Hi Dameon Bill and list,
Daemon has concerns about the boiling pot in the Sears distiller
being stainless steel and Bill replys to test it with a magnet.
Lets review some basic metallurgy.
Stainless steels differ from carbon steels principally in having
higher thermal expansion, reduced heat conductivity, greater electric
resistivity,lower melting point,AND increased corrosion resistance.
There are three classes of stainless steel, called
FERRITIC,MARTENSITIC,and AUSTENITIC.
The first is an alloy of iron and chromium, which cannot be heat
treated. The second is also an alloy of iron and chromium,but can be
hardened by heat treatment. The third types are commonly alloys of
iron,chromium,and nickel,the most familiar alloy being 0.08% carbon (C)
,18% chromium (Cr), and 8% nickel (Ni),with a slight trace of manganese
(Mn) and silicon (Si),type 302 and 304 stainless steels.This third type
cannot be hardened by the usual heat treatment.
All of the stainless steels may be given special purpose properties by
adding small percentages of other metals such as copper (Cu),molybdenum
(Mo),titanium (Ti),columbium (Nb niobium),selenium (Se),and sulfur (S).
The three classifications are determined by the relationship between
the percentage of carbon and chromium in the steel. Stainless steels are
really corrosion and scale resistant steels.
Most stainless steel sinks will show small rust spots if left wet,but
will clean up very easy like new. Only a very few alloys are stainless
in the strict sense of the word,they are really called corrosion and
scale resistant. The corrosion resistance obtained with the use of
chromium is derived both from its inherent ability to resist corrosion
and from the ability to form a protective film of chromium oxide.
The martensitic types are what we find in cooking pots and pans and
stainless things around the house. Its called the 400 series of
stainless steels. The 410 stainless is a low cost general purpose
steel.The 440 stainless is used for cutlery and hunting knifes.440C is
used for ball bearings.
Martensitic stainless is magnetic in that a magnet will adhire to it.
Place a *refigerator* magnet on the the metal,if it sticks its a 400
series stainless. Leave some water in it over night,if it shows no rust
its stainless.Try scratching it,if its very hard and no shavings came
off of it,its stainless. Best bet is its a 410 grade stainless steel.
Steels with nickel,austenitic, repel magnetic lines of force or conduct
them thru the metal so completely that no lines of force appear on the
other side of the metal,Mumetal(a magnetic shield) is 77% nickel and not
even referred to as a steel,Monel(very corrsion resistant) is 67%
nickel.Inconel is 73% nickel, Nichrome (heating elements) is 80%
nickel, Hastelloy (auto engine parts) is47% nickel.
I`m guessing that the boiling pot is most likely 410 stainless and it
passed my simple tests. Its magnetic,no rust,would not scratch.:-)
Bless you all Bob Lee
ps, sorry to be so slow,only 385 postings behind,was out of town again.
--
oozing on the muggy shore of the gulf coast
[email protected]
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