Thread: TIs with Sheffield Steel?

Originally Posted by Neil Miller

...Why lead? Because it holds and transfers the heat very evenly, not because it is inherently superior to any other process. The blanks are then annealed and ground....

Good eye Neil.

Considering the effects of lead on the human nervous system it has it's dangers too. Aside from the heat transfer you mentioned, it also provides an oxygen barrier to the surface of the blade. Heating a blade in an open air environment, whether a fire or an electric kiln, allows oxygen to bind to some of the surface carbon in the steel and create a layer of iron oxide (scale) that has to be removed after heat treatment. A liquid, like molten lead, does not produce this effect, except a little color change. The blade can be manufactured to a near-finished state with less superficial material requiring removal during the critical grinding/polishing after the heat treatment is done. Having to remove more material at that point risks heating the blade to where the heat treatment is useless.

The lead mass represents a huge heat sink. The advantage here is that the lead, once at temperature, does not fluctuate above or below the set point to the same degree that an open fire would, nor the opening and closing of a kiln door. Having to watch a blade come up to temperature and not overshoot takes skills and you can't do batches of blades all at once. The Dovo video illustrates this very well. Opening a kiln door loses heat and you have to wait for everything to come back up to temperature. All that time allows for surface oxides and more finishing time later.

Simply put, it reduces wasted time and materials from a factory perspective.

TI has always used Sheffield steel, same as now. It's the only steel they use.

They require a very specific alloy which they can only buy from a specific manufacturer.
They piggy-back their orders on the orders of an industrial consumer which uses the same steel. The amounts they buy are otherwise not large enough for the steel mill to bother with at a reasonable price.

While lead is indeed the ideal medium for heat transfer, personally I wouldn't want to be near the baths. I like my nervous system the way it is

They did a big marketing when they switched their steel few years ago, and even to this day they continue it (Silverwing LE, another Silverwing, then another round of heat treatment improvements...). Currently all of their production is made from the same alloy they call c135, or sometimes carbonsong.
I have no idea if the steel is now made in Sheffield or not, but it definitely isn't like their previous steels or the other vintage brands from Sheffield. So, if you want the old Sheffield feel get an old razor, if you want the new steel feel get a new TI.

They came out with the C-135 for the Silverwings and announced that they were going to the same steel in all of their production henceforth. Before they settled on the C-135 they had at least one, if not more, experimental steels. I recall Tony Miller had one of the prototypes and it was so marked. I never got to try one of those but I have quite a few of the older TIs as well as a few of the current stuff. I haven't found a TI I do not like yet. I guess it is like having an ear for music, or not, but I don't feel a difference between the two steels in shaving with both. Honing might be a bit tougher on the new stuff, but not terribly so.

Tat lead won't hut yuu. I have beeeen etin' lead paint fur yers..no eeeeeeeeeeeeefffacts hab bbean noticced...

Originally Posted by Wintchase

Tat lead won't hut yuu. I have beeeen etin' lead paint fur yers..no eeeeeeeeeeeeefffacts hab bbean noticced...

Didn't do Lead Belly any harm...



Regards,
Neil

Originally Posted by Wintchase

Tat lead won't hut yuu. I have beeeen etin' lead paint fur yers..no eeeeeeeeeeeeefffacts hab bbean noticced...

In my younger days I cast one hell of a lot of Lyman 429421, among many others. A lot of times in a Lyman bottom pour pot sitting on the kitchen table. Still here but the brain damage is obvious.

I recently saw something on T.V about Sheffield, England and from what I could see it seems to be a pretty depressed area. All the traditional industries are gone. I wonder if they do any metal work there anymore.