430 Stainless Steel - Magnetic Grade

 

Composition and Structure

430 stainless steel is a ferritic stainless steel, meaning it has a body-centered cubic (BCC) crystal structure. Unlike austenitic grades such as 304 or 316, it does not contain nickel as a major alloying element. Instead, it is primarily composed of:

Chromium (16–18%) – Provides corrosion resistance and scale resistance.

Carbon (≤0.12%) – Kept low to maintain ductility and toughness.

Iron (balance) – The base metal of the alloy.

Minor elements – Such as manganese, silicon, phosphorus, and sulfur, which contribute to strength, machinability, and other characteristics.

The absence of nickel is one of the key reasons why 430 stainless steel is less expensive than common austenitic grades.

Key Properties

Corrosion Resistance

430 stainless steel offers good resistance to atmospheric corrosion, mild chemicals, and oxidation at elevated temperatures. While not as corrosion-resistant as 304 or 316, it performs well in indoor environments and moderate outdoor conditions. However, it is not recommended for highly corrosive settings, such as marine or acidic environments.

Mechanical Properties

Tensile Strength: ~450 MPa

Yield Strength: ~205 MPa

Elongation at Break: ~22%

Hardness: ~HRB 89

These values make 430 stainless steel suitable for applications requiring moderate strength and good formability.