Alloy 46 Nickel Iron Bar（UNS K4600，ASTM F30）

Product Introduction

When you are responsible for procuring Alloy 46 (UNS K4600, ASTM F30)nickel-iron bars, it means your project is entering the field of precision instruments or special motors that require precise electromagnetic properties.

Most importantly, this material offers a significant cost advantage, with a nickel content of approximately 46%, making its raw material cost far lower than that of the permalloy series with nickel content above 70%. Its performance, however, depends on the heat treatment process; its soft magnetic properties need to be fully realised through proper hydrogen or vacuum annealing. The condition of the bars you purchase is crucial.

Mastering Pricing and Negotiation Techniques:

Price drivers generally include the price of nickel (the main cost). The diameter accuracy, surface finish, and testing requirements of the rods also affect the price. Our negotiation focus should be on "guaranteeing and verifying magnetic performance data," rather than simply competing on unit price. Based on past customer requirements, we usually specify a minimum order quantity (MOQ) for the first order: typically measured in kilograms or by minimum diameter (e.g., test samples: 30-50/kg).

Typical Application Scenarios

(Determining Your Procurement Direction):

Precision Solenoid Valves: Valve cores and electromagnet pole pieces require fast response and high holding force.

Relays and Contactors: Magnetic circuit components require good magnetic permeability and sufficient strength.

Small Special Motors: Certain stator or rotor laminations, especially in applications requiring high efficiency and compact design.

Magnetic Shielding: Shielding covers and housings are used to shield against low-frequency interference.

Inductor and Transformer Cores: Suitable for applications with medium magnetic field strength and requiring high saturation magnetic flux density.

Key Point: If your customer is an "electromagnetic device designer" or "motor engineer," they will value its excellent magnetic properties in the medium magnetic field range of 2000-5000 A/m, as well as its lower material cost compared to high-nickel permalloy.

Procurement Specifications and Industry Standards

Based on our past successful experience procuring alloy 46 bar, your inquiry must go beyond the norm and directly address the core performance requirements. The following points should be emphasised before communicating with the supplier:

1. Determining Material Grade and Standard:

We commonly use the most reliable method to identify materials, directly using the manufacturer's trade name, such as "Carpenter 46 Alloy" or "Hitachi Metals 46Ni-Fe". Alternatively, a general description can be used: "46% Ni-Fe soft magnetic alloy with chemical composition and properties equivalent to Carpenter 46 Alloy." Specifications (UNS K4600, ASTM F30)

2. Providing Accurate Specifications and Conditions (Critical Requirements):

Based on material characteristics, we typically offer stock specifications with diameters ranging from Ф4mm to Ф600mm, with custom lengths. We provide basic and precision machining services to meet customer application needs. Precise diameter and tolerance (e.g., Φ20mm h11) and length (fixed or variable) must be confirmed.

"Fixed" Delivery Condition: This must be clearly specified, as it will affect performance. For example:

Cold Drawn + Bright Annealed - This is the recommended condition for optimal soft magnetic properties.

Hot Rolled + Annealed - Suitable for large-sized bars.

3. Core Performance Requirements (Technical Agreement Core):

Magnetic properties must be quantified: "In the final delivery condition, tested using a toroidal sample, the saturation magnetic induction (Bs @ 800 A/m) ≥ 1.48 T, and the maximum permeability (μm) ≥ 25,000."

Chemical Composition Window: Specifically specify the control range for nickel (Ni) content (e.g., 45.5-46.5%).

4. Special Requirements:

Ultrasonic Testing: 100% UT testing is recommended for critical application bars to ensure no internal defects.

Surface Quality: Requires no scale, no deep machining marks or cracks. A bright surface is preferred.

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Processing difficulty and key points

(understanding the reasons for high prices)

Compared to high-nickel permalloy, Alloy 46 offers better machinability and less tool wear, but still requires the use of sharp carbide tools and ample cooling. Whether purchasing raw materials, machining simple parts, or precision-machined parts, the following points should be noted by skilled machining personnel regarding secondary processing:

Heat Treatment is Crucial: To achieve optimal soft magnetic properties, high-temperature annealing at over 850°C in pure hydrogen or a high vacuum, followed by slow cooling, is essential. This is a critical step for relieving stress, reducing coercivity, and improving permeability. The supplier should be able to provide heat treatment recommendations.

Welding Requires Caution: Welding severely degrades the magnetic properties in the heat-affected zone. If welding is necessary, a complete stress-relief annealing process must be performed after welding, but this may not fully restore optimal performance. Welding should be avoided in the design whenever possible.

One-Stop Procurement Recommendation: If your ultimate need is for finished magnetic cores or electromagnetic components, consider sourcing finished parts directly from a professional magnetic materials processor. We handle the entire process from raw materials to finished products (machining, heat treatment, testing), ensuring better control over the final performance.

For more information, please contact:

 Email: susan@lorkgroup.com
 WhatsApp: +86 19937075488

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