Stainless Steel 316

Stainless Steel 316 (UNS S31600 / EN 1.4401) – Specifications, Properties and Applications

Stainless Steel 316 (UNS S31600 / EN 1.4401) is a molybdenum-bearing austenitic stainless steel renowned for its outstanding corrosion resistance, excellent mechanical properties, and superior performance in chloride-containing environments. Compared to Stainless Steel 304, Grade 316 provides significantly improved resistance to pitting, crevice corrosion, and chemical attack, making it one of the most widely used stainless steel grades for demanding industrial applications.

The addition of 2–3% molybdenum enhances resistance to aggressive chemicals, seawater, and marine atmospheres while maintaining excellent weldability, formability, and toughness. Stainless Steel 316 is extensively used in chemical processing, petrochemical plants, pharmaceutical manufacturing, food processing, marine engineering, water treatment facilities, and power generation industries.

Emirerri Steel supplies Stainless Steel 316 in sheets, plates, coils, pipes, tubes, round bars, flanges, and pipe fittings to customers across Tunisia, Algeria, Morocco, Libya, and international markets.

Key Features 

• Excellent corrosion resistance
• Superior resistance to chloride environments
• Excellent pitting and crevice corrosion resistance
• Molybdenum-enhanced chemical resistance
• Excellent weldability
• Good formability and machinability
• High mechanical strength
• Excellent toughness at low temperatures
• Good oxidation resistance
• Long service life with low maintenance

Specifications

Equivalent Grades 

Available Sizes

Plates

• Thickness: 5 mm to 100 mm

• Width: 1000 mm to 2500 mm

• Length: Up to 12000 mm

Sheets

• Thickness: 0.5 mm to 6 mm

• Width: Up to 2000 mm

Pipes & Tubes

• Outside Diameter: 6 mm to 610 mm

• Wall Thickness: 0.5 mm to 40 mm

Round Bars

• Diameter: 6 mm to 500 mm

Chemical Composition of Stainless Steel 316

Mechanical Properties of Stainless Steel 316

Physical Properties of Stainless Steel 316

Types of Stainless Steel 316 Products

Stainless Steel 316 Plates

Ideal for pressure vessels, storage tanks, chemical processing equipment, and structural applications.

Stainless Steel 316 Sheets

Widely used in food processing equipment, pharmaceutical machinery, kitchen equipment, and architectural applications.

Stainless Steel 316 Pipes

Designed for petrochemical plants, marine piping, chemical transport systems, and process industries.

Stainless Steel 316 Tubes

Suitable for heat exchangers, condensers, instrumentation tubing, and fluid handling systems.

Stainless Steel 316 Round Bars

Used in shafts, fasteners, valves, pumps, machined components, and industrial machinery.

Stainless Steel 316 Flanges & Pipe Fittings

Manufactured for industrial piping systems used in chemical, marine, pharmaceutical, and power generation industries.

Corrosion Resistance

Stainless Steel 316 provides outstanding resistance to:

• General corrosion

• Pitting corrosion

• Crevice corrosion

• Chloride-containing environments

• Marine atmospheres

• Organic and inorganic chemicals

• Industrial process fluids

The addition of molybdenum significantly improves corrosion resistance compared to Grade 304, making Stainless Steel 316 the preferred choice for marine, coastal, and aggressive chemical environments.

Heat Resistance

Stainless Steel 316 offers excellent resistance to oxidation and maintains good mechanical properties at elevated temperatures.

Service Temperature

• Continuous Service: Up to approximately 870°C
• Intermittent Service: Up to approximately 925°C

Benefits

• Good oxidation resistance
• Stable mechanical properties
• Reliable thermal performance
• Excellent toughness over a wide temperature range

Heat Treatment

Solution Annealing

• Temperature: 1010°C – 1120°C
• Cooling: Rapid water quenching or air cooling

Benefits

• Restores corrosion resistance
• Improves ductility
• Relieves internal stresses
• Optimizes mechanical performance

Stainless Steel 316 cannot be hardened by heat treatment but can be strengthened through cold working.

Welding 

Grade 316 has excellent weldability using all conventional welding methods.

Recommended Welding Methods

• GTAW (TIG)

• GMAW (MIG)

• SMAW (Shielded Metal Arc Welding)

• SAW (Submerged Arc Welding)

• Resistance Welding

Welding Advantages

• Excellent weld quality

• No preheating normally required

• High post-weld strength

• Excellent corrosion resistance after proper finishing

For heavy welded fabrications, Stainless Steel 316L is generally preferred because its lower carbon content minimizes the risk of intergranular corrosion.

Fabrication

Machining

• Turning

• Milling

• Drilling

• Threading

Forming

• Cold bending

• Roll forming

• Press forming

• Deep drawing

Cutting

• Laser cutting

• Plasma cutting

• Waterjet cutting

• Mechanical sawing

Surface Finishing

• Pickling

• Passivation

• Mechanical polishing

• Electropolishing

Applications 

Marine Industry

• Offshore structures

• Shipbuilding components

• Marine piping systems

Chemical Processing

• Reactors

• Storage tanks

• Process piping

• Pressure vessels

Petrochemical Industry

• Refineries

• Heat exchangers

• Chemical transport systems

Pharmaceutical Industry

• Processing equipment

• Hygienic vessels

• Production facilities

Food & Beverage Industry

• Food processing equipment

• Dairy equipment

• Brewery systems

• Hygienic piping

Water Treatment

• Desalination plants
• Water treatment systems
• Filtration equipment

Conclusion

Stainless Steel 316 (UNS S31600 / EN 1.4401) is a premium molybdenum-bearing austenitic stainless steel offering exceptional corrosion resistance, excellent mechanical strength, and superior durability in chloride-rich and chemically aggressive environments. Its outstanding weldability, formability, and long-term reliability make it the preferred material for marine engineering, chemical processing, petrochemical plants, pharmaceutical manufacturing, food processing, water treatment, and power generation industries. Available in sheets, plates, pipes, tubes, bars, flanges, and fittings, Stainless Steel 316 delivers dependable performance for the most demanding industrial applications worldwide.