Check out why we chose 316L S.S. over 304 S.S.
As the Gauge # gets smaller the steel gets thicker.
The difference between 304 and 316 Stainless Steel
This is with using sodium hydroxide.
and used 2-304 negative plates and 2-316 negative plates this was the result.
316-90,000 miles 10-15 amps
304-90,000 miles 10-15 amps
Grade 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments. It has excellent forming and welding characteristics. It is readily brake or roll formed into a variety of parts for applications in the industrial, architectural, and transportation fields. Grade 316 also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections.
Grade 316L, the low carbon version of 316 and is immune from sensitisation (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components (over about 6mm).
The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.
Other differences between 304 and 316
Types 316, 316L are molybdenum-bearing austenitic stainless steels which are more resistant to general corrosion and pitting/crevice corrosion than the conventional chromium-nickel austenitic stainless steels such as Type 304. These alloys also offer higher creep, stress-to-rupture and tensile strength at elevated temperature. In addition to excellent corrosion resistance and strength properties, the Types 316, 316L Cr-Ni-Mo alloys also provide the excellent fabricability and formability which are typical of the austenitic stainless steels. Applications for Types 316 and 316L alloys include acetic acid compounds, brandy vats, corn products refining equipment, fasteners, kettles for cooking ketchup, pharmaceutical processing equipment, phosphate industry parts, photographic film processing equipment, pitting-corrosion resistance, pulp and paper processing equipment, smokestacks, textile finishing equipment, textile mill kiers, water softener tanks, wire cloth and screens (industrial) and yeast tubes. Types 316, 316L.
RESISTANCE TO CORROSION
Excellent in a range of atmospheric environments and many corrosive media - generally more resistant than 304. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60�C. Considered resistant to potable water with up to about 1000mg/L chlorides at ambient temperatures, reducing to about 500mg/L at 60�C.
316 is usually regarded as the standard �marine grade stainless steel�, but it is not resistant to warm sea water. In many marine environments 316 does exhibit surface corrosion, usually visible as brown staining. This is particularly associated with crevices and rough surface finish.
It is common for 316 and 316L to be stocked in "Dual Certified" form - mainly in plate and pipe. These items have chemical and mechanical properties complying with both 316 and 316L specifications. Such dual certified product does not meet 316H specification and may be unacceptable for high temperature applications.
Source: Atlas Steels Australia
General Description By Grade
Test your stainless steel to see if you got the right stuff or ripped off?
(Molybdenum Spot Test (Mo))
Stainless steels which contain significant Molybdenum from those which do not.
The most common use is to sort 304 from 316
1. Clean the steel surface; use abrasive paper, and if necessary degrease and dry.
Avoid contact of test solution on skin, and particularly eyes. Wash off immediately if contacted. Reliable results only obtained if samples all the same temperature and freshly cleaned. Avoid very low sample temperatures. Some Heats of "Mo-free" stainless steels, such as 304, contain enough Mo to give a slight reaction. Standard comparison samples must be used.