The Grey Chronicles

2008.August.28

1995-1999 NSC Material Yield


NSC Material Yield is a function of input and output weights of materials processed in various mills. Respective material yields are also computed per processed coil for each processing line, but for the Quality Assurance department’s monthly report, Material Yield is computed by comparing the HRC weight from Pickling Line No. 2 versus the output weight of the finished product—full hard or annealed coils (see Appendix C).


Material Yield)

Figure 33: NSC CRC Material Yield vs. Production, 1995-1999 (Data: NSC)

The Material Yield is computed from the input weight less the off-gauge head-end and tail-end scraps; squaring-off prior to welding the coil ends, and side-trimmings at Pickling Lines and Coil Preparation Lines. Low Material Yields were occasionally experienced because of severe material damage during handling and storage; telescopicity beyond customers’ specifications; or in the event of loose coiling, which would lead to total or partial collapse of coils.

Actual Material Yield, in percent, Figure 33, lingered at 90% from January 1995 to December 1996, usually higher than the standard yield for each month. Data shows a moderate correlation between monthly NSC production and monthly Material Yield.

From January 1997 to until NSC closed, however, actual Material Yield tended to go above the standard set for each month. The shift was evident at the start of 1997 after the Quality Assurance department, as mandated by top management, revised the manner of setting material yield standards based on previous campaigns instead of using variance standards “anchored on theoretical computations” (Que Estevez, 1997).


Notes:

Que Estevez, Wilkie C.Jr. (1997), “Derivation of Cold Mill Material & Prime Yield Standards,” Internal Memo. Iligan: Quality Assurance, Cold Strip Mill, NSC. 01 April 1997. back to text

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2 Comments »

  1. There is obviously a lot to learn about this. There were some pretty good points.

    Comment by Celine Wig — 2010.April.25 @ 20:36 | Reply


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