Abstract: The present invention provides iron-based infiltration methods for manufacturing powder metallurgy components, compositions prepared from those methods, and methods of designing those infiltration methods. Iron-based infiltration methods table include the steps of providing an iron-based infiltrant composed of a near eutectic liquidus composition of a first iron based alloy system and an iron-based base compact composed of a near eutectic solidus powder composition of a second iron based alloy system. The base compact is placed in contact with the infiltrant and heated to a process temperature above the melting point of the infiltrant to form a liquid component of the infiltrant. Lastly, the base compact is infiltrated with the liquid component of the infiltrant. During infiltration, the liquid component of the infiltrant flows into the pores of the base compact.

Abstract: The present invention provides a method of making metallurgical powder compositions and a method of using the metallurgical powder compositions produced. The method of the present invention includes providing a prealloy powder containing iron and one or more alloying additives that is preferably molybdenum, and admixing the iron-based prealloy powder with a copper containing powder having a weight average particle size of 60 microns or less, and a nickel containing powder having a weight average particle size of 20 microns. The mixture containing the iron-based prealloy powder, copper containing powder, and nickel containing powder is bonded in some manner to facilitate adhesion of the prealloy powder with the other alloying powders. Preferably, a binding agent is used to effect bonding. The metallurgical powder compositions thus produced have, for example, improved mechanical strength properties when formed into metal parts.

Abstract: An improved metallurgical powder composition comprising an iron-based powder and an alloying powder is provided. The composition contains a polyalkylene oxide having a number average molecular weight of at least about 7,000 as a binder. The binder of this invention permits the bonded powder composition to achieve compressibility equivalent to that of unbonded compositions and maintains resistance to dusting and segregation of the alloying powder.

Abstract: Methods for preparing metallurgical powders containing an organic lubricant are provided. The powders are prepared by wetting a dry admixture of an iron-based powder, at least one alloying powder, and a first organic lubricant with an organic binding agent that is preferably dissolved or dispersed in a solvent. After removal of the solvent, the dried powder composition is admixed with a second organic lubricant.

Abstract: An improved powder composition of an iron-based powder and an alloying powder is provided. Segregation and dusting of the alloying powder is eliminated or substantially reduced when the powder composition contains a polymeric binding agent which is an adherent film-former and which is insoluble in water.

Abstract: The invention involves a steel and the process of making it, which steel is especially adapted for welding at good productivity to produce a product well able to meet the special low temperature requirements for such purposes as ships for transporting liquified natural gas, without departing from normal steelmaking and rolling practices beyond ordinary normalizing. The steel for this and other reasonably similar purposes will have the following composition range:______________________________________ Percent Preferred Percent ______________________________________ Carbon 0.04 to 0.12 0.06 to 0.10 Manganese 0.30 to 0.90 0.65 to 0.85 Silicon 0.15 to 0.50 0.20 to 0.35 Nickel 0.15 to 0.50 Copper 0.15 to 0.40 Aluminum (acid soluble) 0.020 to 0.090 Aluminum (total) 0.025 to 0.100 Niobium (Columbium) 0.020 to 0.060 0.035 to 0.

Abstract: This is a process and product in which excellent properties are achieved with a relatively low alloy steel and normal rolling with a steel having the following composition in addition to iron and impurities, in percentages by weight:______________________________________ Carbon .05 to .12 Manganese .25 to .90 Silicon .15 to .50 Nickel .15 to .50 Copper .15 to .50 Aluminum .02 to .110 Niobium (Columbium) .07 to .140 Nitrogen .007 to .015 Phosphorus .010 maximum Sulfur .025 maximum.