Introduction

Hastelloy B-3 Alloy (UNS N10675 / Alloy B-3) is an improved version of Hastelloy B-2, designed specifically for equipment handling hydrochloric acid and other reducing acids. This nickel-molybdenum alloy offers better thermal stability and easier fabrication than its predecessor—unlike B-2, it is far less prone to forming harmful phases during welding and high-temperature exposure, making it the preferred choice for new equipment construction.

This corrosion resistant nickel alloy resists hydrochloric acid at all concentrations and temperatures, and also performs well in sulfuric, acetic, formic, and phosphoric acids. With excellent resistance to pitting, stress corrosion cracking, and heat‑affected zone attack, it is widely used in chemical processing, acid production, pharmaceutical equipment, and heat exchangers. Available in a full range of product forms to meet diverse application requirements.

Specifications & Process Options

Applications

1. Hydrochloric Acid Service & Acid Production

• For hydrochloric acid production, storage, and handling systems, Hastelloy B‑3 for hydrochloric acid delivers exceptional 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 hydrochloric acid plant equipment including reactors, storage tanks, and piping systems, Alloy B‑3 seamless pipe and tube provide long‑term reliability in the most aggressive HCl service conditions. The nickel molybdenum alloy withstands both uniform and localized attack in high‑purity acid environments.

• For acid production facilities handling sulfuric, acetic, formic, and phosphoric acids, UNS N10675 plate and pipe resist corrosion in non‑oxidizing media. This best alloy for hydrochloric acid service is the standard material for acid concentrators and recovery systems.

2. Chemical Processing & Reactor Vessels

• For chemical processing reactors, reaction vessels, and autoclaves in pure, reducing acid service, Hastelloy B‑3 for chemical processing provides the corrosion resistance and thermal stability required for demanding CPI applications. This corrosion resistant nickel alloy is used extensively in the construction of reaction vessels for pure acid service.

• For reactor vessels and pressure vessels handling hydrochloric acid and other reducing acids, ASTM B333 Hastelloy B‑3 plate and UNS N10675 pipe combine superior corrosion resistance with improved fabricability.

• For chemical processing equipment including heat exchangers, distillation columns, and piping systems, Alloy B‑3 resists pitting corrosion and stress corrosion cracking while maintaining structural integrity under thermal cycling.

3. Heat Exchangers & Pressure Vessels

• For heat exchangers in hydrochloric acid and reducing acid service, Hastelloy B‑3 for heat exchanger provides high thermal conductivity with outstanding resistance to localized attack and knife‑line corrosion. The hydrochloric acid resistant tube is widely specified for shell‑and‑tube exchangers and condenser tubing.

• For ASME‑coded pressure vessels in high‑temperature corrosive service, ASTM B622 Hastelloy B‑3 seamless pipe and ASTM B333 plate combine strength, fabricability, and corrosion resistance. The alloy's improved thermal stability minimizes fabrication concerns.

• For acid storage tanks and pickling equipment in steel processing operations, Hastelloy B‑3 withstands hydrochloric and sulfuric acid pickling baths with excellent resistance to heat‑affected zone attack.

4. Pharmaceutical Industry & Pollution Control

• For pharmaceutical industry equipment handling aggressive chemical intermediates and acid streams, Hastelloy B‑3 for pharmaceutical industry maintains product purity with non‑contaminating corrosion resistance in high‑purity acid environments.

• For pollution control equipment and chlorination processes, UNS N10675 pipe and tube resist corrosion in aggressive chemical environments, making it suitable for waste treatment systems and environmental technology applications.

5. Power Generation & Petrochemical Industry

• For power generation and petrochemical applications where components face extreme chemical exposure and high‑performance demands, Hastelloy B‑3 provides the durability and corrosion resistance required for long‑term service.

• For oil and gas processing equipment handling reducing acid environments, Alloy B‑3 is well‑suited for custom components requiring high corrosion resistance and durability.

FAQ – Hastelloy B-3 Alloy

Q: What is the difference between Hastelloy B‑3 and Hastelloy B‑2?

A: Hastelloy B‑3 alloy (UNS N10675) has significantly improved structural and thermal stability compared to Hastelloy B‑2. While B‑2 suffers from rapid formation of Ni₄Mo at around 750°C, it takes several hours at around 650°C to induce deleterious second phases in B‑3. This improved fabricability alloy minimizes problems associated with welding and fabrication, making B‑3 the preferred choice for new equipment construction.

Q: Is Hastelloy B‑3 suitable for hydrochloric acid service?

A: Yes. Hastelloy B‑3 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, formic, and phosphoric acids, as well as other non‑oxidizing media.

Q: What are the key ASTM standards for Hastelloy B‑3?

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, and SB335.

Q: What industries commonly use Hastelloy B‑3?

A: Chemical processing (reaction vessels, heat exchangers, piping systems for pure reducing acid service), hydrochloric acid production and handling, pharmaceutical industry (high‑purity acid equipment), pollution control and environmental technology, power generation, petrochemical, and oil and gas industries. This nickel molybdenum alloy is the material of choice for aggressive reducing acid environments where thermal stability and fabricability are critical.

We are a trusted Hastelloy B‑3 Supplier and Hastelloy B‑3 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‑3 plate, sheet, seamless pipe, tube, bar, round bar, rod, wire, forgings, flanges, pipe fittings, and fasteners 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.