不銹鋼廢料304

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  • 不銹鋼廢料304

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不銹鋼廢料304
Sources of steel scrap
The iron and steel industry recycles three types of scrap: "home", "new", and "old" scrap.

Home Scrap
Home scrap is internally generated in the steel production process when steel mills and foundries manufacture new steel products.
This form of scrap rarely leaves the steel-making production area.
Instead, it is returned to the furnace on site and melted again.
Technological advancements have significantly reduced the generation of home scrap which accounts for approximately29% of total scrap.

New Scrap
New scrap is generated during initial manufacturing processes. It is recycled onsite or sent directly to a steel works. The composition of new scrap is well known and in principle new scrap does not need any pre-treatment process before it is remelted, although cutting to size might be necessary.

New scrap (also called prompt or industrial scrap) is generated in steel-product manufacturing plants and includes such items as turnings, clippings and stampings leftover when a part is made during manufacturing processes.  
This material is typically sold to the scrap metal industry that processes it for sale to steel mills and foundries.  
It accounts for approximately23% of total steel scrap.

Old Scrap
Old scrap is collected after a consumer cycle, either separately or mixed, and it is often contaminated to a certain degree, depending highly on its origin and collection systems. Since the life time of many metal products can be more than ten years and sometimes more than 50 years, for instance products for building and construction, there is an accumulation of metal in use since the beginning of the industry.
Old or post-consumer scrap results when industrial and consumer steel products (such as, automobiles, appliances, buildings, bridges, ships, cans, railroad cars, etc.) have served their useful life.
Old or post-consumer scrap accounts for approximately48% of total scrap.

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