Alloy 20 Round Bars and Rods

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Alloy Steel 20 Explained

Alloy Steel 20 (also known as Alloy 20 / UNS N08020) is a high-performance corrosion-resistant alloy containing nickel, chromium, iron, copper, and molybdenum. To begin with, it is specifically designed to provide exceptional resistance to sulfuric acid and other aggressive chemical environments. Furthermore, it offers good resistance to pitting, crevice corrosion, and stress corrosion cracking — making it a trusted material for the most demanding chemical services.

Why do chemical engineers and plant managers choose Alloy 20 for critical process equipment? First and foremost, its unique copper-bearing composition delivers outstanding performance in sulfuric acid environments where standard stainless steels rapidly fail. In addition, it offers excellent fabricability and weldability, simplifying fabrication and reducing project timelines. Moreover, it maintains stable mechanical properties across a wide range of operating conditions — ensuring consistent, reliable performance over the long term.

Consequently, Alloy Steel 20 is widely used in chemical processing plants, petrochemical industries, and pharmaceutical equipment. Furthermore, it is also trusted in heat exchangers, storage tanks, and piping systems. Equally important, its combination of outstanding corrosion resistance, mechanical stability, and ease of fabrication makes it the preferred choice for applications where corrosion resistance and long service life are critical for safe and efficient operation.

Need premium Alloy Steel 20 round bars for your aggressive chemical environment? Contact our technical team today — we’ll help you select the right size and specifications for your requirements, and provide a competitive quote tailored to your needs.

Other Types of Alloy 20 Bars

Alloy 20 Square Bar
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Alloy 20 Square Bar
  • Square bars offering excellent resistance to chemical corrosion
  • Material grades include Alloy 20 / UNS N08020
  • Manufactured as per ASTM B473, DIN 2.4660, and ASME SB standards
  • Widely used in chemical processing and acid-handling equipment
Alloy 20 Hex Bar
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Alloy 20 Hex Bar
  • Hexagonal bars suitable for fasteners and bolting components
  • Produced to ASTM B473 and ASME SB473 specifications
  • Available in bright drawn and polished surface finishes
  • Used in pumps, valves, and corrosive service assemblies
Alloy 20 Rectangular Bar
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Alloy 20 Rectangular Bar
  • Rectangular bars designed for fabrication in corrosive environments
  • Complies with UNS N08020 and DIN 2.4660 standards
  • Maintains strength and corrosion resistance in acidic media
  • Used in tanks, frames, and chemical plant structures
Alloy 20 Flat Bar
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Alloy 20 Flat Bar
  • Flat bars engineered for high corrosion resistance
  • Manufactured under ASTM B473 and ASME SB473 norms
  • Available in hot rolled and polished conditions
  • Used in chemical equipment supports and structural parts
Alloy 20 Bright Bar
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Alloy 20 Bright Bar
  • Bright finished bars with precise dimensions and smooth surface
  • Ideal for CNC machining and precision components
  • Conforms to ASTM B473 Alloy 20 requirements
  • Used in shafts, valve parts, and precision fasteners
Alloy 20 Forged Bar
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Alloy 20 Forged Bar
  • Forged bars offering superior strength and corrosion resistance
  • Material: UNS N08020 Alloy 20
  • Suitable for high-integrity chemical processing components
  • Used in reactors, pressure vessels, and heavy-duty equipment

ALLOY 20 ROUND BAR EQUIVALENT GRADES

STANDARD UNS WNR. EN AFNOR
Alloy 20 N08020 2.4660 NiCr20CuMo Z2NCUD31-20AZ

SPECIFICATION OF ALLOY 20 ROUND BAR

Product Standard ASTM B473 / ASME SB473
Dimension Standard EN, DIN, JIS, ASTM, BS, ASME, AISI
Size 14 mm – 300 mm
Length 1 to 6 meters, Custom Cut Length
Form Round, Square, Hex (AF), Rectangle, Billet, Ingot, Forging

CHEMICAL COMPOSITION OF ALLOY 20 ROUND BAR

Grade C Mn Si S Cu Ni Cr Fe Mo P
Alloy 20 0.07 max 2.00 max 1.00 max 0.035 max 3.00 – 4.00 32.00 – 38.00 19.00 – 21.00 29.85 min* 2.00 – 3.00 0.045 max

MECHANICAL PROPERTIES OF ALLOY 20 ROUND BAR

Element Density Melting Point Tensile Strength Yield Strength (0.2% Offset) Elongation
Alloy 20 8.1 g/cm³ 1443 °C (2430 °F) 80,000 psi / 551 MPa 35,000 psi / 241 MPa 30%

💡 Practical Difference in Use

Use Alloy Steel 20 Round Bars when: excellent resistance to sulfuric acid, chlorides, and aggressive chemical environments is required along with good mechanical strength and long-term corrosion reliability. Alloy Steel 20 (UNS N08020) is a nickel–chromium–molybdenum alloy specifically engineered for chemical processing and corrosive service conditions. → Example: chemical processing equipment, acid handling systems, heat exchangers, reactors, storage tanks, and piping exposed to corrosive media.


Bright Finished / Machined Alloy Steel 20 Round Bars when: precise dimensional accuracy, smooth surface finish, and superior machinability are required for corrosion-critical components. Bright bars ensure uniform structure, tight tolerances, and consistent performance in demanding chemical environments. → Example: pump shafts, valve stems, fasteners, bolts, flanges, agitator shafts, and precision-machined chemical equipment parts.

Applications of Alloy Steel 20 Round Bars

Alloy Steel 20 round bars are widely used in industries where corrosion resistance and chemical stability are critical.

  • Chemical Processing Industry: Reactors, piping systems, storage tanks.
  • Petrochemical Industry: Heat exchangers, valves, acid service components.
  • Pharmaceutical & Food Processing: Hygienic and corrosion-resistant equipment.

When to Choose Alloy Steel 20 Round Bars?

Selection depends on corrosion severity, chemical exposure, temperature conditions, and the need for long-term reliability in aggressive environments.

Choose Alloy Steel 20 Round Bars when:

  • Severe sulfuric acid or chloride exposure is present
  • Excellent resistance to pitting and crevice corrosion is required
  • Stress corrosion cracking resistance is critical
  • Good mechanical strength with corrosion resistance is needed
  • Long service life in chemical environments is essential
  • Used in acid handling and chemical processing systems

Bright / Machined Alloy Steel 20 Round Bars are preferred when:

  • Tight dimensional tolerances are required
  • Smooth, clean, and defect-free surface finish is essential
  • Precision machining or threading is involved
  • Uniform corrosion resistance is critical
  • Used in pumps, valves, and fastener applications
  • Applied in corrosion-sensitive process equipment

Industries That Use Alloy Steel 20 Round Bars

Alloy Steel 20 is widely used across industries dealing with corrosive chemicals and aggressive operating conditions.

Chemical Processing Industry

Used in highly corrosive chemical environments.

Uses

Reactors, heat exchangers, acid piping.

Why Alloy Steel 20?

Exceptional resistance to sulfuric acid and corrosion.

Petrochemical & Oil Refining

Used in aggressive refinery process systems.

Uses

Valves, pumps, heat exchangers.

Why Alloy Steel 20?

Superior durability in acidic and chloride-rich environments.

Pharmaceutical & Food Processing

Used in hygienic and corrosion-resistant applications.

Uses

Mixers, shafts, fasteners.

Why Alloy Steel 20?

Cleanability, corrosion resistance, and long service life.

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Looking for high-quality Alloy 20 Round Bars & Rods? Our products are manufactured in compliance with ASTM B473 and ASME SB473 standards . Get in touch with us today.

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