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Marine Industry

Marine Industry

Stainless Steel Solutions for Marine Applications

The marine industry relies heavily on stainless steel flat and round products due to their exceptional corrosion resistance, strength, and durability in saltwater and high-moisture environments. From propulsion shafts and rudder assemblies to deck fittings and fasteners, stainless steel ensures long-term performance in harsh, demanding conditions.

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Common Marine Applications

Our materials are used in the production of critical marine components, including:
  • Propeller Shafts & Rudder Stocks – Boat Shaft Quality (BSQ) round bar for high-stress submerged components
  • Deck Hardware & Marine Fittings – Cleats, railings, brackets, hatches, bollards, and winch components
  • Fasteners & Connectors – Bolts, screws, washers, and pins exposed to saltwater and UV
  • Marine Structures – Bulkheads, frames, tanks, and hull reinforcements
  • Pumps, Valves & Piping – Fluid handling systems requiring chemical resistance and mechanical durability

Stainless Steel Grades for Marine Use

316 / 316L – Marine Grade Austenitic Stainless Steel

  • Contains molybdenum (2–3%) for enhanced pitting and crevice corrosion resistance
  • Ideal for saltwater exposure, offering superior durability and weldability
  • Commonly used for fittings, structural parts, tubing, and decking hardware

17-4 PH – Precipitation Hardening Stainless Steel

  • Combines high tensile strength with moderate corrosion resistance
  • Excellent for marine propulsion shafts and other high-load components
  • Good machinability and heat-treatable to various strength levels

Duplex Stainless Steel (e.g., 2205)

  • Offers twice the yield strength of 316L with improved resistance to stress corrosion cracking
  • Used in more extreme marine conditions: offshore platforms, propulsion systems, and seawater piping
  • Balanced composition of austenite and ferrite phases

Flat & Round Product Capabilities

Product TypeTypical Use in Marine ApplicationsAvailable Forms
Coil & StripHose clamps, brackets, shieldingSlit to width, paper interleaved, PVC protected
Sheet & PlateTank linings, support structures, bulkheads2B, No. 4, No. 8 finishes available
Round Bar (BSQ)Propeller shafts, rudder assembliesGround to precision tolerances, turned & polished
Custom Cut BlanksFlanges, base plates, fabricated assembliesCut-to-length available

Value-Added Services

  • Slitting, Edging & Cut-to-Length
  • PVC Protective Film (brands: Nitto, Novacel, Pregis)
  • Paper Interleaving for surface protection
  • Custom Tempers & Gauges
  • Polished & Bright Annealed Finishes
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Why Stainless Steel for Marine Environments?

  • Exceptional Corrosion Resistance – Even in seawater and brackish conditions
  • High Strength-to-Weight Ratio – Improves performance without added bulk
  • Low Maintenance & Long Service Life – Reduces total cost of ownership
  • Aesthetic Appeal – Clean, corrosion-free surfaces enhance visual quality

Serving the Marine Sector with Confidence

Whether you’re manufacturing offshore equipment, pleasure craft components, or commercial marine systems, stainless steel flat and round products from Source 21 are built to perform in the harshest conditions.

Contact us today to discuss material availability, grades, or processing options for your next marine application.

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Founded in 1990 Source 21 is a leading distributor and processor of stainless steel, copper and brass products.

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