Hastelloy C276 is a premium nickel-chromium-molybdenum-tungsten super alloy, widely recognized as one of the most versatile corrosion-resistant metallic materials available. As a standard solution-grade alloy without post-weld heat treatment required, C276 steel plate delivers exceptional resistance to both oxidizing and reducing corrosive media, effectively resisting pitting, crevice corrosion, stress corrosion cracking, and uniform chemical erosion. It is extensively applied in extreme industrial environments with high-temperature, high-pressure and strong corrosive conditions.

2. Chemical Composition (Standard Range, %)

Controlled strictly in accordance with ASTM B575 international standard to ensure stable alloy performance and consistent corrosion resistance:

Nickel (Ni): Balance (approx. 57.0%) – Serves as the base matrix, providing excellent structural stability and basic anti-corrosion performance

Chromium (Cr): 14.5 – 16.5 – Forms a dense and stable passivation film, resisting oxidation and corrosive erosion from acidic oxidizing media

Molybdenum (Mo): 15.0 – 17.0 – Dramatically enhances resistance to pitting, crevice corrosion and reducing acid corrosion

Tungsten (W): 3.0 – 4.5 – Optimizes high-temperature stability and localized corrosion resistance

Iron (Fe): 4.0 – 7.0 – Improves mechanical toughness and processing performance

Cobalt (Co): ≤ 2.5

Silicon (Si): ≤ 0.08

Carbon (C): ≤ 0.01 – Ultra-low carbon design avoids intergranular corrosion after welding

Phosphorus (P): ≤ 0.04, Sulfur (S): ≤ 0.03 – Strict impurity control for high purity

3. Physical & Mechanical Properties

3.1 Physical Properties (Room Temperature)

Density: 8.9 g/cm³

Melting Temperature Range: 1325°C – 1370°C

Modulus of Elasticity: 205 GPa

Coefficient of Thermal Expansion: 11.2 × 10⁻⁶ /°C

Thermal Conductivity: 11.6 W/(m·K)

Operating Temperature Range: -150°C to 400°C (stable mechanical and anti-corrosion performance)

3.2 Mechanical Properties (Annealed State)

Tensile Strength: ≥ 690 MPa

Yield Strength (0.2% Offset): ≥ 283 MPa

Elongation: ≥ 40% – Excellent ductility for bending, rolling and forming

Hardness: ≤ 100 HRB – Low hardness for easy mechanical processing

4. Surface Characteristics

C276 steel plates are supplied with standard industrial high-quality surfaces, including 2B, pickled, polished and blasted finishes, meeting global industrial manufacturing standards.

Smooth & Uniform Surface: Free of cracks, pits, inclusions, scratches and oxidation defects; consistent flatness and uniform thickness

Clean Passivation Layer: The surface forms a natural compact passivation film, featuring strong oxidation resistance and no rust spots in conventional atmospheric environments

High Processing Adaptability: Uniform surface stress, no residual deformation, suitable for precision cutting, welding, bending and surface finishing

Customizable Surface Treatment: Support customized polishing, sandblasting, acid pickling and anti-fingerprint treatment according to customer requirements

5. Core Advantages & Processing Performance

Superior Universal Corrosion Resistance: Resists corrosion by sulfuric acid, hydrochloric acid, nitric acid, mixed acid solutions, chloride ions, brine, flue gas and industrial wastewater, adapting to both oxidizing and reducing environments

Excellent Welding Performance: Ultra-low carbon content effectively prevents welding intergranular corrosion; no need for post-weld solution heat treatment, simplifying construction procedures

Strong Localized Corrosion Resistance: Outstanding resistance to pitting corrosion, crevice corrosion and stress corrosion cracking, far exceeding ordinary stainless steel and common nickel alloys

Stable High & Low Temperature Performance: Maintains stable mechanical properties and corrosion resistance under extreme temperature conditions

Easy Fabrication: Good ductility and plasticity, supporting conventional machining, cold and hot forming, and precision processing

6. Main Applications

Due to its comprehensive superior performance, C276 steel plate is the preferred material for harsh corrosive industrial equipment, widely used in global high-end industrial fields:

Chemical & Petrochemical Industry: Reaction vessels, storage tanks, heat exchangers, pipelines, valves and fittings for mixed acid, chloride and organic solvent working conditions

Environmental Protection & Flue Gas Treatment: Flue gas desulfurization (FGD) systems, denitrification equipment, waste gas and wastewater treatment devices, anti-corrosion lining plates

Pulp & Paper Industry: Bleaching equipment, digesters and corrosive medium conveying systems

Energy & Power Industry: Nuclear power auxiliary equipment, thermal power flue gas treatment systems, high-pressure corrosive fluid pipelines

Marine & Offshore Engineering: Seawater desalination equipment, offshore platform anti-corrosion components, brine circulation systems

Pharmaceutical & Fine Chemical Industry: High-purity chemical reaction equipment resisting complex medium corrosion

Industrial Manufacturing: Special anti-corrosion molds, precision anti-corrosion mechanical parts and high-end equipment lining materials

7. Equivalent Grade Standards

Hastelloy C276 has unified equivalent grades in major global industrial standards, facilitating international procurement, engineering design and cross-border project verification. The corresponding grades are listed below:

USA: UNS N10276, ASTM B575, ASME SB575

Germany / Europe: W.Nr. 2.4819, EN 10088

China: GB NS3304

Japan: JIS NCF276

ISO Standard: NiMo16Cr15W

All grades belong to the same nickel-chromium-molybdenum alloy system with identical chemical composition, mechanical properties and corrosion resistance, fully interchangeable for global industrial applications.

8. Product Supply Specifications

Available in full specifications: C276 steel plate, sheet, coil, flat bar and customized processed parts. Thickness tolerance meets international precision standards, with complete factory test reports (MTC), fully compliant with ASTM, ASME and EU industrial certification requirements. Custom cutting, bending, welding and surface processing services are supported to meet diverse customer processing demands.