Stainless Steel 316 Round Bars

Stainless Steel 904L Round Bars Manufacturer, Supplier & Exporter in Mumbai, India

Stainless Steel 904L Round Bars Manufacturer, Supplier & Exporter in Mumbai, India

Virami Steel Hub is a leading manufacturer, supplier, stockist, and exporter of premium Stainless Steel 904L Round Bars in Mumbai, India. We supply SS 904L round bars across India and export globally to the USA, Canada, Europe, Russia, Middle East, Australia, and Southeast Asia. Our SS 904L round bars are manufactured under strict quality controls, ensuring exceptional corrosion resistance, superior mechanical properties, and reliable performance in aggressive environments.

SS 904L Round Bars are widely used in chemical processing, marine, pharmaceutical, and industrial applications due to their excellent corrosion resistance, high nickel content, and molybdenum alloying, making them suitable for highly corrosive and oxidizing environments.

Stainless Steel 316 Round Bars

What is Stainless Steel 904L Round Bar?

Stainless Steel 904L is an austenitic stainless steel alloy with high nickel, chromium, and molybdenum content, designed for high corrosion resistance in aggressive chemical environments. It is sometimes referred to as a super austenitic stainless steel due to its superior resistance to pitting, crevice corrosion, and stress corrosion cracking compared to conventional austenitic grades like 304 and 316.

Key characteristics of SS 904L:

  • High corrosion resistance, especially in chloride-rich and oxidizing environments
  • Superior resistance to pitting, crevice corrosion, and stress corrosion cracking
  • Excellent weldability and fabrication properties
  • Non-magnetic in annealed condition
  • Good mechanical strength and toughness

SS 904L Round Bars are used in chemical, pharmaceutical, marine, and industrial applications where corrosion resistance and durability are critical.


Key Features of SS 904L Round Bars

  • Exceptional corrosion resistance in acids, alkalis, and chloride environments
  • High resistance to pitting and crevice corrosion
  • Excellent mechanical properties, including tensile and yield strength
  • Non-magnetic in annealed condition
  • Weldable and formable for various fabrication needs
  • High dimensional stability
  • Excellent surface finish and aesthetic appeal

This combination makes SS 904L ideal for chemical processing equipment, marine applications, and pharmaceutical machinery.


Chemical Composition of Stainless Steel 904L Round Bars (%)

  • Chromium (Cr): 19 – 23
  • Nickel (Ni): 24 – 26
  • Molybdenum (Mo): 4 – 5
  • Copper (Cu): 1 – 2
  • Manganese (Mn): ≤ 2
  • Silicon (Si): ≤ 1
  • Carbon (C): ≤ 0.02
  • Phosphorus (P): ≤ 0.045
  • Sulfur (S): ≤ 0.03
  • Iron (Fe): Balance

Role of Alloying Elements

  • Chromium: Provides oxidation and general corrosion resistance
  • Nickel: Stabilizes austenitic structure and improves toughness
  • Molybdenum: Enhances resistance to pitting and crevice corrosion
  • Copper: Improves resistance to strong acids such as sulfuric acid
  • Carbon: Low carbon reduces carbide precipitation, ensuring maximum corrosion resistance

Mechanical Properties of SS 904L Round Bars

SS 904L is a high-performance austenitic stainless steel with excellent mechanical properties:

  • Tensile Strength: 520 – 700 MPa
  • Yield Strength (0.2% Offset): 215 – 275 MPa
  • Elongation: 35 – 45%
  • Hardness: 150 – 200 HB (Brinell)

These properties make 904L suitable for critical applications requiring both corrosion resistance and structural integrity.


Physical Properties of Stainless Steel 904L

  • Density: 8.0 g/cm³
  • Modulus of Elasticity: 193 – 200 GPa
  • Melting Range: 1390 – 1420°C
  • Thermal Conductivity: 2.5 W/m·K
  • Electrical Resistivity: 0.75 μΩ·m
  • Magnetic: Non-magnetic in annealed condition

The combination of high corrosion resistance, mechanical strength, and non-magnetic properties makes 904L round bars suitable for chemical, pharmaceutical, and marine applications.


Corrosion Resistance of SS 904L Round Bars

SS 904L provides:

  • Excellent resistance to strong oxidizing acids such as nitric and ferric acid
  • Superior resistance to reducing acids like hydrochloric and sulfuric acids
  • High resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-rich environments
  • Suitable for high-temperature acidic environments

SS 904L is commonly used in chemical reactors, heat exchangers, pumps, valves, and marine applications due to its superior corrosion resistance.


Heat Treatment of SS 904L

SS 904L is an austenitic stainless steel, and its properties are optimized by solution annealing:

Step 1: Solution Annealing

  • Heat to 1040 – 1120°C
  • Rapid water quenching

It is particularly useful in exhaust manifolds, furnace parts, and high-temperature process equipment.


Step 2: Stress Relief (Optional)

Heat to 400 – 600°C to relieve internal stresses

No precipitation hardening is required. Proper heat treatment ensures maximum corrosion resistance and mechanical performance.


Machinability of SS 904L Round Bars

Machining of 904L is challenging due to high work hardening:

  • Use carbide cutting tools for best results
  • Moderate cutting speeds and feeds recommended
  • Apply sufficient coolant to avoid overheating
  • Threaded components benefit from lubrication or anti-galling coatings

Machining in solution-annealed condition improves tool life and surface finish.


Weldability of Stainless Steel 904L Round Bars

SS 904L can be welded using standard austenitic stainless steel techniques:

  • TIG (GTAW), MIG (GMAW), and SMAW are suitable
  • Low carbon and high nickel content minimizes carbide precipitation
  • Post-weld stress relief recommended for thick sections
  • Compatible filler metals include ER904L or ER316L

Proper welding ensures retention of corrosion resistance and mechanical properties.


Available Sizes & Specifications

SS 904L Round Bars are supplied in:

Standards:

  • ASTM A276
  • ASTM A479
  • UNS N08904

Size Range:

  • Diameter: 6 mm to 300 mm
  • Length: 3 m, 6 m, or custom cut lengths
  • Tolerances: As per ASTM / UNS standards

Surface Finish:

  • Hot Rolled / Bright
  • Polished
  • Centerless Ground

Applications of Stainless Steel 904L Round Bars

Due to its high corrosion resistance and mechanical properties, SS 904L is widely used in:

Chemical & Petrochemical Industry

  • Chemical reactors
  • Heat exchangers
  • Pumps and valves
  • Pipes and fittings

Marine Applications

  • Seawater pumps and valves
  • Offshore platforms
  • Desalination plants

Pharmaceutical & Food Industry

  • Sterile process equipment
  • Fermenters and reactors
  • High-purity piping

Industrial & Heavy Machinery

  • Fasteners and screws for corrosive environments
  • Shafts and rods in chemical machinery
  • Bearings and bushings

Advantages of Stainless Steel 904L Round Bars

  • Superior corrosion resistance in acidic and chloride-rich environments
  • High tensile and yield strength
  • Excellent pitting and crevice corrosion resistance
  • Non-magnetic in annealed condition
  • Weldable, machinable, and fabricable
  • Long service life and low maintenance
  • Ideal for chemical, marine, and pharmaceutical applications

Mill Test Certificates (MTC) are provided as per ASTM / UNS standards. Third-party inspection is available on request.


Quality Testing & Inspection

All SS 904L Round Bars undergo:

  • Chemical composition verification
  • Mechanical property testing
  • Hardness testing
  • Dimensional inspection
  • Surface finish inspection

Mill Test Certificates (MTC) are provided as per ASTM / UNS standards. Third-party inspection is available on request.


Why Choose Virami Steel Hub for SS 904L Round Bars?

  • Trusted stainless steel manufacturer and supplier in Mumbai
  • High-performance chemical, marine, and pharmaceutical-grade materials
  • Competitive global pricing
  • Custom sizes, lengths, and heat treatment options
  • Certified quality assurance and MTC
  • Reliable global delivery
  • Expertise in high-performance industrial applications

Conclusion

Stainless Steel 904L Round Bars are high-performance austenitic stainless steel products offering superior corrosion resistance, mechanical strength, and durability in highly corrosive and chloride-rich environments. SS 904L is widely used in chemical processing, marine, pharmaceutical, and industrial applications.

Virami Steel Hub supplies premium-quality SS 904L Round Bars with certified testing, global delivery, and customizable sizes. Our products deliver reliability, long service life, and performance in the most demanding applications.

Products / Services