Kanakratna Steelage Private Limited

 Introduction

In highly corrosive industrial environments, material selection is a crucial factor for ensuring long-term performance, safety, and cost-effectiveness. Alloy 20 (UNS N08020), also known as Carpenter 20, is a nickel-iron-chromium austenitic alloy developed specifically for superior resistance to sulfuric acid and other aggressive chemical environments.

When processed into round bars, Alloy 20 becomes a versatile form widely used in machining, manufacturing components, fasteners, shafts, valves, pumps, fittings, and structural parts across multiple industries.

With its excellent corrosion resistance, mechanical strength, and ease of fabrication, Alloy 20 round bar is often considered an economical alternative to higher-cost nickel alloys like Inconel or Hastelloy, especially in applications involving sulfuric acid, phosphoric acid, and chloride-rich conditions.

This article provides a comprehensive overview of Alloy 20 Round Bar (UNS N08020), covering composition, properties, types, manufacturing, standards, mechanical and corrosion behavior, applications, advantages, challenges, and future prospects.

 Chemical Composition (Typical % by weight)

 

• Nickel (Ni): 32 – 38%

• Iron (Fe): Balance

• Chromium (Cr): 19 – 21%

• Copper (Cu): 3 – 4%

• Molybdenum (Mo): 2 – 3%

• Manganese (Mn): ≤ 2%

• Silicon (Si): ≤ 1%

• Carbon (C): ≤ 0.07%

• Niobium + Tantalum (Nb+Ta): 0.1 – 1%

• Phosphorus (P): ≤ 0.045%

• Sulfur (S): ≤ 0.035%

Mechanical Properties of Alloy 20 Round Bar Types of Alloy 20 Round Bars

• Hot Rolled Round Bars – Stronger, rough finish.

• Cold Drawn Round Bars – Superior surface finish, precise tolerance.

• Peeled/Turned Bars – Machined for improved dimensional accuracy.

• Bright Bars – Polished finish for precision applications.

• Forged Round Bars – High strength, custom shapes.

 

Additional Information:

• Item Code: UNSN08020
• Production Capacity: 10 Tons Per Size
• Delivery Time: Ready Stock
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

Introduction

Alloy 20 Sheets (UNS N08020 / W.Nr. 2.4660), also known as Carpenter 20 or Incoloy 20, are nickel–iron–chromium austenitic alloy sheets with additions of copper and molybdenum. This alloy is specially engineered to resist sulfuric acid corrosion and is one of the most reliable materials for chemical processing, pharmaceutical, food, and petrochemical industries.

Sheets made from Alloy 20 combine:

• Excellent corrosion resistance in sulfuric acid, phosphoric acid, and chloride environments.

• High mechanical strength and durability.

• Good weldability and fabrication properties.

 

Alloy 20 sheets are often chosen over conventional stainless steels like 304 and 316 due to their superior resistance to acidic environments. They are also a cost-effective alternative to high-nickel alloys such as Hastelloy C276 or Inconel 625.

 Chemical Composition of Alloy 20 Sheets

The unique corrosion resistance of Alloy 20 comes from its balanced alloying elements:

 

 Mechanical Properties of Alloy 20 Sheets

Alloy 20 offers high strength and toughness while retaining good ductility.

 Physical Properties

• Density: 8.08 g/cm³

• Melting Range: 1357 – 1430 °C

• Thermal Conductivity (20°C): 10.4 W/m·K

• Electrical Resistivity (20°C): 0.99 µΩ·m

• Coefficient of Expansion (20–100°C): 15.0 µm/m·K

• Modulus of Elasticity: 195 GPa

Testing & Quality Control

Alloy 20 sheets undergo rigorous testing:

• Chemical Composition Analysis (Spectroscopy)

• Mechanical Testing (Tensile, Hardness, Impact)

• Corrosion Testing (ASTM G28 – Sulfuric Acid Test)

• Non-Destructive Testing (Ultrasonic, Eddy Current, Radiography)

• Microstructure Examination – confirms austenitic structure with stabilizers.

• Dimensional & Surface Finish Inspection

Additional Information:

• Production Capacity: 10 tons
• Delivery Time: Ready STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes