Glossary |
Boiler and boiler tube industry terms and their definitions.
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| Eccentricity | The displacement of the I.D. of the tube with respect to its O.D. Eccentricity results in the variation of wall thickness normal to seamless tubing. |
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| Eddy Current | Non-destructive testing method using eddy current flow for the purpose of recognizing a discontinuity in the piece being tested. |
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| Elastic Limit | A measure of the maximum stress that may be applied to a tube without leaving a permanent deformation or strain after the stress is released. |
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| Electric Furnace Process | "One of the common methods used for melting and refining stainless and some alloy steels. It involves the use of electric power as the sole source of heat, thereby preventing contamination of the steel by impurities in the fuel as in other melting processes." |
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| Electric Resistance Welded Tubing | "Tubing made from strip, sheet, or bands by electric resistance heating and pressure, the strip being part of the electrical circuit. The electric current, which may be introduced into the strip through electrodes or by induction, generates the welding heat through the electrical resistance of the strip." |
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| Electric Resistance Welded Tubing | Special Smooth I.D.- A cold drawn tube in which special attention is paid to the internal surface. Depth of pits and scores in I.D. are guaranteed to be below published maximum depths. Microinch finish is guaranteed in ERW tubes. |
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| Electric Resistance Welded Tubing - As Drawn | "As Drawn tubing is unheat-treated, cold drawn tubing and has a scale free cold drawn surface." |
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| Electric Resistance Welded Tubing - As Welded Cold Rolled | As Welded Cold Rolled- ERW tubing exhibiting the surface of cold rolled strip. |
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| Electric Resistance Welded Tubing - As Welded Hot Rolled | As Welded Hot Rolled- ERW tubing exhibiting the pickled or shot blasted surface of hot rolled strip. |
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| Electric Resistance Welded Tubing - Bright Annealed | Bright Annealed- Welded tubing normalized in a controlled atmosphere furnace and which exhibits a bright surface. |
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| Electric Resistance Welded Tubing - Flash In | "Flash-In tubing us welded tubing which still retains the I.D. bead or flash formed during the welding operation. It can be furnished in either the as-welded, sunk, or heat-treated condition." |
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| Electric Resistance Welded Tubing - Flash Removed | "Flash-Removed- Welded tubing from which the I.D. flash formed during the welding operation has been removed by some mechanical method. It can be furnished in either the as-welded, sunk, or heat-treated condition." |
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| Electric Resistance Welded Tubing - Gun Metal | "Gun Metal Finish- Welded tubing normalized, annealed, or stress relieved in a controlled atmosphere furnace which exhibits a gun metal finish." |
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| Electric Resistance Welded Tubing - Pickled | Pickled tubing has had the scale from hot fabrication or heat treatment removed by one of several types of acid solutions. |
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| Elongation | "The amount of permanent stretch, usually referring to a measurement of a specimen after fracture in a tensile test. It is expressed as a percentage of the original gage length." |
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| Endurance Limit | The maximum stress below which a material can presumably endure an infinite number of stress cycles. |
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| Etch Test | "Exposure of a specimen to acid attack for the purpose of disclosing the presence to foreign matter, defects, segregation pattern, or flow lines." |
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| Extrusion | Production process in which steel is forced by compression through a die into solids (round or special shape) or through a die and over a mandrel to form a tubular shape. |
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