Introduction

Hastelloy B-2 Alloy (UNS N10665 / Alloy B-2 / W.Nr. 2.4617) is a solid-solution strengthened nickel-molybdenum alloy with significant resistance to reducing environments. Its extremely low carbon and silicon content minimizes the precipitation of carbides and other impurity phases in the weld heat-affected zone, allowing the alloy to be used in the as-welded condition without compromising corrosion resistance.

This hydrochloric acid resistant alloy offers excellent resistance to hydrochloric acid at all concentrations and temperatures, and withstands hydrogen chloride gas, sulfuric, acetic, and phosphoric acids. It also provides good resistance to pitting, stress corrosion cracking, and knife-line and heat-affected zone attack. With its high molybdenum content and exceptional performance in reducing environments, this corrosion resistant nickel alloy is widely used in chemical processing, acid production, pickling equipment, heat exchangers, reactor vessels, and pharmaceutical industry applications. Available in a full range of product forms to meet diverse application requirements.

Specifications & Process Options

We provide Hastelloy B-2 Size Chart, Thickness Chart, Weight Chart, and Tube Dimensions – request yours.

Applications

1. Hydrochloric Acid Service & Acid Production

• For hydrochloric acid production, storage, and handling systems, Hastelloy B‑2 for hydrochloric acid delivers superior resistance to pure HCl at all concentrations and temperatures. This hydrochloric acid resistant pipe and hydrochloric acid resistant plate are the preferred materials for HCl evaporators, distillation columns, and acid transfer lines.

• For acid production facilities handling sulfuric, acetic, and phosphoric acids, UNS N10665 pipe and plate resist corrosion in non‑oxidizing media. This best alloy for hydrochloric acid service is the standard material for acid concentrators and recovery systems.

• For chemical processing equipment including reactors, heat exchangers, and piping systems in reducing acid environments, Alloy B‑2 resists pitting, stress corrosion cracking, and knife-line attack. The alloy is widely used in most chemical process applications in the welded condition.

2. Reactor Vessels & Heat Exchangers

• For reactor vessels and pressure vessels handling hydrochloric acid and other reducing acids, ASTM B333 Hastelloy B‑2 plate and UNS N10665 pipe combine superior corrosion resistance with the ability to be used in as‑welded condition.

• For heat exchangers in hydrochloric acid and reducing acid service, Hastelloy B‑2 for heat exchanger provides high thermal conductivity with outstanding resistance to localized attack and knife-line corrosion.

• For pickling equipment in steel processing operations, Hastelloy B‑2 withstands hydrochloric and sulfuric acid pickling baths with excellent resistance to heat‑affected zone attack.

3. Pharmaceutical Industry & Chlorination Processes

• For pharmaceutical industry equipment handling aggressive chemical intermediates and acid streams, Hastelloy B‑2 for pharmaceutical industry maintains product purity with non‑contaminating corrosion resistance in high‑purity acid environments.

• For chlorination processes and equipment handling antimony chloride catalysts, Hastelloy B‑2 resists corrosion in highly aggressive chemical environments.

• For gasoline refining and other petrochemical applications, Alloy B‑2 provides reliable performance in reducing environments.

4. Storage Tanks & General Chemical Equipment

• For acid storage tanks handling hydrochloric, sulfuric, and phosphoric acids, Hastelloy B‑2 plate and sheet provide long‑term reliability in aggressive acid service.

• For pressure vessels in high‑temperature corrosive service, ASTM B622 Hastelloy B‑2 seamless pipe and ASTM B333 plate combine strength, fabricability, and corrosion resistance.

Note: This alloy is not suitable for applications involving ferric or copper salts, as iron or copper salts may cause rapid corrosion failure.

FAQ – Hastelloy B-2 Alloy

Q: Is Hastelloy B‑2 suitable for hydrochloric acid service?

A: Yes. Hastelloy B‑2 has excellent resistance to hydrochloric acid at all concentrations and temperatures. This hydrochloric acid resistant alloy is the best choice for pure HCl service, including acid production, storage, transfer, and processing equipment. It also withstands sulfuric, acetic, and phosphoric acids, as well as hydrogen chloride gas.

Q: Can Hastelloy B‑2 be used in the as‑welded condition?

A: Yes. Hastelloy B‑2 is a wrought nickel‑molybdenum alloy that can be used in the as‑welded condition. Its extremely low carbon and silicon content minimizes precipitation of carbides and other impurity phases in the weld heat‑affected zone, allowing the weld to retain sufficient corrosion resistance.

Q: What are the key ASTM standards for Hastelloy B‑2?

A: ASTM B333 covers plate, sheet, and strip; ASTM B622 covers seamless pipe and tube; ASTM B619 covers welded pipe; ASTM B626 covers welded tube; ASTM B335 covers bar; ASTM B564 covers forgings; ASTM B366 covers fittings. ASME equivalents include SB333, SB622, SB619, SB335, and SB564.

Q: What are the limitations of Hastelloy B‑2?

A: Hastelloy B‑2 is not suitable for applications involving ferric or copper salts, as iron or copper salts may cause rapid corrosion failure. Additionally, B‑2 alloy suffers from the rapid formation of Ni₄Mo at around 750°C, which can lead to embrittlement. For applications requiring improved thermal stability during fabrication, Hastelloy B‑3 is recommended.

We are a trusted Hastelloy B‑2 Supplier and Hastelloy B‑2 Manufacturer, China‑based, serving chemical processors, hydrochloric acid plant builders, pharmaceutical equipment manufacturers, and heat exchanger fabricators worldwide. All products comply with ASTM B333 / ASTM B622 / ASME SB333 with EN 10204 3.1 mill certificates, PMI verification, and dimensional inspection reports. We offer Hastelloy B‑2 plate, sheet, seamless pipe, tube, bar, round bar, rod, wire, forgings, flanges, and pipe fittings in custom sizes, with cut‑to‑size, precision machining, CNC machining, solution annealing, and forging services. Contact us at info@monokj.com for size chart, pricing, or custom requirements.