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304 vs 316 stainless steel

When first discussing the differences between 304 stainless steel and 316 steel we must first understand what stainless steel is.  Stainless steel is always made using chromium. The minimum amount of chromium used to make stainless steel is 10.5%; it is chromium that makes the steel stainless. Chromium also improves the corrosion resistance by forming a chromium oxide film on the steel. This very thin layer, when placed under the right conditions, can also be self-repairing.

Other elements used to make stainless steel as well, including nickel, nitrogen and molybdenum. Bringing these elements together forms different crystal structures that enable a variety of properties in machining, welding and forming.

There are four major types of stainless steel.  The first and most widely used is austenitic  It has a nickel content of at least 7%, which makes it very flexible. It is used in a range of houseware products, industrial piping and vessels, constructional structures and architectural facades.

Ferritic stainless steel has similar properties to mild steel, but better corrosion resistance. This type of steel is commonly used in washing machines, boilers and indoor architecture. Martensitic stainless steel is a very hard, strong steel. It contains around 13% chromium and is used to make knives and turbine blades.

Finally, there is also a duplex stainless steel that is a composite of austenitic and ferritic steels. This steel is both strong and flexible. Duplex steels are most commonly used in the paper, pulp and shipbuilding industries. They are also widely used in the petrochemical industry.

Grade 304 is the standard "18/8" stainless; it is the most versatile and most widely used stainless steel, available in a wider range of products including stainless steel tables, cabinets and more , forms and finishes than any other. It has excellent forming and welding characteristics. The balanced austenitic structure of Grade 304 enables it to be severely deep drawn without intermediate annealing, which has made this grade dominant in the manufacture of drawn stainless parts such as sinks, hollow-ware and saucepans. Grade 304 is readily brake or roll formed into a variety of components for applications in the industrial, architectural, and transportation fields. Grade 304 also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections.

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.

About the Author

Pearce Stainless is a Canadian manufacturer of custom stainless steel cleanroom products including cabinets, tables & stainless steel clean room equipment for controlled environments.

I have a 420 gallon stainless steel tank that I want to sell. Where are the best places to sell such an item?

I am looking for the best places to sell a 420 gallon stainless steel tank. The tank itself is in excellent condition. I was given a value of $1500.00 for the tank from an online consultant. But I don't know where or who would buy such an item. I especially don't want to sell it for much less than it worth. It's all about finding the right buyer, right? So any suggestions will be greatly appreciated!

That sounds pretty cool. $1500 bucks sounds like a good deal on a stainless steel tank that big. What did you use it for or intend to use it for? I'm tempted to jump on it for that price. Don't know what I'd use it for or where I'd put it...

Looks like you could try eBay... Just make the minimum bid what you'd be willing to accept. List it as pickup only... or figure out how to ship it and what it would cost... http://search.ebay.com/search/search.dll?from=R40&_trksid=m37&satitle=stainless+steel+tank&category0=

Reelcraft Introduces New Stainless Steel Cord Reel
Reelcraft's stainless steel cord reel is designed for applications where corrosion or sanitation are a concern. Heavy gauge 304L stainless steel provides an excellent finish and superior corrosion resistance. Compact and easy to install, the reel includes a 4-5' pigtail, multi-positional guide arm, automatic on/off switch on the reel and a spot light suitable for class 1 and 2 hazardous areas ...

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