Electric Comet writes:
On Wed, 15 Apr 2015 16:25:55 GMT
(Scott Lurndal) wrote:

If a handsaw blade hasn't rusted, it's been treated well.

or made in low O2 environment or lots of other possibilities since
steel making is complicated and the issue is more complicated when
you throw in something made long ago where the technique was only
know by few people including the alloy's composition
i.e. did they add special ingredients

It's difficult to comprehend the sense of long run-on sentences.

It would help you to convey your information more successfully
if you were to use basic grammar, capitalization and sentence structure
when formulating your pronouncements.

It appears that you're suggesting that the formulation of steel used
for cutting tools in the 20th century was some sort of mystery, which
is pretty far from reality.

As Leon pointed out, even stainless can show corrosion effects.