX. Hardness |
|---|---|---|---|---|
| SUS304 | 520 | 205 | 40 | 90 |
| SUS304L | 480 | 175 | 40 | 90 |
| SUS310S | 520 | 205 | 40 | 90 |
| SUS316L | 480 | 175 | 40 | 90 |
| SUS321 | 520 | 205 | 40 | 90 |
SS Pipe Sizes and Dimensions
ANSI B36.10 / ANSI B36.19
| SIZE RANGE | SCHEDULE CHART | MANUFACTURING TYPES |
|---|---|---|
| O. D. .5”-8” Available Length: 17’ - 24’ | SCH 5 | Seamless, Welded |
| O. D. : 0.5" thru 20" Available Length: 17' - 24' | SCH 10 | Seamless, Welded |
| O. D. : 0.25" thru 20" Available Length: 17' - 24' | SCH 40 | Seamless, Welded |
| O. D. : 0.5" thru 20" Available Length: 17' - 24' | SCH 80 | Seamless, Welded |
Schedule List of ASTM A312m Seamless Pipe
| 1/8" IPS(.405"O. D.) | 3 1/2" IPS( 4.000"O. D.) |
| SCH 40, 80 | SCH 10, 40, 80, 160, XXH |
| 1/4" IPS(.540"O. D.) | 4" IPS(4.500"O. D.) |
| SCH 10, 40, 80 | SCH 10, 40, 80, 160, XXH |
| 3/8" IPS(.675"O. D.) | 5" IPS( 5.563"O. D.) |
| SCH 10, 40, 80 | SCH 10, 40, 80, 160, XXH |
| 1/2" IPS(.840"O. D.) | 6" IPS(6.625"O. D.) |
| SCH 5, 10, 40, 80, 160, XXH | SCH 5, 10, 40, 80, 120, 160, XXH |
| 3/4" IPS(1.050"O. D.) | 8 ” IPS(8.625"O. D.) |
| SCH 10, 40, 80, 160, XXH | SCH 5, 10, 40, 80, 120, 160, XXH |
| 1" IPS:(1.315′O. D.) | 10" IPS(10.750"O. D.) |
| SCH 5, 10, 40, 80, 160, XXH | SCH 10, 20, 40, 80 (.500), TRUE 80(.500) |
| 1-1/4" IPS(1.660"O. D.) | 12" IPS(12.750"O. D.) |
| SCH 10, 40, 80, 160, XXH | SCH 10, 20, 40(.375), TRUE40(.406), SCH80(.500) |
| 1-1/2" IPS(1.900"O. D.) | 14" IPS(14.000"O. D.) |
| SCH 10, 40, 80, 160, XXH | SCH10 (.188), SCH40 (.375) |
| 2" IPS(2.375"O. D.) | 16" IPS(16.000"O. D.) |
| SCH 10, 40, 80, 160, XXH | SCH10(.188), SCH40(.375) |
| 2 1/2" IPS(2.875"O. D.) | 18" IPS (18.000"O. D.) |
| SCH 10, 40, 80, 160, XXH | SCH-40 (.375) |
| 3" IPS( 3.500"O. D.) | |
| SCH 5, 10, 40, 80, 160, XXH |
Ready Stock of Stainless Steel Seamless Pipe
| SS TP 304 Seamless Pipes | Stainless TP 304L Seamless Tubing |
| ASTM A213 Stainless Welded Pipe | A249 SS TP Welded Tubes |
| ASTM A358 310S Stainless ERW Pipe | A312 SS 310 Rectangular Seamless Pipe |
| ASTM A213 316 SS Rectangular Tubes | TP 316L SS ERW Tubes |
| TP 316H Stainless Coiled Seamless Tubing | SS Heat Ex-changer Tubes |
| Stainless 317L Round Tubing | ASTM A213 317 Stainless Square Seamless Pipes |
| ASME TP Stainless Electric Fusion Welding Pipes | TP 321 SS EFW Tubing |
Types of Seamless Pipes & Tubes :
• ASTM A269/A269M, Stainless steel general industry seamless tubes
• ASTM A511 / A511M, Stainless steel mechanical seamless tubes
• Seamless Steel Pipes
• Cold Drawn Steel Pipes (Seamless Tubes)
• Hot Expanded Steel Pipes (Seamless Tubes)
• API 5L Pipes (Seamless Steel Pipes)
• Seamless Boiler Steel Pipes
• Seamless Structural Steel Pipes
Why Choose Us as Your Stainless Steel Seamless Tube Manufacturer?
At Amardeep Steel Center, we pride ourselves on delivering high-quality steel tubes tailored to industry needs.
- State-of-the-Art Manufacturing: Our advanced production facilities ensure precision and durability.
- High-Quality Raw Materials: We use only certified stainless steel to maintain superior product integrity.
- Strict Quality Control: Rigorous testing ensures compliance with international standards.
- Global Export Capabilities: We supply industries worldwide with timely delivery and exceptional service.
- Customization Available: We offer tailored sizes, grades, and finishes to meet specific project requirements.
- Competitive Pricing: Our efficient processes allow us to provide the best value without compromising quality.
Choose Amardeep Steel for reliable, durable, and industry-approved stainless steel seamless tubes.
FAQs About Steel Tube
1. What is the difference between seamless and welded stainless steel tubes?
Seamless tubes are made from solid billets without welds, ensuring uniform strength and corrosion resistance. Welded tubes, however, are formed by rolling and welding steel sheets, making them more affordable but slightly weaker.
2. Why are seamless stainless steel tubes better for high-pressure applications?
Since seamless tubes do not have welded seams, they can withstand extreme pressures and temperature fluctuations without the risk of leaks or structural failure.
3. What is the best grade of stainless steel for seamless tubes?
SS 316 is ideal for marine and chemical applications due to its superior corrosion resistance, while SS 304 is widely used for general-purpose applications.
4. How do I determine the right size of seamless tube for my application?
Consider factors like internal pressure, temperature, and the type of fluid being transported. Consulting a trusted manufacturer ensures you get the right specifications for your needs.
5. Are stainless steel tubes recyclable?
Yes! Stainless steel tubes are 100% recyclable, making them an eco-friendly choice for industries looking to reduce their environmental impact.
6. What are the difference between seamless steel pipe and tubes?
Seamless steel pipes and tubes have no welds but serve different roles. Pipes transport fluids, measured by NB, while tubes, measured by OD, are used in precision and structural applications. Pipes handle high pressure in oil & gas, while tubes offer strength for aerospace, automotive, and heat exchangers.
