UNS S31803 vs SS 316 Stainless Steel – What’s the Difference

When it comes to choosing the right stainless steel material for a particular application, one of the most common choices is between SS 316 and UNS S31803. Both materials have similar properties, but there are also some key differences that should be taken into account when making a decision. Let's take a closer look at both materials to see how they stack up against each other.

Difference Between SS 316 and UNS S31803

The primary difference between SS 316 and UNS S31803 is their composition. SS 316 contains iron, chromium, molybdenum, nickel, and manganese, whereas UNS S31803 contains iron, chromium, molybdenum, nickel, nitrogen, manganese, and copper. This means that UNS S31803 has higher levels of corrosion resistance than SS 316 due to its additional components.

When it comes to strength, both materials are fairly similar in terms of the tensile strength (the maximum amount of force that can be applied without breaking the metal). However, UNS S31803 does have a slightly higher yield strength (the amount of force required to cause permanent deformation) than SS 316. This means that it is more resistant to deformation under stress.

In terms of cost-effectiveness, both materials are relatively affordable compared to other stainless steel grades; however, UNS S31803 is typically more expensive than SS 316 due to its additional components, which increase its corrosion resistance and strength.

Composition

The major difference between SS 316 and UNS S31803 stainless steel is their chemical composition. SS 316 contains 16% chromium, 10% nickel, and 2% molybdenum. UNS S31803 stainless steel, on the other hand, contains 18% chromium, 14% nickel, and 3% molybdenum.

Corrosion Resistance

Both SS 316 and UNS S31803 stainless steel offers excellent corrosion resistance. However, UNS S31803 stainless steel is superior in this regard, as it is more resistant to pitting and crevice corrosion than SS 316.

Strength

SS 316 is stronger than UNS S31803 stainless steel, as it has a higher carbon content. This makes it ideal for applications where strength is important, such as in marine environments or in construction.

Temperature Resistance

SS 316 is also better suited for high-temperature applications than UNS S31803 stainless steel. It can withstand temperatures up to 1500 degrees Fahrenheit without losing its strength or becoming brittle.

Cost

SS 316 is typically more expensive than UNS S31803 stainless steel due to its higher chromium and molybdenum content. However, the two materials are often priced similarly in the market.

Conclusion:

When it comes to choosing between SS 316 and UNS S31803 stainless steel materials for an application, there are several factors that must be taken into consideration, including composition, strength characteristics and cost-effectiveness. In general, though, UNS S31803 tends to offer superior performance in terms of corrosion resistance and strength while still being reasonably priced compared to other stainless steel grades. Ultimately though, it will depend on the specific requirements of your application as to whether or not either material is suitable for your needs. If you're in doubt about which one would work best for you, then consulting with an experienced professional can help you make the right decision for your project.