Freezer on top or bottom?

[PsychoAndy]

Originally posted by: lowtech

A trick I picked up when I go restaruant equipment shopping with dad is to take a good refrigerator magnet along. Low grade SS sticks easily, higher grade SS wont hold unless you get a horeshoe AlNiCo magnet. You can test this on fryers, ovens, stoves, tables, sinks, et al.

Chromium is the main ingredient that makes stainless steel stainless, and chromium happened to be highly magnetic. There are many composites of stainless steel for different purposes therefore no one quality is better than the next.

DAVE WRIGHT WELDING - Stainless Steel.

What Is Stainless Steel and Why Is it Stainless?

After reading your first link and seeing this:

NICKEL CONTAINING:
When nickel is added and the chromium level is increased, the structure changes again and it is called "Austenitic" and they have the following characteristics:

Are NOT magnetic
CANNOT be hardened by "heat treatment" BUT CAN be hardened by cold working
Have the "BEST" corrosion resistance
Can be easily welded
Have excellent cleanability and hygiene characteristics
Have exceptional resistance to both high and low temperature
Common Uses:

Kitchen sinks
Architectural applications such as roofs and gutters, doors and windows, tubular frames
Food processing equipment
Restaurant food preparation areas
Chemical vessels
Ovens
Heat exchangers
Common Grades:
Stainless is designated by three different systems

Metallurgical structure - Austenitic
Grade: 304 (most used), 310 (for high temperature), 316 (for better corrosion resistance), 317 (for best corrosion resistance)
Unified Numbering System UNS: S30400, S31000, S31600, S31700 (Note chemistry and properties given for 304 and 316)
Some Limitations:
Austenitic stainless steels have some limitations:

The maximum temperature under oxidizing conditions is 925ºC (see heat resisting stainless steels)
They are suitable only for low concentrations of reducing acid (Super Austenitics are available for higher acid levels)
In cervices and shielded areas, there might not be enough oxygen to maintain the passive oxide film and crevice corrosion might occur (Super Austenitics, Duplex and Super Ferritic are available in these situations)
Very high levels of halide ions, especially the chloride ion can also breakdown the passive surface film
(Super Austenitics and Duplex are available to withstand these conditions)

Information on Super Ferritic and Super Austenitic material is available from the list of Stainless Producers.

I should elaborate. High quality in what I regard it as is not rusting and longevity. I've seen some "stainless steel" tables rust just because the conglomeration of the metals was not as good as say, our sink. In most kitchen applications you want something that will last and wont rust, so I arbitrarily "grade" SS a little differently than say, a $6 door hinge.

For the same reason 18/8 (8% nickel) SS silverware is harder to corrode than 18/0. The metal is made to resist corroding and when something dosent rust, you dont have to replace it.

-PAB

 

[PsychoAndy]

Originally posted by: McPhreak
I got one of these sub-zero fridges...pretty nice.

I would have to cast my vote for a bottom freezer as well. You don't go into your freezer as often as the fridge and for anyone else out there who's had a frozen turkey or any other large frozen object (those cornish game hens are murder) land on their feet, it makes much more sense to put the freezer lower to the ground to minimize acceleration due to certain gravitational forces...

How much did that run ya?

-PAB

 

[lowtech1]

After reading your first link and seeing this:

NICKEL CONTAINING:
When nickel is added and the chromium level is increased, the structure changes again and it is called "Austenitic" and they have the following characteristics:

Are NOT magnetic
CANNOT be hardened by "heat treatment" BUT CAN be hardened by cold working
Have the "BEST" corrosion resistance
Can be easily welded
Have excellent cleanability and hygiene characteristics
Have exceptional resistance to both high and low temperature

?In cervices and shielded areas, there might not be enough oxygen to maintain the passive oxide film and crevice corrosion might occur (Super Austenitics, Duplex and Super Ferritic are available in these situations) Very high levels of halide ions, especially the chloride ion can also breakdown the passive surface film?

You might want to check out why Duplex & Super Ferrictic stainless is superior against corrosion in crevices & is use for "Food pickling plants & cooking utensils" in the rest of the article. And, the article also forgot to mention that nickle have a negative affect when use in high amount, such as the material has to be thicker & is more prone to cracking.

Like I have said befor "There are many composites of stainless steel for different purposes therefore no one quality is better than the next." each have their own purpose.