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QUALITY BAR
17 Union Street, Building 7
Struthers, OH 44471
330-755-0000


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Grade: 4140
Diameter: 2.0"   ( 2" )

TURNED GROUND AND POLISHED TGP/TP COLD FINISHED BARS

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TURNED GROUND AND POLISHED:
Quality Bar sells 2" inch 4140 Turned, Ground and Polished Bars (TGP). When producing a 2" Turned, ground and polished (TGP) 4140 bars Quality Bar starts with a 1/16 of an inch or .0625 inch over diameter bar or a raw bar of 2.0625" diameter and turns (peels) and grinds off  .0625" resulting in a finished TGP bar of 2" inch. TGP stands for "Turned" which is processed in a turning machine (peeling machine), "Ground" which is processed in a grinder and "Polished" which is processed in a belt polisher. Using a polisher may have been the process about 10 years ago (before year 2000) but that no longer applies today. Today, commodity producers Turn (peel), post straighten, and grind or TSG. Few companies belt polish anymore unless specially requested.

Higher quality producers, such as Quality Bar, first pre-straighten before turning then post straighten and grind or STSG. Quality Bar can polish bars if requested. Polishing only helps to give a better finish. Polishing does not help the straightness or ovality of the bar. Turning a bar without pre-straightening requires using a rough turning machine which does not give as good of a quality as the fine turning machine in which Quality Bar uses.

TGP bars have a straightness of less than .020" over the full length of a 24 ft. long  bar and is it is not unusual for Quality Bar to consistently produced 2" inch 4140 TGP bars with a straightness of less than .010 over the full length of a 24 ft. long bar. When you buy a 2" inch 4140 TGP bar or TP bar from Quality Bar, you can be assured that you will be receiving one of the finest TGP bars produced in the industry.

CERTS:
When QB ships 2" inch 4140 Turned Ground and Polished (TGP) it includes with the bill of lading a copy of what is known as the "Cert". Cert is the chemical composition of the bundle of bars being shipped. Quality Bar receives the certs from the steel mill who produced the 2.0625" diameter raw bar and transfers the mill certs to its form reflecting the finished diameter of 2 inch. Many mills make 50 tons of a particular grade of steel at a time. The mill will use the 50 tons heat to make just one diameter and ship in 10,000 pound bundles. Quality Bar processes the steel and will normally make 2,000 pound bundles. All the bundles made from the 50 ton heat receive the same certs. All the 2,000 pound bundles Quality Bar makes from the same heat have the same certs.

this is for diameter 2 and grade 4140