Glossary |
Boiler and boiler tube industry terms and their definitions.
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| Scale | An oxide of iron which forms on the surface of hot steel. |
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| Seam | "A tight, but unwelded imperfection on the surface of a wrought metal product." |
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| Segregation | "Nonuniform distribution of alloying elements, impurities, or microphases." |
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| Semi-Killed Steel | "Steel that is incompletely deoxidized to permit the evolution of carbon monoxide, thereby offsetting solidification shrinkage." |
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| Sensitization | Sensitization of stainless steel is defined as a susceptibility of preferential grain boundary attack. Material which exhibits grain boundary carbide precipitation may or may not be sensitized. |
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| Soak | "To hold an ingot, slab, bloom, billet, or other piece of steel in a hot furnace, pit, or chamber to secure uniform temperature." |
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| Soaking Pit | A furnace or pit for the heating of ingots of steel to make their temperature uniform prior to rolling or forging. |
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| Soft Anneal | See heat treatment. |
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| Specification | "A document defining the measurements, tests, and other requirements to which a product must conform typically covering chemistry, mechanical properties, tolerances, finish, reports, marking, and packaging." |
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| Spheroidize Anneal | See heat treatment. |
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| Spinning | "A type of forming (hot or cold) which involves rotating a tube at high speed against fixed or rolling tools for the purpose of altering shape, size, etc." |
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| Stabilizing Anneal | See heat treatment. |
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| Stress Corrosion Cracking | "Cracking of metals under combined action of temperature, corrosion, and stress. The stress can be either applied or residual. Austenitic stainless steels are either applied or residual. Austenitic stainless steels are especially susceptible to cracking in chloride containing and some caustic environments." |
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| Stress Relief Anneal | See heat treatment. |
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| Strip | A flat-rolled steel product which serves as the raw material for welded tubing. |
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| Sunk or Sink Drawn | Tubing drawn through a die with no inside mandrel to control I.D. or wall thickness. |
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| Swaged | "A mechanical reduction of the cross sectional area of a metal, preformed hot or cold by forging, pressing, or hammering." |
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