Bhansali Stainless

SS Black Round Bars refer to hot-rolled stainless steel bars that still have the black oxide scale (also called mill scale) left on their surface after processing. This black coating forms naturally during the hot rolling process due to oxidation at high temperatures.

They're typically not polished and have a rougher, matte surface compared to bright or peeled bars.

SS black bars are often used where appearance isn’t critical but strength and durability are:

• Structural components

• Shafts and supports

• Forging stock

• Heavy machinery

• Industrial equipment

• Base materials for further machining or pickling

Same grades as regular SS round bars, including:

• SS 304 Black Bar – General purpose, good corrosion resistance

• SS 316 Black Bar – Excellent for marine and chemical exposure

• SS 410 / 420 Black Bars – High strength, used in tool making

• SS 202 / 201 Black Bars – Cheaper, moderate corrosion resistance

• Diameter: 16mm to 300mm (can vary by supplier)

• Length: 3 meters, 6 meters standard – customizable

• Pickling & Passivation: Removes scale, improves corrosion resistance

• Grinding / Polishing: Improves appearance and tolerance

• Machining: Common for converting black bars into parts

A stainless steel round bar is a cylindrical bar made from stainless steel, available in various grades such as 304, 316, and 410. These bars are commonly used in machining, construction, and fabrication for a wide variety of applications due to their strength, durability, and corrosion resistance.

That's an excellent choice for a durable and highly corrosion-resistant material. Stainless Steel 316 (SS 316) round bar is an austenitic alloy, often referred to as "marine grade" stainless steel.

The superior performance of SS 316 compared to SS 304 comes primarily from the addition of Molybdenum (Mo).

• Molybdenum Content: SS 316 contains 2.0–3.0% Molybdenum, which is the key differentiator.

• Corrosion Resistance: This element drastically improves its resistance to pitting and crevice corrosion, especially in environments containing chlorides, such as saltwater or chemical processing media.

• Mechanical Strength: It offers slightly better tensile and creep strength at elevated temperatures than SS 304.

• Weldability: It has excellent weldability, but for heavy welded sections, the SS 316L (low-carbon) variant is preferred to minimize the risk of sensitization (intergranular corrosion).

That's a great choice of material! Stainless Steel 304L square bars are a widely used and versatile product.

The 'L' in 304L signifies a low-carbon version of the standard 304 stainless steel. This low carbon content is key because it minimizes harmful carbide precipitation during welding, making the material highly resistant to intergranular corrosion in the heat-affected zone of welds. This is especially important for heavy gauge welded components.

Here is a summary of the key properties, applications, and specifications for SS 304L square bars:

• Corrosion Resistance: Excellent general corrosion resistance, especially in atmospheric, chemical, and food processing environments. The low carbon content provides superior resistance after welding.

• Weldability: Outstanding weldability by all standard fusion methods. The "L" grade makes it the preferred choice for heavy gauge welding where post-weld annealing is not feasible.

• Formability: Excellent formability and can be deep drawn.

• Mechanical Properties: Good strength and toughness, including in cryogenic environments.

  • Minimum Tensile Strength: 485 MPa (70,000 psi)

  • Minimum Yield Strength (0.2% Offset): 170 MPa (25,000 psi)

  • Density: $8,000 \text{ kg/m}^3$ (or $0.289 \text{ lb/in}^3$)

SS 304L square bars are frequently used in:

• Construction & Architecture: Structural supports, frameworks, balustrades, and handrails for both aesthetic appeal and strength.

• Chemical & Petrochemical Industry: Components in chemical process equipment, tank trucks, and pipeline systems due to corrosion resistance.

• Food Processing & Equipment: Machinery frames, equipment supports, and fittings where hygiene and corrosion resistance from cleaning agents are crucial.

• Fabrication: Various fabricated assemblies requiring welding and forming.

• Marine Environments: Fittings and hardware that require good resistance to saltwater and atmospheric conditions.

SS 304L square bars are available in various dimensions, finishes, and standards:

That's an excellent choice for a durable and highly corrosion-resistant material. Stainless Steel 316 (SS 316) round bar is an austenitic alloy, often referred to as "marine grade" stainless steel.

The superior performance of SS 316 compared to SS 304 comes primarily from the addition of Molybdenum (Mo).

• Molybdenum Content: SS 316 contains 2.0–3.0% Molybdenum, which is the key differentiator.

• Corrosion Resistance: This element drastically improves its resistance to pitting and crevice corrosion, especially in environments containing chlorides, such as saltwater or chemical processing media.

• Mechanical Strength: It offers slightly better tensile and creep strength at elevated temperatures than SS 304.

• Weldability: It has excellent weldability, but for heavy welded sections, the SS 316L (low-carbon) variant is preferred to minimize the risk of sensitization (intergranular corrosion).