Grade 430
Ferritic stainless · AISI 430 / SAE 51430, UNS S43000, EN 1.4016
Type 430 Ferritic Stainless Steel (17% Chrome), ferritic stainless steel.
Data sheet
| Designations | AISI 430 / SAE 51430 · UNS S43000 · EN 1.4016 (X6Cr17) |
|---|---|
| Standards | ASTM A240, ASTM A276, EN 10088-2 |
Metallurgy
Reference data for Type 430 Ferritic Stainless Steel (17% Chrome), against ASTM A240, ASTM A276, EN 10088-2.
Elemental composition
X6Cr17 to 1.4016
- Chromium 17,00%16,00–18,00%
- Nickel 0,35%max 0,75%
- Carbon 0,060%max 0,12%
- Other additions 1,04%Mn, Si, P, S
- Iron 81,56%Balance
Proportions use the normalised midpoint of each specified range. The midpoint is a derived figure, not something the standard states: read the table for what is actually specified.
Performance profile
Comparative scores out of ten, for weighing one grade against another
These are relative ratings, not measured properties, and they carry no units. Use them to narrow a shortlist, then work from the specified values.
Composition as specified
| Element | Specified | Nominal |
|---|---|---|
| Iron Fe | Balance | 81,56% |
| Carbon C | max 0,12%cap | 0,060% |
| Chromium Cr | 16,00–18,00% | 17,00% |
| Nickel Ni | max 0,75%cap | 0,35% |
| Manganese Mn | max 1,00%cap | 0,50% |
| Silicon Si | max 1,00%cap | 0,50% |
| Phosphorus P | max 0,040%cap | 0,020% |
| Sulphur S | max 0,030%cap | 0,015% |
A cap is a ceiling, not a quantity: a heat may contain far less. The nominal column is the midpoint of each range, used for the chart's proportions only.
Mechanical and physical properties
| Property | Value |
|---|---|
| Tensile strength, ultimate | 450 MPa65,3 ksi |
| Yield strength, 0,2% offset | 260 MPa37,7 ksi |
| Elongation at break | 22% |
| Hardness | 160 HBW / 85 HRB |
| Modulus of elasticity | 200 GPa29 Mpsi |
| Density | 7,75 g/cm³0,28 lb/in³ |
| Thermal conductivity | 26,1 W/(m·K)181 BTU·in/(hr·ft²·°F) |
| Thermal expansion | 10,4 µm/(m·K)5,8 µin/(in·°F) |
Test condition not yet confirmed. These figures are typical values for the grade; the condition a bar was supplied in changes them materially, so ask us for the mill certificate before designing to a number.
Pitting resistance
PREN 17
Cr + 3,3 Mo + 16 N, across the full specified composition
- Freshwater0–20
- Brackish20–32
- Seawater32–40
- Extreme offshoreover 40
A standard states its elements as ranges, so a grade has a window rather than a single score. The bar is that window; the tick is the midpoint.
Corrosion and fabrication
Chloride and marine service
Moderate atmospheric resistance; not recommended for outdoor marine exposure due to staining/pitting.
Acidic and chemical media
Resistant to nitric acid (HNO3) and mild organic acids; widely used in chemical equipment handling nitric acid.
Sensitisation and thermal behaviour
Susceptible to sensitization in weld HAZ due to grain boundary chromium carbide precipitation; requires post-weld annealing.
Welding
Fair; HAZ exhibits grain coarsening and room-temperature embrittlement; preheat to 150°C–200°C recommended.
Machining and cold forming
Machinability index 55% relative to AISI 1212. Good bending and roll forming; lower stretch formability than 304 due to lower work hardening coefficient.
Where it is used
- Dishwasher interior liners and clothes dryer drums
- Refrigerator cabinet panels and appliance trims
- Automotive decorative trim and wheel covers
- Nitric acid plant absorber towers and storage tanks
Appliances · Automotive · Chemical Processing · Architecture (Interior)
Performance scores in full
The same six scores the profile plots, as numbers.
| Property | 430 |
|---|---|
| Corrosion resistance | 6.8 / 10 |
| Weldability | 6 / 10 |
| High-temperature resistance | 7 / 10 |
| Tensile strength | 5.4 / 10 |
| Cold formability | 6.8 / 10 |
| Machinability | 6.2 / 10 |
This page is guidance for selecting a grade, not a specification. Design to the governing standard and the mill certificate for the heat you are supplied.
The specifications and data on this site are provided for general information only. Verify any real-world project with a qualified metallurgist before relying on these figures. We take no responsibility for the use and application of this information.