316
Typical reasons to choose 316
Process equipment, chemical handling, food and pharmaceutical fabrication, marine-adjacent service within defined limits.
Stainless steel grade comparison
316 vs 430 Stainless Steel
Compare 316 and 430 stainless steel by chemistry, microstructure, corrosion resistance, fabrication, product form, governing standard and procurement priorities.
Quick answer: Choose 316 when corrosion resistance, welded fabrication and chloride exposure control the design. Choose 430 for cost-conscious, mildly corrosive indoor applications where ferritic magnetic behavior and lower thermal expansion are acceptable.
The alloying and microstructure difference behind the selection decision
316
EN 1.4401 · UNS S31600- C0.04%
- Cr17.2%
- Ni10.1%
- Mo2.1%
430
EN 1.4016 · UNS S43000- C0.05%
- Cr16.2%
- Ni—
- Mo—
Technical basis: Outokumpu Supra 316/4401 and Moda 430/4016 reference material. Final composition and properties must follow the applicable specification and mill test certificate.
M03 · Decision summary
316 or 430: which one should you specify?
This is an austenitic-versus-ferritic decision. Alloy cost, magnetism, corrosion environment, joining route and thermal movement should all be reviewed together.
| Decision factor | 316 stainless steel | 430 stainless steel | |
|---|---|---|---|
| Corrosion resistance | 316 — Austenitic Cr-Ni-Mo | 430 — Ferritic chromium stainless steel | Service environment controls the decision. |
| Welding and fabrication | State thickness, weld route and required corrosion performance. | State thickness, weld route and required corrosion performance. | Do not use grade name alone. |
| Magnetic behavior | Confirm delivery condition and cold-work exposure. | Confirm delivery condition and cold-work exposure. | Microstructure can matter to the design. |
| Supply condition | Define product form, finish, dimensions and certificate scope. | Define product form, finish, dimensions and certificate scope. | Quote to the finished requirement. |
| Selection priority | Process equipment, chemical handling, food and pharmaceutical fabrication, marine-adjacent service within defined limits. | Kitchen equipment, household appliances, sinks and other mildly corrosive indoor applications. | Start from service evidence, not price alone. |
430 is not a direct substitute when 316 was specified for chlorides, aggressive chemicals or demanding welded fabrication.
M04 · Technical data
316 vs 430 Stainless Steel properties
Typical chemistry is shown as an engineering reference. Mechanical properties must be compared only under the same product standard and delivery condition.
Typical chemical composition
Reference values by mass, not guaranteed purchase limits.
| Element / indicator | 316 | 430 | Selection significance |
|---|---|---|---|
| C | 0.04% | 0.05% | Confirm final chemistry against the governing material standard and MTC. |
| Cr | 17.2% | 16.2% | Confirm final chemistry against the governing material standard and MTC. |
| Ni | 10.1% | — | Confirm final chemistry against the governing material standard and MTC. |
| Mo | 2.1% | — | Molybdenum materially changes localized-corrosion performance. |
Material and fabrication behavior
Use these points to frame a condition-specific technical review.
| Property | 316 | 430 | Procurement interpretation |
|---|---|---|---|
| Microstructure | Austenitic Cr-Ni-Mo | Ferritic chromium stainless steel | Defines the main fabrication and service behavior. |
| Heat treatment | Specify delivery condition; this comparison does not imply a hardening route. | Specify delivery condition; this comparison does not imply a hardening route. | Confirm finished property requirements. |
| General fabrication | Use the applicable welding/forming procedure. | Use the applicable welding/forming procedure. | Process route matters as much as grade. |
| Corrosion review | Define chlorides, chemicals, temperature, deposits and crevices. | Define chlorides, chemicals, temperature, deposits and crevices. | Higher-alloy review may be required. |
Engineering caution: 430 is not a direct substitute when 316 was specified for chlorides, aggressive chemicals or demanding welded fabrication.
M05 · Product form matrix
Product forms and supply routes for 316 and 430
Both grades can be supplied in common stainless product forms, but availability, finish and certification are product-specific. Confirm the exact grade and delivery condition in the RFQ.
RFQ rule: grade, product form, dimensions, tolerance, finish, governing standard, quantity, destination and certificate scope.
| Product form / route | 316 | 430 | Procurement note |
|---|---|---|---|
| Cold-rolled coil, strip and sheet | Common route | Common route | Confirm thickness, width, finish and edge. |
| Plate and fabricated components | Available | Available | State fabrication and inspection requirements. |
| Bar / mechanical component | Program dependent | Program dependent | Use the correct long-product standard and condition. |
| Welded fabrication | Procedure review | Procedure review | State joint design, filler, post-weld treatment and service. |
M06 · Grade selector
Screen 316 and 430 against the service conditions
This is a preliminary routing tool, not a substitute for governing specification review.
Preliminary result
Define the controlling requirement
Select the conditions that apply to your component.
Send conditions to an engineer01Define environment
02Define fabrication
03Define final condition
04Confirm standard
M08 · Applications & limitations
Where 316 works, where 430 is justified, and where a further review is needed
The relevant choice is the one that meets the finished-component and service requirement with defined specification evidence.
430
Typical reasons to choose 430
Kitchen equipment, household appliances, sinks and other mildly corrosive indoor applications.
Review
Conditions needing a different alloy review
430 is not a direct substitute when 316 was specified for chlorides, aggressive chemicals or demanding welded fabrication.
Fabrication and service comparison
Use these points to define the RFQ.
| Requirement | 316 | 430 | Selection effect |
|---|---|---|---|
| Corrosion resistance | 316 — Austenitic Cr-Ni-Mo | 430 — Ferritic chromium stainless steel | Service environment controls the decision. |
| Welding and fabrication | State thickness, weld route and required corrosion performance. | State thickness, weld route and required corrosion performance. | Do not use grade name alone. |
| Magnetic behavior | Confirm delivery condition and cold-work exposure. | Confirm delivery condition and cold-work exposure. | Microstructure can matter to the design. |
| Supply condition | Define product form, finish, dimensions and certificate scope. | Define product form, finish, dimensions and certificate scope. | Quote to the finished requirement. |
| Selection priority | Process equipment, chemical handling, food and pharmaceutical fabrication, marine-adjacent service within defined limits. | Kitchen equipment, household appliances, sinks and other mildly corrosive indoor applications. | Start from service evidence, not price alone. |
Important: 430 is not a direct substitute when 316 was specified for chlorides, aggressive chemicals or demanding welded fabrication.
Material image comparison
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Use an approved product-form or surface-detail image.
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Use an approved product-form or application image.
M10 · Standards & equivalence
316 and 430 stainless steel grade designations
316 and 430 are different stainless steel families. Confirm corrosion exposure, fabrication route and governing product standard before purchase.
| Designation / standard | 316 | 430 | Procurement caveat |
|---|---|---|---|
| ASTM / AISI type | 316 | 430 | Use the exact grade identity. |
| UNS | S31600 | S43000 | Use UNS where grade identity matters. |
| EN material number | 1.4401 | 1.4016 | These are distinct European material routes. |
| Alloy family | Cr-Ni-Mo austenitic | Chromium ferritic | Nickel, molybdenum and microstructure drive performance. |
| Typical product route | A240 / A276 as applicable | A240 / A268 as applicable | Confirm product form, condition and current revision. |
| EN grade name | X5CrNiMo17-12-2 | X6Cr17 | Austenitic 316 and ferritic 430 have different microstructure and alloying. |
| JIS reference | SUS316 | SUS430 | Confirm the governing JIS product standard and exact chemistry. |
| ASTM / ASME flat-product route | ASTM A240 / ASME SA-240 where applicable | ASTM A240 / ASME SA-240 where applicable | Confirm thickness range, finish and current edition. |
| ASTM long-product route | ASTM A276 as applicable | ASTM A268 / A276 as applicable | Bar, billet, forging and pressure-service requirements are product-specific. |
| EN flat-product reference | EN 10088-2 where applicable | EN 10088-2 where applicable | Use the exact delivery condition and product form. |
| EN long-product reference | EN 10088-3 where applicable | EN 10088-3 where applicable | Long-product properties must be checked separately from flat-product data. |
| Material certificate | EN 10204 3.1 when specified | EN 10204 3.1 when specified | State certificate, testing and traceability requirements in the RFQ. |
| Delivery condition | 316: commonly solution annealed; state finish and dimensions. | 430: state annealed condition, finish and formed/welded condition. | Do not assume a common condition across forms, dimensions or suppliers. |
| Selection input | State corrosion exposure, formed/welded fabrication and magnetic requirement. | Use the governing specification for final acceptance. | |
316 · S31600Molybdenum-alloyed austenitic stainless steel.
316 · 1.4401Common EN 316 material designation.
430 · S43000Chromium ferritic stainless steel.
430 · 1.4016Common EN ferritic material designation.
Grade equivalence is not permission to substitute. Confirm chemistry, product form, dimensions, finish, delivery condition, standard revision and mill test certificate before changing material.
M11 · Direct answers
316 vs 430 Stainless Steel FAQ
Answers to the main purchasing and engineering questions behind this comparison.
What is the main difference between 316 and 430 stainless steel?
This is an austenitic-versus-ferritic decision. Alloy cost, magnetism, corrosion environment, joining route and thermal movement should all be reviewed together.
Which grade has the stronger corrosion-resistance starting point?
316 is a molybdenum-alloyed austenitic grade with a higher corrosion-resistance margin. 430 is a ferritic, nickel-free grade for milder service and is normally magnetic.
What should be included in an RFQ for this comparison?
State grade, product form, dimensions, finish, standard, quantity, service environment, weld route and required certificate or inspection level.
Can one grade replace the other simply to reduce cost?
No. A grade change can alter corrosion resistance, fabrication behavior, magnetic response, heat treatment and certification requirements. Compare the finished component and actual service.
When should a higher-alloy stainless steel be reviewed?
430 is not a direct substitute when 316 was specified for chlorides, aggressive chemicals or demanding welded fabrication.
M13 · Sources & technical review
Technical basis for this 316 vs 430 comparison
This page distinguishes manufacturer typical chemistry from final purchase specification. It does not make a live-inventory or fixed-price claim.
Primary technical references
- Outokumpu product-range informationOutokumpu Supra 316/4401 and Moda 430/4016 reference material.
- ASTM A240/A240MCommon flat-product specification family; confirm the applicable edition and delivery condition.
- EN 10088 seriesEuropean stainless-steel designation and product-condition reference.
- Mill test certificateFinal chemistry and properties must be confirmed against the supplied heat and purchase specification.
Page accountability
AuthorStainless Steel Market technical content team
Material-selection and procurement guidance for buyer review.
Technical reviewSupplier confirmation required for final acceptance
Confirm product form, standard, condition and MTC for each enquiry.
Review date24 September 2026
Checked against current manufacturer reference material.
Update log
2026-09-24 — Initial T09 comparison prepared with technical tables, selector, FAQ and RFQ routing.
M14 · Ask an engineer
Still deciding between 316 and 430?
Send the product form, service environment, fabrication route, dimensions and governing specification for a condition-specific material review.
- 316, 430 or alternative grade under consideration
- Product form, dimensions, tolerance and finish
- Chlorides, chemicals, temperature and cleaning conditions
- Welding, forming, machining and final condition
- Required standard, MTC, inspection and destination
- Quantity, timing and commercial requirements
Send your material requirement
For a useful review, include product form, dimensions, service conditions, fabrication route, required standard, quantity and documentation needs.