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Quality Seamless Stainless Steel Square Tubing High Pressure High Temperature Grade factory
Quality Seamless Stainless Steel Square Tubing High Pressure High Temperature Grade factory

Seamless Stainless Steel Square Tubing High Pressure High Temperature Grade

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
Model Number: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
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Molybdenum Alloy Stainless Steel Pipe

Stainless Steel Pipe Chloride Resistance

Seamless Stainless Steel Square Tubing
Product Summary
Seamless stainless steel square tubing is a hollow structural section with four equal sides and no welded seam along its length. It is manufactured by extruding a solid billet of stainless steel into a hollow tube, then forming it into a square shape.The absence of a weld seam provides superior ...

Product Details

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Seamless Stainless Steel Square Tubing

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Stainless Steel Square Tubing High Pressure
Country Of Origin: MADE IN CHAINA
Brand: Baosteel，TISCO
Certifications: ISO/EN 10204 Type 3.1 / 3.2 Available
Grade: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH)
MOQ: 100kg
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
Product Description

Seamless stainless steel square tubing is a hollow structural section with four equal sides and no welded seam along its length. It is manufactured by extruding a solid billet of stainless steel into a hollow tube, then forming it into a square shape.
The absence of a weld seam provides superior strength, uniform wall thickness, and excellent performance under high pressure and extreme temperatures. Our seamless square tubing is ideal for critical applications where reliability is paramount.

Product Specifications
ParameterDetails
StandardASTM A312, A269, A213, EN 10216, JIS G3459
Grades304, 304L, 316, 316L, 321, 310S
Size (Width x Width)10 mm x 10 mm – 150 mm x 150 mm
Wall Thickness1.0 mm – 10.0 mm
Length3000 mm, 4000 mm, 6000 mm (custom cut available)
ProcessCold drawn or cold rolled seamless
Surface FinishMill finish, Pickled, Annealed, Polished
Chemical Composition (Reference %)
ElementGrade 304Grade 304LGrade 316Grade 316L
Carbon (C)≤ 0.08≤ 0.03≤ 0.08≤ 0.03
Silicon (Si)≤ 1.00≤ 1.00≤ 1.00≤ 1.00
Manganese (Mn)≤ 2.00≤ 2.00≤ 2.00≤ 2.00
Phosphorus (P)≤ 0.045≤ 0.045≤ 0.045≤ 0.045
Sulfur (S)≤ 0.030≤ 0.030≤ 0.030≤ 0.030
Chromium (Cr)18.0 – 20.018.0 – 20.016.0 – 18.016.0 – 18.0
Nickel (Ni)8.0 – 10.58.0 – 12.010.0 – 14.010.0 – 14.0
Molybdenum (Mo)——2.0 – 3.02.0 – 3.0
Mechanical Properties
GradeTensile Strength (MPa)Yield Strength (MPa)Elongation (%)
304≥ 515≥ 205≥ 35
304L≥ 485≥ 170≥ 35
316≥ 515≥ 205≥ 35
316L≥ 485≥ 170≥ 35

Note: The values above are for reference only. Please refer to the mill test certificate for actual data.

Key Features
  • No welded seam – eliminates weak points
  • Uniform wall thickness throughout
  • Superior pressure and temperature resistance
  • Excellent corrosion resistance
  • Higher strength than welded tubing
  • Smooth internal surface for fluid flow
Seamless vs. Welded Comparison
FeatureSeamless TubeWelded Tube
ManufacturingExtruded from solid billetFormed from strip and welded
Weld SeamNonePresent
Pressure RatingHigherLower
Wall Thickness ConsistencyVery consistentConsistent
StrengthSuperiorGood
Corrosion Resistance at SeamUniformPotential weak point
CostHigherLower
Lead TimeLongerShorter
Best ForHigh pressure, high temperature, critical applicationsStructural, architectural, general purpose
Applications

Seamless stainless steel square tubing is used in demanding applications where reliability is critical:

Oil & Gas
  • Instrumentation tubing
  • Hydraulic lines
  • Downhole equipment
  • Refinery components
Chemical & Petrochemical
  • High pressure processing lines
  • Heat exchanger tubing
  • Reactor components
  • Corrosive fluid handling
Power Generation
  • Boiler tubing
  • Nuclear power components
  • Steam lines
  • Heat recovery systems
Aerospace & Defense
  • Aircraft hydraulic systems
  • Structural components
  • Fuel lines
  • Missile guidance systems
Pharmaceutical & Food
  • Sanitary processing lines
  • High purity fluid transfer
  • Clean steam lines
  • Biopharmaceutical equipment
Grade Selection Guide
GradeBest For
304General high pressure applications, food processing
304LWelded structures in high pressure systems
316Marine, chemical, and chloride environments
316LWelded structures in corrosive environments
321High temperature applications (up to 900°C)
310SVery high temperature applications (up to 1150°C)
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