Qualities of 316 vs. 316L Stainless Steel
316 and 316L stainless steel alloys are both marine-grade steels, but they do possess some key differences. 316L has a lower proportion of carbon in its composition. To qualify as 316L stainless steel, the amount of carbon cannot exceed 0.03%. This decreases the risk of carbon precipitation, making it a better option for welding to ensure maximum corrosion resistance.

316 stainless steel has a mid-range level of carbon and contains between 2% and 3% molybdenum, which increases resistance to corrosion, acidic elements, and high temperatures. Both materials have excellent malleability, meaning they perform well in bending, stretching, deep drawing, and spinning.

How to Choose Between 316 or 316L Stainless Steel
When determining whether to use 316 or 316L stainless steel for your application, it is important to consider the following factors:

Corrosion Resistance
316L is the superior choice for high-corrosion and high-temperature applications. Since 316L contains less carbon than 316, it has better intergranular corrosion resistance, meaning its welds won’t decay, unlike with 316 stainless steel.

Magnetic Properties
316 stainless steel has very low responsiveness to magnetic fields. Unlike basic stainless steels, which are ferromagnetic, most stainless steel varieties (including 316) are austenitic — or effectively nonmagnetic.

However, some 316 stainless steel goods can undergo processes, like cold forming and welding, where the austenitic crystal structure is transformed into ferromagnetic martensite. 316L steel is more susceptible to gaining some degree of magnetism.

Key Difference

The key difference between 316 and 316L stainless steel is the carbon content. While 316 has a maximum carbon content of 0.08%, 316L has a maximum carbon content of only 0.03%.

Practical Applications
Both types of stainless steel are useful in a wide variety of industries. However, 316 is primarily used in construction and infrastructure because it is strong, resistant to pitting, and corrosion resistant in most circumstances. 316L is popular for pharmaceutical and photography equipment because it can withstand welding and corrosive chemicals.

TYPICAL APPLICATIONS

Material: Stainless Steel

Dimensions:

OD 3mm - 460mm

75mm to 460mm

Finish: Mill

Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes. There is no representation that the recipient of this literature will receive updated editions as they become available.