TG&P
Turned, Ground, and Polished (TGP) is a finishing processes often used for metal shafting.
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TG&P (Turned, Ground, and Polished)
Turned, Ground, and Polished (TGP) is a finishing processes often used for metal shafting. Turning (on a lathe) creates straight round bars without the strain induced by cold drawing, while grinding and polishing improves the surface finish and roundness for high dimensional accuracy. Extreme straightness is critical in high-speed applications to prevent vibration and reduce wear on bearings. Coastal Metals is the premier metal supplier for California, providing precision crafted metals.
We carry the following TG&P Metals:
4140 TG&P UP TO 6″ DIA
The metal is quench & tempered, stress relieved, machine straightened and turned ground & polished. Coastal Metals stocks this grade and others. 4140 TG&P is widely used as an alternative to carbon steel where strength and fatigue are a concern. It is a general-purpose alloy used where substantial strength, toughness, and hardness are required. Through tempering, quenching and the cold finishing process, the result is improved strength and ductility, improved toughness, better fatigue resistance, and superior surface condition.
Element | Composition % |
Carbon | 0.38 – 0.43% |
Silicone | 0.15 – 0.30% |
Manganese | 0.75 – 1.00% |
Chromium | 0.80 – 1.10% |
Molybdenum | 0.15 – 0.25% |
1045 TG&P UP TO 6” DIA
This metal has a higher carbon content which gives it increased strength over low carbon steels. Turned, Ground and Polished Shafting is produced by turning instead of cold drawing the stock down to its nominal size. Since the internal stresses set up in the cold drawing process is avoided, the possibility of warping and distortion is minimized using this process. Grinding and polishing provides a finished size of greater accuracy and surface smoothness. Response to heat treatment is excellent and the mechanical properties permit a wide usage in the production of machinery parts and shafts. 1045 can be hammer forged, machinability is good, but forming and welding qualities are limited.
Element | Composition % |
Carbon | 0.42 – 0.50% |
Manganese | 0.60 – 0.90% |
Phosphorus | 0.04% |
Sulfur | 0.05% |
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