302/304 Stainless Spring Wire
The most common corrosion-resistant spring-wire family for general industrial use.
Corrosion-Resistant Spring Alloys
Stainless Steel Spring Materials
Stainless spring grades for corrosion resistance, cleanliness, temperature capability and high-strength precision components.
MATERIAL FAMILY
- Grades covered
- 9
- Strength
- Medium to very high
- Corrosion
- High to very high
- Temperature
- Low to medium-high
- Conductivity
- Low
Grade Overview
Materials in This Family
Use this page to compare the role of each grade. Final wire size, strength condition, heat treatment and allowable stress are confirmed against the drawing and operating conditions.
316/316L Stainless Spring Wire
Molybdenum-bearing stainless steel with improved chloride and marine resistance.
301 Stainless Spring Strip
High work-hardening strip for flat springs, clips, constant-force and stamped parts.
17-7 PH Stainless Spring Steel
Precipitation-hardening stainless steel combining high strength and good fatigue performance.
17-4 PH Stainless Steel
High-strength corrosion-resistant alloy more common in flat, disc and machined elastic parts.
420 Stainless Spring Steel
Hardenable martensitic stainless family for wear-resistant clips, rings and spring parts.
321 Stainless Spring Wire
Titanium-stabilized stainless steel for elevated-temperature spring applications.
Duplex 2205 Spring Wire
High-strength duplex stainless steel for chloride, seawater and chemical environments.
Nitronic 50 / XM-19
High-nitrogen, low-magnetic stainless alloy with strong marine corrosion resistance.
Stainless Steel Selection Guide
How to Choose a Stainless Steel Spring Grade
There is no single “best” stainless steel for every spring. The right grade depends on the required spring form, stress level, cycle life, corrosion exposure, temperature, cleanliness requirements and available product form. For many general-purpose wire springs, 302/304 is the starting point. Chloride or marine exposure can push the selection toward 316/316L, while high-strength or high-cycle designs may justify 17-7 PH. Strip springs, severe chemical service and elevated-temperature applications can require a different grade entirely.
For product geometry and quotation requirements, see Variable-Diameter Compression Springs, English-Hook Extension Springs, Single-Leg Torsion Springs. These pages include reference configurations from this material family; confirm the exact grade for your project.
Grade Comparison
Compare Stainless Steel Spring Grades
Use this comparison for early material screening. Final suitability depends on product form, processing condition, spring geometry, operating stress and the actual environment.
| Grade | Best Fit | Corrosion | Strength / Fatigue Position | Temperature Position | Selection Note |
|---|---|---|---|---|---|
| 302/304 Stainless Spring WireASTM A313; EN 10270-3; ISO 6931-1; JIS G4314 | General compression, extension and torsion springs; food equipment; medical devices; electronics | Good to very good for general environments | Good spring strength after cold working | Low to medium service temperatures | A practical default when corrosion resistance is needed without moving to a premium alloy. |
| 316/316L Stainless Spring WireUNS S31600/S31603; ASTM A313/A580; EN 1.4401/1.4404 | Marine, food, pharmaceutical, medical and chemical environments | Higher resistance to pitting and crevice corrosion than 302/304 | Typically lower spring strength than the strongest precipitation-hardening grades | Low to medium service temperatures | Preferred when chloride exposure matters, but it is not immune to localized corrosion in severe chloride service. |
| 301 Stainless Spring StripUNS S30100; ASTM A666; EN 1.4310; JIS SUS301 | Flat springs, clips, stamped contacts, constant-force and formed strip components | Good general corrosion resistance | High strength through work hardening | Low to medium service temperatures | Especially useful for strip and stamped spring parts where high strength and formability are both required. |
| 17-7 PH Stainless Spring SteelUNS S17700; ASTM A313 wire; ASTM A693 strip; AMS specifications by product form | High-strength precision springs, aerospace, automotive, energy and demanding mechanisms | Good; often comparable with common 300-series grades in many environments | Very high after appropriate precipitation-hardening treatment | Medium to medium-high service temperatures | A strong candidate when 302/304 does not provide enough load capacity, fatigue margin or relaxation resistance. |
| 17-4 PH Stainless SteelUNS S17400; EN 1.4542; SUS630; standards vary by product form | Valves, energy equipment, aerospace hardware and high-strength elastic parts | Good general corrosion resistance | Very high after precipitation hardening | Medium service temperatures | More common in strip, plate, bar or machined elastic components than fine round spring wire; confirm available form before design release. |
| 420 Stainless Spring SteelUNS S42000; martensitic stainless family | Wear-resistant clips, rings, valve parts and industrial spring components | Moderate; below 300-series austenitic grades in many environments | High after hardening and tempering | Medium service temperatures | Useful where hardness and wear resistance matter more than maximum corrosion resistance. |
| 321 Stainless Spring WireUNS S32100; EN 1.4541; ASTM A313/A580; AMS by product form | Aerospace, oil & gas, energy and elevated-temperature equipment | Good general corrosion resistance | Moderate to high depending on condition and cold work | Medium to medium-high service temperatures | Titanium stabilization can make 321 useful where elevated-temperature exposure is part of the design requirement. |
| Duplex 2205 Spring WireUNS S32205/S31803; EN 1.4462; product-form standards must be confirmed | Seawater, desalination, oil & gas and chloride-rich chemical environments | Very high, including improved chloride stress-corrosion resistance versus common 300-series grades | High | Medium service temperatures | A specialized choice; wire availability, forming route and final heat treatment should be confirmed before committing the design. |
| Nitronic 50 / XM-19UNS S20910; product-form standards vary | Marine, oil & gas, food, chemical, pump and valve applications | Very high in many marine and chloride environments | High, with useful strength/corrosion balance | Medium service temperatures | A premium grade for demanding corrosion service where conventional 300-series stainless may not provide enough margin. |
Engineering Selection
Six Factors That Change the Stainless Steel Decision
Material selection depends on the complete spring system, not only the alloy name.
Start with the environment, not only the spring load
Humidity, washdown chemicals, salt spray, chlorides, sterilization cycles and process fluids can change the material decision. A spring that survives the mechanical load can still fail early if the environment promotes pitting, crevice corrosion or stress-corrosion cracking.
Separate wire-spring grades from strip and machined spring materials
Compression, extension and torsion springs normally begin with qualified spring wire. Flat springs, clips and stamped components may use strip grades such as 301 or precipitation-hardening sheet. Availability in the required wire, strip, plate or bar form must be checked before the drawing is finalized.
Strength and fatigue can justify moving beyond 302/304
For high stress, long cycle life or reduced spring envelope, 17-7 PH can provide a stronger design route when correctly processed. Material alone does not determine fatigue life: surface condition, spring index, residual stress, shot peening, set removal and operating stress range also matter.
316 improves chloride resistance, but it is not a universal marine solution
The molybdenum addition in 316/316L improves resistance to localized corrosion compared with 302/304. Severe seawater, stagnant chloride exposure, high temperature or aggressive chemicals may still require duplex stainless, Nitronic 50 or a nickel-based alloy after application review.
Temperature changes both alloy choice and spring behavior
At elevated temperature, relaxation and loss of load can become more important than room-temperature tensile strength. 321 or precipitation-hardening stainless may extend the useful range, while severe high-temperature service can justify INCONEL or another nickel alloy.
Magnetic response should be specified when it matters
Austenitic stainless steels are often selected for low magnetic response, but cold working can change magnetic behavior. Medical, sensor, instrument or magnetic-field applications should specify the actual magnetic requirement instead of assuming every stainless spring is non-magnetic.
Fast Selection
Which Stainless Steel Option Should You Start With?
Use the operating condition as the first filter, then confirm the exact grade and material condition against the drawing.
| Design Condition | Starting Recommendation | Why |
|---|---|---|
| General corrosion resistance + common wire springs | Start with 302/304 spring wire | Broad availability, good spring performance and practical cost. |
| Marine, salt spray or chloride exposure | Evaluate 316/316L first | Better pitting and crevice-corrosion resistance than 302/304. |
| High strength / demanding fatigue / compact design | Evaluate 17-7 PH | Precipitation hardening can provide a stronger spring material after the correct treatment. |
| Flat spring, clip or stamped elastic part | Evaluate 301 strip or 17-7 PH strip | Product form and work-hardening response suit many stamped spring components. |
| Wear resistance more important than maximum corrosion resistance | Evaluate 420 stainless | Martensitic grades can be hardened for wear and contact applications. |
| Elevated-temperature stainless application | Evaluate 321 or 17-7 PH | Both can be more suitable than a general 300-series choice depending on stress and exposure. |
| Severe seawater / chloride / chemical service | Evaluate Duplex 2205 or Nitronic 50 | Higher corrosion margin, but sourcing and process capability must be confirmed. |
Compare Alternatives
Compare Other Spring Material Families
The right material family depends on the complete balance of strength, environment, temperature, conductivity, weight and cost.
Carbon & Alloy Spring Steels
Consider these when maximum cost efficiency, high strength and fatigue performance matter more than bare corrosion resistance.
Compare this family →Nickel & High-Temperature Alloys
Consider INCONEL and related alloys for severe temperature, stress-relaxation or aggressive chemical service.
Compare this family →Copper Alloy Spring Materials
Consider copper alloys when electrical conductivity, low magnetic response or contact performance is a primary requirement.
Compare this family →Related Spring Products
These product pages include reference configurations from this material family. Review the geometry, then confirm the exact grade, dimensions and working loads during quotation.
- Variable-Diameter Compression Springs30 material-family reference configurations
- English-Hook Extension Springs18 material-family reference configurations
- Single-Leg Torsion Springs11 material-family reference configurations
- Wire-Formed Components10 material-family reference configurations
- Tower-Shaped Compression Springs26 material-family reference configurations
- Conical Compression Springs23 material-family reference configurations
Related Material Engineering Guides
Compare material and dimensional reference data for the spring types used in your assembly.
- 301 Stainless Steel Compression Springs Reference DataMaterial and dimensional reference data
- 301 Stainless Steel Extension Springs Reference DataMaterial and dimensional reference data
- 301 Stainless Steel Torsion Springs Reference DataMaterial and dimensional reference data
- 301 Stainless Steel Wire Forms Reference DataMaterial and dimensional reference data
- 301/304 Stainless Steel Spring Material Reference DataMaterial and dimensional reference data
- 304 Stainless Steel Compression Springs Reference DataMaterial and dimensional reference data
RFQ Preparation
Information That Helps Us Select the Right Stainless Steel Grade
A material callout alone is not enough for a reliable custom spring quotation. These details let engineering review the alloy together with geometry and working conditions.
- Spring type or part drawing
- Wire, strip or other required material form
- Outside/inside diameter, free length and working envelope
- Required load at defined height or deflection
- Cycle-life target and whether the load is static or dynamic
- Operating temperature range
- Exposure to water, salt, chemicals, cleaning or sterilization
- Magnetic, conductivity, cleanliness or regulatory requirements
- Required finish, passivation or surface treatment
- Annual quantity, prototype quantity and destination market
FAQ
Stainless Steel Spring Material Questions
Is 304 stainless steel the best general-purpose spring material?
It is one of the most common starting points for corrosion-resistant spring wire, but the best choice depends on environment, stress, cycle life, temperature and product form. 316 or 17-7 PH can be more appropriate when corrosion or strength requirements increase.
Should I choose 304 or 316 for a spring?
Choose based on exposure rather than name recognition. 316 generally provides better resistance to chloride-driven pitting and crevice corrosion. 304/302 can be more economical and widely available for general environments.
When is 17-7 PH better than 304?
17-7 PH is often considered when higher strength, fatigue margin, relaxation resistance or a smaller spring envelope is required. The heat-treatment route and final condition must be controlled.
Are stainless steel springs non-magnetic?
Not always. Austenitic grades can have low magnetic response in the annealed condition, but cold working can increase magnetic response. Martensitic grades such as 420 are magnetic. Specify the actual magnetic requirement when it is critical.
Can 316 stainless steel be used in seawater?
316 offers better chloride resistance than 302/304, but it can still pit or crevice-corrode in severe seawater conditions. Duplex 2205, Nitronic 50 or nickel alloys may be evaluated when the corrosion margin is critical.
Selection Logic
Choose the Grade After Defining the Application
Material selection should follow the required load, motion, cycle life, temperature, corrosion exposure, conductivity or magnetic requirements and the available spring envelope. A familiar alloy is not automatically the best spring material for every mechanism.
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