316 Stainless Steel Pipe

316 stainless steel pipe complies with ASTM A312 and GB/T 14976 standards.

General-Purpose Molybdenum-Alloy Pipe, Ideal for Water Supply/Drainage in Coastal Areas, Chemical Tanker Piping, and Standard Chemical Transfer

  • Outstanding corrosion resistance

    In a 3.5% NaCl solution, the pitting potential ≥ +250mV, offering better crevice corrosion resistance than 304 stainless steel.

  • Stable mechanical properties

    Annealed tensile strength ≥ 520 MPa, elongation ≥ 40%.

  • Wide range of applications

    Suitable for industrial transport and structural use. Seamless pipes handle high pressure, while welded pipes offer economical solutions for large, low-pressure applications.

Product Specifications

Chemical Composition (GB/T 1220-2007)
Element C (Carbon) Si (Silicon) Mn (Manganese) P (Phosphorus) S (Sulfur) Cr (Chromium) Ni (Nickel) Mo (Molybdenum)
Content (%) ≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.030 16.0–18.0 10.0–14.0 2.0–3.0
Physical and Chemical Properties

Physical Properties

  • Density: 7.98 g/cm³
  • Melting Point: 1375–1450°C
  • Thermal Conductivity: 15.2 W/(m·K) at 20°C
  • Thermal Expansion Coefficient: 16.0×10⁻⁶/°C (0–100°C)
  • Magnetism: Non-magnetic in solution-annealed state; slight magnetism may occur after cold working

Mechanical Properties (Annealed Condition)

Property Value Test Standard
Tensile Strength ≥520 MPa GB/T 228.1-2021
Yield Strength ≥205 MPa GB/T 228.1-2021
Elongation ≥40% GB/T 228.1-2021
Brinell Hardness ≤187 HB GB/T 231.1-2009

Chemical Properties

Corrosion Resistance: Corrosion rate ≤0.01 mm/year in 65% nitric acid at 25°C; excellent resistance to seawater erosion, suitable for long-term marine use. Intergranular Corrosion Resistance: After sensitization at 650°C, no intergranular cracking observed in copper sulfate–sulfuric acid tests. The weld heat-affected zone maintains corrosion resistance.
Specifications and Supply Dimensions

Seamless Pipe Specifications

Type Outer Diameter (mm) Wall Thickness (mm) Tolerance Length (m)
Cold-drawn seamless pipe 6–219 1.0–20 OD ±0.1 mm, WT ±10% 3–6 (fixed length)
Hot-rolled seamless pipe 219–630 5.0–30 OD ±0.2 mm, WT ±12% 5–7 (random length)

Welded Pipe Specifications

Type Outer Diameter (mm) Wall Thickness (mm) Tolerance Length (m)
Straight seam welded pipe 19–1220 1.0–10 OD ±0.5 mm, WT ±15% 6 (fixed length)
Spiral welded pipe 219–2000 5.0–20 OD ±1.0 mm, WT ±12% 12 (fixed length)

Pricing Calculation

Workshop & Manufacturing Machine

Stainless Steel Plate Bending/Stamping Process

Stainless Steel Plates on Storage Rack

Palletized Stainless Steel Plates

Stainless Steel Plate Rolling Line

Precision Thickness Inspection of Stainless Steel Plate

Forklift Loading Stainless Steel Plates for Shipment

Product Applications

  • Marine Engineering

    Specification: Seamless Pipe Φ89×5 mm

    Description: Used in seawater pipelines at port terminals. The 316 seamless pipe provides excellent seawater corrosion resistance, operating for over 8 years without leakage—three times longer than 304.

  • Chemical Equipment

    Specification: Welded Pipe Φ219×8 mm

    Description: Installed in hydrochloric acid storage tank pipelines. The 316 welded pipe resists 30% HCl vapor and solves the corrosion issues that previously occurred in carbon steel pipes within three months.

  • Food & Pharmaceutical Industry

    Specification: Seamless Pipe Φ32×3 mm

    Description: Used in milk transfer lines at a dairy plant. Acid-pickled and passivated 316 seamless pipes meet FDA standards, ensuring hygiene, preventing contamination, and simplifying cleaning.

  • Architectural Decoration

    Specification: Polished Welded Pipe Φ50×2 mm

    Description: Applied in luxury hotel swimming pool handrails. HL-brushed 316 welded pipes maintain a bright appearance and resist chlorine-rich water corrosion, staying rust-free for over three years.

  • Power & Energy

    Specification: Seamless Pipe Φ159×10 mm

    Description: Used in desulfurization pipelines of thermal power plants. 316 seamless pipes resist sulfur-containing gas corrosion and deliver over twice the lifespan of 304 pipes.

FAQs

What is the difference between 304 and 316 stainless steel pipes?
316 contains 2–3% molybdenum, which significantly improves resistance to chloride corrosion and pitting, making it better suited for marine, chemical, and high-humidity environments.
Are both seamless and welded 316 stainless steel pipes available?
Yes. Seamless pipes are ideal for high-pressure or precision applications, while welded pipes offer a cost-effective solution for large-diameter or low-pressure systems.
What surface finishes can 316 stainless steel pipes be supplied in?
Common finishes include pickled, bright annealed, mirror polished, and HL brushed, depending on the end-use such as industrial, decorative, or sanitary applications.
How does 316 stainless steel perform in seawater and acid environments?
It offers excellent resistance to seawater corrosion and acidic media like nitric acid and hydrochloric vapor, far outperforming 304 stainless steel in durability.
What size range and tolerance are available for 316 stainless steel pipes?
Seamless pipes: 6–630 mm OD, 1.0–30 mm wall thickness; welded pipes: 19–2000 mm OD, 1.0–20 mm wall thickness. Tolerances follow ASTM A312 and GB/T 14976 standards.
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