Mirror Precision Stainless Steel Cold Rolled
The 430 grade is a stainless steel best suited for mild corrosive environments. For more aggressive environments, it might be better recommended to choose a 300 series stainless like 304 of 316L . Without Molybdenum or Nickel additions, 430 stainless steel is significantly less expensive 316. This makes 430 stainless steel a good value choice for non-critical indoor environments. In elevated temperatures, 430 stainless steel offers good resistance to oxidation as well.
430 stainless steel does have its drawbacks. It becomes brittle in cryogenic temperatures, a side-effect of its ferritic crystal structure. It is also not as easy to form and weld as the 300-series grades, but still has good drawdown facility. Galling is a possibility whenever it is machined, and the cutting edges can become extremely hot due to 430's low thermal conductivity. Plenty of coolant is required while machining stainless steel 430.
Stainless Steel Propertie
As ferritic steels go, 430 stainless steel is the most common. It is used in a variety of applications, mostly indoors. Its high chromium content offers great corrosion resistance, especially under normal atmospheric conditions. It is able to form passivated chromium oxide barriers, which are both tough and durable. And its high chromium content allows the 430 grade to self-renew this thin protective layer particularly fast.
430 stainless steel resists chloride-induced stress corrosion cracking better than many ferritic steels. It also holds up well against corrosion in the presence of dilute organic acids and many alkalis. This makes stainless steel 430 ideal for use in kitchen applications, such as utensils and working areas. It has also been shown to resist nitric acid well, making it suitable for certain chemical applications.
As-welded 430 stainless steel is not suited for robust applications, embrittlement in the heat affected zone is a risk. At elevated temperatures, pitting and crevassing of 430 grade surfaces can occur. especially in low PH conditions.
Nominal Composition
| C: | 0.12 max |
| Mn: | 1.0 max |
| P: | 0.040 max |
| S: | 0.030 max |
| Si: | 1.00 max |
| Cr: | 16.0 – 18.0 |
| Ni: | .75 max |
| N: | – |
| Fe: | BAL |
Physical Properties
Density
0.28 lb./in3 / (7.74 g/cm3)
Modulus of Elasticity (E)
29 x 103 ksi / (200 x 103MPa)
Coefficient of Expansion
5.8 x 10-6 microinches/in.-°F (70-600°F) / (10.4 μm/m-°C) (20-300°C)
Electrical Resistivity
23.68 μ ohm.in / (60 μ ohm.cm)
Thermal Conductivity
15.1 Btu-in./ft.2hr.-°F / (26.1 W/m-K)
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