Differences in chemical composition between 430 and 304 stainless steel.
430 stainless steel is a US standard stainless steel material grade, which is a low-carbon, high-chromium ferritic steel and belongs to the 400 series stainless steel.
304 stainless steel is a US standard stainless steel material grade, which is chromium-nickel austenitic steel and a common type of 300 series stainless steel.
According to the US standard “ASTM A240/A240M-15a Specification for Chromium and Chromium-nickel Stainless Steel Plates, Sheets and Strips for Pressure Vessels and General Purposes”, the carbon content of 430 stainless steel should be less than 0.12%, the chromium content should be between 16-18%, and the nickel content should be less than 0.75%.
The difference between 430 stainless steel and 304 stainless steel is mainly in the nickel content.
| UNS | Grade | C | Mn | P | S | Si | Cr | Ni |
|---|---|---|---|---|---|---|---|---|
| S43000 | 430 | 0.12 | 1.00 | 0.04 | 0.03 | 1 | 16-18 | 0.75 |
| S30400 | 304 | 0.07 | 2.00 | 0.045 | 0.03 | 0.75 | 17.5-19.5 | 80-10.5 |
Differences in mechanical properties between 430 and 304 stainless steel
430 stainless steel is a ferritic stainless steel that can be slightly strengthened by cold working, but has poor low-temperature toughness and generally cannot be hardened by heat treatment.
304 stainless steel has good plasticity and toughness. Deformation at room temperature or slightly higher temperatures will increase strength and reduce elongation. Annealed austenitic stainless steel (such as 304 stainless steel) maintains high impact resistance, even at cryogenic temperatures. This property is combined with its low-temperature strength and machinability.
Yield strength, tensile strength, elongation, and hardness are four parameter indicators for measuring the mechanical properties of stainless steel materials.
Comparison table of mechanical properties:sus 430 vs 304 stainless steel:
| UNS | Grade | Yield Strength(Mpa) | Tensile Strength(Mpa) | Elongation | HBW | HRBW |
|---|---|---|---|---|---|---|
| S43000 | 430 | 205 | 450 | 22 | 183 | 89 |
| S30400 | 304 | 205 | 515 | 40 | 201 | 92 |
1.General properties of stainless steel type 430: 430 stainless steel is a low-C ferritic stainless steel. Its corrosion resistance in a mildly corrosive environment or atmosphere is similar to that of some Ni (nickel) stainless steels, and it is resistant to oxidation at high temperatures. 430 steel is ductile, not easy to work harden, and can be formed by many roll forming, or low tensile bending methods, as well as more commonly used drawing and bending processes.
2. Stainless steel grades 430: When the temperature is below about 1650°F (about 899 degrees Celsius), these alloys are ferrites with irregular spherical carbide diffusion.
When heated above 1650°F, a small amount of austenite is formed at the grain boundaries and within the grains. Whether these austenites transform into martensite or ferrite and carbides depends on the cooling rate. Martensite may be found in the heat-affected zone of the weld zone and the parent metal, which will transform into ferrite and carbides after annealing.
3. 430 ss application: 430 stainless steel can be used for various internal and external decorations. In such scenarios, corrosion resistance is much more important than strength. Typical uses are sinks and edges, appliance decorations, upper and lower covers, etc.
Learn more about stainless steel through the official website of walmay metal :https://walmaysteel.com/.
