316L Stainless Steel Seamless Tube
As one of the leading 316l stainless steel seamless tube manufacturers and suppliers in China, we warmly welcome you to wholesale 316l stainless steel seamless tube for sale here from our factory. All customized products are with high quality and competitive price. Also, OEM service is available.
- Product Introduction
Product Introduction
316L Stainless Steel Seamless Tube is a low-carbon austenitic stainless steel tubular product engineered through high-precision hot piercing, hot extrusion, and cold drawing processes. Unlike welded tubes, seamless tubes feature a uniform, continuous metal structure without longitudinal weld seams. This seamless integrity provides exceptional mechanical strength, superior pressure-bearing capacity, and maximum structural reliability under high-stress operating conditions.
The exceptionally low carbon content (maximum 0.03%) significantly reduces chromium carbide precipitation during welding operations, effectively mitigating the risk of intergranular corrosion in the heat-affected zone. Furthermore, the deliberate addition of 2.0% to 3.0% molybdenum enhances resistance to pitting corrosion, crevice corrosion, chloride attack, and marine environments. These metallurgical advantages make 316L the preferred material choice for aggressive chemical processing, high-purity fluid transport, and long-term infrastructure projects.
Technical Specifications & Product Parameters
|
Parameter |
Specification Detail |
|
Material Grade |
316L (UNS S31603 / 1.4404) |
|
Executive Standards |
ASTM A312, ASTM A213, ASTM A269, ASTM A789, EN 10216-5, DIN 17458, JIS G3459 |
|
Outside Diameter (OD) |
6 mm to 630 mm (1/8 inch to 24 inch) |
|
Wall Thickness (WT) |
0.5 mm to 50 mm (SCH 5S, SCH 10S, SCH 40S, SCH 80S) |
|
Length |
1m to 12m, Random Length, Cut-to-Size, or Customized Lengths |
|
Manufacturing Process |
Hot Extrusion, Hot Piercing, Cold Drawing, and Cold Rolling |
|
Surface Finishes |
Annealed & Pickled (AP), Bright Annealed (BA), Mechanical Polishing, Satin, and Mirror Polish |
|
Tube Ends |
Plain Ends, Beveled Ends, Threaded Ends, or with Protective Plastic Caps |
|
Quality Testing |
Hydrostatic Testing, Ultrasonic Testing (UT), Eddy Current Testing (ET), Positive Material Identification (PMI), and Intergranular Corrosion Testing |
|
Certifications & Traceability |
ISO 9001, PED 2014/68/EU, EN 10204 3.1 Mill Test Certificate (MTC) with complete batch traceability |
Product Features
Exceptional Corrosion Resistance: Superior resistance to pitting, crevice corrosion, and chloride-rich environments, making it ideal for marine and coastal applications.
Superior Weldability: Ultra-low carbon composition minimizes carbide precipitation during welding, preserving corrosion resistance without post-weld annealing for most applications.
High Mechanical Strength & Integrity: Seamless manufacturing ensures uniform load distribution and higher pressure ratings compared to welded alternatives.
Excellent High-Temperature Performance: Maintains stable mechanical strength, creep resistance, and oxidation resistance at elevated operating temperatures.
Hygienic Internal Surface: Smooth finishes eliminate micro-crevices, preventing bacterial growth and meeting stringent hygiene standards for pharmaceutical and food systems.
Extended Service Life: Exceptional durability in harsh corrosive environments lowers total lifecycle maintenance and replacement costs.
Chemical Composition
|
Element |
Content Range (%) |
|
Carbon (C) |
≤ 0.030 |
|
Silicon (Si) |
≤ 0.75 |
|
Manganese (Mn) |
≤ 2.00 |
|
Phosphorus (P) |
≤ 0.045 |
|
Sulfur (S) |
≤ 0.030 |
|
Chromium (Cr) |
16.00 – 18.00 |
|
Nickel (Ni) |
10.00 – 14.00 |
|
Molybdenum (Mo) |
2.00 – 3.00 |
|
Nitrogen (N) |
≤ 0.10 |
Available Surface Finishes
Annealed & Pickled (AP): Standard industrial finish with a slightly textured matte surface, optimized for general chemical and structural use.
Bright Annealed (BA): Controlled atmosphere furnace treatment yielding a bright, reflective, and scale-free surface.
180 Grit Mechanical Polish: Smooth directional polish suitable for general architectural and commercial applications.
240 Grit Fine Polish: Refined surface texture commonly utilized in food processing and dairy pipeline installations.
320 Grit / 400 Grit Satin Finish: High-smoothness finish designed for architectural trim and cleanroom environments.
600 Grit Mirror Polish: Ultra-smooth, highly reflective surface engineered for high-purity pharmaceutical piping and aesthetic applications.
Manufacturing Process Flow
Raw Material Inspection: Verifying chemical composition and metallurgical purity of certified billet stock.
Hot Piercing & Extrusion: Heating billets to optimal rolling temperatures and piercing them into hollow shells.
Hot Rolling & Sizing: Rolling the hollow shells to achieve preliminary wall thickness and outer diameter tolerances.
Solution Annealing: Heating to over 1040°C followed by rapid quenching to dissolve carbides and restore maximum corrosion resistance.
Cold Drawing / Cold Rolling: Cold working processes to achieve precise dimensional accuracy, tighter tolerances, and enhanced surface finish.
Straightening & Cutting: Mechanical straightening to ensure straightness tolerances, followed by precision cutting to specified lengths.
Pickling & Passivation: Chemical removal of surface scale and formation of a passive chromium oxide protective layer.
Rigorous Inspection: Comprehensive non-destructive testing, dimensional checks, and mechanical testing.
Protective Packaging: Securing tubes with protective caps, wrapping, and sturdy bundling for safe export transit.
Industrial Applications
Chemical and Petrochemical Processing Plants
Oil and Gas Extraction and Transmission Pipelines
Industrial Heat Exchangers and Condensers
Marine Engineering and Offshore Structures
Pharmaceutical Manufacturing Equipment
Food, Beverage, and Dairy Processing Systems
High-Pressure Vessels and Boiler Components
Industrial Water Treatment and Desalination Facilities
Power Generation and Nuclear Auxiliary Systems
Quality Assurance & Service Advantages
Extensive Industry Experience: Over two decades of expertise in manufacturing and supplying high-performance stainless steel tubular products to global markets.
Stringent Quality Control Protocols: Compliance with international manufacturing systems, monitored through multi-stage inspections from raw material to final packaging.
Complete Traceability: Every production batch is fully traceable via heat numbers stamped on the tubes and recorded on the test certificate.
Global Export Standards: Specialized export packaging designed to withstand extreme maritime shipping conditions and long-distance transit without damage.
FAQ
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