304 ss seamless tubing
2. Standard: ASTM A269, ASTM A213, compliant with standard global pipeline and equipment engineering specifications
3. Process: 100% solid-billet cold drawn or cold rolled seamless, entirely free from any weld line defects
4. Size Range: Fractional and metric outside diameters from 1/8" up to 4" with exact wall gauge calibration
5. Heat Treatment: Homogeneous solution annealing followed by rapid cooling to optimize core microstructural density
6. Surface Finish: Solution annealed and pickled (SA&P), descaled matte, or precision outer-diameter polished
7. Application: Industrial instrumentation systems, hydraulic control lines, heat exchanger manifolds, and pressure vessels
8. Service Advantage: Fast engineering support, large raw material stock, and standard Mill Test Certificates (MTC) provided
9. Packaging: Secure international bundle packing wrapped in waterproof canvas with plastic end plugs attached
10. Key Advantage: Combines supreme internal pressure-bearing safety margin with exceptional lifetime durability
304 SS Seamless Tubing – Premium Austenitic Steel Solution for High-Pressure Industrial Applications
Engineered through solid-billet cold drawing technology, 304 ss seamless tubing from Hebei All Trust Steel Co., Ltd delivers unmatched structural integrity across mission-critical fluid systems. We produce seamless tube with an annual manufacturing capacity of over 15,000 tons and implement 100% hydraulic testing, eliminating weld-line weaknesses completely. The products are produced as per ASTM A213/A269 with a minimum tensile strength of 515 MPa and minimum yield strength of 205 MPa. Our innovative cold reduction technique delivers ultra-precise wall tolerances of ±0.05 mm on exterior diameters from 1/16" to 5".
This tubing is supplied with full EN 10204 3.1/3.2 Mill Test Certificates and stringent PMI analysis to ensure 18% chromium and 8% nickel composition for enhanced passive corrosion resistance in severe petrochemical, pharmaceutical and instrumentation applications.
What Makes 304 SS Seamless Tubing Essential for Critical Systems
Longitudinal welds are absent, which results in a uniform grain structure across the tube wall. This removes the Heat Affected Zone (HAZ) that is characteristic to welded alternatives, where failure is often caused by localised corrosion and stress fractures.
The product produced by rotary piercing will have a burst pressure rating roughly 20 percent greater than the same product made via welding. Continuous metallurgical structure - uniform mechanical qualities across the whole circle.
High-purity applications benefit from the smooth interior bore which avoids bacterial adherence and facilitates thorough Clean-in-Place (CIP) sterilisation. It is thus essential in pharmaceutical processing lines and food-grade heat exchangers where contamination risks have to be minimal.
Technical Specifications & Available Dimensions
| Parameter | Specification |
|---|---|
| Manufacturing Standard | ASTM A213, ASTM A269, ASME SA213, EN 10216-5 |
| Material Grade | 304 SS (UNS S30400 / 1.4301) |
| Production Process | Cold Drawn / Cold Rolled / Precision Extruded |
| Outer Diameter Range | 1/16" – 5" (1.59 mm – 127 mm) |
| Wall Thickness | 0.010" – 0.200" (0.25 mm – 5.08 mm) |
| Standard Lengths | 5.8 m / 6 m / 11.8 m / 12 m / Custom Cut |
| Surface Finish Options | Bright Annealed (BA) / Solution Annealed & Pickled (SA&P) / Mirror Polished |
| End Configuration | Plain End / Square Cut / Burr-Free |
| Tensile Strength (Min) | 515 MPa |
| Yield Strength (Min) | 205 MPa |
| NDT Methods | Eddy Current / Ultrasonic / Hydrostatic / Air-Under-Water |
| Quality Certificates | EN 10204 3.1 & 3.2 MTC / ISO 9001:2015 / PED |
| Third-Party Inspection | SGS / BV / TÜV / DNV / ABS Accepted |
Core Industrial Applications
Heavy Petrochemical & Hydraulic Systems
Your high pressure instrumentation lines need tubing that can endure intense vibration and exposure to corrosive environments. Seamless design eliminates fatigue cracking at weld seams for long-term dependability in control circuits and sample lines over 10,000 psi.
Pharmaceutical and food processing
The inside surfaces of sterile processing environments should be smooth with Ra values less than 0.8 μm. We provide a bright annealed finish that leaves no cracks in which germs might breed and conforms to strict FDA and 3-A hygienic regulations for direct touch with goods.
Marine & Aerospace Engineering
Corrosion at welded seams is accelerated by salt-spray atmospheres. 304 ss seamless tubing has a continuous passive oxide layer that offers improved resistance in coastal installations and cooling circuits where repair of components is prohibitive.
Tubes for Heat Exchangers & Condensers
Differential expansion of weld zones due to thermal cycling. Seamless structure provides dimensional stability during temperature variations from cryogenic -196°C to intermittent operation at 870°C, improving thermal transfer efficiency.
Manufacturing Excellence & Quality Assurance
Every production batch undergoes four-tier quality validation before shipment.
Raw Material Verification
Spectrographic analysis confirms precise chromium-nickel balance. We reject any mixed scrap material, using only certified virgin stainless steel from our network of 15+ qualified mills.
In-Process Monitoring
Wall thickness is measured during cold drawing using laser-guided micrometres every 50 mm. This feedback in real time maintains the tolerances of ±0.05 mm across the whole length.
Mandatory Non-Destructive Testing
You receive tubing that has cleared 100% eddy current scanning to detect subsurface inclusions. High-pressure hydrostatic testing at 1.5× rated pressure validates leak integrity before bundling.
Final Documentation Package
Each shipment has comprehensive heat number traceability, EN 10204 3.1 Mill Test Certificates, PMI reports on alloy composition, and dimensional inspection records for full audit compliance.
Why Hebei All Trust Steel Delivers Superior Value
Immediate Availability from 5,000+ Ton Inventory
Stock orders ship within 3–5 days. Our rolling inventory covers common fractional and metric sizes in both solution annealed and bright annealed finishes.
Custom Processing Capabilities
Need fixed-length cutting with deburred ends? Require laser-drilled orifices for distribution manifolds? Our precision machining services include bending to tight radii, threading, and beveling—all performed in-house to maintain quality control.
Global Logistics Support
We assist with shipping containers from Shanghai, Ningbo, Tianjin, Qingdao, Shenzhen ports. Choose FOB, CIF or DDP terms according to your Incoterms choice. Increase your purchasing efficiency with mixed shipments of flanges, valves and fittings.
Technical Engineering Assistance
Our material scientists provide corrosion resistance analysis for your specific media. We verify CAD drawings, calculate stress allowables per ASME B31.3, and recommend optimal wall schedules to balance cost against safety margins.
FAQ
Q：What primary pressure-bearing advantage does this product possess over welded options?
A：Formulated via hot-piercing and advanced cold reduction without any joints, the tubing offers a completely solid cross-section that maximizes burst safety margins and ensures uniform circumferential strength throughout the entire length.
Q：What does this seamless tube provide for tight radius bends with complex routeing?
A: The tubing is completely annealed austenitic with a very ductile structure enabling perfect field bending, flaring and manipulation without creating stress cracks or wall thinning during installation.
Q：What strict leak-detection testing matrix is enforced to validate the physical safety of these seamless lines?
A：Every single piece must clear continuous online eddy current scans combined with high-pressure hydrostatic leakage pressure validation or comprehensive air-under-water bubble diagnostics before packaging approval.
Q：Can the outer circumference be tailored to interface seamlessly with high-precision double-ferrule compression systems?
A：Yes, we maintain ultra-precise micro-tolerance limits on the external circumference, ensuring a perfect flush seal and robust holding force with Swagelok, Parker, and other global instrumentation compression fittings.
Q：Is the product suitable for cryogenic temperature applications?
A：Absolutely. The austenitic structure retains excellent toughness and ductility down to -196°C liquid nitrogen temperatures, unlike ferritic steels which become brittle and prone to catastrophic fracture.
Q：How do I verify the authenticity of the material grade?
A：Each batch includes certified PMI analysis reports and EN 10204 3.1 Mill Test Certificates detailing chemical composition, mechanical test results, and full heat number traceability for complete material verification.
Contact Us
Request technical data sheets, material certifications for 304 ss seamless tubing, or project-specific quotations by contacting our engineering team at info@hballtrust.com today.
