ASTM A312 304L Stainless Steel Seamless Pipe UNS S30403 Cold Drawn Annealed Pickled
Price:
Negotiable (Request a Quote)
MOQ:
100kg
Delivery Time:
15-25days
Brand:
Baosteel，TISCO
Product Description
304L Stainless Steel Seamless Pipe
304L (UNS S30403) is the most widely used low-carbon austenitic stainless steel globally. With its carbon content controlled below 0.03%, 304L Stainless Steel Seamless Pipe effectively prevents intergranular corrosion after welding, making it an ideal choice for chemical, petroleum, and pharmaceutical industries requiring highly reliable welded structures.
Our seamless tubes strictly adhere to the ASTM A312 standard, manufactured using cold-drawing or cold-rolling processes to ensure uniform wall thickness, a smooth inner wall, and excellent pressure resistance.
Product Specifications
| Parameter | Details |
|---|---|
| Material Grade | 304 / 304L |
| Standard | ASTM A312, ASTM A213, ASTM A269, EN 10216-5, DIN 17458, JIS G3459, GB/T 14976 |
| Outer Diameter (OD) | 6 mm – 630 mm |
| Wall Thickness (WT) | 1 mm – 40 mm |
| Length | 3 m – 12 m, or as required (custom cutting available) |
| Surface Treatment | Annealed & pickled, bright annealing, mirror polish, hairline finish |
| End Finish | Plain ends, beveled ends, threaded ends |
| Packaging | In bundles, wooden cases, or end-capped with plastic plugs |
Custom sizes available upon request. Contact us for 304L Stainless Steel Seamless Pipe non-standard dimensions.
Chemical Composition
| Element | 304 (%) | 304L (%) |
|---|---|---|
| Carbon (C) | ≤ 0.08 | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 11.0 | 8.0 – 12.0 |
| Nitrogen (N) | ≤ 0.10 | ≤ 0.10 |
304L offers lower carbon content, providing better resistance to intergranular corrosion after welding — recommended for welded structures without post-weld annealing.
Key Advantages & Features
Superior Corrosion Resistance
The 18% chromium content forms a passive oxide layer on the surface, protecting the pipe from rust and oxidation in most atmospheric, chemical, and food environments.
Seamless Precision Rolling Process
Unlike welded pipes, seamless pipes are produced by piercing a solid billet and then cold rolling or cold drawing to the final dimensions. This process ensures:
- No weld seam defects
- Uniform wall thickness
- Smooth inner and outer surfaces
- High-dimensional accuracy
Excellent Mechanical Performance
High tensile and yield strength allow the pipe to withstand high pressure, vibration, and thermal cycling without failure.
Good Weldability and Formability
304 stainless steel can be easily welded (TIG, MIG, etc.) and formed into complex shapes without cracking.
Wide Temperature Range
Suitable for cryogenic applications (down to -196°C) as well as continuous service up to 870°C (intermittent up to 925°C).
Manufacturing Process
- Raw material selection – High-quality 304 stainless steel billet from certified mills.
- Heating & piercing – Billet is heated and pierced to form a hollow shell.
- Cold rolling/cold drawing – Multi-pass precision rolling to achieve exact OD, WT, and surface finish.
- Annealing – Solution annealing to eliminate internal stress and restore corrosion resistance.
- Pickling & passivation – Removes surface scale and enhances passive film.
- Straightening & cutting – To the final length and straightness tolerance.
- Inspection & testing – 100% dimensional check, hydrostatic test, eddy current / ultrasonic test available.
- Packaging – Anti-rust protection and secure export packaging.
Applications
Thanks to its balanced properties, the 304L Stainless Steel Seamless Pipe is widely used in industries that demand cleanliness, strength, and corrosion resistance.
Petrochemical Industry
- Transporting corrosive media (oil, gas, chemicals)
- Heat exchangers and condensers
- Refinery piping systems
Food & Beverage Industry
- Food processing equipment
- Dairy and brewery pipelines
- Storage tanks and sanitary piping
Medical & Pharmaceutical
- Surgical instruments
- Medical device tubing
- Cleanroom piping systems
Construction & Architecture
- Handrails, balustrades, and guardrails
- Structural supports
- Decorative stainless steel tubes
Mechanical Engineering
- Hydraulic and pneumatic cylinders
- Precision shafts and sleeves
- Machinery parts requiring high wear resistance
Marine Environment (with care)
- Suitable for fresh water and mild marine exposure
- For direct seawater contact, consider 316 stainless steel
Quality Control & Testing
We understand that pipeline failures can be costly. That's why every shipment undergoes strict quality checks:
| Test | Standard |
|---|---|
| Chemical analysis | Spectrometer |
| Tensile test | Universal testing machine |
| Flattening test | ASTM A450 |
| Flaring test | ASTM A450 |
| Hydrostatic test | Optional, up to the pressure required |
| Eddy current / Ultrasonic test | Optional, non-destructive |
| Dimensional inspection | Micrometer, caliper, laser gauge |
| Surface inspection | Visual + endoscope for the inner surface |
Mill test certificates are provided with every shipment, traceable to the heat number.
FAQ – Frequently Asked Questions
Q: What is the difference between 304 and 304L?
A: The main difference is the carbon content. 304L has a lower carbon content (<0.03%), while 304 has <0.08%. This means that 304L is more advantageous in welding applications, preventing corrosion degradation.
Q: Do you provide third-party inspection certificates?
A: Yes, we support on-site testing by third-party organizations such as SGS, BV, TUV, and Lloyd's, and provide an EN 10204 3.1 Material Certificate (MTC) with the goods.
Contact us now for the 304L Stainless Steel Seamless Pipe latest quote!
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Company
Shanxi Zhongcheng Metal Co., Ltd.
Location
Room 2, No. 221 Tianzhang Avenue, Fengdong New City, Xi'an, Shaanxi Province
Contact Person
Zhongcheng Metal