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| >> GLOSSARY OF TERMS |
| P |
| PACK ROLLING Rolling two or more pieces of thin sheet at the same time, a method usually practiced in rolling sheet into thin foil. |
| PASS A term indicating the process of passing metal through a rolling mill. |
| PATENT LEVELING (See Stretcher Leveling.) |
| PATENTING Treatment of steel, usually in wire form, in which the metal is gradually heated to about 1830?F., with subsequent cooling, usually in air, in a bath of molten lead, or in a fused salt mixture held between 800?F. and 1050?F. |
| PATTERNED OR EMBOSSED SHEET A sheet product on which a raised or indented pattern has been impressed on either one or both surfaces by the use of rolls. |
| PEARLITE Lamellar structure resembling mother of pearl. A compound of iron and carbon occurring in steel as a result of the transformation of austenite into aggregations of ferrite and iron carbide. |
| PERMALLOY Nickel alloys containing about 20 to 60% Fe, used for their high magnetic permeability and electrical resistivity. |
| PERMANENT SET Non-elastic or plastic, deformation of metal under stress, after passing the elastic limit. |
| PHOSPHOR BRONZE Copper base alloys, with 3.5 to 10% of tin, to which has been added in the molten state phosphorous in varying amounts of less than 1% for deoxidizing and strengthening purposes. Because of excellent toughness, strength, fine grain, resistance to fatigue and wear, and chemical resistance, these alloys find general use as springs and in making fittings. It has corrosion resisting properties comparable to copper. |
| PHOSPHOR BRONZE STRIP A copper-base alloy containing up to 10% tin, which has been deoxidized with phosphorous in varying amounts of less than 1% (see Phosphor Bronze). Temper is imparted by cold rolling, resulting in greater tensile strength and hardness than in most copper-base alloys or either of its alloying elements copper or tin. The various tempers from "One Number Hard" to "Ten Numbers Hard" are classified in hardness by the number of B & S Gages reduction in dimension from the previous soft or as annealed state (See Brown & Sharpe Gages). Phosphor Bronze is not heat treatable for purposes of hardness development. It does not withstand elevated temperatures very well and should not be used in service above 225?F. even after stress relieving treatment at 325? to 350 ?F. It has excellent electrical properties, corrosion resistant comparable to copper; great toughness and resistance to fatigue. Rated good for soft soldering, silver alloy brazing, oxyacetylene, carbon arc and resistance welding. |
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