ASTM B729 Alloy 20 Tubes Manufacturers & Supplier

Alloy 20 Tubes Manufacturer & Supplier

Alloy 20, also known as Carpenter 20, is a highly specialized austenitic stainless steel alloy engineered for use in environments exposed to sulfuric acid. Its exceptional corrosion resistance makes it a preferred material in industries requiring protection against aggressive chemical media. With superior resistance to chloride-induced pitting and crevice corrosion, Alloy 20 outperforms many conventional stainless steel grades. The presence of copper in its composition enhances its stability in sulfuric acid environments, making it a reliable solution for applications where stress corrosion cracking is a concern.

Thanks to these advanced properties, Alloy 20 tubes are widely recommended for critical process piping, chemical transport, and heat exchanger systems in industries such as chemical processing, pharmaceuticals, food and beverage, and power generation.

At Solitaire Overseas, we bring years of technical expertise and supply chain reliability as a trusted manufacturer, stockist, and global supplier of Alloy 20 tubes.

Each Alloy 20 tube we supply undergoes rigorous quality checks to ensure optimal performance in demanding industrial settings. With a commitment to engineering excellence, material expertise, and customer trust, Solitaire Overseas continues to be a preferred choice for clients seeking durable, corrosion-resistant tubing solutions.

Alloy 20 Tubes & Tubing – Certified Grades and Global Supply

At Solitaire Overseas, we are proud to offer a comprehensive selection of Alloy 20 Tubes that meet global quality benchmarks such as ASTM B729 and ASME SB729. Known for their exceptional resistance to corrosion in highly aggressive environments, these tubes are ideal for industries like chemical processing, pharmaceuticals, food production, and marine engineering. We supply both seamless and welded variants of Alloy 20 tubing in various specifications, including ASME SB729 Alloy 20 Welded Tubes, UNS N08020 ERW Tubes, Alloy 20Cb-3® Seamless and Welded Tubes, INCOLOY® Alloy 20 Seamless Tubing, and WNR 2.4660 Tubes in round and square forms. Each tube is engineered to offer high tensile strength, superior weldability, and long-term resistance to sulfuric acid and chloride-induced corrosion.

As a leading N08020 tubing supplier based in Mumbai, India, we are known for our precision-driven manufacturing practices, rigorous quality inspections, and reliable global delivery capabilities. We provide key specifications including INCOLOY® Alloy 20 / Alloy 20Cb-3®, UNS N08020 / WNR 2.4660, and both seamless, welded, and ERW tubing options. With extensive metallurgical expertise and adherence to international standards, Solitaire Overseas ensures full material traceability, third-party inspection certifications, and competitive pricing—making us a trusted name in the global Alloy 20 tubing market.

At Solitaire Overseas, we are dedicated to providing premium-grade Alloy 20 Tubes that meet the highest international quality standards. Our tubes are available in a wide range of specifications—varying in sizes, wall thicknesses, schedules, and types—to cater to the unique needs of various industrial applications. We also offer fully customized solutions tailored to client requirements, ensuring complete satisfaction for customers across both domestic and global markets. Our commitment to excellence starts with sourcing raw materials from certified and reputable vendors. Each batch of Alloy 20 is thoroughly tested before fabrication, and the production process is carried out using state-of-the-art technology, CNC-equipped machinery, and advanced tools. Every stage of manufacturing is supervised by skilled professionals and metallurgical experts, supported by a robust quality control team to maintain strict adherence to technical standards and product consistency.

To guarantee the long-term performance of our Alloy 20 Tubes in demanding environments, we carry out an extensive range of destructive and non-destructive tests. These include intergranular corrosion testing, positive material identification (PMI), tensile and hardness testing, pitting resistance evaluations, chemical and mechanical property checks, and macro/microstructural examinations. This rigorous testing process ensures each tube meets the critical requirements of sectors such as chemical processing, petrochemicals, food manufacturing, and pharmaceuticals. Our packaging methods also reflect our focus on quality and safety. Tubes are securely wrapped in eco-friendly poly covers and packed in durable wooden crates or pallets to prevent transit damage and maintain product integrity. With a strong emphasis on reliability, timely delivery, and technical precision, Solitaire Overseas has established itself as a globally trusted supplier and manufacturer of Alloy 20 Tubes.

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Specification

Specifications

ASTM B729 / ASME SB729

Dimensions

ASTM, ASME and API

Seamless Tube Size

1/2" OD - 12" OD

Welded Tubes Range

1/2" OD - 12" OD, Guage: 25 SWG - 10 SWG

Outside Diameter :

.00 mm OD up to 914.4 mm OD

Length :

Single Random, Double Random & Required Length

Thickness

0.3mm – 50 mm

Schedule

SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH120, SCH140, SCH160, XXS

Type

Seamless, Welded, ERW

Form

Round Tubes, Square Tubes, Rectangular Tube

Alloy 20 Tubes Equivalent Grades

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

Alloy 20 Tubes Chemical Composition

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

Alloy 20 Tubes Mechanical & Physical Properties

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

Alloy 20 Tube Application

Alloy 20 Tubes in various Application Industries

Food Processing Industry

Fabrication Industry

Oil and Gas Industry

Chemical Industry

Plumbing

General Purpose Applications

Heating

Water Supply Systems

Power Plant

Paper & Pulp Industry

Why Choose Solitaire Overseas For Alloy 20 Tubes

Solitaire Overseas stands out as a trusted and experienced manufacturer and global supplier of Alloy 20 Tubes, delivering unmatched quality, technical reliability, and customer satisfaction. With years of expertise in supplying corrosion-resistant tubing solutions, we understand the critical requirements of industries operating in harsh chemical environments. Our Alloy 20 tubes are engineered to perform under extreme conditions, offering superior resistance to sulfuric acid, chlorides, and stress corrosion cracking—making them ideal for use in chemical processing, pharmaceuticals, food manufacturing, and marine applications.

What sets us apart is our commitment to precision manufacturing, certified material sourcing, and thorough quality testing. We follow globally recognized standards such as ASTM B729 and ASME SB729, ensuring that every tube meets strict performance and durability benchmarks. From seamless to welded forms, we offer complete customization in sizes, thicknesses, and schedules to meet specific project needs. Our in-house metallurgical experts and quality control professionals monitor every stage of production, and all products undergo comprehensive testing—including PMI, IGC, tensile, and pitting resistance tests. Backed by on-time delivery, robust packaging, and transparent documentation, Solitaire Overseas remains a preferred choice for clients worldwide seeking dependable Alloy 20 tubing solutions.

FAQ For Alloy 20 Tubes

What is Alloy 20 material grade?

Alloy 20 is a nickel-iron-chromium austenitic alloy developed for superior corrosion resistance in sulfuric acid and other aggressive environments. It is designated as UNS N08020 and often used in chemical, petrochemical, and pharmaceutical industries.

What is Alloy 20 filler material?

For welding Alloy 20, the most commonly used filler material is ERNiCrMo-3 or Alloy 20Cb-3® wire, which offers excellent corrosion resistance and maintains the alloy’s integrity during fabrication, especially in chloride and acid-rich environments.

Which is better Alloy 20 or Hastelloy?

Both Alloy 20 and Hastelloy are corrosion-resistant, but Hastelloy (like C276) offers superior resistance to more aggressive chemicals and higher temperatures. However, Alloy 20 is more cost-effective and ideal for sulfuric acid environments, depending on application needs.

What is the trade name for Alloy 20?

The most recognized trade name for Alloy 20 is Carpenter 20® or Alloy 20Cb-3®, originally developed by Carpenter Technology. It is also marketed under Incoloy® Alloy 20 by Special Metals Corporation, widely used in chemical and marine sectors.

What is the difference between Alloy 20 and 316?

Alloy 20 offers significantly better resistance to sulfuric acid and chloride-induced corrosion than 316 stainless steel. While 316 is suitable for general corrosion environments, Alloy 20 is preferred in highly acidic and chemically aggressive conditions.

Which alloy is the strongest?

Strength depends on application, but Inconel® and Titanium alloys are among the strongest due to their high-temperature stability and tensile strength. For corrosion resistance in acids, Hastelloy C276 is stronger than Alloy 20, especially under extreme conditions.