Alloys or metallic compositions – Ferrous – Nine percent or more chromium containing
Reexamination Certificate
2001-11-28
2004-02-10
Yee, Deborah (Department: 1742)
Alloys or metallic compositions
Ferrous
Nine percent or more chromium containing
C420S060000, C420S061000, C420S104000, C420S106000, C420S121000, C148S325000, C148S330000, C148S332000
Reexamination Certificate
active
06689312
ABSTRACT:
BACKGROUND OF THE INVENTION
The manufacture of glass containers such as bottles, jars, and the like involves the shaping of the molten glass in a mold assembly, which consists of metallic components. The mold assembly is operated on an automatic machine they can produce glass bottles and jars at high production rates. Molten glass is dropped into a mold assembly at a temperature of about 1200 degrees Centigrade and is formed into a shape by the action of different components. Traditionally the mold is made of gray cast iron or bronze, and the internal components are made of a variety of steels, cast irons or nickel alloys.
The conditions inside glass container manufacturing apparatus are severe. There are frequent and severe temperature changes as the molten glass is introduced then ejected as a partly formed bottle in every machine cycle. Machine cycles can be a short as a few seconds. The components of the container manufacturing apparatus must be able to resist this thermal cycling without cracking.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an alloy, having particular application to glass making apparatus such as molds and plungers for glass container manufacturing that can be made by standard melting and molding techniques used in ferrous foundry operations.
Another object of the invention is to provide an alloy that has a high hardness in the as cast condition and preferably as high as 55 Rockwell C.
Still another object of the invention is to provide an alloy that (a) can be heat treated to allow for machining operations to be carried out and (b) can re-hardened thereafter for service by standard normalizing and tempering procedures.
Yet another object of the invention is to provide glass making machinery components that have excellent service lives when employed as parts of glass bottle manufacturing apparatus and maintain sharp edges on surfaces in contact with molten glass longer than traditional materials.
Still another object invention is to provide apparatus that is capable of a substantial service life despite the severe and very frequent temperature cycling encountered within glass container manufacturing apparatus.
Is now been found that these and other objects of the invention may be attained in an alloy or an article of manufacture including but not limited to plunger and mold articles used in glass container manufacturing which consists of
(a) carbon 0.1 to 0.5% by weight;
(b) silicon 0 to 2% by weight;
(c) manganese 0 to 2% by weight;
(d) sulphur 0.02 to 0.05% by weight;
(e) phosphorus 0.02 to 0.05% by weight;
(f) nickel 0 to 3% by weight;
(g) chromium 5 to 35% by weight;
(h) molybdenum 0 to 5% by weight;
(i) copper 0 to 3% by weight;
(j) boron 0.5 to 3.5% preferably 1.8 to 2.2%
(h) The balance of the composition is iron.
In some embodiments of the invention the component (i) copper is in the range 0.2 to 1% by weight; the component (a) carbon is in the range 0.2 to 0.3% by weight; the component (b) silicon is in the range 0.5 to 1.5% by weight and the component (c) manganese is in the range 0.4 to 1.5% of weight.
The component (f) nickel may be in the range 1.0 to 1.5% by weight; the component (g) chromium may be in the range 15 to 20% by weight; and the component (h) molybdenum is in the range 0.1 to 0.3% by weight. The component (j) boron may be in the range 1.8 to 2.2% by weight.
REFERENCES:
patent: 3798075 (1974-03-01), Bendel
patent: 5089067 (1992-02-01), Schumacher
patent: 5641453 (1997-06-01), Hackl et al.
patent: 5820819 (1998-10-01), Tanabe et al.
patent: 5964915 (1999-10-01), Neuman et al.
patent: 6110300 (2000-08-01), Brada et al.
SG Alternatives, L.L.C.
Smith Robert S.
Yee Deborah
LandOfFree
Alloy composition and improvements in mold components used... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Alloy composition and improvements in mold components used..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alloy composition and improvements in mold components used... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3345090