Product Specification

SUS 302/304 Soap-Coated Stainless Steel Spring Wire, 0.25–18mm

Product Overview

The SUS 302/304 Soap-Coated Stainless Steel Spring Wire is stainless steel wire designed for spring manufacturing and selected wire-forming applications. It is available in diameters from 0.15mm to 12mm, with material grade, wire condition and surface finish selected according to the customer's application and processing requirements.

The primary surface option for this product is soap coated. The coating provides a lubricated surface condition that can be considered for downstream wire forming and spring coiling processes.

Both SUS 302 and SUS 304 can be specified where applicable. The appropriate grade should be selected according to the required material properties, forming process, operating environment and applicable standard.

Product Specifications

SUS 302 vs. SUS 304 Stainless Steel Spring Wire

Material grade is one of the first factors to consider when selecting stainless steel spring wire.

SUS 302

SUS 302 is an austenitic stainless steel grade commonly used for stainless steel spring wire. Its work-hardening characteristics make it suitable for selected cold-drawn wire and spring applications.

SUS 304

SUS 304 is another widely used austenitic stainless steel grade for wire products and industrial forming applications.

The choice between SUS 302 and SUS 304 should be based on the required material specification, mechanical condition, forming process and operating environment.

For a specific order, the exact grade should be confirmed before production.

0.15–12mm Diameter Range

The 0.15–12mm diameter range covers fine wire through larger stainless steel wire sizes.

Different wire diameters are used for different spring geometries and forming requirements. Therefore, diameter selection should be based on the finished component rather than simply choosing the largest available size.

Important parameters may include:

• Wire diameter

• Diameter tolerance

• Spring diameter

• Working load

• Spring deflection

• Number of coils

• Forming method

• Required mechanical condition

For custom requirements, the customer's drawing or technical specification can be used to determine the appropriate wire diameter and tolerance.

Soap-Coated Surface

The soap-coated surface is intended for applications where a lubricated wire condition is useful during subsequent processing.

For spring manufacturing and wire forming, surface condition can affect the interaction between the wire and forming equipment. Soap coating can therefore be selected when the production process requires surface lubrication.

The actual coating specification should be matched to the customer's forming equipment, processing method and subsequent cleaning or finishing requirements.

A bright surface can also be discussed when a clean metallic surface is required instead of a soap-coated finish.

Cold-Drawn Manufacturing Process

The wire is produced through a cold-drawing process to achieve the required wire diameter and material condition.

For spring wire, production control should focus on measurable characteristics such as:

• Diameter

• Diameter tolerance

• Tensile strength

• Surface condition

• Coil dimensions

• Material grade

• Material traceability

The final wire condition should be selected according to the customer's required mechanical specification rather than using one fixed property for all diameters.

Typical Applications

Spring Manufacturing

SUS 302/304 stainless steel wire can be used for selected spring applications when the material grade, diameter and mechanical condition match the finished spring design.

Typical spring types include:

• Compression springs

• Extension springs

• Torsion springs

• Small formed springs

• Industrial spring components

Wire Forming

The wire can be processed into formed-wire components where a defined stainless steel grade, diameter and surface condition are required.

Industrial Components

Selected wire sizes can be used for industrial formed components depending on the required material specification and manufacturing process.

Custom Wire Applications

The broad 0.15–12mm diameter range allows buyers to discuss alternative wire sizes according to their drawings, production equipment and application requirements.

Product Advantages

Wide Diameter Coverage

The 0.15–12mm range provides multiple wire diameter options for different spring and forming applications.

SUS 302 and SUS 304 Options

The availability of both material grades allows buyers to select the appropriate stainless steel specification according to the application and required material properties.

Soap-Coated Surface

The soap-coated finish provides a lubricated wire condition for selected downstream forming and spring-coiling processes.

Bright Surface Option

Bright surface can be discussed for applications where a clean metallic surface is required or where soap coating is not needed.

Flexible Packaging

The wire can be supplied in coils or spools with plates, with coil dimensions and packaging configuration confirmed according to the customer's handling and processing requirements.

Surface Selection Guide

Surface should be selected according to the downstream production process rather than treating one finish as universally better.

Quality Control

For stainless steel spring wire, product quality should be evaluated through measurable specifications.

Recommended inspection items include:

• Stainless steel grade

• Chemical composition

• Wire diameter

• Diameter tolerance

• Tensile strength

• Surface condition

• Coil dimensions

• Coil or spool weight

• Material traceability

• Packaging condition

• Inspection documentation

For spring applications involving repeated loading, the finished spring should be evaluated according to its actual geometry, working load, deflection and operating conditions.

How to Select SUS 302/304 Spring Wire

1. Select the Material Grade

Specify SUS 302 or SUS 304 according to the required material standard and application.

2. Confirm the Diameter

Provide the required wire diameter and tolerance. The available range is approximately 0.15–12mm.

3. Select the Surface

Choose soap coated when the production process requires a lubricated wire condition. Bright surface can be discussed for alternative processing requirements.

4. Confirm the Mechanical Condition

Provide the required tensile strength, hardness or other mechanical specifications where applicable.

5. Specify the Application

Indicate whether the wire will be used for compression springs, extension springs, torsion springs, wire forms or another component.

6. Confirm Packaging

Specify coil or spool packaging and any required coil dimensions according to the customer's production equipment.

Ordering Information

For technical evaluation, buyers are recommended to provide:

• Material: SUS 302 or SUS 304

• Diameter: 0.15–12mm

• Diameter tolerance

• Surface: Soap Coated or Bright

• Required tensile strength or hardness

• Application

• Required quantity

• Coil or spool requirement

• Applicable standard

• Inspection or certification requirements

Providing these details allows the wire specification to be matched more closely to the customer's manufacturing process.

FAQ

What is SUS 302/304 stainless steel spring wire?

It is stainless steel spring wire available in SUS 302 or SUS 304 grades, with diameters from approximately 0.15mm to 12mm and a soap-coated surface option.

What is the purpose of soap coating on spring wire?

Soap coating provides a lubricated surface condition for selected downstream forming and spring-coiling processes.

What diameters are available?

The product range covers approximately 0.15–12mm. The exact diameter and tolerance should be confirmed according to the customer's drawing or specification.

What is the difference between SUS 302 and SUS 304 spring wire?

Both are austenitic stainless steel grades, but the material grade should be selected according to the required material specification, mechanical condition, forming process and application.

Can bright stainless steel spring wire be supplied?

Yes. Bright surface is available as an alternative surface condition where soap coating is not required.

What information is needed for a spring wire inquiry?

The key information includes material grade, diameter, tolerance, surface, mechanical condition, application, quantity, packaging and applicable material standard.