So-called " does not rust iron " , is will recovery of scrap metal , and lead , and steel , by second times melted down processing , by de " AIDS " processing and into , traditional of detection method is with magnet , and this products with traditional method is cannot distinguished of , natural is try to deceive everybody , covered has many of engineering selection , therefore Grand to entered has a and a decoration site , boarded has a site and a site Deluxe curtain wall . This name is the focus of the interview after the exposure of the birth, and occupies a market share of about 65%, but the real standard of SUS304 stainless steel products due to higher prices and no market.