A Comprehensive Guide to SS 316 Square Bars

Industrial and construction sectors demand materials that offer strength, durability, and corrosion resistance. Among these materials, SS 316 Square Bars stand out as a premium choice. Manufactured from stainless steel 316, these bars are highly valued for their ability to withstand aggressive environments, including exposure to chlorides, seawater, and industrial chemicals.

With their square cross-section, SS 316 Square Bars provide structural stability and are widely used in industries ranging from marine and petrochemical to food processing and construction. Their versatility, combined with exceptional resistance properties, makes them one of the most sought-after stainless steel products.

This blog provides a comprehensive guide to stainless steel 316 square bars—their composition, key properties, advantages, applications, standards, and buying tips.

Chemical Composition of SS 316 Square Bars

The performance of SS 316 Square Bars stems from their chemical composition. The presence of molybdenum in SS 316 improves resistance to pitting and crevice corrosion, especially in chloride environments.

Typical Composition (%):

• Chromium (Cr): 16–18%

• Nickel (Ni): 10–14%

• Molybdenum (Mo): 2–3%

• Carbon (C): ≤ 0.08%

• Manganese (Mn): ≤ 2%

• Silicon (Si): ≤ 0.75%

• Phosphorus (P): ≤ 0.045%

• Sulfur (S): ≤ 0.03%

• Iron (Fe): Balance

This well-balanced composition ensures the square bars are resistant, tough, and long-lasting.

Key Properties of SS 316 Square Bars

1. Mechanical Properties

• Tensile Strength: 515 MPa minimum

• Yield Strength: 205 MPa minimum

• Elongation: 40%

• Hardness: 217 Brinell max

2. Physical Properties

• Density: 8.0 g/cm³

• Melting Point: 1371–1399 °C

• Modulus of Elasticity: 193 GPa

• Thermal Conductivity: 16.3 W/m·K

3. Corrosion Resistance

• Strong resistance to acids, alkalis, and chloride-rich environments

• Performs well in marine and offshore conditions

• Resists stress corrosion cracking and pitting

4. Fabrication

• Excellent machinability with standard cutting tools

• Weldable by conventional processes

• Retains strength and toughness after welding

Advantages of SS 316 Square Bars

SS 316 Square Bars provide multiple benefits across industries:

1. Superior Corrosion Resistance – Performs exceptionally in chloride-heavy and seawater environments.

2. High Durability – Withstands long-term exposure without losing structural integrity.

3. Strength and Toughness – Capable of bearing heavy mechanical loads.

4. Heat Resistance – Remains stable in high-temperature environments.

5. Hygienic Properties – Non-reactive surface ideal for food and medical industries.

6. Versatility – Suitable for construction, chemical, automotive, and marine projects.

7. Aesthetic Appeal – Smooth finishes make it suitable for decorative applications.

Applications of SS 316 Square Bars

SS 316 Square Bars are valued for their versatility and reliability. They are used across multiple sectors, such as:

1. Construction Industry

• Reinforcement for high-rise structures

• Handrails, gates, and support systems

• Decorative architectural frameworks

2. Marine and Offshore Industry

• Shipbuilding and dock construction

• Marine fasteners and propeller shafts

• Offshore oil rigs and platforms

3. Chemical and Petrochemical Plants

• Storage tanks and pipelines

• Heat exchangers and pressure vessels

• Equipment exposed to harsh chemicals

4. Food and Beverage Industry

• Dairy and brewery equipment

• Food processing machinery

• Hygienic conveyor systems

5. Automotive and Aerospace Sector

• Shafts, fasteners, and components

• Exhaust systems and engine parts

• Aerospace fittings

6. Healthcare Industry

• Surgical equipment

• Orthopedic implants

• Medical machinery components

Manufacturing Process of SS 316 Square Bars

SS 316 Square Bars are manufactured using a precise process to maintain strength and consistency.

1. Raw Material Selection – High-quality stainless steel alloy is chosen.

2. Melting and Casting – Alloy melted in furnaces and cast into billets.

3. Hot Rolling – Billets rolled into square profiles at high temperatures.

4. Heat Treatment – Annealing improves corrosion resistance and mechanical properties.

5. Cold Finishing – Includes polishing and pickling for smooth surfaces.

6. Inspection and Testing – Rigorous quality checks ensure compliance.

7. Cutting and Packaging – Bars cut to desired lengths and securely packaged.

Surface Finishes Available

SS 316 Square Bars are supplied in multiple finishes:

• Bright Finish – Smooth, polished, reflective surface.

• Black Finish – As-rolled dark finish for industrial use.

• Pickled Finish – Acid-treated for enhanced resistance.

• Mirror Finish – Decorative, hygienic, highly reflective finish.

Standards and Specifications

SS 316 Square Bars are manufactured according to global quality standards:

• ASTM A276, ASTM A479

• ASME SA276, ASME SA479

• DIN 1.4401 / 1.4436

• JIS SUS 316

Size Range: 4 mm to 150 mm square, lengths up to 6 meters (custom available).

SS 316 vs SS 304 Square Bars

Factors to Consider When Buying

When purchasing SS 316 Square Bars, buyers should evaluate:

1. Dimensions and Tolerance – Ensure bars match required specifications.

2. Surface Finish – Select based on application.

3. Standards Compliance – Verify ASTM, ASME, or DIN certifications.

4. Supplier Reputation – Choose a trusted manufacturer and supplier.

5. Pricing – Compare per kg rates from multiple suppliers.

6. Test Certificates – Request MTC for quality assurance.

SS 316 Square Bar Price in India

The SS 316 Square Bar price depends on size, finish, and supplier. Average prices:

• Small sizes: ₹250 – ₹300 per kg

• Medium sizes: ₹280 – ₹350 per kg

• Large sizes: ₹300 – ₹400 per kg

Prices may vary based on raw material cost and order quantity. Always request a quotation for bulk requirements.

Maintenance Tips

To maximize the lifespan of SS 316 Square Bars:

• Regularly clean to prevent buildup of contaminants.

• Avoid prolonged exposure to unnecessary strong chemicals.

• Use passivation for extra protection in critical applications.

• Store in dry, clean conditions to prevent contamination.

Conclusion

SS 316 Square Bars are a versatile, strong, and corrosion-resistant material widely used across industries. Their ability to perform in chloride-rich and harsh chemical environments makes them far superior to many other stainless steel grades.