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  CAPABILITIES INDUSTRIES QUALITY NEWS INFORMATION ABOUT
 

 

  QUALITY - CHEMICAL TESTING  
 

Southwest Steel Casting Company achieved certification to ISO-9002 on December 26, 1996. In so doing, SWS becomes only the second foundry in Texas to distinguish itself in this manner.

 
 
 
 

Most customers require specific metallurgical properties for their castings. Typically, one of the metallurgical properties specified is the chemical composition of the steel . Chemical analysis is required to ascertain the chemical composition of a heat of steel. Chemical testing at Southwest Steel is done with an Optical Emission Spectrometry. Also, when required, Southwest Steel can provide material certification to a specified standard.

Southwest Steel Casting Company is, as are most foundries, a principal recycler of scrap metals. Scrap metal is sorted by its known chemical properties when it arrives at Southwest Steel. When a ‘heat’ is required with specific chemical requirements, the scrap charge for the arc furnace is made up of these presorted metals.

Once the scrap has been melted in the arc furnace, a sample is drawn and sent to the Metallurgical Lab for chemical analysis. Once the metallurgical properties of the sample are determined, a ‘recipe’ can be formulated to bring the ‘heat’ in the arc furnace to a particular chemical specification. This is typically done by adding various alloys to the furnace.

At least two more times during the melting and pouring process, samples are analyzed to verify the steel’s chemical composition. The final test being done as the heat is being poured. This is the sample that will be the basis of certification that is sent to the customer.

Optical Emission Spectrometry
Optical Emission Spectrometry (OES) using arc and spark excitation is the preferred method to determine the chemical composition of metallic samples. This process is widely used in the metal making industries, including primary producers, foundries, die casters and manufacturing.

Due to its rapid analysis time and inherent accuracy, Arc/Spark OES systems are most effective in controlling the processing of alloys. These spectrometers are used in the quality control of metal processing where a chemical composition of the metallic material is required.

Analysis...

 

 
   
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