P&S Means Plate and structural steel heres the spec from ISRI
231
Plate and structural steel, 5 feet and under.
Cut structural and plate scrap, 5 feet and under.
Clean open hearth steel plates, structural shapes,
"I aint your daddy I'm your zaydeh"
crop ends, shearings, or broken steel tires. Dimen
-
sions not less than
1
/
4
inch thickness, not over 5 feet
in length and 18 inches in width. Phosphorus or sul
-
phur not over 0.05 percent.
The basic ISRI specs date back to before ww2
A Brief History of Specs
Published specifications for recycled commodities have been around for almost 90 years.
The first scrap specifications were reportedly developed by the National Association of Waste Material Dealers (NAWMD). When this group was founded in 1913, the scrap industry was "chaotic" and "had no basic standards by which to operate," according to Scrap Age magazine. Thus, a main focus of the group's first meeting was "standardizing" the industry's commodities and "setting up trade customs." It wasn't until December 1919, however, that the association issued its first official Classification Number listing of scrap specifications.
Official specs for iron and steel scrap were reportedly promulgated in February 1926 by the U.S. Department of Commerce in cooperation with the Institute of Scrap Iron and Steel (ISIS) and other industry groups.
The oldest specs primarily dealt with metals and were conceived in an era when most long-distance business was transacted via teletype (meaning that messages were sent by telegram or "wire"). The longer the message or individual words in the message, the more expensive the transmission. To minimize transmission costs, the original scrap specs identified material with short numbers or words. "NAWMD gave each of its specifications a four- or five-letter code name, such as 'Berry' and 'Honey,' while ISIS used a three-digit number," notes Jim Wilkoff of S. Wilkoff & Sons Inc. (Cleveland) in a 1989 article on specifications.
In 1989, ISRI combined all of the specs created by the previous associations and published them in one book for the first time in the scrap industry's history. That book, called the Scrap Specifications Circular, has been through many iterations since then, with new editions published whenever new specs are added or old specs are deleted or modified.
ISRI's specs are now also posted online at the ISRI Web site (www.isri.org). The online version essentially makes the specifications a "living document" that can be updated more frequently than the printed circular.
Source: http://www.isri.org/news-publication...story-on-specs
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