| GLOSSARY OF USUAL STEEL TERMINOLOGY |
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| API |
American Petroleum Institute – issues standards for all industry |
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| ASTM |
American Society for Testing Materials – issues standards for line pipe |
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| A53A, A53B, A53F, A106 |
ASTM grades of carbon steel pipe |
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| Black pipe |
Denotes lacquered OD finish (as opposed to bare or galvanized) |
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| Brinell |
Hardness testing system which measures indentation of the surface using a standard weight, shaped point |
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| Burst |
Internal pressure at which a tube will yield – often tested hydrostatically |
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| Cold drawn |
Pipe or tubing which is pulled through a die to reduce diameter and wall. This process usually produces close tolerances and higher strength. |
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| Drift |
Minimum ID clearance verified by pulling a mandrel size through a length of pipe |
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| EMI |
Electromagnetic inspection – a method of determining thickness and detecting imperfections in steel tubes. |
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| ERW |
Electric resistance weld–most common form of mandrel for pipe in sizes from 2 3/8–22” OD |
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| Nominal |
Pipe size or wall thickness as specified (not actual) refer to approximate ID, even though OD is the fixed dimension |
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| Rockwell hardness |
Relative resistance of a metal to indenation by a dimond expressed in hardness scale units (A, B, C or G) |
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| SAW |
Submerged are weld – a method of producing very large pipe |
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| Skelp |
Colled strips of plate steel used to produce welded |
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| Tensile strength |
Rating of steel’s resistance to being pulled apart. |
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| Tolerance |
Specified allowance (plus or minus) of the given dimension finished product due to inaccuracies in manufacturing; usually small (thousands of an inch or very small percentage) an part of a standard such as ASTM or API. |
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| Yield strength |
Tensile stress required to produce permanent elongation of a steel tube. |
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