Selection summary
Overview
430 is a nickel-lean ferritic stainless used for appliances, interior trim, equipment panels, and other sheet applications where moderate corrosion resistance, magnetic response, and cost control are valued. It is less formable and generally less corrosion-resistant than 304 in demanding service.
This page separates standard-oriented limits from typical reference data. Purchase acceptance comes from the ordered specification and certified material test report.
Names and systems
Identity & standards
Similar designations across ASTM, EN, JIS, and other systems are not automatically interchangeable. Product form and ordered standard control chemistry, properties, dimensions, condition, and testing.
Reference chemistry
Composition
| Element | Reference range | Why it matters |
|---|---|---|
| Carbon | ≤ 0.12% | Controlled for ductility and corrosion behavior |
| Chromium | 16.0–18.0% | Passive-film and oxidation resistance |
| Nickel | ≤ 0.75% | Residual limit; grade is ferritic |
Concise grade-family reference only. Confirm every element limit against the current standard for the exact product ordered.
Condition matters
Reference properties
Annealed flat product; verify ordered standard
Annealed flat product; verify ordered standard
Typical room-temperature reference
Environment first
Corrosion behavior
Useful in indoor and mildly corrosive environments with appropriate finish and cleaning.
Lower resistance than 304 to many wet, chloride, and industrial environments.
Temperature, concentration, deposits, crevices, stress, surface finish, cleaning, and fabrication quality can change service performance.
Service limits
Temperature & service
Prolonged intermediate-temperature exposure can embrittle ferritic stainless steels.
Delivery condition
Heat treatment & condition
430 is annealed to restore ductility and a ferritic structure after processing; it cannot be hardened by conventional quench-and-temper heat treatment.
Prolonged exposure in embrittling temperature ranges and excessive grain growth can reduce toughness, especially in weldments and heavy sections.
Process route
Fabrication
Good sheet-forming capability for moderate draws; severe forming needs grade and texture review.
Thin sections can be welded, but grain growth and toughness require more care than 304.
Magnetic response: Ferromagnetic.
Decision boundaries
Comparisons & substitution
430 is magnetic and nickel-lean, but it is not a drop-in replacement for 304 where deep drawing, weld toughness, or broader corrosion resistance governs.
Stabilized ferritic grades such as 439 or 441 can be more suitable for welded and thermally cycled components.
Where it is used
Applications
Ordering scope
Product forms & standards
Cold-rolled sheet and strip for formed, appliance, and decorative components.
Hot-rolled flat product and bar where the applicable product standard includes 430.
Welded tube for suitable mild environments, with weld quality and forming requirements stated.
Decision support
Selection guidance
Choose this grade when
- Magnetic ferritic sheet and cost control are desired in mild service.
- Decorative finish and oxidation resistance matter more than deep fabrication.
Review another grade when
- Complex deep drawing or heavy welded sections are required.
- Exposure is coastal, chloride-rich, or continuously wet.
Before ordering
Procurement checklist
Name the governing product standard, edition, dimensions, tolerances, edge, finish, and delivery condition.
Require the exact UNS designation and a material test report; a familiar trade name alone is not an acceptance criterion.
Confirm corrosion environment, design temperature, fabrication route, inspection, certification, marking, and packaging before order release.
Traceable evidence