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Help Center4j32 Invar Alloy Rod, Refined Steel Furnace Vacuum Solution Material, 1j22 Cobalt-vanadium Soft Magnetic Alloy Round Steel, Customized Polished Round Bar
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Industry Pain Points and Solutions: In the fields of precision instruments, aerospace, and high-end electronic manufacturing, the thermal expansion characteristics of materials directly affect the long-term operation stability and accuracy of equipment. Traditional steel is prone to deformation under temperature fluctuations, leading to changes in fit clearance, signal drift, and even structural failure. At the same time, the magnetic permeability attenuation and eddy current loss of soft magnetic materials in high-frequency electromagnetic environments will seriously restrict the performance of devices. In addition, many harsh working conditions (such as vacuum, high temperature, and strong corrosion) require materials to have pure structures and stable physical and chemical properties, while ordinary processes are difficult to meet multiple requirements such as low expansion, high magnetic permeability, corrosion resistance, and precision machining at the same time. In response to these pain points, Liaocheng Jincheng Yangming Special Steel Co., Ltd., relying on years of special steel production experience, uses the vacuum solution treatment technology of the refined steel furnace to launch a series of products such as 4J32 Invar alloy rods and 1J22 cobalt-vanadium soft magnetic alloy round steel. Through strict composition control and vacuum solution treatment processes, these materials effectively eliminate internal stress and optimize the grain structure, enabling the products to maintain extremely low thermal expansion coefficients or excellent magnetic properties in a wide temperature range. At the same time, a customized smooth round surface is provided to meet the requirements of high-precision assembly, providing a reliable material solution for the industry.
Working Mechanism and Product Features: 4J32 Invar alloy (also known as Invar alloy) is based on the Invar effect of nickel-iron alloy and has an extremely low thermal expansion coefficient (typical value ≤1.2×10⁻⁶/℃) near the Curie temperature. Its working principle is to make the magnetostrictive effect and thermal expansion cancel each other out through the precise ratio of nickel content (about 32% nickel, the rest is iron), so as to achieve almost zero dimensional change in the range of -60℃ to +100℃. After vacuum solution treatment, this material has a uniform structure, no segregation, and eliminates pores and inclusions. It is not easy to deform after processing and is suitable for applications with extremely high requirements for thermal stability, such as standard measuring tools, laser equipment, and precision instrument skeletons. 1J22 cobalt-vanadium soft magnetic alloy is a high-saturation magnetic induction soft magnetic material of the iron-cobalt-vanadium system. Its saturation magnetic induction can reach 2.4T, the coercive force is low (≤40A/m), and the initial magnetic permeability is as high as over 10,000. Through vacuum smelting and solution treatment, this alloy eliminates carbide segregation and improves the stability of magnetic properties. It is especially suitable for manufacturing high-frequency and high-power density equipment such as aerospace motor rotors, electromagnetic sensors, and magnetic shielding components. In addition, the refined steel furnace vacuum solution treatment material series also includes maraging steel, precipitation-hardening stainless steel, etc., all of which adopt the process route of vacuum melting + solution treatment + aging to ensure the purity and performance consistency of the materials. All rods can be customized with a smooth round surface according to customer requirements. The dimensional tolerance can be controlled at the h6~h9 level, and the surface roughness Ra ≤0.8μm, meeting the requirements of direct assembly or precision machining.
| Parameter Items | Typical values of 4J32 Invar alloy rods | Typical values of 1J22 cobalt-vanadium soft magnetic alloy rods |
| Density (g/cm³) | 8.1 | 8.2 |
| Linear expansion coefficient (×10⁻⁶/℃, 20~100℃) | ≤1.2 | 11.0~12.5 |
| Curie temperature (℃) | 230 | 980 |
| Saturation magnetic induction intensity (T) | — | ≥2.4 |
| Coercivity (A/m) | — | ≤40 |
| Initial magnetic permeability (μᵢ) | — | ≥10000 |
| Tensile strength (MPa) | ≥450 | ≥700 |
| Hardness (HRC) | ≤25 (solution state) | ≤35 (solution state) |
| Surface roughness (Ra, μm) | ≤0.8 (smooth round) | ≤0.8 (smooth round) |
Product advantages and trust endorsement: Liaocheng Jincheng Yangming Special Steel Co., Ltd. is located in Liaocheng City, Shandong Province. It has been deeply involved in the special steel industry for many years and mainly deals in precipitation hardening steel, duplex steel, heat-resistant steel, corrosion-resistant alloys, austenitic steel, martensitic steel, etc. The company is equipped with a fine steel melting furnace and a vacuum solution treatment line, and can implement full-process quality control on each batch of materials. All bars are shipped out after spectral analysis, mechanical testing, magnetic property testing (for soft magnetic alloys) and thermal expansion coefficient verification to ensure data traceability. In many fields such as petroleum, chemical industry, shipbuilding, nuclear engineering, aerospace, mining, textile and construction machinery, our products have helped customers solve the problems of deformation and magnetic stability of key components. For example, in the aerospace inertial navigation system, 4J32 Invar alloy rods are used as the gyroscope skeleton and can still maintain stable geometric dimensions after years of temperature cycling; in high-end solenoid valves, 1J22 soft magnetic alloy round steel significantly improves the response speed and energy efficiency. We adhere to the business principle of seeking truth from facts and honesty, and have won the long-term trust of many customers. If you are looking for customized bars with low expansion or high magnetic permeability for precision equipment, welcome to contact us with detailed technical requirements, and we will recommend the optimal process plan and material grade for you. It is recommended that you provide parameters such as the operating temperature range, magnetic requirements (such as saturation magnetic induction intensity, coercivity), dimensional tolerance and surface condition when consulting, so that we can make an accurate match.
Frequently Asked Questions (FAQ)
- 1. What are the differences between 4J32 Invar alloy and ordinary Invar alloys (such as 4J36)?
- The nickel content of 4J32 is about 32%, and its Curie temperature is about 230℃. It has a lower and more stable expansion coefficient in the range of -60℃ to 100℃. While 4J36 (with 36% nickel) has a Curie temperature of about 280℃, and its expansion coefficient is slightly higher than that of 4J32, but it has a higher upper limit of operating temperature. You need to choose according to the actual working temperature range, and our company (Liaocheng Jincheng Yangming Special Steel Co., Ltd.) can provide comparison data of the two grades to assist in decision-making.
- 2. What specific improvements does vacuum solution treatment bring to the performance of 1J22 soft magnetic alloy?
- Vacuum solution treatment can fully dissolve the carbides and impurity phases in the alloy to obtain a uniform single-phase structure, thereby improving the initial magnetic permeability and reducing the coercive force. At the same time, the vacuum environment can avoid oxidation and decarburization, ensuring the surface quality, which is crucial for the consistency of subsequent magnetic properties. Compared with non-vacuum smelting, the fluctuation of magnetic properties of the treated material can be reduced by more than 30%.
- 3. What grade can the dimensional tolerance of the customized bright round bar reach?
- The diameter tolerance of our customized bright round bars can be controlled within ISO h6 - h9 levels (depending on the diameter), the length tolerance is ±0.5mm, and the straightness is ≤0.5mm/m. The surface roughness can reach Ra ≤0.4μm (in the polished state). Special requirements can be negotiated, and high-precision ground bars are also supported.
- 4. Will the expansion coefficient of the Invar alloy bar change after welding?
- The heat-affected zone of welding will cause local changes in composition and structure, which may slightly increase the expansion coefficient (by about 10 - 20%). It is recommended to use a low-heat-input welding process and perform stress-relief annealing (about 500℃×2h) after welding to restore the low-expansion performance. Our company (Liaocheng Jincheng Yangming Special Steel Co., Ltd.) can provide welding process guidance documents.
- 5. Is 1J22 soft magnetic alloy suitable for high-frequency (>10kHz) working conditions?
- 1J22 has a relatively low resistivity (about 0.45μΩ·m), and the eddy current loss is large at high frequencies. If the working frequency exceeds 10kHz, it is recommended to choose thinner strips or iron-nickel soft magnetic alloys (such as 1J79, etc.). However, in low-frequency and high-current scenarios (such as power frequency transformers and DC motors), the high saturation magnetic induction of 1J22 has obvious advantages.
- 6. How does your company ensure the consistency of material performance between batches?
- We use the double process of vacuum melting + electroslag remelting, and fine-tune the composition before solution treatment. Each batch of materials is produced according to the same process parameters, and samples are retained for testing the expansion coefficient/magnetic properties. For key batches, third-party test reports can be provided (if commissioned by the user). We always rely on data.
- 7. Can Invar alloy rods be used in low-temperature environments (liquid nitrogen temperature)?
- 4J32 will gradually transform into a martensitic phase at low temperatures, resulting in an abnormally large expansion coefficient. Therefore, it is not recommended for use in environments below -100°C. For deep cryogenic applications, it is recommended to use Fe-Ni-Cr series Invar alloys (such as 4J42) or titanium alloys. If you need more information, we can provide specific working conditions to help you select the material.
- 8. What is the minimum order quantity for custom-made round bars?
- The minimum order quantity for a single specification of common grades such as 4J32 and 1J22 is 50kg. For special sizes or non-standard grades, negotiation is possible, with a minimum small-batch sample of 5kg. We support combined orders of multiple specifications to reduce your procurement costs. The delivery time is usually 10 - 15 working days.
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