Introduction

ASTM B622 Seamless Nickel-Cobalt Hastelloy Pipe is the standard specification for seamless pipe and tube of nickel‑cobalt‑chromium‑molybdenum alloys intended for severe corrosive and high‑temperature service. This specification covers a comprehensive range of Hastelloy alloy pipe grades, including Hastelloy C276 (UNS N10276) , Hastelloy C22 (UNS N06022) , Hastelloy C2000 (UNS N06200) , Hastelloy B2 (UNS N10665) , and Hastelloy B3 (UNS N10675) , available in cold‑worked or hot‑finished conditions.

Hastelloy C276 seamless pipe is the most widely used grade, offering exceptional resistance to oxidizing and reducing environments, sulfuric acid, hydrochloric acid, wet chlorine gas, and chlorides. Hastelloy C22 seamless pipe provides enhanced resistance to pitting, crevice corrosion, and oxidizing media. Hastelloy C2000 seamless pipe features a copper addition delivering exceptional resistance to sulfuric acid across a wide concentration range. Hastelloy B2 seamless pipe and Hastelloy B3 seamless pipe are specifically designed for hydrochloric acid processing with excellent resistance to reducing acids.

All products are supplied in solution annealed condition, available in custom sizes, Schedule 40, Schedule 80, thin wall, and heavy wall configurations.

Specifications & Process Options

Applications

1. Chemical Processing & Petrochemical Industry

• For reactors, heat exchangers, and piping systems handling aggressive media such as sulfuric acid, hydrochloric acid, and chlorinated organics, Hastelloy C276 heat exchanger bundles deliver benchmark corrosion resistance that outperforms stainless steels and most nickel alloys. Its resistance to grain boundary precipitates during welding makes it suitable for as‑welded service.

• In flue gas desulfurization systems, scrubbers, and ducting handling acidic flue gases, Hastelloy C22 scrubber sections offer the broadest overall corrosion resistance with outstanding resistance to pitting and crevice attack. It eliminates post‑weld annealing in most applications.

• For sulfuric acid service across a wide concentration range, Hastelloy C2000 transfer line sections deliver exceptional performance due to deliberate copper addition. It also handles mixtures of sulfuric acid with oxidizing acids and chloride ions in petrochemical and recycled acid recovery systems.

• In hydrochloric acid production and processing at all concentrations and temperatures, Hastelloy B2 reactor feed lines and Hastelloy B3 evaporator coils provide excellent resistance to pitting and stress corrosion cracking. Hastelloy B3 offers enhanced resistance in reducing media compared to B‑2.

2. Pollution Control & Waste Treatment

• For pollution control equipment including flue gas desulfurization scrubbers and waste incineration systems, Hastelloy C22 absorber sections resist aggressive industrial waste streams, chlorides, and acidic flue gases in hospital waste, municipal waste, and spent solvent incineration.

• In environmental engineering systems handling wet and dry corrosive zones, Hastelloy C276 condenser tubing provides lasting corrosion resistance and dimensional stability under high temperatures.

3. Oil & Gas / Offshore / Marine Engineering

• For offshore oil and gas platforms, subsea control lines, and topside process piping, Hastelloy C22 subsea control lines offer premier resistance to chloride‑induced pitting and crevice corrosion at chloride concentrations up to 50,000 mg/L, ideal for harsh brine environments and seawater systems.

• Hastelloy C276 process piping is specified for sour gas processing components, seawater systems, and marine engineering where exposure to wet chlorine gas and chlorides is unavoidable.

4. Pulp & Paper / Pharmaceutical / Nuclear

• In the pulp and paper industry, Hastelloy C276 digester sections serve in digesters, bleach plants, and chlorine injection nozzles. Hastelloy C22 bleach plant piping is used where pitting and crevice corrosion are concerns.

• For pharmaceutical equipment requiring high purity and corrosion resistance, ASTM B622 Hastelloy API synthesis lines maintain surface integrity in clean‑in‑place systems.

• In nuclear industry applications, Hastelloy C276 reactor coolant sections provide excellent resistance to high‑temperature water corrosion and radiation stability.

FAQ – ASTM B622 Hastelloy Pipe

Q: What is the difference between Hastelloy C276, C22, and C2000?

A: Hastelloy C276 seamless pipe is the broad‑spectrum workhorse with excellent resistance to both oxidizing and reducing environments. Hastelloy C22 seamless pipe offers enhanced resistance to oxidizing media and superior pitting/crevice corrosion resistance. Hastelloy C2000 seamless pipe has a deliberate copper addition providing exceptional resistance to sulfuric acid. C‑22 is preferred for flue gas desulfurization and brine environments, while C‑276 remains the standard for mixed acid and chlorinated chemical processing.

Q: When should I choose Hastelloy B2 over B3, and vice versa?

A: Hastelloy B2 seamless pipe provides excellent resistance to hydrochloric acid at all concentrations and temperatures. Hastelloy B3 seamless pipe offers enhanced processing characteristics and improved corrosion resistance properties compared to B‑2. B‑3 is preferred for applications requiring superior resistance to heat‑affected zone attack and better thermal stability. Both are suited for hydrochloric acid, sulfuric acid, acetic acid, and phosphoric acid service.

Q: What industries commonly use ASTM B622 Hastelloy pipe?

A: Chemical and petrochemical processing (reactors, heat exchangers, piping systems), pollution control and flue gas desulfurization, oil and gas and offshore platforms, marine engineering, pulp and paper manufacturing, pharmaceutical equipment, and nuclear power generation.

Q: Can ASTM B622 pipe be welded without post‑weld heat treatment?

A: Yes. Hastelloy C276 seamless pipe and Hastelloy C22 seamless pipe resist the formation of grain boundary precipitates in the weld‑heat affected zone, making them suitable for use in the as‑welded condition. Hastelloy B2 seamless pipe and Hastelloy B3 seamless pipe are also suitable for most chemical process applications in the welded condition. All ASTM B622 pipe and tube shall be supplied in the solution annealed and descaled condition.

We are a trusted ASTM B622 Seamless Nickel-Cobalt Hastelloy Pipe Supplier and Hastelloy Pipe Manufacturer, China‑based, serving chemical processors, power plants, oil and gas contractors, and marine fabricators worldwide. All products comply with ASTM B622 / ASME SB622 with EN 10204 3.1 mill certificates, PMI verification, hydrostatic and eddy current test reports. We offer cold‑drawn seamless Hastelloy pipe in custom sizes with pickled and polished surface finishes. Expedited delivery available for standard OD sizes and schedules. Contact us at info@monokj.com for size chart, pricing, or custom requirements.