Abstract: A method of treating molten carbon-containing iron to produce a cast iron with a compacted graphite structure comprising adding to the molten iron in a single step a quantity of an alloy containing silicon, magnesium, titanium, calcium and a rare earth, the balance being iron. Preferably, the alloy has the following nominal composition by weight:30 to 80% Silicon,2 to 15% Magnesium,3 to 25% Titanium,2 to 10% Calcium,0.05 to 1.0% Cerium andThe Balance Iron.

Abstract: In a method of forming foundry sand moulds employing a cold-setting sand mixture pressed around a pattern by the use of pneumatic pressure acting on a flexible diaphragm, the sand is formed into a horizontal layer of approximately uniform thickness in a frame of which the bottom wall is formed by the diaphragm, the pattern is then pressed into that layer of sand, causing the diaphragm to bulge downwards, then the gas pressure (conveniently air pressure) is applied to compact the sand, which thereupon sets to allow separation of the resultant mould body from the diaphragm and pattern. During the initial formation of the layer the diaphragm can be supported by a further, stronger diaphragm, which is perforated to allow the gas pressure through, or by a rigid pad, or both.

Abstract: A method of treating molten carbon-containing iron to produce a cast iron with a compacted graphite structure comprising adding to the molten iron in a single step a quantity of an alloy containing silicon, magnesium, titanium and a rare earth, the balance being iron. Preferably, the alloy has the following nominal composition by weight silicon 30-80%, magnesium 3-15%, titanium 3-25%, cerium 0.05-1.0% and the balance iron.

Abstract: In an iron molding process and in a mold for carrying out the process, in which the mold is at least locally coated with tellurium or bismuth to promote the production of a white iron structure there is included in the coating a mineral substance such as a clay containing water which is loosely chemically combined, or a substance containing hydroxyl groups, the water or each hydroxyl group being chemically combined tightly enough so that it withstands the heat involved in drying of the mold but is liberated on contact with the molten iron.

Abstract: A composition for making foundry moulds and cores of improved strength comprises a mixture of a granular refractory material, a sodium silicate binder and a polymeric resin material. The polymeric resin material is formed by heating together phenol, a carbohydrate and formaldehyde in the presence of a catalyst.

Abstract: In foundry core-making or mold-making apparatus employing a rotary mixer working in a chamber and mixing together a sand-resin mix and a sand-catalyst mix to produce a cold quick-setting mixture that is then quickly discharged through the bottom of the chamber into a core-blower or molding machine, the chamber is fixed and has two separately movable sliding shutters controlling openings in its floor (it may be one long opening), one shutter controlling discharge into the blower or molding machine and the other controlling discharge of any residue to a waste chute. Preferably the first shutter uncovers a peripheral portion of the floor first, the discharge area thus growing from the periphery in a radial inward direction.