Description

Corrosion-resistant soft magnetic alloys (1J17, 1J18, 1J36) offer high saturation induction, low remanence, and excellent corrosion resistance. Ideal for marine, aerospace, and chemical processing applications. GB/T 14986-94 compliant.

Corrosion-Resistant Soft Magnetic Alloys | 1J17, 1J18 & 1J36

1J17, 1J18 and 1J36 are corrosion-resistant soft magnetic alloys designed for magnetic components operating in demanding environments where magnetic performance, corrosion resistance, high saturation induction and low remanence are important.

These specialized magnetic materials are used in selected solenoid valves, electromagnetic control systems, precision magnetic circuits, sensors and other components exposed to moisture, corrosive media or demanding operating conditions.

Greenergy Materials supplies soft magnetic alloy materials in customized grades, dimensions, product forms and delivery conditions according to customer specifications.

What Are Corrosion-Resistant Soft Magnetic Alloys?

Corrosion-resistant soft magnetic alloys combine the magnetic characteristics required for easy magnetization and demagnetization with improved resistance to environmental attack.

Compared with conventional soft magnetic materials, corrosion-resistant grades can be considered when the magnetic component is exposed to:

• Water vapor

• Humid environments

• Salt spray

• Corrosive media

• Chemical processing environments

• Temperature and pressure variations

The 1J17, 1J18 and 1J36 grades belong to specialized soft magnetic alloy families with different alloy compositions and magnetic characteristics.

The appropriate grade should therefore be selected according to the actual operating environment, magnetic requirements, mechanical requirements and applicable material specification.

1J17, 1J18 & 1J36 Alloy Overview

The exact application should be confirmed according to the required magnetic properties, environmental conditions and material standard.

1J17 Soft Magnetic Alloy

1J17 is a chromium-containing iron-based soft magnetic alloy developed for applications where corrosion resistance and magnetic performance are both important.

The alloy contains approximately 15.5–16.5% chromium, with iron as the balance. Publicly available technical tables also specify controlled levels of carbon, manganese, silicon, phosphorus and sulfur.

Key Characteristics

• Chromium-containing Fe-based alloy

• Corrosion-resistant material system

• Soft magnetic behavior

• Suitable for selected magnetic control components

• Suitable for applications requiring improved environmental resistance

When selecting 1J17, magnetic performance should be evaluated together with the required corrosion environment and component geometry.

1J18 Soft Magnetic Alloy

1J18 is a chromium-containing soft magnetic alloy with titanium addition.

Public technical composition data identify approximately 17–18.5% chromium, 0.5–0.7% nickel and 0.3–0.7% titanium, with iron as the balance.

The controlled alloy composition provides a combination of corrosion resistance and soft magnetic behavior for specialized magnetic components.

Potential Selection Advantages

• Corrosion-resistant alloy system

• Fe-Cr based soft magnetic material

• Titanium-containing composition

• Suitable for selected precision magnetic components

• Designed for applications where environmental resistance matters

The actual magnetic properties depend on alloy condition, processing history, heat treatment and test method.

1J36 Soft Magnetic Alloy

1J36 is an iron-nickel soft magnetic alloy containing approximately 35–37% nickel.

It is commonly associated with applications requiring a combination of corrosion resistance, high saturation magnetic induction and low residual magnetic induction.

This makes 1J36 particularly relevant to magnetic components operating in demanding environments.

Key Characteristics

• Fe-Ni soft magnetic alloy

• Approximately 35–37% nickel

• High saturation magnetic induction

• Low remanence

• Corrosion resistance

• Suitable for selected electromagnetic control applications

High Saturation Magnetic Induction

High saturation magnetic induction is important when a magnetic component needs to operate effectively under relatively strong magnetic excitation without reaching magnetic saturation too early.

For applications such as electromagnetic actuators and solenoid valves, saturation behavior can directly affect:

• Magnetic force

• Actuation performance

• Core size

• Electromagnetic efficiency

• Control response

1J36 is particularly relevant when high saturation magnetic induction is required together with corrosion resistance and low remanence.

Low Remanence and Low Residual Magnetism

Remanence, also called residual magnetic induction, describes the magnetic induction remaining in a material after the external magnetizing field is removed.

Low remanence can be beneficial in electromagnetic devices that need:

• Reliable release

• Fast magnetic response

• Reduced residual magnetic force

• Stable repeated switching

• Consistent electromagnetic control

For this reason, low-remanence soft magnetic alloys can be advantageous in solenoid and electromagnetic control applications.

Corrosion Resistance in Soft Magnetic Components

Corrosion can be particularly problematic in magnetic components because surface degradation may affect both mechanical dimensions and magnetic performance.

Depending on the application, corrosion resistance can help improve material suitability in environments involving:

Water Vapor

Moisture can cause oxidation and surface degradation in conventional magnetic materials.

Salt Spray

Salt-containing environments can accelerate corrosion and may require specialized material selection.

Chemical Media

Certain control systems expose magnetic components to chemical or process media.

Temperature and Pressure

Solenoid valves and electromagnetic control systems may operate under combined temperature, pressure and environmental stresses.

Material selection should therefore consider both the magnetic circuit and the surrounding environment.

1J17 vs 1J18 vs 1J36

The final grade should be selected according to the required magnetic performance and operating environment rather than corrosion resistance alone.

Chemical Composition

Representative composition ranges from publicly available technical tables are shown below.

These values should be treated as reference composition ranges. The material supplied by Greenergy Materials should be controlled according to the agreed specification, applicable standard and inspection requirements. Public technical tables report these ranges for the respective grades.

Magnetic Properties

Magnetic performance depends on:

• Alloy grade

• Chemical composition

• Strip or sheet thickness

• Heat treatment

• Cold working

• Grain structure

• Test field

• Measurement method

Relevant parameters may include:

• Saturation magnetic induction

• Remanent magnetic induction

• Coercive force

• Initial permeability

• Maximum permeability

• Magnetic loss

• Magnetic stability

For procurement projects, the required magnetic test conditions should be specified together with the material grade.

Greenergy Materials recommends using actual batch test data or agreed specification values rather than generic magnetic-property numbers when evaluating production material.

Applications of Corrosion-Resistant Soft Magnetic Alloys

Solenoid Valves

One of the most important application areas for corrosion-resistant soft magnetic alloys is electromagnetic solenoid valves.

The magnetic core of a solenoid valve must generate sufficient magnetic force while operating reliably in its surrounding environment.

1J36 has been associated with solenoid valve production for control systems operating under conditions involving media, temperature and pressure.

Potential applications include:

• Industrial solenoid valves

• Fluid control systems

• Gas control systems

• Hydraulic control systems

• Pneumatic control systems

• Electromagnetic actuators

Electromagnetic Control Systems

Corrosion-resistant soft magnetic alloys can be used in selected:

• Magnetic actuators

• Electromagnetic switches

• Control valves

• Magnetic relays

• Electromagnetic mechanisms

Low remanence can be particularly valuable when the device must repeatedly magnetize and release.

Sensors and Precision Magnetic Components

Selected grades can also be considered for:

• Magnetic sensors

• Precision magnetic circuits

• Electromagnetic control components

• Instrument components

• Magnetic shielding components

The appropriate material should be selected based on magnetic sensitivity, corrosion environment and mechanical requirements.

Material Forms

Depending on the alloy grade and production requirements, materials may be supplied in forms such as:

• Cold-rolled strip

• Precision strip

• Sheet

• Coil

• Custom-cut material

• Other forms subject to technical confirmation

For electromagnetic components, thickness and dimensional tolerance should be specified together with magnetic requirements.

Thickness and Dimensional Control

For precision magnetic components, material thickness can influence:

• Magnetic response

• Eddy-current behavior

• Heat-treatment response

• Component dimensions

• Stamping performance

• Assembly accuracy

Procurement specifications should therefore define:

• Thickness

• Width

• Thickness tolerance

• Width tolerance

• Flatness

• Surface condition

• Edge condition

• Delivery state

Heat Treatment and Magnetic Performance

Heat treatment can significantly affect the magnetic performance of soft magnetic alloys.

Cold working and residual stress can alter:

• Magnetic permeability

• Coercive force

• Remanence

• Magnetic loss

• Magnetic stability

For this reason, the required heat-treatment condition should be specified according to the final application.

Greenergy Materials can evaluate the appropriate material condition according to the customer's magnetic and mechanical requirements.

Quality Control

A reliable corrosion-resistant soft magnetic alloy supply program should evaluate more than chemical composition.

Chemical Composition

Verify the required alloying elements and impurity limits.

Magnetic Properties

Depending on the specification:

• Saturation induction

• Remanence

• Coercive force

• Initial permeability

• Maximum permeability

Dimensional Inspection

Check:

• Thickness

• Width

• Tolerance

• Flatness

• Surface condition

Mechanical Testing

Depending on application:

• Hardness

• Tensile strength

• Elongation

• Corrosion / Surface Evaluation

Where corrosion resistance is a critical requirement, the appropriate corrosion or environmental test method should be agreed before production.

This is particularly important because "corrosion resistant" is application-dependent and should not be interpreted as universal resistance to every chemical environment.

How to Choose Between 1J17, 1J18 and 1J36

Use the following selection process.

Step 1: Define the Environment

Determine whether the component will encounter:

• Moisture

• Water vapor

• Salt spray

• Chemical media

• High temperature

• Pressure

Step 2: Define Magnetic Requirements

Identify the required:

• Saturation induction

• Remanence

• Coercive force

• Permeability

• Magnetic loss

Step 3: Define the Component

Determine whether the alloy will be used for:

• Solenoid valve core

• Magnetic actuator

• Sensor

• Relay

• Magnetic circuit

• Precision instrument

Step 4: Define Dimensions

Specify:

• Strip thickness

• Strip width

• Sheet dimensions

• Tolerances

Step 5: Define Delivery Condition

Specify:

• Cold rolled

• Annealed

• Heat treated

• Surface condition

Step 6: Confirm the Applicable Standard

Do not select a grade based solely on an old supplier catalog.

Confirm:

• Current applicable standard

• Grade designation

• Product form

• Magnetic test method

• Mechanical requirements

• Environmental requirements

1J36 vs Conventional Soft Magnetic Alloys

When choosing a magnetic material for a corrosive environment, conventional high-permeability alloys may not always be the best solution.

A material such as 1J36 may be preferable when the application requires a combination of:

corrosion resistance + high saturation induction + low remanence + soft magnetic behavior.

By contrast, if the primary objective is extremely high initial permeability, other Fe-Ni alloys such as 1J79 and 1J85 may be more appropriate.

Corrosion-Resistant vs High-Permeability Soft Magnetic Alloys

Custom Corrosion-Resistant Soft Magnetic Alloy Supply

Greenergy Materials can evaluate customized requirements for:

• 1J17

• 1J18

• 1J36

• Strip

• Sheet

• Coil

• Custom dimensions

• Specific magnetic properties

• Specific heat-treatment conditions

• Customized inspection requirements

For a technical quotation, provide:

Alloy Grade + Product Form + Thickness + Width + Quantity + Application + Magnetic Requirements + Operating Environment

Our team can help determine the appropriate soft magnetic alloy according to the application.

Technical Documentation

For qualified projects, technical documentation may include:

• Chemical composition

• Material specification

• Magnetic-property data

• Mechanical-property data

• Dimensional inspection

• Surface inspection

• Material test report

• Packaging information

• Shipping documentation

The exact documents supplied depend on the agreed product specification.

Frequently Asked Questions

What is a corrosion-resistant soft magnetic alloy?

It is a soft magnetic material designed to maintain useful magnetic performance while providing improved resistance to environmental corrosion compared with conventional magnetic materials.

What is 1J36 used for?

1J36 is associated with corrosion-resistant soft magnetic applications requiring high saturation magnetic induction and low residual magnetic induction. Solenoid valves are an important application area reported for this grade.

What is the difference between 1J17 and 1J18?

Both are chromium-containing Fe-based soft magnetic alloys, but 1J18 contains nickel and titanium in addition to chromium. Their exact magnetic and environmental performance should be evaluated according to the applicable material specification.

Is 1J36 a nickel-iron soft magnetic alloy?

Yes. 1J36 is an Fe-Ni soft magnetic alloy with approximately 35–37% nickel according to commonly published composition data.

Why is low remanence important?

Low remanence reduces residual magnetism after the external magnetic field is removed. This can be beneficial in electromagnetic actuators, valves and switching components that require reliable release.

Are these alloys suitable for solenoid valves?

Yes. Corrosion-resistant soft magnetic alloys, particularly 1J36, are associated with solenoid valve applications in control systems exposed to demanding environmental conditions.

Can Greenergy supply customized dimensions?

Yes. Customized strip, sheet and other material dimensions can be evaluated according to grade, application and production requirements.

Can Greenergy provide magnetic test data?

Technical and inspection data can be provided according to the agreed material specification and order requirements.

Request a Quote

Looking for 1J17, 1J18 or 1J36 corrosion-resistant soft magnetic alloy?

Send us your:

Grade + Dimensions + Quantity + Application + Magnetic Requirements + Operating Environment

Greenergy Materials can help evaluate the appropriate material grade and supply specification for your magnetic component.

Contact us for technical support, material selection and quotation.