Klarinet Archive - Posting 000094.txt from 1997/09
From: "Brian Ackerman" <ackerman@-----.uk>
Subj: Re: Springing the blues
Date: Tue, 2 Sep 1997 20:55:10 -0400
Sorry Jerry, but you are wrong and Leo is right. It has everything to do
with spring hardness. I answered this in a posting a few days ago.
The spring needs to be first hardened and then tempered. The tempering at
about 320deg C. produces a blue oxide film.
Incidentally, I think Boehm was the first to use needle-springs on his
flutes. He recommended "best quality English sewing needles".
Jerry Korten wrote:-
> Actually, from what I understand, the blueing process protects the metal
> rusting due to atmospheric moisture. It has nothing to do with spring
> or hardness.
> The hardness is achieved by tempering the steel (a heating and cooling
> process that affects the crystalline structure of the metal).
> The blueing process is a surface oxidation that prevents regular rust.
> are other methods that work as well, such as gold plating as Leblanc
> Jerry Korten
> In a message dated 97-08-31 06:03:47 EDT, Leo writes:
> >Blue steel, as in blue steel springs, is steel that has been treated
> >either hot or cold bluing. The same stuff they use on guns to help
> >rusting. It is only a finish.
> It is not only a finish. The methode of hardening the spring be the cause
> hardening the surface, and
> leave the core tough. The reson is that the spring has the elasticity of
> full hardend spring, but the
> toughness of a unhardend spring. In other words, it wil not break as
> a hardend spring, and it wil
> not bend as easy as a unhardend spring.
> Leo (the spelling crack) van Zantvoort