316 ss tube
316 ss tube
316 ss tube
316 ss tube
316 ss tube
316 ss tube
316-tube (6)
316 ss tube
316 ss tube
316 ss tube
316 ss tube
316 ss tube

316 Stainless Steel Pipe/Tube

316 Stainless Steel is an austenitic chromium-nickel alloy enhanced with 2-3% molybdenum for superior corrosion resistance. Known for excellent toughness, weldability, and formability, it maintains strength at high/low temperatures. Pipes/tubes come in seamless (high-pressure applications) and welded (cost-effective) variants.
    • Standards: ASTM A312, ASTM A213, ASTM A269, ASTM A249
    • Outer Diameter Range: 6mm – 100mm
    • Wall Thickness Range: 1mm – 12mm
    • Length: 6m standard (custom lengths available)
    • Surface Finish: Annealed & pickled, polished, mill finish
    • Certificated：ISO9001:2015, CE, ROHS

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Description

What is the 316 Stainless Steel Pipe/Tube?

316 stainless steel pipe and tube are high-performance austenitic stainless steel products containing molybdenum, which improves corrosion resistance, especially against chlorides and other industrial chemicals. Known for its excellent strength, formability, and weldability, 316 stainless steel is widely used in demanding environments such as marine, pharmaceutical, and chemical processing industries.

Available in seamless, welded, and precision finishes, 316 stainless steel pipes and tubes meet ASTM and other international standards, ensuring durability, hygiene, and reliable performance under harsh conditions.

Technical Parameters of 316 Stainless Steel Pipe

Parameter Value/Standard
Material Grade 316 / 316L
Standards ASTM A312, ASTM A213, ASTM A269, ASTM A249
Outer Diameter Range 6mm – 630mm
Wall Thickness Range 0.5mm – 30mm
Length 6m standard (custom lengths available)
Surface Finish Annealed & pickled, polished, mill finish
Manufacturing Type Seamless / Welded
Tensile Strength ≥ 515 MPa
Yield Strength ≥ 205 MPa
Elongation ≥ 40%
Hardness (Brinell) ≤ 217 HB
Operating Temperature Up to 870°C (intermittent), 925°C (continuous)

Chemical Composition of 316/316L Stainless Steel (ASTM A312/A213/A269)

Element 316 (%) 316L (%)
Carbon (C) ≤ 0.08 ≤ 0.03
Chromium (Cr) 16.0 – 18.0 16.0 – 18.0
Nickel (Ni) 10.0 – 14.0 10.0 – 14.0
Molybdenum (Mo) 2.0 – 3.0 2.0 – 3.0
Manganese (Mn) ≤ 2.0 ≤ 2.0
Silicon (Si) ≤ 1.0 ≤ 1.0
Phosphorus (P) ≤ 0.045 ≤ 0.045
Sulfur (S) ≤ 0.03 ≤ 0.03
Nitrogen (N) ≤ 0.10 ≤ 0.10

Mechanical Properties of 316/316L Stainless Steel (ASTM A312/A213/A269)

Property 316 316L
Tensile Strength (MPa) ≥ 515 ≥ 485
Yield Strength (0.2% Offset, MPa) ≥ 205 ≥ 170
Elongation (% in 50mm) ≥ 35 ≥ 40
Hardness (HRB) ≤ 95 ≤ 95
Hardness (HV) ≤ 217 ≤ 217

Physical Properties of 316/316L Stainless Steel

Property Value
Density (kg/m³) 8000
Melting Point (°C) 1375 – 1400
Electrical Resistivity (µΩ·m at 20°C) 0.74
Thermal Conductivity (W/m·K at 20°C) 16.2
Specific Heat (J/kg·K) 500
Coefficient of Thermal Expansion ( at 20-100°C) 15.9

Advantages of 316 SS Pipes/Tubes

  1. Corrosion Resistance: Excels in chloride/saline environments (marine, chemical)
  2. High-Temp Stability: Performs well up to 870°C (1600°F)
  3. Hygienic Surface: Easy to clean; ideal for food/pharma
  4. Formability: Easily welded, bent, and fabricated
  5. Non-Magnetic: Annealed state (cold working adds slight magnetism)
  6. Eco-Friendly: 100% recyclable

Applications of 316 Stainless Steel Tube

316 Stainless Steel Pipe/Tube is used in a wide range of industries due to its excellent properties. Common applications include:

  • Chemical and Petrochemical Industry: Transporting corrosive chemicals and fluids.
  • Marine and Coastal Environments: Resisting the corrosive effects of seawater and salt spray.
  • Food and Beverage Processing: Pipes for milk, juice, beer, and other food products due to its hygienic properties.
  • Pharmaceutical and Medical: Tubing for pharmaceutical production and medical devices.
  • Pulp and Paper Industry: Resisting acidic bleaching solutions.
  • Oil and Gas: Downhole tubing and processing lines.
  • Architectural and Decorative: Handrails, structural support, and decorative elements in coastal areas.
  • Heat Exchangers: Tubing for heat exchangers and condensers.

aluminum sheet application

Comparison of Stainless Steel Pipe/Tube Grades

316 vs. 304 Stainless Steel

Property 316 304
Molybdenum 2–3% None
Corrosion Resistance Superior (chlorides) Moderate
Cost ~20–30% Higher Lower
High-Temp Strength Better Good
Marine Suitability Excellent Limited

316 vs. 316L Stainless Steel

Property 316 316L
Carbon Content ≤0.08% ≤0.03%
Weldability Good Excellent (less carbide precipitation)
Post-Weld Corrosion Possible in HAZ Minimal
Strength Slightly Higher Slightly Lower
Applications General Welded/corrosive environments

Seamless vs. Welded Stainless Steel Pipe/Tube

Feature Seamless Pipe/Tube Welded Pipe/Tube
Manufacturing Process Extruded or drawn from a solid billet, with no seam. Formed from a strip of stainless steel that is rolled and welded along the seam.
Strength & Integrity Higher burst pressure and mechanical strength. Uniform wall thickness. May have a weaker weld seam, but modern welding techniques have improved this.
Cost More expensive due to the complex manufacturing process. Less expensive, as the manufacturing process is more straightforward.
Surface Finish Smooth and consistent, both inside and outside. May have a visible weld bead or a slightly different surface finish at the seam.
Applications High-pressure applications, critical service lines, and environments with high stress. General industrial use, structural applications, and low to medium pressure lines.
Availability Less readily available in a wide range of sizes. Highly available in a vast range of sizes and wall thicknesses.

How to Choose the Right Stainless Steel Pipe/Tube Grade

Selecting the right stainless steel grade depends on your application’s specific requirements. Here are the key factors to consider:

✅ Corrosion Resistance

  • For general indoor use, 304 is usually sufficient.

  • For environments with chlorides (e.g., seawater, salt spray), 316 is better due to its molybdenum content, which resists pitting and crevice corrosion.

  • For high-temperature oxidation resistance, 310S is a preferred choice.

✅ Operating Temperature

  • 304 and 316 perform well up to 870–925°C.

  • If your process involves temperatures above 1000°C, consider 310S.

✅ Strength Requirements

  • All three grades offer good tensile and yield strength, but you should verify the mechanical specifications against your pressure or structural needs.

✅ Weldability & Fabrication

  • All grades (304, 316, 310S) have excellent weldability.

  • Choose low-carbon versions (like 316L) if welding without post-weld heat treatment to avoid sensitization.

✅ Budget

  • 304 is more economical for standard uses.

  • 316 is a bit more costly but worth it for superior corrosion resistance.

  • 310S is higher cost but suitable for extreme heat.

✅ Industry Standards

  • Always ensure the chosen grade meets relevant ASTM or EN standards for your project.

Simple Grade Selection Tips

  • Indoor or decorative use? → 304

  • Marine or chemical environment? → 316

  • High-temperature industrial furnace? → 310S

  • Frequent welding? → Choose low-carbon variants like 316L

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