304 Stainless Steel Seamless Tube

304 Stainless Steel Seamless Tube represents the industry standard for austenitic stainless steel tubular solutions. Produced through advanced hot extrusion, cold drawing, or cold rolling processes, these tubes possess absolute structural continuity without any welded seams.

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Product Introduction

Product Overview

Compared to welded alternatives, seamless tubes deliver significantly higher pressure-bearing capacity, superior structural integrity under stress, enhanced resistance to intergranular corrosion, and extended operational lifespans. They serve as the foundational material for critical infrastructure across oil and gas, petrochemical processing, power generation, and pharmaceutical manufacturing.

Product Specifications

Item	Specification
Product	304 Stainless Steel Seamless Tube
Material Grade	ASTM TP304 / UNS S30400 / EN 1.4301
Outer Diameter	6 mm – 630 mm
Wall Thickness	0.5 mm – 50 mm
Length	Up to 12 meters or customized
Manufacturing Process	Hot Rolled, Cold Drawn, Cold Rolled
Surface Finish	AP, BA, Pickled, Polished, Hairline
Applicable Standards	ASTM A312, ASTM A213, ASTM A269, EN10216-5, JIS G3459
Quality Testing	PMI, UT, Hydrostatic Test, Eddy Current Test
Certifications	ISO9001, PED, MTC EN10204 3.1

Key Material Advantages

Superior Corrosion Resistance: Performs exceptionally well in humid, acidic, chemical, marine, and food-processing operating environments.

High Pressure Resistance: The continuous, seamless structure guarantees superior pressure-bearing capability for high-stress applications.

Versatile Surface Finishes: Available in multiple architectural and industrial finishes including BA, AP, Pickled, Mirror, and Satin.

High Dimensional Accuracy: Advanced cold processing and strict tolerance controls guarantee precise outer diameter and wall thickness consistency.

Superior Weldability: Perfectly balanced chemical composition allows for seamless fabrication and secondary welding operations.

Long Operational Service Life: Exceptional durability minimizes facility downtime and lowers long-term maintenance costs.

Chemical Composition & Mechanical Properties

Element	Content (%)
Carbon (C)	≤ 0.08
Silicon (Si)	≤ 0.75
Manganese (Mn)	≤ 2.00
Phosphorus (P)	≤ 0.045
Sulfur (S)	≤ 0.030
Chromium (Cr)	18.0 – 20.0
Nickel (Ni)	8.0 – 10.5
Iron (Fe)	Balance

Industry Applications

Oil & Gas Pipelines
Chemical Processing Plants
Petrochemical Refining Units
Industrial Heat Exchangers
High-Pressure Boilers
Food Processing Equipment
Dairy Processing Infrastructure
Pharmaceutical Piping Systems
Municipal Water Treatment
Marine Engineering & Shipbuilding
Pressure Vessels & Storage Tanks
Architectural Structures
Precision Mechanical Engineering
Automotive Exhaust Components

Quality Inspection, Testing & Packaging

PMI Testing: Positive Material Identification to verify alloy composition compliance.

Ultrasonic Testing (UT): Internal flaw detection to ensure structural soundness.

Hydrostatic Testing: Pressure containment validation for leakage prevention.

Eddy Current Testing: Surface and near-surface defect inspection.

Dimensional Inspection: Precision verification of diameter, wall thickness, and length tolerances.

Surface Inspection: Visual and optical check for freedom from cracks, pits, and scaling.

Mechanical Testing: Tensile, yield, and elongation testing per batch specifications.

Export Packaging & Logistics

Plastic protective caps fitted on both tube ends to prevent internal contamination.

Secure bundling wrapped with heavy-duty PVC film or woven fabric bags.

Heavy-duty wooden crates or reinforced steel frames designed for rugged international transit.

Fully seaworthy export packaging tailored to withstand moisture, shock, and long-distance maritime shipping.

FAQ

Q: What is the difference between seamless and welded stainless steel tubes?

A: Seamless tubes are manufactured without any longitudinal welding seams, providing higher pressure resistance, better structural integrity, and improved reliability under intense stress compared to welded tubes.

Q: Can you provide customized dimensions and non-standard sizes?

A: Yes. We manufacture customized outer diameters, wall thicknesses, specific lengths, custom tolerances, and specialized surface finishes tailored precisely to project requirements.

Q: Which international manufacturing standards do your products follow?

A: Our products strictly comply with major international specifications, including ASTM, ASME, EN, DIN, JIS, and GB standards.

Q: What documentation and material test reports do you provide with shipments?

A: We supply comprehensive documentation including EN 10204 3.1 Material Test Certificates, PMI verification reports, hydrostatic test certificates, ultrasonic and eddy current inspection summaries, and dimensional audit reports.

Q: What surface finish options are available for selection?

A: Standard production includes AP (Annealed and Pickled), BA (Bright Annealed), mechanical polished finishes ranging from 180 to 600 grit, mirror finishes, and specialized hairline treatments.

Q: What is the standard minimum order quantity for custom production?

A: Our minimum order quantities are flexible depending on the specific grade, outer diameter, and wall thickness required. Contact our project team to discuss specific batch quantities.

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