Stainless Steel Seamless Pipes China Manufacturer

The following table provides the typical supply scope for Daxin Corp stainless steel seamless pipes. Final availability should be confirmed according to the required grade, size, quantity and applicable project standard.

Important: Actual pressure and temperature capability must be calculated according to the selected grade, outside diameter, wall thickness, design code, corrosion allowance and operating conditions. It should not be determined from the material grade alone.

Explore our custom stainless steel seamless pipes, certified to ASTM/ASME/EN, ideal for high-pressure systems.

Stainless Steel 316L Seamless Pipes

Metallurgical Composition:

316L (UNS S31603) features a carbon content capped at 0.03% to prevent carbide precipitation during welding. The alloy's corrosion resistance stems from its 16-18% chromium, 10-14% nickel, and critical 2.0-3.0% molybdenum additions. Nitrogen (0.10% max) enhances strength, while manganese (≤2.0%) improves hot workability. Phosphorus and sulfur are restricted to ≤0.045% and ≤0.030% respectively to minimize hot cracking risks. The "L" grade maintains intergranular corrosion resistance per ASTM A262 Practice E even after 650°C sensitization.

Mechanical Properties:

Solution-annealed at 1040-1100°C followed by water quenching, 316L achieves:

• Tensile Strength: 485-515 MPa (ASTM A312)

• Yield Strength: 170-205 MPa at ambient, retaining 310 MPa at 200°C

• Elongation: 40% minimum in 2-inch gauge length

• Hardness: 80 HRB maximum per ASTM A370

Charpy V-notch impact values exceed 100J at -196°C, qualifying it for cryogenic LNG service (ASME B31.3 Appendix A).

Manufacturing Process:

Stainless steel seamless pipes undergo rotary piercing of forged billets at 1200°C, cold drawing with up to 80% reduction, and solution annealing in hydrogen atmosphere furnaces. Final surface treatment includes pickling (HNO3/HF bath) or electropolishing to achieve Ra<0.8μm. Hydrostatic testing at 1.5x design pressure with mandatory PMI (positive material identification) via XRF.

Critical Applications:

• Pharmaceutical: CIP/SIP systems compliant with ASME BPE-2022

• Chemical Processing: Acetic acid reactors up to 50% concentration at 120°C

• Marine: Seawater lift pumps with chloride tolerance to 5,000 ppm

• Food Processing: Milk pasteurization lines meeting FDA CFR 177.2600

Standards Compliance:

PED Category IV • EN 10217-7 • NACE MR0103 • FDA 21 CFR 178.3620

Selecting the correct stainless steel grade requires more than comparing nickel or chromium content. Buyers should consider the process medium, chloride concentration, temperature, pressure, fabrication method, cleaning requirements and expected service life.

Learn more about our TP304 stainless steel and TP316L stainless steel material options.

For high-chloride environments requiring higher strength and resistance to stress-corrosion cracking, buyers may also evaluate our duplex stainless steel seamless pipe range in 2205 or 2507.

Standard Dimension Range

We offer a wide range of stainless steel seamless pipe sizes to meet diverse application needs:

• Outer Diameter (OD): 6 mm to 914 mm

• Wall Thickness: 1 mm to 90 mm

• Maximum Length: Up to 24 meters per piece
  

These dimensions cover most industrial requirements in oil & gas, chemical, power generation, marine, and construction sectors.

Customization and Special Orders

At Daxin Corp, we understand that every project has unique specifications. That's why we provide custom stainless steel seamless pipes with:

• Non-standard dimensions (OD, wall thickness, or length)

• Special alloys (e.g., 904L, duplex stainless steel, super duplex, 600 series, 800 series)
  

• Custom tolerances and surface finishes
  

• Specific end types: Plain, beveled, or threaded
  

• Small batch production or prototyping
  

Our experienced engineering team can work closely with your technical staff to deliver pipes tailored to critical environments, such as:

• High-temperature or high-pressure systems

• Aggressive chemical media

• Corrosion-prone offshore and subsea installations

Compliance with International Standards

Our products are manufactured to meet:

• Chinese GB standards

• American ASTM/ASME standards

• European EN/DIN standards

• Third-party inspection and mill certificates (EN 10204 3.1 / 3.2) are available upon request.

A312 stainless steel seamless pipe is manufactured without a longitudinal welded seam. ASTM A 312 stainless steel pipe is commonly specified for pressure piping and corrosive service where material consistency, wall integrity, traceability and reliable inspection documentation are important.

Daxin Corp supplies austenitic stainless steel seamless pipes for oil and gas, chemical processing, energy, marine, industrial utility and process piping projects. Our engineering team reviews the grade, standard, diameter, wall thickness, operating medium and inspection requirements before confirming the production specification.

For applications requiring precision outside diameter, tight wall-thickness tolerance or controlled internal surface roughness, please refer to our stainless steel seamless tube range.

Direct Manufacturing and Technical Review

Daxin Corp combines manufacturing capability with application-based technical review. We evaluate the requested grade, standard, dimensions, testing and documentation before confirming the order.

International Standards

Our stainless steel seamless pipes can be supplied according to ASTM, ASME and EN requirements, subject to the applicable grade and production specification.

Custom Production Capability

We support both common dimensions and project-specific stainless steel seamless pipe requirements, including non-standard sizes, fixed lengths, special ends, tolerances and inspection plans.

Complete Traceability

Material heat numbers, production identification, inspection results and material certificates can be maintained throughout the supply process.

ISO 9001 Quality Management

Daxin Corp operates under an ISO 9001 quality-management system to support consistent production, documentation and continual improvement.

International Project Support

We support industrial buyers, engineering contractors, distributors and piping-system suppliers serving the United States, South Korea, the Middle East, Southeast Asia, Europe and other international markets.

As a responsible and experienced stainless steel seamless pipe manufacturer, Daxin Corp believes that product quality is the foundation of long-term cooperation and customer trust. We are committed to delivering high-performance custom stainless steel seamless pipes for sale that meet or exceed international standards through strict quality management and continuous improvement.

Comprehensive Quality Control System

We implement a full-spectrum quality management system covering every stage of production:

• Raw Material Inspection

  Only certified and traceable raw materials are used, ensuring metallurgical consistency and compliance with standards.

• Advanced Production Equipment

  Our manufacturing lines include cold drawing, cold rolling, heat treatment, straightening, and surface finishing, all operated under strict process control.

• In-Process Quality Monitoring

      Each process is monitored in real time for dimensional accuracy, surface integrity, and mechanical stability.

Final Inspection

Every stainless steel seamless pipe China undergoes rigorous testing before shipment, including:

• Hydrostatic test / Pressure test

• Eddy current and ultrasonic testing (NDT)

• PMI (Positive Material Identification)

• Dimensional and visual inspection

• Mechanical property and corrosion tests (as per request)
  
  

Certification and Traceability

We provide full documentation with every order:

• Mill Test Certificate (EN 10204 3.1 / 3.2)

• Compliance with ASTM, ASME, EN, DIN, GB standards

• Third-party inspection (BV, SGS, TUV) available upon request

Continuous Improvement & Training

As a professional stainless steel seamless pipes manufacturer, our quality team is trained regularly in line with international standards and best practices. We also maintain an internal feedback loop to:

• Improve process efficiency

• Reduce non-conformities

• Optimize customer satisfaction