Hastelloy® B2 Plates | UNS N10665 High-NiMo Acid-Resistant Plates for Chemical, Oil & Gas, Marine, Pharma & Power
Table of Contents:
A large Indian chemical complex on the coast had built its hydrochloric and mixed acid lines with what seemed like safe materials rubber‑lined carbon steel, 316L and generic nickel alloy claddings yet every shutdown revealed new under‑film corrosion, blistered linings and through‑wall leaks in high‑temperature HCl sections feeding reactors, distillation columns and scrubbers, forcing emergency plate patches and tank replacements long before depreciation schedules allowed. When the integrity and procurement teams rebuilt critical reactors, overhead systems and acid storage tanks in Hastelloy® B2 Plates (UNS N10665, 2.4617, NiMo28), they selected a nickel‑molybdenum alloy with about 26–30% Mo, iron typically below 2%, chromium below 1% and very low carbon, which data show delivers superior resistance to hydrochloric acid at all concentrations and temperatures, minimum tensile strength around 750–760 MPa, minimum yield strength about 340–350 MPa, elongation above 40% and hardness below roughly 240 HBW; subsequent thickness surveys measured corrosion rates in pure HCl service in the microns‑per‑year range instead of millimetres‑per‑year, turning constantly leaking equipment into stable, long‑life assets.
Hastelloy B2 is a wrought nickel‑molybdenum alloy designed specifically for strong reducing environments, with high nickel and 26–30% molybdenum and essentially no deliberate chromium, differentiating it from most other corrosion‑resistant alloys. Technical descriptions emphasise that Hastelloy B2 provides excellent resistance to hydrochloric acid at all concentrations and temperatures and significant resistance to other non‑oxidising acids such as sulfuric, acetic and phosphoric acids, and that its low carbon and iron contents suppress grain‑boundary carbide precipitation in weld heat‑affected zones so plates can be used “as welded” in many chemical‑process services.
For procurement heads, process and corrosion engineers, fabricators, OEMs and hardware or industrial supply stores supporting chemical, oil & gas, marine, pharma and power‑generation facilities, Hastelloy B2 plates are a targeted solution where 316L, 904L, duplex stainless or even C‑class nickel alloys cannot cope with pure, hot reducing acids or where iron or copper contamination has previously accelerated failure. Room‑temperature mechanical data from DIN 17750 and ASTM sources list minimum yield strength above about 340–350 MPa, minimum tensile strength above about 750–760 MPa, minimum elongation above 40% and hardness below about 240 HBW, giving plate the strength and toughness required for high‑pressure tanks, columns and heat exchangers in India’s aggressive acid services.
Aurico Alloys LLP can support these critical applications as an affordable, authentic Hastelloy® B2 Plates supplier, manufacturer and stockist in India with exports abroad, delivering plate to UNS N10665 / 2.4617 chemistry ranges in accordance with ASTM B333 / ASME SB333 with EN 10204 certification for chemical processing plants, oil and gas refineries, marine engineering projects, pharma equipment builders and power‑generation users.
High-quality Hastelloy® B2 Plates ready for industrial use.
Specification Overview
| Supplier & Role | Aurico Alloys LLP – Hastelloy B2 plate manufacturers in India and Hastelloy B2 plate stockist in Mumbai for oil and gas refineries, pharma, marine and power projects |
|---|---|
| Alloy Description | Nickel‑molybdenum alloy with no intentional chromium, engineered for strong reducing acids (especially hydrochloric acid) with excellent resistance to general, pitting and stress‑corrosion cracking in these environments |
| UNS / Werkstoff / EN | UNS N10665, Werkstoff 2.4617, EN NiMo28 / NiMo28Fe5, ISO C‑NiMo31 and related designations |
| Main Plate Standards | ASTM B333 / ASME SB333 Hastelloy B2 plates for sheet and plate; DIN 17750 for plates; other product standards such as ASTM B622, B626 and B366 for tubing and fittings used alongside plate in systems |
| Melting Point | Around 1370 °C (≈2500 °F) |
| Service Temperature Window | Environments up to about 540 °C in oxidising gases; from roughly 815 °C and above in reducing gases or vacuum; exposure between about 540–815 °C should be avoided because Ni₃Mo/Ni₄Mo intermetallics form and embrittle the alloy |
UNS & Equivalent Grades
| Property | Value |
|---|---|
| UNS number | N10665 |
| Werkstoff / EN number | 2.4617 |
| EN designation | NiMo28 |
| Density | 9.22 g/cm3 |
| Plate, sheet and strip specification | ASTM B333 |
Identifiers and physical constants for Hastelloy B-2. A dash means no such designation is published for this grade.
Stock & Product Availability
As a leading Hastelloy B2 plate stockholder in Maharashtra for offshore platforms, refineries and chemical plants, Aurico Alloys LLP can supply ASTM B333 / ASME SB333 Hastelloy B2 plate thicknesses and dimensions optimised for chemical storage tanks, acid reactors, tower shells, tube sheets and channel covers, typically in the 3–50 mm range with standard widths and cut‑to‑length capabilities for Indian projects. Commercial Indian data note that these plates are industrial grade with minimum tensile strength around 760 MPa, minimum yield around 350 MPa and minimum elongation around 40%, allowing thinner designs than many stainless steels while maintaining pressure and mechanical integrity.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | — | Balance |
| Molybdenum (Mo) | 26.0 | 30.0 |
| Iron (Fe) | — | 2.0 |
| Chromium (Cr) | — | 1.0 |
| Cobalt (Co) | — | 1.00 |
| Manganese (Mn) | — | 1.0 |
| Carbon (C) | — | 0.02 |
| Silicon (Si) | — | 0.10 |
| Phosphorus (P) | — | 0.04 |
| Sulfur (S) | — | 0.03 |
Composition limits for Hastelloy B-2. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property (Room Temperature, Plate) | Typical Value – Hastelloy B2 / UNS N10665 |
|---|---|
| Ultimate Tensile Strength | ≥750–760 MPa (≈110 ksi) minimum for plate per DIN/ASTM data |
| 0.2% Yield Strength | ≥340–350 MPa (≈51 ksi) minimum |
| Elongation | ≥40% in 2 inches according to ASTM B333 / ASME SB333 plate requirements |
| Hardness | ≤240 HBW (typical maximum) or Rockwell hardness meeting ASTM B333 limits for plate |
| Modulus of Elasticity | ≈217 GPa at 20 °C, decreasing to about 189 GPa at 540 °C for solution‑annealed plate |
| High‑Temperature Use | Recommended up to about 540 °C in oxidising gases and above about 815 °C in reducing gases or vacuum, avoiding 540–815 °C exposures because of embrittling intermetallic phases Ni₃Mo and Ni₄Mo. |
| Corrosion Behaviour | Excellent resistance to pure hydrochloric acid at all concentrations and temperatures, very good performance in sulfuric, acetic and phosphoric acids and strong resistance to chloride‑induced stress‑corrosion cracking and pitting in reducing environments. |
Applications & Benefits
Why this grade
Hastelloy B2 is a nickel-molybdenum alloy carrying about 28% molybdenum and essentially no chromium. That composition makes it the strongest performer the family offers in reducing acids — hydrochloric at all concentrations up to the boiling point, plus sulphuric, acetic and phosphoric. The same absence of chromium means it must not be put into an oxidising stream, or one carrying ferric or cupric ions. For new construction B3 is the usual specification; B2 is ordered to match existing plant.
- Chemical Processing & Acid Plants: Alloy B2 is widely used in reactors, acid storage tanks, heat exchangers, piping and tower internals for hydrochloric acid (all concentrations and temperatures), sulfuric, acetic and phosphoric acids, delivering extremely low corrosion rates in pure reducing acid environments where stainless and many Ni‑Cr alloys fail.
- Oil & Gas & Marine: Refineries and offshore platforms use Hastelloy B2 plates for high‑temperature acid gas scrubbing, pickling, acidising and chloride‑rich reducing services, with suppliers in Mumbai and Maharashtra promoting Hastelloy B2 plate stock for offshore platforms and marine heat exchangers where localized corrosion must be controlled.
- Pharma & Power Generation: In pharma and high‑purity plants, high‑purity Hastelloy B2 plates are used for reactors and transfer systems handling strong acids, while power plants use them in acid cleaning, FGD and high‑temperature reducing environments where accurate “Hastelloy B2 plate price per kg in India for power generation projects” and ASME SB333 compliance are important for budgeting and code design.
- Hardware & Industrial Supply Stores: Stocking custom‑cut Hastelloy B2 plate sizes for marine vessel components, chemical storage tanks and seawater heat exchangers allows hardware and industrial supply stores to serve customers who need quick availability of corrosion resistant Hastelloy B2 plates for marine engineering in India and verified exporters of Hastelloy alloy B2 plates for global oil industry projects.
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Hastelloy® B2 Plates from Aurico Alloys LLP, supplied to UNS N10665 / 2.4617 chemistry limits and ASTM B333 / ASME SB333 mechanical requirements, give chemical, oil & gas, marine, pharma and power‑generation users Ni‑Mo plates that combine very high resistance to hydrochloric and other strong reducing acids with good strength, weldability and as‑welded corrosion performance for their most critical tanks, reactors, heat exchangers and marine components are your highest‑risk acid, brine and reducing‑environment assets still relying on stainless steels and generic nickel alloys instead of optimised Hastelloy B2 plates?