Seamless Stainless Steel Pipe & Tube
JCNMetal —Precision Seamless Stainless Steel Pipe & Tube Manufacturer
Engineered Seamless Stainless Steel Pipes
At JCNMetal, we manufacture seamless stainless steel pipes with accurate dimensions and smooth surfaces, ensuring strength and corrosion resistance under pressure and heat.
Available grades include 304, 304L, 316L, 321, 347, and 904L, widely used in petrochemical, power generation, marine, construction, and food processing industries.
Why Choose Seamless Stainless Steel Pipes
Welded pipes often fail under high pressure or corrosion stress due to weak seams.JCNMetal seamless stainless steel pipes eliminate that risk — they are formed from solid billets, ensuring uniform structure, no welding line, and consistent strength throughout.
Each pipe offers tight dimensional accuracy, smooth flow channels, and reliable resistance to pitting and stress corrosion, making them ideal for long-term service in harsh or high-pressure systems.
- Leak-free performance in hydraulic systems
- Reliable corrosion resistance in harsh environments
- Steady strength under high pressure and heat
Stainless Steel Pipe Materials Overview
| Grade (AISI) | JIS Equivalent | EN / DIN | GB |
|---|---|---|---|
| 304 | SUS304 | 1.4301 | 06Cr19Ni10 |
| 304L | SUS304L | 1.4306 | 00Cr19Ni10 |
| 304H | SUS304H | 1.4948 | 07Cr19Ni10 |
| 309S | SUS309S | 1.4833 | 06Cr23Ni13 |
| 310S | SUS310S | 1.4845 | 06Cr25Ni20 |
| 316 | SUS316 | 1.4401 | 06Cr17Ni12Mo2 |
| 316L | SUS316L | 1.4404 | 00Cr17Ni14Mo2 |
| 316H | SUS316H | 1.4436 | – |
| 316Ti | SUS316Ti | 1.4571 | 06Cr17Ni12Mo2Ti |
| 316LN | SUS316LN | 1.4429 | – |
| 317L | SUS317L | 1.4438 | 00Cr19Ni13Mo3 |
| 321 | SUS321 | 1.4541 | 06Cr18Ni11Ti |
| 321H | SUS321H | 1.4541 | – |
| 347 | SUS347 | 1.4550 | 06Cr18Ni11Nb |
| 347H | SUS347H | 1.4912 | – |
| 904L | SUS904L | 1.4539 | 00Cr20Ni25Mo4.5Cu |
| 253MA | SUS253MA | 1.4835 | 06Cr25Ni14Si2 |
| 254SMo | SUS254SMo | 1.4547 | 00Cr20Ni18Mo6CuN |
| Grade (AISI) | JIS Equivalent | EN / DIN | GB |
|---|---|---|---|
| 409 | SUS409 | 1.4512 | 11CrTi |
| 410L | SUS410L | 1.4003 | 11Cr17 |
| 430 | SUS430 | 1.4016 | 12Cr17 |
| 434 | SUS434 | 1.4113 | 10Cr17Mo2 |
| 436 | SUS436 | 1.4536 | 12Cr17Ti |
| 439 | SUS430LX | 1.4510 | 17CrTi |
| 444 | SUS444 | 1.4521 | 00Cr18Mo2 |
| Grade (AISI) | JIS Equivalent | EN / DIN | GB |
|---|---|---|---|
| 410 | SUS410 | 1.4006 | 12Cr13 |
| 410S | SUS410S | 1.4000 | 06Cr13 |
| 420 | SUS420J1 / J2 | 1.4021 / 1.4028 | 12Cr13 / 20Cr13 |
| 431 | SUS431 | 1.4057 | 15Cr16Ni2Mo |
| 440A / 440B / 440C | SUS440A–C | 1.4112–1.4125 | 7Cr17 / 9Cr18 |
| 420F | SUS420F | 1.4029 | 12Cr13S |
| 17-4PH | SUS630 | 1.4542 | 0Cr17Ni4Cu4Nb |
| 17-7PH | SUS631 | 1.4568 | 0Cr17Ni7Al |
| 15-5PH | S15500 | 1.4542 | 0Cr15Ni7Mo2Al |
| Grade (AISI) | JIS Equivalent | EN / DIN | GB |
|---|---|---|---|
| S31803 | F51 / SUS329J3L | 1.4462 | 00Cr22Ni5Mo3N |
| S32205 | 2205 / SUS329J3L | 1.4462 | 00Cr22Ni5Mo3N |
| S32750 | 2507 / F53 | 1.4410 | 00Cr25Ni7Mo4N |
| S32760 | F55 | 1.4501 | 00Cr25Ni7Mo4WCuN |
| S32550 | 255 / SUS329J4L | 1.4507 | 00Cr25Ni7Mo3CuN |
Common Challenges and JCNMetal Solutions
Our pipes are engineered to eliminate the common failures found in welded and low-quality stainless steel tubing
— ensuring durability and consistency in every application.
| Industry Issue | JCNMetal Solution |
|---|---|
| Inconsistent wall thickness during extrusion or drawing leads to pressure fluctuation or poor fit during installation. | We use multi-stage cold-drawing and ultrasonic thickness control to maintain uniform wall thickness and dimensional accuracy within ±0.05 mm. |
| Surface oxidation and discoloration after heat treatment or pickling make pipes unsuitable for visible or sanitary applications. | Pipes are annealed in a controlled atmosphere and pickled with precision to achieve clean, uniform, and contamination-free surfaces. |
| Inner wall roughness causes turbulence and scaling in fluid systems. | We apply precision mandrel drawing and optional inner polishing to achieve low surface roughness (Ra < 0.8 μm). |
| Residual stress leads to distortion or cracking during later fabrication or welding. | Controlled annealing and tension relief processes stabilize grain structure, minimizing residual stress and deformation risk. |
| Dimensional variation between batches affects connection or assembly accuracy. | Strict process tracking and batch consistency control ensure repeatable tolerances across multiple production runs. |
Where Our Pipes Are Used
Oil & Gas
Handles high pressure, resists corrosion and heat.
Chemical Plant
Performs reliably with acids, alkalis, and solvents.
Power Plant
Withstands temperature and stress in steam lines.
Marine Service
Duplex grades resist seawater pitting and wear.
Food & Beverage
Sanitary finish ensures hygiene and smooth flow.
Pharma Lines
Polished interior supports sterile fluid transfer.
Water Treatment
Durable under chloride-rich, high-pressure flow.
Building Works
Strong, corrosion-resistant pipe for structures.
Seamless Stainless Steel Pipe Sizes
| Outer Diameter (mm) | Wall Thickness (mm) | Available Length (mm) | Manufacturing Process |
|---|---|---|---|
| Φ4 – Φ1219 | 0.5 – 100 | ≤ 24000 | Cold Drawn / Hot Extruded |
Length Type: Fixed or Random Length (≤ 24000 mm)
End Type: Plain End / Beveled End / Threaded (Optional)
Standards & Tolerance
| Standard | OD Tolerance | Wall Thickness Tolerance | Length Tolerance |
|---|---|---|---|
| ASTM A312 / A213 / A269 | ±0.5% (min ±0.15 mm) | ±10% | +10 / –0 mm |
| JIS G3459 / G3463 | ±0.3 mm (≤ 48.3 mm OD), ±0.8 mm (> 48.3 mm OD) | ±10% | +10 / –0 mm |
| DIN 17456 / EN ISO 1127 D3/T3 | ±1% (min ±0.5 mm) | ±10% | +10 / –0 mm |
| GB/T14975 / GB13296 | ±0.75% | ±12.5% | +10 / –0 mm |
Surface Finish: Pickled, Bright Annealed, Polished (#180–#320), Sanitary
Inspection: 100% Hydrostatic or Eddy Current Tested
Straightness: ≤1.5 mm per meter
Roundness: ≤1.0% of OD
Quality Control You Can Trust
- Ultrasonic inspection checks the entire pipe length to ensure no internal defects or inclusions remain after forming.
- Eddy current testing verifies surface integrity and detects any pinholes or cracks invisible to the naked eye.
- Dimensional calibration maintains precise OD, wall thickness, and straightness within controlled tolerance limits.
- Solution annealing and pickling restore corrosion resistance and provide a clean, uniform surface finish.
- Hydrostatic pressure testing ensures every pipe can withstand working pressure before packaging and delivery.
Every JCNMetal Seamless Stainless Steel Pipe is produced under a fully traceable ISO 9001 quality system —
from billet inspection to final dimensional check — guaranteeing stable mechanical properties and corrosion resistance for demanding applications.
Packaging and Delivery
- Bundled with steel straps and wrapped in woven waterproof film to protect against corrosion, scratches, and moisture during handling.
- Anti-rust oil or plastic end caps applied to pipe ends to prevent oxidation and mechanical damage in transit.
- Optional wooden cases, steel frames, or export pallets available for heavy or long-length seamless pipes.
- Each JCNMetal Seamless Stainless Steel Pipe clearly labeled with grade, size, heat number, and production lot for traceability.
- Standard delivery within 7–20 days after order confirmation, depending on size, material, and production schedule.
- All pipes shipped by sea or air follow international packaging standards to ensure safe arrival and easy unloading.
Why JCN Metal
- Factory in China with in-house piercing, cold drawing, and heat treatment lines for seamless stainless steel pipe manufacturing.
- ISO 9001 certified production system with 100% dimensional and surface inspection before shipment.
- Over 60 export countries supplied with consistent quality, full documentation, and stable delivery.
- Custom OD, wall thickness, and length available to fit specialized project and engineering requirements.
- Full traceability and MTC (Mill Test Certificate) provided for every heat number and production batch.
- Experienced technical team supports material selection, process optimization, and after-sales service for global clients.