Hastelloy B3 Pipes

By Author: Adinox Overseas
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Hastelloy B3 Pipes – High-Purity Nickel Alloy Piping for Severe Reducing Environments
1. Introduction

Industrial systems operating with strong reducing acids demand piping materials that deliver predictable corrosion resistance, metallurgical stability, and long-term operational reliability. Hastelloy B3 Pipes are specifically engineered to meet these requirements, making them a preferred solution where failure due to corrosion is unacceptable.

This technical blog provides a comprehensive overview of Hastelloy B3 Pipes, explaining their alloy characteristics, performance advantages, applicable standards, manufacturing practices, and industrial applications. The objective is to equip engineers, EPC contractors, and procurement professionals with the clarity and confidence needed to specify and source this critical nickel alloy piping solution.

2. What Is Hastelloy B3 Pipes?

Hastelloy B3 Pipes are manufactured from a nickel–molybdenum alloy developed as an advanced version of the B-family alloys. The alloy is designed to provide exceptional resistance to strong reducing environments while ...
... offering improved thermal stability and fabrication reliability compared to earlier grades.

Alloy Type: Nickel–Molybdenum alloy

UNS Designation: UNS N10675

Applicable Standards:
ASTM B622 / ASME SB622 – Seamless Pipes
ASTM B619 / ASTM B626 – Welded Pipes

Compared to Hastelloy B2, Hastelloy B3 Pipes offer significantly improved resistance to heat-affected zone corrosion and enhanced stability during fabrication and service. This makes Hastelloy B3 Pipes the preferred choice for demanding hydrochloric acid and other reducing acid applications where process reliability is critical.

3. Properties & Advantages
3.1 Chemical Composition & Mechanical Properties

Typical Chemical Composition (wt%)

Nickel: Balance

Molybdenum: ~28.5%

Iron: ≤ 3%

Chromium: ≤ 1%

Carbon: ≤ 0.01%

Mechanical Properties (Solution Annealed)

Tensile Strength: ~760 MPa

Yield Strength: ~345 MPa

Elongation: ~40%

Service Temperature Capability: Suitable for moderate-temperature reducing environments

The optimized molybdenum content provides outstanding resistance to uniform corrosion in strong reducing acids, while low carbon minimizes the risk of sensitization and intergranular attack.

3.2 Key Performance Benefits

Exceptional resistance to hydrochloric, hydrobromic, and sulfuric acids

Superior resistance to pitting and crevice corrosion in reducing media

Improved weldability and fabrication stability compared to B2 alloys

Excellent ductility for forming and complex piping layouts

Long service life with reduced maintenance and downtime

Hastelloy B3 Pipes are not recommended for oxidizing environments, but within controlled reducing conditions, they deliver industry-leading performance.

4. Types / Variants of Hastelloy B3 Pipes

Seamless Hastelloy B3 Pipes
Designed for high-pressure and high-integrity process lines in critical acid service.

Welded Hastelloy B3 Pipes
Suitable for larger diameters and lower-pressure systems with cost efficiency.

Heat Exchanger and Condenser Pipes
Used in acid recovery, distillation, and chemical concentration equipment.

The choice of variant depends on pressure ratings, corrosion severity, and applicable design codes.

5. Standards & Specifications
5.1 Material & Dimensional Standards

ASTM B622 / ASME SB622

ASTM B619 / ASTM B626

ASME B36.10 / ASME B36.19

ANSI, EN, DIN, and JIS equivalents available upon request

5.2 Size & Pressure Range

Outside Diameter: 6 mm to 610 mm

Wall Thickness: SCH 5 to SCH 160 and custom requirements

Lengths: Random, double random, and cut-to-length

Manufactured to meet ASME B31.3 process piping requirements

Customization is available to meet project-specific dimensional and pressure demands.

6. Industrial Applications

Oil & Gas:
Acid injection systems, refining process lines, and specialty chemical handling units.

Chemical Processing:
Hydrochloric acid reactors, acid recovery units, pickling plants, and distillation systems.

Power Generation:
Chemical dosing lines and auxiliary systems operating in reducing environments.

Marine & Offshore:
Specialty chemical transfer systems with controlled reducing conditions.

Pharmaceutical & Process Industries:
High-purity chemical systems where corrosion resistance and material integrity are essential.

Hastelloy B3 Pipes perform reliably in each of these sectors due to their resistance to aggressive reducing media and stable metallurgy.

7. Manufacturing Process

Our Hastelloy B3 Pipes are produced using advanced manufacturing and quality assurance systems:

Hot extrusion and cold drawing for seamless pipes

Precision welding processes for welded pipes

Solution annealing to restore corrosion resistance and ductility

Chemical composition verification and mechanical testing

Dimensional inspection and surface quality evaluation

Non-destructive testing including eddy current, ultrasonic, and hydrostatic testing

Third-party inspection by BV, TUV, SGS, or client-appointed agencies

Export-grade packaging with full material traceability and documentation

8. Why Choose a Trusted Manufacturer

As an established global manufacturer and exporter of Hastelloy B3 Pipes, we provide:

Consistent alloy chemistry and strict international standard compliance

EN 10204 3.1 certification with full heat and batch traceability

Proven experience supplying EPC and large-scale industrial projects worldwide

Technical support for material selection, corrosion assessment, and application engineering

Long-term B2B partnerships focused on quality, reliability, and lifecycle value

Request a quotation, download the datasheet, or contact our technical sales team to discuss your project requirements.

9. FAQ – Hastelloy B3 Pipes

Q1: How is Hastelloy B3 different from Hastelloy B2?
Hastelloy B3 offers improved thermal stability, weldability, and resistance to heat-affected zone corrosion.

Q2: Are Hastelloy B3 Pipes suitable for hydrochloric acid service?
Yes, they are specifically designed for strong reducing acids, including hydrochloric acid.

Q3: Can Hastelloy B3 Pipes be welded easily?
Yes, they exhibit excellent weldability when standard nickel alloy welding procedures are followed.

Q4: Are custom sizes and schedules available?
Custom diameters, wall thicknesses, and lengths can be supplied as per project specifications.

10. Conclusion

Hastelloy B3 Pipes are a proven solution for industries operating in severe reducing environments where corrosion resistance and process reliability are non-negotiable. Their optimized chemistry, stable mechanical properties, and superior fabrication performance make them a strategic choice for critical piping systems.

For assured quality, technical expertise, and dependable long-term supply, partner with an experienced manufacturer of Hastelloy B3 Pipes. Contact us today for pricing, lead times, and engineering support.