202 Stainless Steel: Economy with Adequate Performance

 

What's distinctive about 202's chemical makeup?​

202 contains 17-19% chromium, 4-6% nickel, and 7.5-10% manganese. The higher manganese compensates for lower nickel, reducing cost while maintaining some austenitic properties. It has low carbon, around 0.15% max, to aid formability.​

 

How does 202 perform in terms of corrosion resistance?​

It offers fair corrosion resistance in dry indoor environments and mild outdoor settings. However, it's less resistant to moisture and salt than 304, making it unsuitable for coastal or high-humidity areas. It can rust if exposed to harsh chemicals or prolonged wetness.​

 

What are its mechanical properties and formability?​

202 has moderate strength, with tensile strength around 515 MPa, similar to 304 but slightly lower. It's reasonably formable, allowing for bending and basic fabrication, though not as ductile as 304 for complex shapes. It work-hardens moderately during cold working.​

 

How does 202 compare to 304 in cost and use cases?​

202 is 15-20% cheaper than 304 due to lower nickel content. It's used in decorative items, furniture, and non-critical structural parts where cost matters more than maximum corrosion resistance. 304 remains better for food contact or harsh environments.​

 

What should be noted about 202's limitations?​

Avoid using 202 in marine, food processing, or chemical handling applications. It's prone to pitting in chloride-rich environments and can't withstand high heat as well as 304. Proper maintenance, like regular cleaning, helps extend its lifespan in suitable uses.