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Nickel Alloy Grade Data Sheet

Hastelloy B-2

Hastelloy B-2 is commonly specified for equipment exposed to hydrochloric acid, sulfuric acid, acetic acid, phosphoric acid and other strongly reducing process media. Its high nickel and molybdenum content provides excellent resistance to reducing acids, pitting and stress corrosion cracking. The alloy is supplied in plate, sheet, strip, bar, pipe, tube, wire, forging and fitting forms for chemical processing equipment, reactors, pressure vessels, heat exchangers, piping systems, pumps and valves.

 

 

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Material Overview

Hastelloy B-2 material profile

A concise grade introduction for buyers who need to confirm composition, properties, standards, available forms and suitable applications before sending an inquiry.

Engineering profile

Hastelloy B-2 is commonly specified for equipment exposed to hydrochloric acid, sulfuric acid, acetic acid, phosphoric acid and other strongly reducing process media. Its high nickel and molybdenum content provides excellent resistance to reducing acids, pitting and stress corrosion cracking. The alloy is supplied in plate, sheet, strip, bar, pipe, tube, wire, forging and fitting forms for chemical processing equipment, reactors, pressure vessels, heat exchangers, piping systems, pumps and valves.

 

 

Hastelloy B-2

Technical data on this page is for material selection reference. Final acceptance values should be confirmed by the purchase standard, heat treatment condition, product form, size and material test certificate.

Chemical Composition

Hastelloy B-2 composition range

The following table shows common limiting composition values for Alloy 625 / UNS N06625. Actual product chemistry is reported by heat on the material test certificate.

Element Symbol Typical Requirement Role in Alloy B-2
Nickel Ni Balance Forms the alloy matrix and provides resistance to reducing acids and stress corrosion cracking.
Molybdenum Mo 26.0-30.0 Provides excellent resistance to hydrochloric acid, sulfuric acid, pitting and localized corrosion.
Iron Fe 2.0 max Kept low to preserve corrosion resistance in strongly reducing environments.
Chromium Cr 1.0 max Restricted because Alloy B-2 is designed primarily for reducing rather than strongly oxidizing service.
Carbon C 0.02 max Controlled to reduce harmful grain-boundary precipitation and maintain weld heat-affected-zone performance.
Silicon Si 0.10 max Kept low to improve thermal stability and resistance to intergranular corrosion.
Manganese Mn 1.0 max Controlled minor alloying and processing element.
Cobalt Co 1.0 max Controlled residual element.
Phosphorus P 0.040 max Controlled impurity for grain-boundary integrity and fabrication performance.
Sulfur S 0.030 max Controlled impurity affecting hot workability and weld quality.

 

 

Physical Properties

Key physical and thermal data

These values help customers compare density, thermal behavior, magnetic response and conductivity during early material selection.

Property Metric Value Imperial / Notes Condition
Density 9.22 g/cm3 0.333 lb/in3 Room temperature
Melting Range 1330-1380 °C 2426-2516 °F Typical range
Specific Heat Approx. 377 J/kg·K Approx. 0.090 Btu/lb·°F Approx. 20 °C
Thermal Conductivity Approx. 11.4 W/m·K Approx. 79 Btu·in/ft2·h·°F Approx. 20 °C
Electrical Resistivity Approx. 137 µΩ·cm Approx. 824 ohm-cmil/ft Room temperature
Modulus of Elasticity Approx. 217 GPa Approx. 31.5 x 103 ksi Annealed, room temperature
Mean Thermal Expansion Approx. 10.3 x 10-6/K Approx. 5.72 x 10-6/°F 20-93 °C

 

 

Mechanical Properties

Room-temperature mechanical properties

Mechanical properties vary with product form, size, processing route and heat treatment. The table below summarizes commonly referenced nominal values for material selection.

Product Form / Condition Tensile Strength Yield Strength, 0.2% Elongation Hardness
Plate, sheet and strip – solution annealed 760 MPa min 350 MPa min 40% min 100 HRB max
Rod and bar – solution annealed 760 MPa min 350 MPa min 40% min 100 HRB max
Seamless pipe and tube – solution annealed 760 MPa min 350 MPa min 40% min By specification
Welded pipe and tube – solution annealed 760 MPa min 350 MPa min 40% min By specification
Wire – annealed 760 MPa min 350 MPa min 40% min By size and specification
Forgings – solution annealed 760 MPa min 350 MPa min 40% min By specification

 

 

For pressure equipment, aerospace parts or project-specific acceptance, use the minimum requirements in the specified ASTM, ASME, AMS, EN or customer drawing rather than nominal values.

Standards & Specifications

Common Hastelloy B-2 standards by product form

YSN128 can quote Alloy 625 products according to ASTM, ASME, AMS, EN, DIN, ISO or customer drawing requirements. Certificate scope can be matched to the purchase order.

Product Form Common Standards Typical Supply Item Certificate / Inspection
Plate, Sheet and Strip ASTM B333 / ASME SB333, DIN 17750, EN or project specification Hot rolled plate, cold rolled sheet, strip, coil and cut blanks EN10204 3.1, chemical analysis and mechanical test
Rod and Bar ASTM B335 / ASME SB335, DIN 17752 Round bar, rod and machined bar MTC, PMI, dimensional inspection and UT when required
Seamless Pipe and Tube ASTM B622 / ASME SB622 Seamless pipe, process tube and heat exchanger tube Hydrostatic test, eddy current test, PMI and MTC
Welded Pipe ASTM B619 / ASME SB619 Longitudinally welded pipe and large-diameter fabricated pipe Radiographic or penetrant testing, hydrotest and MTC
Welded Tube ASTM B626 / ASME SB626 Welded heat exchanger, condenser and process tube Hydrotest, pneumatic or eddy current test and MTC
Forgings and Flanges ASTM B564 / ASME SB564 Rings, discs, blocks, shafts and forged flanges Heat-treatment record, UT, PMI and dimensional inspection
Fittings ASTM B366 / ASME SB366 Elbows, tees, reducers, caps and drawing-based fittings PMI, dimensional inspection, NDT and MTC
Welding Products AWS A5.14 ERNiMo-7, AWS A5.11 ENiMo-7 Matching welding wire, welding rod and covered electrodes Mill certificate, controlled chemistry and dimensional inspection

 

 

Available Product Forms

Hastelloy B-2 supply range

Review available product forms, size ranges, standards and delivery options for this alloy.

Form Common Size Range Delivery Condition Typical Applications Page Link
Pipe & Tube OD 6-1219 mm, wall thickness or schedule to specification Seamless or welded, solution annealed, descaled and pickled Hydrochloric acid piping, reactors, heat exchangers and chemical process systems View Pipe & Tube
Round Bar Diameter 3-600 mm, custom cut lengths available Hot rolled, forged, solution annealed, peeled, ground or polished Pump shafts, valve stems, fasteners and machined chemical-process components View Round Bar
Sheet & Plate Thickness 0.5-100 mm, custom widths and lengths Hot rolled or cold rolled, solution annealed, descaled and pickled Reactors, pressure vessels, tanks, heat exchangers and chemical equipment View Sheet & Plate
Strip & Foil Thickness 0.02-3 mm, slit widths and coil sizes to specification Cold rolled, annealed, pickled or bright finished Corrosion-resistant seals, diaphragms, gaskets and formed process components View Strip & Foil
Wire Diameter 0.1-12 mm, coil, spool or straight-length supply Cold drawn, annealed, bright or pickled Springs, mesh, screens, formed parts and fastener production View Wire
Fasteners Standard and custom bolts, nuts, screws, studs and washers from M3 to M100 Solution annealed, machined, rolled thread or custom finished Acid-processing vessels, pumps, valves, piping systems and chemical plants View Fasteners
Fittings NPS 1/2-48 in, ASME, EN and custom drawing dimensions Seamless, welded or fabricated, solution annealed and pickled Reducing-acid process piping, reactors, transfer lines and heat exchangers View Fittings
Flanges NPS 1/2-48 in, ASME B16.5, ASME B16.47, EN or custom specifications Forged or cut from plate, solution annealed, machined and inspected Chemical process piping, pressure vessels, valves and acid-transfer systems View Flanges
Forgings Rings, discs, blocks, shafts and drawing-based components to project dimensions Forged, solution annealed, rough machined or finish machined Pump and valve parts, pressure components, agitator shafts and heavy-duty process equipment View Forgings
Welding Wire Diameter 0.8-4.0 mm, spool, coil or straight welding rod Clean bright finish, precision drawn and controlled chemistry Joining Alloy B-2, chemical-equipment repair and corrosion-resistant overlay View Welding Wire

 

 

Material Selection Guide

When to consider Hastelloy B-2

This guide helps buyers connect service conditions with the typical advantage of Alloy 625. Final selection should consider medium concentration, temperature, pressure, fabrication, availability and budget.

Service Requirement Why Alloy B-2 Helps Common Product Form Buyer Note
Hydrochloric acid service High nickel and molybdenum contents provide excellent resistance to hydrochloric acid over a broad range of concentrations and temperatures. Pipe, tube, plate, fittings, flanges and valve components Confirm acid concentration, temperature, pressure and contamination level.
Sulfuric acid in reducing conditions The nickel-molybdenum composition provides strong resistance to many sulfuric acid environments when oxidizing contaminants are controlled. Plate, pipe, tube, bar and fabricated vessels Check concentration, temperature, aeration and ferric-ion content.
Acetic and phosphoric acid processing Alloy B-2 resists many reducing organic and inorganic acid environments used in chemical production. Reactors, heat exchangers, piping and pump components Review the complete process chemistry and possible oxidizing impurities.
Wet hydrogen chloride gas The alloy provides excellent resistance to wet HCl and related reducing chloride environments. Pipe, tube, fittings and fabricated process equipment Confirm moisture, temperature, pressure and shutdown conditions.
Pitting and stress corrosion cracking High molybdenum content and the nickel-rich matrix provide useful resistance to localized corrosion and chloride-related cracking. Sheet, plate, pipe, tube and fasteners Evaluate crevices, deposits, residual stress and process contaminants.
Welded chemical equipment Low carbon, silicon and iron contents reduce harmful precipitation compared with older Alloy B compositions. Plate, sheet, pipe, tube and fittings Use qualified welding procedures, matching filler and rapid cooling after solution annealing.
Strongly oxidizing environments Alloy B-2 is optimized for reducing media and is generally not the preferred choice for strongly oxidizing acids or oxidizing salts. Selection must be reviewed before supply Check for ferric ions, cupric ions, free chlorine, oxygen and other oxidizing contaminants.

 

 

Why Choose Us

Supply and quality support for Hastelloy B-2

For ranking traffic, buyers need more than a data sheet. This section gives clear trust signals for procurement, engineering and quality teams.

STASTM / ASME / AMS / EN

Quotation can be matched to project standards and product form specifications.

MTEN10204 3.1 MTC

Heat number, chemistry, mechanical properties and inspection records can be supplied.

QCPMI & Inspection

PMI, UT, dimensional inspection, visual inspection and packing check are available.

CSCustom Size

Cutting, machining allowance, rough machining and drawing-based supply can be arranged.

EPExport Packing

Wooden case, bundle, waterproof protection and international shipping documents.

RFFast Technical Reply

Send grade, size, standard, quantity and destination for a practical quotation route.

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FAQ

Hastelloy B-2 questions from buyers

Find practical answers about procurement, standards, fabrication and industrial applications.

Hastelloy B-2 is mainly used for equipment handling hydrochloric acid, sulfuric acid, acetic acid, phosphoric acid and other strongly reducing chemicals. Typical applications include reactors, pressure vessels, heat exchangers, process piping, pumps, valves and acid-production equipment.

Yes. UNS N10665 is the standardized UNS designation for Hastelloy B-2. The material may also be identified as Alloy B-2, Nickel Alloy B-2, W.Nr. 2.4617 or NiMo28.

Its high nickel and molybdenum content provides excellent resistance to hydrochloric acid across a broad range of concentrations and temperatures, provided that strongly oxidizing contaminants are not present.

Alloy B-2 is designed primarily for reducing environments. Strong oxidizers, ferric salts, cupric salts, free chlorine and other oxidizing contaminants can significantly increase corrosion, so the complete process chemistry must be reviewed before selection.

Both are nickel-molybdenum alloys for reducing acids. Hastelloy B-3 generally provides improved thermal stability and fabrication characteristics, while B-2 remains widely specified for existing equipment, established designs and replacement components.

YSN128 can quote plate, sheet, strip, round bar, rod, wire, seamless or welded pipe and tube, forgings, flanges, fittings, fasteners and matching welding products. Custom cutting, machining allowance and drawing-based supply can be discussed.

Common standards include ASTM B333 for plate, sheet and strip, ASTM B335 for rod and bar, ASTM B622 for seamless pipe and tube, ASTM B619 for welded pipe, ASTM B626 for welded tube, ASTM B564 for forgings and flanges, ASTM B366 for fittings and the corresponding ASME specifications.

Yes. Alloy B-2 can be welded using qualified nickel-alloy procedures, clean joint surfaces, controlled heat input and compatible filler metals such as ERNiMo-7 or ENiMo-7. The welding procedure should follow the applicable project code and service requirements.

Yes. EN10204 3.1 material certificates can be supplied on request, including heat number, chemical composition, mechanical properties, heat-treatment condition and applicable inspection results.

Please send the grade or UNS number, product form, dimensions, quantity, applicable standard, delivery condition, certificate requirements, destination and complete service conditions. For corrosion review, include the chemical composition, concentration, temperature, pressure and possible oxidizing contaminants.

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