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High-Purity Pure Niobium Crucibles (1).jpg
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Nb1 High-Purity Pure Niobium Crucibles: Preferred Choice for Precision Melting Under Extreme High-Temperature Conditions

Nb1 grade pure niobium crucibles are high-temperature melting containers made from high-purity commercial pure niobium (Nb content ≥ 99.95%, compliant with ASTM R04200) through multiple processes including vacuum melting billet making, integral spinning/stamping forming, precision machining, and annealing setting. According to specifications, they can be divided into laboratory small niobium crucibles (volume ≤ 500ml), industrial medium niobium crucibles (volume 500ml-5L), and large customized niobium crucibles (volume ＞5L). They are mainly used in scenarios such as rare metal purification, special alloy melting, high-temperature experimental reactions, and semiconductor material preparation. As a core category of high-purity niobium-based containers, relying on extreme high-temperature resistance (long-term stable operation below 1800℃, short-term resistance to 2000℃ high temperature), excellent corrosion resistance (strong tolerance to most acids, alkalis, molten salts, and high-temperature gases except hydrofluoric acid), as well as characteristics such as ultra-pure impurity-free material, tight structure from integral forming, and no material contamination at high temperatures, it has become a key equipment in fields with extremely high requirements on container purity, high-temperature resistance, and material safety, especially suitable for melting and experimental scenarios under high-precision and extreme high-temperature conditions.

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    Product specification

    Product Parameters
    Product Information

    Item

    Regular Specifications (Laboratory Small Crucibles)

    Regular Specifications (Industrial Medium/Large Crucibles)

    Customization Range

    Volume Specification

    10ml-500ml (commonly used 25ml/50ml/100ml/250ml)

    500ml-5L (commonly used 1L/2L/3L/5L)

    5ml-50L, customized special-shaped volume and dimensions on demand

    Wall Thickness Specification

    0.08mm-2.0mm

    2.0mm-8.0mm

    0.5mm-15mm, customizable thickened walls for high-pressure scenarios

    External Dimensions

    Caliber 5mm-100mm, height 5mm-150mm (cylindrical/conical)

    Caliber 100mm-300mm, height 150mm-500mm (cylindrical/square)

    Caliber 15mm-500mm, height 20mm-800mm, supporting customized special-shaped external dimensions

    Tolerance Range

    Wall thickness tolerance: ±0.01mm; Dimensional tolerance: ±0.1mm (compliant with ASTM B394 standard)

    Wall thickness tolerance: ±0.1mm; Dimensional tolerance: ±0.2mm (compliant with ASTM B394 standard)

    Customizable precision-grade tolerance to meet high-end experimental and equipment assembly requirements

    Forming Method

    Integral spinning forming, stamping forming

    Integral spinning forming, welding forming (for large-sized products)

    Customizable forming process on demand to ensure structural strength and sealing performance
    Product Name  Pure Niobium Crucibles, High-Purity Niobium Crucibles, Precision Melting Niobium Crucibles
    Brand Name  Yunjie
    Model  R04200 (ASTM Standard)
    Material  High-Purity Commercial Pure Niobium (Compliant with ASTM R04200 grade)
    Processes  Vacuum Melting Billet Making, Integral Spinning Forming/Stamping Forming, Precision Turning, Annealing Setting, Surface Polishing, Non-Destructive Testing
    Density  8.57g/cm³; Melting Point
    Core Advantages  Excellent high-temperature stability (long-term operation below 1800℃, short-term resistance to 2000℃), superior corrosion resistance (resistant to most acids, alkalis, and molten salts except hydrofluoric acid), ultra-pure impurity-free material, good sealing performance from integral forming, no harmful precipitation at high temperatures, stable structural strength, and high surface finish
    Surface Conditions  Pickled Surface, Bright Annealed Surface, Precision Polished Surface, Cold-Rolled Natural Color Surface
    Delivery Conditions  Soft State (M, fully annealed, easy for secondary processing), Hard State (Y, unannealed after forming, high strength)
    Processing Services  Customized dimensions (volume, wall thickness, caliber), special-shaped crucible processing, bottom reinforcement, edge wrapping, precision polishing, welded handles
    Minimum Order Quantity  1 piece (preferential terms available for bulk purchases, calculated based on actual orders)

    Classification

    Yunjie Nb1 High-Purity Pure Niobium Crucibles (1)
    • Classification by Specification & Dimension
      •Laboratory-Grade Small Pure Niobium Crucibles: Volume 10ml-500ml, wall thickness 0.08mm-2.0mm, integral spinning forming, high dimensional accuracy, and ultra-pure material. Suitable for laboratory micro-material melting, high-temperature experimental reactions, special material R&D and other scenarios, with customizable lid design and handles.
      •Industrial-Grade Medium/Large Pure Niobium Crucibles: Volume 500ml-50L, wall thickness 2.0mm-8mm, available in spinning or welding forming, high structural strength, and stable high-temperature performance. Suitable for industrial scenarios such as rare metal purification, special alloy melting, and mass production of semiconductor materials, supporting bottom reinforcement and leak-proof treatment.
    • Classification by Processing State
    • Classification by Surface Treatment Method

    Specification Selection Table and Composition Table

    Pure Niobium Crucible Specification Selection Table
    Chemical Composition Table

    Product Type

    Specification Range

    Core Features

    Application Scenarios

    Laboratory-Grade Precision Pure Niobium Crucibles

    Volume 10-500ml; Wall thickness 0.08-2.0mm; Caliber 5-100mm, supporting customized lid

    Ultra-pure material (Nb≥99.95%), integral forming, precise dimensions, no impurity precipitation

    University research experiments, micro rare metal melting, special material R&D, small-batch semiconductor preparation

    Industrial-Grade Universal Pure Niobium Crucibles

    Volume 500ml-5L; Wall thickness 2.0-8.0mm; Caliber 100-300mm, handle optional

    Stable structure, strong high-temperature resistance, excellent corrosion resistance, bulk supply available, easy to clean

    Industrial rare metal purification, special alloy melting, chemical high-temperature reactions, electronic material preparation

    Customized Pure Niobium Crucibles

    Customized per customer drawings (volume, wall thickness, external dimensions, surface treatment, additional structures)

    Strong adaptability, performance optimized on demand, personalized structure, strict matching with working condition requirements

    Special-shaped experimental devices, special high-temperature condition melting, customized industrial production, high-end research equipment supporting

    Grade

    Nb

    Impurity Content, Max. (≤)

    Impurity Content, Max. (≤)

    Impurity Content, Max. (≤)

    Impurity Content, Max. (≤)

    Impurity Content, Max. (≤)

    Impurity Content, Max. (≤)

    Impurity Content, Max. (≤)

    Impurity Content, Max. (≤)

     

     

    Fe

    Si

    Ni

    C

    N

    O

    H

    Zr

    Nb1

    ≥99.95

    0.005

    0.005

    0.005

    0.01

    0.01

    0.015

    0.0015

    0.02

     

     

    Cr

    Ta

    Mo

    W

    Ti

    Co

    Al

     

     

     

    0.002

    0.1

    0.01

    0.03

    0.02

    0.002

    0.002

    Characteristics

    01
    Extreme High-Temperature Resistance
    Pure niobium has a melting point of up to 2468℃, enabling long-term stable operation below 1800℃ and short-term resistance to 2000℃ extreme high temperatures. It maintains excellent mechanical properties and structural integrity at high temperatures without deformation or cracking, suitable for various high-temperature melting conditions.
    advantage-2
    02
    Superior Corrosion Resistance
    Stable operation in harsh environments such as strong acids (except hydrofluoric acid), strong alkalis, molten salts, and high-temperature oxidizing atmospheres. A dense oxide film formed on the surface can effectively resist corrosion without chemical reaction with melted materials or contaminating them, ensuring product purity.
    advantage-2
    03
    Ultra-Pure Material for Higher Safety
    Complies with high-purity Nb1 grade standards, with Nb content ≥ 99.95% and customizable 99.99% ultra-high purity grade. The content of impurities such as Fe, Si, and Ni is extremely low (≤0.005%), with no harmful impurity precipitation, fully suitable for high-precision melting scenarios such as semiconductors and rare metals.
    advantage-2
    04
    Advantages of Integral Forming Structure
    Adopting integral spinning or stamping forming process, no weld seams, good sealing performance, avoiding material leakage due to weld seam cracking at high temperatures. Meanwhile, the tight structure ensures strong load-bearing capacity, and the service life is much longer than that of spliced crucibles.
    advantage-2
    05
    Precise Dimensional Control
    Through precision turning, straightening, and annealing setting processes, the crucible has minimal caliber, wall thickness, and height dimensional tolerances, low roundness error, and good dimensional consistency, which can accurately match various melting equipment and experimental devices.
    advantage-2
    06
    Excellent Processing Adaptability
    Excellent ductility and weldability, supporting customization of special-shaped structures, welded handles, lid design, and thickened wall treatment. Meanwhile, multiple surface treatment methods are available to meet the use requirements of different scenarios.
    advantage-2

    Production Process

    1. Raw Material Preparation: Select high-purity sponge niobium, refine and melt it multiple times in a vacuum arc furnace to remove impurities and gases, producing niobium ingots that meet Nb1 grade and ASTM R04200 standards (Nb content ≥ 99.95%, uniform composition, high density).
    2. Billet Making & Forming: Heat the niobium ingot to a specific high temperature, then integrally form the crucible blank through spinning or stamping forming process to ensure tight structure and no internal defects of the blank, laying the foundation for subsequent precision machining.
    3. Precision Machining: Perform CNC turning and polishing on the crucible blank to precisely control the caliber, wall thickness, height, and inner wall finish, ensuring dimensional tolerances meet standards, and the inner wall is flat and smooth to avoid material adhesion.
    4. Intermediate Annealing: Insert intermediate annealing treatment during the processing to eliminate internal processing stress, restore material ductility and toughness, and avoid cracking and deformation caused by stress concentration during subsequent use.
    Yunjie Nb1 High-Purity Pure Niobium Crucibles (3)
    Yunjie Nb1 High-Purity Pure Niobium Crucibles (4)

    Production Process

    1. Finished Product Annealing: According to the processing state (soft state, hard state) required by customers, precisely control the annealing temperature, holding time, and cooling rate to ensure that the mechanical properties, dimensional stability, and high-temperature resistance of the crucible meet standards.
    2. Surface Treatment: Perform pickling, bright annealing, or precision polishing treatment as required to remove surface oxide scale and impurities, improve corrosion resistance, finish, and usability, meeting the appearance and performance requirements of different scenarios.
    3. Finishing & Inspection: Trim, level, and clean the finished products, then conduct strict testing including composition re-inspection, dimensional accuracy testing, surface quality testing, mechanical property testing, and non-destructive testing to ensure the products are free of cracks and pores, and the quality meets ASTM B394 standard, accompanied by material inspection reports and quality certificates.

    Application Fields

    01
    Laboratory Research
    High-temperature experimental reactions, special material R&D, micro rare metal melting, and superconducting material preparation in universities and research institutions. Relying on ultra-pure material and high precision, it ensures accurate experimental data and pure materials.
    6511419c2763338526
    02
    Metallurgical Industry
    Purification of rare metals (titanium, zirconium, tantalum, etc.), special alloy melting, and precious metal refining. Utilize high-temperature resistance and corrosion resistance to improve the purity and quality of metallurgical products.
    6511419c2763338526
    03
    Electronic Industry
    Semiconductor material preparation, high-end electronic component processing, and superconducting equipment supporting. Ultra-pure material with no impurity precipitation avoids contaminating electronic materials and ensures stable product performance.
    6511419c2763338526
    04
    Aerospace
    Melting of aerospace special materials and preparation of high-precision alloys. Adapting to extreme high-temperature conditions, ensuring the mechanical properties and purity of materials meet the strict requirements of aerospace equipment.
    6511419c2763338526
    05
    New Energy Field
    Melting of core materials for hydrogen energy equipment, processing of high-temperature fuel cell components, and preparation of superconducting energy storage materials. Adapting to high-temperature and high-purity requirements, improving the performance and safety of new energy equipment.
    6511419c2763338526
    06
    Chemical Field
    High-temperature chemical reactions, strong corrosive medium treatment, and molten salt reaction containers. With excellent corrosion resistance and high-temperature stability, it extends equipment service life and ensures production safety.
    6511419c2763338526

    Send Inquiry

    As a professional expert providing high-purity pure niobium (Nb1/R04200, compliant with ASTM B394 standard) and comprehensive solutions for various metal products, containers, pipes, rods/wires, and plates/sheets, Baoji Yunjie is ready to serve you at any time! For a full range of metal materials and customized products such as titanium, niobium, zirconium, nickel, aluminum, tantalum, tungsten, and cobalt, please feel free to contact us!