Hastelloy B2 Pipe Maker in China

Q: Can I use Hastelloy B2 for Nitric Acid?

Absolutely not. Nitric acid is a strong oxidizer.Since B2 contains almost no Chromium,it will dissolve rapidly (almost violently) in nitric acid.Use hastelloy C276 pipe or stainless steel pipe for oxidizing acids instead.

As a leading Hastelloy C4 pipe maker in China,Kaysuns has over a decade of experience in production and international trade.We maintain ample inventory and are ready to ship your order at any time.Please feel free to contact us for a free,quick quote or to inquire about our products.

Hastelloy B2 Pipe is a high-performance piping component made from a solid-solution strengthened,nickel-molybdenum alloy (designated as UNS N10665).It is specifically engineered to withstand extreme reducing conditions,particularly where hydrochloric acid is present.

Our Capacity

We manufacture Hastelloy B2 seamless pipes ranging from 1/2” to 24” (6 mm to 610 mm) and Hastelloy B2 welded pipes ranging from 6” to 104” (159 mm to 2800 mm).
We offer fast and flexible delivery times and can integrate these products with others to provide comprehensive solutions.Even for small-batch orders,we utilize state-of-the-art equipment to manufacture your products,drawing on our more than 10 years of manufacturing experience.

Hastelloy B2 Equivalent Designations

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Kaysuns is a professional Hastelloy B2 Pipe Maker.Please feel free to contact me if you have any requirements.

Standards of Hastelloy B2 Pipe & Tube

For Hastelloy B2 pipes,the most commonly used standards are those established by ASTM and ASME.These standards are categorized based on the pipe manufacturing process.

Product Form	ASTM Standard	ASME Standard	Description
Seamless Pipe & Tube	ASTM B622	ASME SB622	Standard specification for seamless nickel and nickel-cobalt alloy pipe and tube.
Welded Pipe	ASTM B619	ASME SB619	Covers welded nickel and nickel-cobalt alloy pipe produced by automatic welding.
Welded Tube	ASTM B626	ASME SB626	Specifically for welded tubes intended for heat exchangers and general service.

Related Component Standards

Fittings (Elbows, Tees): ASTM B366 / ASME SB366
Forgings & Flanges: ASTM B462 / ASME SB462
Rod & Bar: ASTM B335 / ASME SB335
Plate & Sheet: ASTM B333 / ASME SB333

Chemical Composition of Hastelloy B2 Pipe, wt.%

The chemical composition of Hastelloy B2 Pipe (UNS N10665) is strictly defined by standards such as ASTM B622 (seamless) and ASTM B619 (welded).

Element	Ni	Mo	Fe	Cr	Co	Mn	Si	C	P	S
Hastelloy C4	Balance	26.0 – 30.0	2.0 Max	1.0 Max	1.0 Max	1.0 Max	0.10 Max	0.02 Max	0.04 Max	0.03 Max

Key Technical Notes

High Molybdenum (26-30%):
This is the primary alloying element that provides exceptional resistance to reducing environments,particularly hydrochloric acid at all concentrations and temperatures.
Ultra-Low Carbon (≤ 0.02%):
Crucial for minimizing carbide precipitation during welding,which prevents intergranular corrosion in the heat-affected zone (HAZ).
Low Iron/Chromium:
Keeping these elements low optimizes the alloy’s stability in pure reducing acids but makes it highly susceptible to corrosion if oxidizing salts (like ferric or cupric chlorides) are present.

What Are The Main Differences in Composition Between B2 And B3?

Similarities:
Both contain approximately 28% molybdenum and extremely low carbon and silicon content.
Differences:
B3 contains trace amounts of other elements (such as aluminum and manganese) and features a finely tuned composition designed to improve thermal stability.While B2 is prone to the precipitation of brittle phases between 538°C and 815°C,B3 significantly delays this process.

Mechanical Properties of Hastelloy B2 Pipe

In accordance with ASTM B622 (seamless pipes) and ASTM B619/B626 (welded pipes) standards,the mechanical property requirements for Hastelloy B2 (UNS N10665) pipes in the annealed condition are as follows.

Tensile Strength	Yield Strength	Elongation	Hardness	Density
≥ 760 MPa(110 ksi)	≥ 350 MPa(51 ksi)	≥ 40%	≤ 241 HBW(100 HRB)	9.22 g/cm³(0.333 lb/in³)

Can Hastelloy B2 Pipes Be Cold-bent or Formed?

Yes.With an elongation of 40%, B2 is very ductile.
Caution:
Like most nickel alloys,it work-hardens rapidly.If the cold work exceeds 10-15% deformation,a full solution anneal is usually required to restore corrosion resistance and ductility.

How Does B2 Perform At Cryogenic (Sub-zero) Temperatures?

Excellent.Unlike many carbon steels that become brittle when frozen,Hastelloy B2 maintains its high toughness and ductility at extremely low temperatures,making it suitable for specialized cryogenic chemical processes.

Thermal Properties of Hastelloy B2 Pipe

Property	Metric Value	Imperial Value
Melting Range	1330°C – 1380°C	2426°F – 2516°F
Thermal Conductivity	11.1 W/m·K	77.0 BTU-in/hr·ft²·°F
Specific Heat	373 J/kg·K	0.0891 BTU/lb·°F
Coeff. of Thermal Expansion	10.3 μm/m·°C (20–93°C)	5.72 μin/in·°F (68–200°F)

Heat Treatment and Fabrication

Solution Annealing:
Typically performed at 1066°C (1950°F) followed by a rapid water quench to maintain corrosion resistance and optimize mechanical properties.
Hot Working:
The alloy can be easily forged or hot worked within the temperature range of 982°C to 1232°C (1800°F to 2250°F).

Applications of Hastelloy B2 Pipe

FAQs About Hastelloy B2 Pipe

What is the "Superpower" of Hastelloy B2 Pipe?

Its extraordinary resistance to Hydrochloric Acid (HCl).It is one of the very few metallic materials that can handle HCl at all concentrations and temperatures,even up to the boiling point,while maintaining extremely low corrosion rates.

What is "Mid-Range Thermal Embrittlement"?

This is a critical physical limitation.Between 1000°F and 1500°F (538°C – 815°C),B2 undergoes a phase transformation that creates brittle intermetallic compounds.This makes the pipe as fragile as glass,leading to sudden cracks under thermal or mechanical stress.

Can I use Hastelloy B2 for Nitric Acid?

Absolutely not.Nitric acid is a strong oxidizer.Since B2 contains almost no Chromium,it will dissolve rapidly (almost violently) in nitric acid.Use hastelloy C276 pipe or stainless steel pipe for oxidizing acids instead.

Hastelloy B2 Pipe Maker in China | Immediate Supply