Product introduction

Pure nickel alloy plate is made from a nickel matrix (typically ≥99.0% nickel content, with high-purity grades exceeding 99.9%), with small amounts (or none) of trace elements such as carbon, silicon, and manganese. This plate differs from nickel-based alloys such as Inconel and Monel, which, despite their high nickel content, require alloying elements such as chromium and copper to achieve their specific properties. Its core advantages stem from nickel's inherent properties: excellent corrosion resistance, electrical and thermal conductivity, and low-temperature toughness, while also offering good machinability and weldability.

Core features

1. Excellent Corrosion Resistance

Nickel is extremely resistant to alkaline media (such as sodium hydroxide and potassium hydroxide solutions), and is not easily corroded even in high-temperature, concentrated alkali environments (one of pure nickel's most prominent advantages). This is why it is known as an "alkali-resistant metal."

It is stable in neutral salt solutions (such as sodium chloride and ammonium sulfate) and organic compounds (such as organic acids and alcohols), but is not resistant to strong oxidizing acids (such as nitric acid and concentrated sulfuric acid) or fluorine-containing media.

2. Excellent Mechanical Properties

At room temperature, it exhibits moderate strength (tensile strength approximately 400-500 MPa) and high plasticity (elongation ≥40%), making it easy to process through stamping, bending, and welding.

Excellent Low-Temperature Performance: It maintains good toughness below -200°C and exhibits no "low-temperature brittleness," making it suitable for cryogenic equipment.

3. Excellent Electrical and Thermal Conductivity

Its electrical conductivity is approximately 25% that of copper, and its thermal conductivity is approximately 15% of copper. While lower than copper, it is significantly higher than common stainless steel and most nickel-based alloys. It is suitable for applications requiring both electrical and thermal conductivity and corrosion resistance.

4. Unique Physical Properties

Nickel is ferromagnetic (nickel is a ferromagnetic metal), making it suitable for applications requiring both magnetic properties and corrosion resistance.

Its coefficient of thermal expansion is moderate (approximately 13 × 10⁻⁶/°C), close to that of glass and ceramics, making it a common sealing material for vacuum devices.

Grade

Production process

1. Raw Material Purification: Electrolytic refining or vacuum distillation is used to purify crude nickel (approximately 95%-98% purity) into high-purity nickel ingots (≥99.6%), removing harmful impurities such as iron, copper, and sulfur (which can reduce corrosion resistance and operational).

2. Vacuum Melting: Pure nickel ingots are melted in a vacuum induction furnace to further remove gases (such as H₂ and O₂) and trace inclusions, ensuring a uniform composition and preventing oxidation during the melting process.

3. Hot Working: The smelted ingot is heated to 850-1050°C and then hot rolled or hot forged into thick slabs (typically 20-100 mm thick). This process simultaneously breaks down the coarse grains in the cast structure and improves the slab's toughness.

4. Cold Rolling and Annealing: The thick slab undergoes multiple passes of cold rolling (at room temperature) with controlled reduction to achieve the target thickness (product thickness ranges from 0.1 mm thin strip to 50 mm thick plate). Annealing (400-900°C) is required after cold rolling to relieve processing stresses, restore plasticity, and adjust the grain size (typically controlled to 50-150 μm).

5. Finishing and Inspection: Edge defects are removed through flattening and shearing, followed by rigorous testing - including chemical composition analysis (spectrometer detection), mechanical property testing (tensile and impact), non-destructive testing (ultrasonic UT, eddy current ET) and surface quality inspection to ensure compliance with brand standards.

Application areas

1. Chemical and Metallurgical Industry

2. Electrical and Electronics Industry

3. Energy and Cryogenic Engineering

4. Medical Devices

5. Food Industry