304 vrs 316 stainless

[jibes138]

MECHANICAL PROPERTIES OF TYPE 304 AT ROOM TEMPERATURE
Typical Mechanical Properties required for annealed material covered by ASTM A240.
Yield Strength .2% offset = 30,000 / Ultimate Tensile Strength = 80,000 / Elongation = 50%. Hardness R = 90 max.
MECHANICAL PROPERTIES OF TYPE 316 AT ROOM TEMPERATURE
Typical Mechanical Properties required for annealed material covered by ASTM-A240. Yield Strength .2% offset = 30,000 / Ultimate Tensile Strength = 80,000 / Elongation = 50%. Hardness R = 90 max.
TYPE 316 STAINLESS STEEL
Type 316 is an austenitic chromium-nickel stainless and heat-resisting steel with superior corrosion resistance as compared to other chromium-nickel steels when exposed to many types of chemical corrodents such as sea water, brine solutions, and the like.

 

[dscribner]

304 & 316 share most of the same characteristics. same yield strength, 25000 PSI. 304 is a touch harder, but not much. But 316 is more corrosion RESISTANT than 304. The hardness may explain a little bit about the difference in galling but I would be surprised if that was true.

Any time you have a question about materials, go to McMaster-Carr. Search for "Stainless Steel" (in this case). Near the top of the page you see "About Stainless Steel". This opens up a page showing all sorts of information on the material. I've used this for years in engineering as a quick reference for designing with stainless, aluminum, rubber, plastic, copper, brass. All sorts of things. The information isn't textbook gospel but it can help you make a more educated decision on the materials and fasteners that you are considering.

https://www.mcmaster.com/#standard-stainless-steel-rods/=15w9e81