Alloy 20 Fasteners

Alloy 20 Fasteners are high-performance corrosion-resistant fasteners engineered specifically for use in aggressive chemical environments, particularly those involving acids such as sulfuric, phosphoric, and nitric acid. Known as a “super austenitic” nickel-iron-chromium alloy, Alloy 20 (UNS N08020 / Carpenter 20) offers an excellent balance of corrosion resistance, mechanical strength, and cost efficiency for demanding industrial applications.

At The Industrial Mandate, we supply a complete range of Alloy 20 fasteners including bolts, nuts, socket screws, washers, threaded rods, and custom machined components designed for critical service conditions in chemical and process industries.

What are Alloy 20 Fasteners?

Alloy 20 fasteners are manufactured from a nickel-iron-chromium alloy with additions of copper and molybdenum, designed to resist corrosion in highly acidic and chloride-containing environments.

This material was developed primarily for sulfuric acid service but also performs well in a variety of chemical media including phosphoric and nitric acid systems.

Alloy 20 fasteners are widely used where standard stainless steels such as 316 are not sufficient, but full high-cost nickel alloys like Hastelloy may not be required.

Key Properties of Alloy 20 Fasteners

Excellent Acid Resistance

Alloy 20 is specifically engineered for superior resistance to sulfuric acid and performs well in a range of acidic environments, making it a preferred material in chemical processing industries.

Resistance to Corrosion Types

These fasteners offer strong resistance to:

  • Pitting corrosion
  • Crevice corrosion
  • Chloride stress corrosion cracking
  • General chemical attack

Good Mechanical Strength

Alloy 20 fasteners provide reliable tensile and yield strength suitable for medium to heavy-duty industrial applications.

Good Fabricability and Weldability

The alloy is designed for ease of fabrication, making it suitable for machining into bolts, nuts, and precision components used in complex assemblies.

Cost-Effective High Performance

Alloy 20 is often selected as a mid-range solution between stainless steels and high-end nickel alloys, offering strong performance at a more economical cost.

Types of Alloy 20 Fasteners

We supply a wide range of Alloy 20 fastening solutions including:

  • Alloy 20 Bolts
  • Alloy 20 Nuts
  • Alloy 20 Socket Head Cap Screws
  • Alloy 20 Washers
  • Alloy 20 Stud Bolts
  • Alloy 20 Threaded Rods
  • Alloy 20 Machine Screws
  • Custom Alloy 20 Machined Fasteners

Available in metric and imperial sizes with multiple thread configurations.

Applications of Alloy 20 Fasteners

Alloy 20 fasteners are widely used across industries where chemical resistance is critical:

  • Chemical processing plants
  • Sulfuric acid production systems
  • Pharmaceutical manufacturing
  • Food processing equipment
  • Petrochemical and refinery systems
  • Heat exchangers and tanks
  • Desulphurisation systems
  • Pump and valve assemblies

Their resistance to acid attack makes them particularly valuable in aggressive process environments.

Why Choose The Industrial Mandate for Alloy 20 Fasteners?

  • Wide range of Alloy 20 fastener types and sizes
  • Manufactured to international ASTM and ASME standards
  • Excellent resistance to acid and chemical environments
  • Reliable performance in mid-to-severe corrosion applications
  • Metric and imperial availability
  • Global supply capability for industrial projects

At The Industrial Mandate, our Alloy 20 fasteners are engineered for durability, chemical resistance, and dependable long-term performance in demanding industrial environments.